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Saturday, March 23, 2013

How to write Custom SharePoint 2010 WCF Services

Writing a custom WCF service, deploying it in SharePoint as a solution and then using it in Silverlight front end. The WCF service has access to the entire object model and it can expose custom business objects, thereby allowing scenarios such as WCF RIA services.

Start Visual Studio 2010 and create a new project based on the empty SharePoint project template.
Call this project CustomWCFService and require it to be a farm solution.

It has to be a farm solution because we will deploy an .svc, and its .config file to the file system.

In the same solution, add a new project of template type WCF service library and call it MyServiceLibrary.
By default, the WCF service library project type will add a Service1 service for you. 
Because we don't want the default service added, go ahead and delete the IService1.cs and Service1.cs files. Also open the app.config for your service library, and delete everything under the system.serviceModel element. 
Next, right-click the MyServiceLibrary project and add a new WCF service called ListService.

The intent of this service is to return the lists available in the SharePoint site. 

In this example, I will only show querying, but you have access to the entire object model, so you can easily extend it to update data as well. 

The purpose of ListService is to return all the lists available within the site.
Thus go ahead and modify the IListService.cs interface to as shown here: 


[ServiceContract(Namespace="Peers")]
public interface IListService {
[OperationContract]
 List<BO.List> GetLists(); } 


As you can see, the methods that take part in the WCF operation are decorated with the [OperationContract] attribute. 
I'm returning a custom business object of type BO.List. 
The definition of BO.List is as follows: 


[DataContract] 
public class List {
[DataMember]
 public string Name { get; set; } 
[DataMember]
 public string Author { get; set; } } 


What I just did is declare the contract for the WCF service and declare the data contract of my custom business objects being sent across the wire.

WCF works in an opt-out mechanism by default. Unless I decorate something with an attribute to explicitly opt in, be it a method or a property, WCF by default will choose to exclude it in the WCF contract. 

This minimizes the attack surface for security reasons. Also I'm returning a custom business object that has nothing to do with SharePoint yet. 

It is in the actual implementation of the service that we actually talk with SharePoint.
 It is important to understand that you could choose to swap the implementation to a non-SharePoint implementation and develop the rest of the solution completely outside of SharePoint. 
However, in this scenario I will keep things to the point, so add a reference to Microsoft.SharePoint.dll in your service library project. 
Then modify the implementation of the service in the ListService.cs file to as shown below. 


Implementation for the Service 

[AspNetCompatibilityRequirements(RequirementsMode=AspNetCompatibilityRequirementsMode .Allowed)] 
public class ListsService : IListsService { 
public List<BO.List> GetLists() 

   List<BO.List> toReturn = new List<BO.List>();
   foreach (SPList list in SPContext.Current.Web.Lists) 

 toReturn.Add(
   new BO.List()
   { Name = list.Title, Author = list.Author.Name}
   ); 

   Return toReturn; } } 


The code is quite simple.

I'm simply querying for all the lists available in the site, and stuffing them into my custom business object and returning that to the caller. Of special mention here is the AspNetCompatibilityRequirements mode. Because the service will run in SharePoint 2010, by default it will run under the AspNetCompatibilityRequirements mode enabled. This makes sense because WCF is a lot bigger than just a web-based application, so for WCF to get a handle to SPContext.Current, it needs to run under the ASP.NET compatibility mode. Also what happens behind the scenes is that if you examine the web.config of any SharePoint site, it is configured to send the identity of the logged-in user to the server. It does so using the following web.config element: 

<identity impersonate="true"/> 

Thus when running under the ASP.NET compatibility mode, and with the end user's identity, the results that you query from SharePoint API are automatically security trimmed. 
My ListsService is now written. I next need to deploy this into SharePoint using a solution package. In order to do so, I will strongly name the MyServiceLibrary.dll so it can be put in the GlobalAssemblyCache (GAC). Thus, go ahead and strongly name your MyServiceