WorkZone 2018

We are closing in on the next WorkZone release. In a week we will host the annual customer seminar. It is time for an update of what to expect for the OData part of the WorkZone product suite.

As we haven’t finalized the release yet, there could be changes in the final release compared to information given here.

  1. The QueryBuilder (delivered as part of our OData provider) has been thru a major UI refresh. We now include more user friendly labels for the system names making it easier to find what you are looking for in our rather big model. Information about data types and lengths are provided as placeholder texts on input fields. Results can be paged (we now have a Next button). The results are now placed in a more readable table structure with inlined expanded data. A new color scheme has been applied making it easier to distinguish between single (blue) and multi (yellow) navigation properties. Columns can be resized and reordered. Links are included on ID properties of selected entity types enabling you to directly open WorkZone Client and show the selected Case, Document or Contact. Document contents are likewise directly accessible from a link on the SuggestedFileName of the Document entity. Queries can be stored and reused in WorkZone Client,  WorkZone Explorer and WorkZone Mobile. Saved OData QueryBuilder queries can now be reopened and edited directly in QueryBuilder or from WorkZone Client. The reference model documentation available from within our QueryBuilder now opens faster, looks prettier and automatically navigates to the entity chosen in the QueryBuilder. Happy 2018 QueryBuild’ing.
  2. I have submitted a couple of changes to Microsoft’s OData client framework that they included in their WCF Data Service Client release 5.8.2 and onwards. The most interesting one is the ability to have the WCF Data Services (OData) Client framework to handle null propagation check automatically. By setting DataServiceContext.AutoNullPropagation = true, you can now avoid doing explicit null checks in your C# linq select expression. The other submitted changes relates to fixing various performance issues in the WCF DS Client. The updated Microsoft framework can also be used (with the same benefits) together with earlier versions of WorkZone.
  3. We now support CORS on our OData service (requires configuration of allowed origins). By configuring this you would be able to securely fetch WorkZone data from other origins – like a SharePoint Intranet Portal.
  4. SaveChanges: $batch support for independent updates (SaveChangesOptions.BatchWithIndependentUpdates). This will submit multiple creates, updates, deletes and gets in a single batch’ed request, but instructing the server to treat these as individual transactions.
  5. Support for OData date functions year(), month() and day() functions as part of a filter expression enabling you to do queries like $filter=month(Created) eq 12 for finding entries that were created in a December month regardless of the year.
  6. The Custom Property feature we included in the 2017 release has been simplified on the OData part. Custom Properties are now exposed as _Value and _Summary properties directly on the entity where they belong. You no longer have to expand your way to get to their values. This change is backwards compatible – if you have existing code that reference and manipulate them the “old” way – it will still work as always.
  7. All UserKey, Summary and _Summary properties can now be used in the $filter part of a query.
  8. The service is now more immune to model changes in save operations.
  9. We have removed around 2000 redundant properties from our OData metadata model. We had some redundancy in our properties (like – there were multiple navigation paths to get from a Record to its File or Summary properties that would never have any contents), these redundant and always null properties are now removed from the metadata model. The OData server backend still knows about them so any existing javascript and .net based client code should run just fine without needing to change anything. If you at some point decide to update an existing .net proxy/service reference you could experience compiler errors if your code is referencing one of the now removed redundant properties, you can either fix these errors in your code rewriting it to use the preferred property instead, our you can use our new /OData/2017/ endpoint that is identical to the standard endpoint except that all properties are still available in the metadata model. The good part of this change is that it now should be a lot easier to find what you are looking for in the model. Reverted. See 17.
  10. Performance of expand a collection/multi property has been optimized. Prior to WorkZone 2018 a separate query was generated for each main entry per collection/multi expand path. In WorkZone 2018 a single query is generated on the server selecting everything at once. Our test case shows a performance gain of more than a factor 60 in these cases (the actual number depends on the actual query and data present).
  11. Single character wildcard ‘?‘ can now be used as search criteria on non free text based properties.
  12. Support getting an entity prefilled with default values returned from server. You can trigger this in a query by doing $top=-1.
  13. Advanced: You can now disable 2 automatic performance optimizations from an OData client: Disable Oracle Hints and Disable Inline Select (of expanded collections/multis).
  14. A new custom header FixedPageSize can be set to true to prevent the server to increase the page size for each page request and $skiptoken.
  15. A new demo showcase application (unsupported beta client) is included called Flex. It is a simple html5 application showcasing how a full functional but very simple client build on OData could look. Find it on your workzone host at http(s)://[HOST]/OData/Flex/
  16. Last but not least – good news for our OData Service… WorkZone Client and WorkZone PDF have now adopted OData completely. They now runs on the best standard data http protocol – OData. Welcome to both of them.
  17. We include a new OData endpoint V3 (found at http(s)://[host]/OData/V3/). The QueryBuilder will default to this endpoint. The V3 endpoint removes around 2000 redundant properties from our OData metadata model. We had some redundancy in our properties (like – there were multiple navigation paths to get from a Record to its File and Summary properties that would never have any contents). These redundant or always null properties are now removed from the metadata model at the V3 endpoint. We recommend that all new code targets this new V3 endpoint. We encourage existing code be rewritten to target the new V3 endpoint. The good part of the V3 endpoint is that it should be a lot easier to find what you are looking for in our rather large model.

DataServiceContext – Roundup

We have a number of posts with tips and tricks for setting different properties and event handlers to accomplish different optimizations, logging requirements etc. Her you will find a small code snippet with all these combined during DataServiceContext construction. For this I utilize the fact that the DataServiceContext (or the ODataService as it is called in your WorkZone proxy) is a partial class.

// As this class is partial it must be placed in the same namespace as the rest of the specification in your proxy
public partial class ODataService
{
    public ODataService() : this((ICredentials)null)
    { }

    public ODataService(ICredentials credentials) : this(new Uri("http://host/OData/"))
    {
        if (credentials == null)
            credentials = CredentialCache.DefaultCredentials;
        Credentials = credentials;
        Format.UseJson();
    }

    public string UseLogApplication { get; set; }
    public string UseLogWindow { get; set; }
    public string UseLogIdentity { get; set; }
    public string OnBehalfOfUser { get; set; }
    public bool AcceptCompression { get; set; }

    partial void OnContextCreated()
    {
        IgnoreMissingProperties = true;
        AcceptCompression = true;
        UseLogApplication = "MyDemoProject";
        SendingRequest2 += (sender, args) =>
            {
                if (!args.IsBatchPart)
                {
                    ApplyRequestHeaders(((HttpWebRequestMessage)args.RequestMessage).HttpWebRequest);
                }
            };
    }

    public void ApplyRequestHeaders(HttpWebRequest request)
    {
        if (!string.IsNullOrEmpty(UseLogApplication))
            request.Headers["UseLog-Application"] = UseLogApplication;
        if (!string.IsNullOrEmpty(UseLogWindow))
            request.Headers["UseLog-Window"] = UseLogWindow;
        if (!string.IsNullOrEmpty(UseLogIdentity))
            request.Headers["UseLog-Identity"] = UseLogIdentity;
        if (!string.IsNullOrEmpty(OnBehalfOfUser))
            request.Headers["OnBehalfOf"] = string.Concat("User=", OnBehalfOfUser);
        if (AcceptCompression)
            request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
    }
}

Immunity to model changes – IgnoreMissingProperties

As our OData model is generated automatically runtime to include all the available entities and properties including all customizations and modules (products) you can run into issues where the model on the server get misaligned with the model in your client side proxy (generated from Add Service Reference). This can happen in the following situations…

  1. You generate the proxy against one WorkZone installation and run your code against another installation and the two installations are not identical (in terms of the underlying database).
  2. You upgrade from one version of WorkZone Content Server to a newer release and the new release has additions to the underlying database.
  3. You install a new WorkZone  module or product that includes changes to the model.

If one of the above cases is true you could run into a problem during querying because the server is sending some new property that does not exist in your proxy because the proxy was generated at a point where the property did not exist. This issue manifests itself as an InvalidOperationException during object materialization stating “The closed type [X] does not have a corresponding [Y] settable property”.

To remedy this you could simply perform an “Update Service Reference” and recompile your code, but you can also make your code more immune to this situation by simply telling the DataServiceContext to ignore such properties that are not present in the proxy, like this…

context.IgnoreMissingProperties = true;

We recommend that you always set the IgnoreMissingProperties to true. Apart from this we also highly recommend that you always include a projection for your results – this primarily for performance reasons, but it will also circumvent the materialization problem with server model changes.

Minimize payload by switching to JSON format

The OData V3 protocol is two faced. It has a XML/ATOM based representation as well as a JSON based representation. The JSON format is roughly 4 times lighter than the ATOM format. The default format used by WCF Data Service Client (for OData V3) is ATOM, we highly recommend that you switch to the JSON format. The format to use is specified on the DataServiceContext by simply calling…

context.Format.UseJson();

Use HTTP compression to minimize the payload

In cases where the network bandwidth is a bottleneck you can benefit from enabling dynamic compression on the OData service. Enabling compression on the service is setup in the IIS manager, you can follow the directions here: , or you can ask our service technicians to do it for you. Once the service is correctly set up for dynamic compression you need to request compressed content when you send requests to the OData service. This is simply accomplished by a single line in a SendingRequest2 event handler on the DataServiceContext like this…

context.SendingRequest2 += (sender, args) =>
    {
        if (!arg.IsBatchPart)
        {
            // Tell the OData server that you accept compressed content. You can do this even if the server has not been set up for dynamic compression, the server will just send uncompressed content.
            ((HttpWebRequestMessage)args.RequestMessage).HttpWebRequest.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
        }
    };

Logging

The WorkZone system has build in logging of user access to the primary entities File, Record and Contact. The logging feature logs both the user and the entities that the user has accessed as well as some additional information regarding the origin of the access like the name of the integration system that issued the request. We kindly ask you to always send this extra information when you write code against our OData service.

The DataServiceContext will automatically fire the event SendingRequest2 whenever it issues a request to the server. You can write an event handler for this event to ensure that the extended logging information is always included in all requests.

The following code snippet show how this can be done.

context.SendingRequest2 += (sender, args) =>
    {
        if (!args.IsBatchPart) // SendingRequest2 will be called for each contained request in a Batch request. We only need to supply the headers on the top level
        {
            // Specifying the UseLog-Application MUST ALWAYS be performed
            args.RequestMessage.SetHeader("UseLog-Application", "NameOfIntegration/System");
            // If you are always connecting with a system user, you should use the UseLog-Identity to specify the identity of the user you are servicing
            args.RequestMessage.SetHeader("UseLog-Identity", servicingUser);
        }
    };

WorkZone Content Server 2014 Released

News in WorkZone Content Server OData

There are no breaking model changes in this release (compared to WZCS 2013 R2). There are however functional changes that could impact certain parts of existing code – read below.

  1. Navigation properties can now be used in the $filter part of a query/GET. It is now possible to do a query like ‘Records?$filter=File eq null’ to have returned all records where the File is hidden, or ‘Records?$filter=File ne null’ to only return Records where the File is available to the current user.
  2. OData navigation properties representing extension tables from the underlying datamodel (our data dictionary) will now have the value null in cases where there is no entry in the table in the data base. Prior to this release that was only true for extension tables that were also main tables in their own register but not for extension tables that were only accessible from within the containing register. This is now fixed so that the experience and behavior is the same regardless of the differences in the modelling. This change is a breaking change, affected scenario is updating of properties in extension tables that does not have an entry in the DB table (the navigation property value is now null) – now you have to construct the object before assigning property values.
  3. Filtering on properties in extension tables could give incorrect results if the supplied criteria is ‘eq null’. An example is ‘Records?$filter=File/FileType eq null’ that would only return Records that had a visible File and the File has a blank/empty FileType. This same query will now also return Records that does not have a visible File. This change is to be in compliance with the old search behavior in the rest of our system as well to have the same behavior as one would expect from EF.
  4. Fixed a bug where creating of entities that have update mapping to another register generated wrong SQL if the reference was only specified by supplying the join value instead of using the models reference property. An example of this is creation a new FileDate by filling the FileKey_Value with the ID of the File instead of assigning the File to the FileKey property or adding the FileDate to the Dates collection of the File.
  5. Fixed a bug where filtering on properties on Renditions from the Document entity would fail. Now you can do a query like ‘Documents?$filter=Renditions/any(r: r/Valid eq true and r/Extension eq ‘pdf’)’ to return Documents that have a valid rendition of type pdf.
  6. The DocumentRendition type now have two new navigation properties Document and Record so you can get and filter on the original Document and the Record.
  7. Fixed a bug where dates sent to the server were not correctly converted to the local server time on the server. This could lead to incorrect time offsets in both data and search criteria’s. If you have written compensating code for circumvent this issue, you might need to update your client code.
  8. Introducing a new query option adjustDatesFrom that enables the construction of queries where the server is instructed to treat filters on date properties as being relative. The classic example is the construction of a query that searches for cases created today. Normally when you resend that exact query tomorrow it will not find the cases created on that day (tomorrow). By specifying adjustDatesFrom with the original date and time where the query was created the server will be able to compensate and the resubmitted query will then automatically match cases created on “today” whenever it is executed.
  9. A simple html OData Query Builder is included as part of the OData installation. It allows for simple exploring and query building against the WorkZone system. OData Query Builder is intended for developers, advanced/super users as well as an aid for users that want to build advanced queries for something like Excel Power Pivot. The OData Query Builder can expose both the system names and friendly names for the properties.
  10. Custom endpoints can now override the default documentation labels for properties (found in Documentation/LongDescription in the $metadata document).
  11. Navigation properties in custom endpoint definitions are now also filtered on basis of the definition.
  12. The standard supplied web.config file are now preconfigured for both http and https access. You no longer need to update the web.config file to enable https.
  13. The maximum file upload size have been increased to 2GB.
  14. Fixed a bug where commas in the supplied file name (slug) during document upload would fail.
  15. Fixed a bug where queries using the $orderby clause could result in rows being skipped if the order by column was null.
  16. We now have several new custom endpoint options that can be used to shape the $metadata model to be compliant with the limited set that is supported by Microsoft LightSwitch. With these new options you can use LightSwitch as a RAD tool to create streamlined HTML5 applications for both mobile and desktop use – while writing very little code (if any).
  17. New feature – comparison between properties. You can now perform queries that compares the content of properties directly in the data base. For example: “Files?$filter=substringof(Officer_Value, Title)” will return cases where the case handlers initials is part of the case title. “Files?$filter=Closed eq Created” returns cases that where closed on the same date as it were created. “Files?$filter=Parties/any(p: p/NameKey_Value eq Officer/NameKey)” returns cases where the case handler is also a party of the case.
  18. The $metadata model now uses a new feature in WCF DS 5.6.2 that enable us to be more explicit in the declaring of relations and their multiplicity. Prior to this release all multiplicities were either “0..1” or “*” now it is also possible to have “1”. We are using this whenever the underlying model (the datadictionary) declares “1”. This change should have no impact of existing code. The generated proxy will be the same regardless this change. The change were necessary to have LightSwitch play nicely with our model.
  19. We have shortened the address of the OData service as well as removed the default odata.svc document from the address part. You can now find your OData service at http://host/OData/

WorkZone Content Server 2013 R2 Released

We are happy to announce the release of WorkZone Content Server 2013 R2. This release includes some new features for our OData service and some bug fixes.

“No breaking structural changes have been included in this release compared to the last release”

  1. Support for $skip and $top has been added to our OData provider. This will enable you to do client side paging of result sets. This feature also enables our OData provider to be used directly from Microsoft Power Query (an addin for Excel 2010 and 2013 – part of Power BI) to build queries directly from Excel. Also the development tool from Microsoft called LightSwitch depends on being able to do client side paging – so now you can develop HTML5 and SilverLight apps on top of WorkZone in no time using Microsoft LightSwitch.
  2. Custom Actions. A plugin mechanism for injecting OData Actions into the standard OData service is included in this release. Our WorkZone Process offering is utilizing this to expose their functionality together with our OData model to give an even more streamlined experience to end developers.
  3. Renditions of documents can now be stored thru our OData provider.
  4. Export.svc. A new OData service endpoit have been added specific tailored for large data exports together with the full model experience have been added. This endpoint is the preferred endpoint to use from Power Query or other scenarios where you wan’t to get really large amounts of data together with client driven paging. For all other scenarios you can safely stay on the OData.svc endpoint.
  5. Automatic Most Recently Used (MRU) tracking has been added as a system wide feature. The automatic MRU tracking Works in conjunction with a new set standard lists in the system to give in system Favorites, Followed, Reading List, Recent and Changed views to the end user.
  6. We have moved this release to Microsoft WCF Data Service 5.6.1.0. I’ll strongly recommend you to upgrade to this version in your OData client code as well as Microsoft have fixed a number of bugs relevant for us in the 5.6.1 release.
  7. Bugfix: Adding new Infoes and new Dates to an existing File in same batch request would fail. This has been fixed.

Defining custom model endpoints

In our latest release WorkZone Content Server SP1 we have included an option for defining custom endpoints on our OData provider. The idea is that you can define exactly the subset of the full model that is of interest to your needs. Custom endpoints lives side by side with the full model endpoint and does not interfere with the standard endpoint. You can define up to 10 custom endpoints and name as you wish.

A custom endpoint consist of two files placed in the OData service root folder on the web server, a *.svc file and a *.svc.config file. The .svc file is the one that hooks the endpoint up with our provider by specifying one of the 10 available custom slot to use. The .svc.config file contains the configuration of the model to be exposed. It sound maybe more complex than it really is, so let us look at an example. Say we want to define an endpoint tailored for partners writing integrations that creates Files, Records and Documents and nothing else – we could define an endpoint called Partner.svc. The partner only need access to Files, Records and Documents so we want to hide the rest of the model from them to speedup productivity. The two files can then be written as…

Partner.svc

<%@ ServiceHost
Language="C#"
Factory="System.Data.Services.DataServiceHostFactory, Microsoft.Data.Services, Version=5.6.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
Service="Scanjour.Services.OData.Web.ODataCustom3"
%>

The Partner.svc resembles the standard OData.svc file, but uses a diferent Service name. This is where the 10 available slots come in. The slots available to custom endpoints are named “Scanjour.Services.OData.Web.ODataCustom1” to “Scanjour.Services.OData.Web.ODataCustom10” the example given uses slot 3.

Partner.svc.config

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <appSettings>
    <add key="customModelExclude" value="*" />
    <add key="customModelInclude" value="Files,Records,Documents" />
  </appSettings>
</configuration>

In the Partner.svc.config file we first define customModelExclude with a value of *. This means exclude all feeds from the full model. It then defines customModelInclude with a value of Files,Records,Documents – this defines the feeds to re-include in this endpoint. Notice that it is the feed names (the sets) that are used here and not the type names.

Test your new endpoint by navigating to

http://[HOST]/[DSN]/webservices/Scanjour.Services.OData.Web/Partner.svc

from internet explorer. The endpoint responds with a list of available feeds like this:

<?xml version="1.0" encoding="utf-8"?>
<service xml:base="http://[HOST]/[DSN]/Scanjour.Services.OData.Web/Partner.svc/" xmlns="http://www.w3.org/2007/app" xmlns:atom="http://www.w3.org/2005/Atom">
  <workspace>
    <atom:title>Default</atom:title>
    <collection href="Documents">
      <atom:title>Documents</atom:title>
    </collection>
    <collection href="Files">
      <atom:title>Files</atom:title>
    </collection>
    <collection href="Records">
      <atom:title>Records</atom:title>
    </collection>
  </workspace>
</service>

In case of an error the error message will be logged in the Windows Eventlog on the webserver.
Now we have an endpoint that only exposes three feeds/resource sets, but the entities File, Record and Document are still the full entities with all properties included (except for navigation properties to entities and feeds that are not present in your new endpoint). You can also reshape the entity types so they only include the properties of interest to the partner. Let’s say that from the File entity we are only interested in Title, Officer_Value, FileClass_Value and ResponsibleOu_Value. This can be accomplished with the following change to the Partner.svc.cofig file…

Partner.svc.config

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <appSettings>
    <add key="customModelExclude" value="*" />
    <add key="customModelInclude" value="Files,Records,Documents" />
    <add key="File" value="Title,Officer_Value,FileClass_Value,ResponsibleOu_Value" />
  </appSettings>
</configuration>

Notice that the added line for shaping the File entity references the entity type name and not the feed name. Querying for Files should now return something similar to this…

<?xml version="1.0" encoding="utf-8"?>
<feed xml:base="http://[HOST]/[DSN]/webservices/Scanjour.Services.OData.Web/WorkZone/Partner.svc/" xmlns="http://www.w3.org/2005/Atom" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
  <id>http://[HOST]/[DSN]/webservices/Scanjour.Services.OData.Web/WorkZone/Partner.svc/Files</id>
  <title type="text">Files</title>
  <updated>2013-11-11T12:23:43Z</updated>
  <link rel="self" title="Files" href="Files" />
  <entry>
    <id>http://[HOST]/[DSN]/webservices/Scanjour.Services.OData.Web/WorkZone/Partner.svc/Files('2')</id>
    <category term="Som.File" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />
    <link rel="edit" title="File" href="Files('2')" />
    <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/RecordsByFileKey" type="application/atom+xml;type=feed" title="RecordsByFileKey" href="Files('2')/RecordsByFileKey" />
    <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/FileRecords" type="application/atom+xml;type=feed" title="FileRecords" href="Files('2')/FileRecords" />
    <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/RecordsByFile" type="application/atom+xml;type=feed" title="RecordsByFile" href="Files('2')/RecordsByFile" />
    <title />
    <updated>2013-11-11T12:23:43Z</updated>
    <author>
      <name />
    </author>
    <content type="application/xml">
      <m:properties>
        <d:ID>2</d:ID>
        <d:FileClass_Value>08</d:FileClass_Value>
        <d:Officer_Value>AA</d:Officer_Value>
        <d:ResponsibleOu_Value>1KT</d:ResponsibleOu_Value>
        <d:Title>Spm. S385 Om cykelstien frederiksberg allé</d:Title>
      </m:properties>
    </content>
  </entry>

As you can see only the simple properties you have specified are now included. Also note that navigation properties are automatically applied based on what feeds are available – you do not have to handle this/it is not possible to define this.
This technique can be applied generally to define endpoints for specific needs like Excel PowerPivot BI reports as to give the user a more clear focus of the data types of interest in the system.
Currently we have two known issues with custom defined endpoints that you have to be aware of:
1. The Documents feed has to be included.
2. Properties defining subclassing in the model has to be included if the entity type is include. These properties include Record/Pax, CustomLabel/Type and CustomDomain/Type_Value.

WorkZone Content Server 2013 SP1Release

WorkZone Content Server 2013 SP has officially been released. Included in this release is a new version of the WorkZone OData Services provider. This post will concentrate on new features and changes to the WorkZone OData provider.

Important: As this release introduces model changes a service reference update is required in existing client code.

  1. Adaptive paging. We have redesigned our server driven paging strategy to increase the overall throughput in mass export scenarios like PowerPivot for Excel. The new strategy will double the page size for each requested page. As a result, large data sets can be returned in a lot less roundtrips. This combined with a time based maximum allowed serializing time ensures maximum throughput without blocking the server for an excessive amount of time. The maximum allowed serializing time is configurable per installation. As per specification, clients should not make any assumptions of the actual page size returned from a request – in server driven paging it is purely the server that decides how many entities is returned.
  2. Type inheritance. Our OData model now has type inheritance. We now generate derived types for each referenced domain with a static domainParam value and for referenced table group with a static extraJoinValue in the underlying model. An example of this is the CustomLabel type that will now have a derived type for each used domainParam value. For example will the type of the CustomLabel property on FileContact (the role of a case party) now be of the derived type CustomLabelSP. This change makes it clear from the OData model what the valid CustomLabels are for a given property, before this you would have to know this yourselves or learn it by trial and error. The model is now self-explanatory in this regard. I will give some examples with code illustrating this in a separate post.
  3. Draft versioning. A new feature in WorkZone Content Server 2013 SP1 is draft versioning and of cause, our OData provider supports working with draft versions as well. A separate post will discuss this in more detail.
  4. We have redesigned the PredefinedFilter type (representing a system-defined search) it now has derived types representing the type of the search results. It includes two new reference properties for getting the search results and the count of entities matching the search criteria of the filter. With this redesign, it is possible to execute multiple predefined searches and/or getting the count of hits all in a single request.
  5. Other model changes: The Document entity has a new key format, now the RecordID is the only key property. Properties referencing the User entity will now also have a _Summary property for easy access to the full name of the user without having to expand it.
  6. Introducing Actions. OData actions are kind of like methods on an entity/object. Actions are (or can be) state dependent and only advertised on entities where they can be called. In this release, we have included the following actions on the Document entity: CheckOut, CheckIn, UndoCheckOut, EnableVersionControl, DisableVersionControl and RevertToVersion. I will give code examples of how to call actions from client C# code in a later post.
  7. Custom endpoints. A request we often get regarding our OData provider, not so much related to the OData provider, but the model we are exposing. On one hand, we want the model to be complete in the sense that everything from the underlying data store should be accessible thru our OData provider. On the other hand, we also want the best possible experience for our partners, developers, customers and users, and the full-blown OData model is not the best option here. In this release we have included an option so you can define your own additional endpoint exposing only the relevant subset of the full model for your specific usage scenarios. You can create up to 10 such usage specific endpoints. A
    custom endpoint can both limit the available types as well as the available properties on a type. I will be writing a separate post describing how to create and configure a custom endpoint.
  8. Performance improvements.
  9. In this release, we have upgraded to WCF Data Service version 5.6.0. We strongly urge you to upgrade to this version on the client side as well. Microsoft have fixed a number of performance related bugs that we have reported in this release. We can now fully recommend updating to this version and take advantage of the JSON serialization format to reduce payload and increase performance. Switching to JSON format from C# is simple – just call DataServiceContext.Format.UseJson() and you are running JSON.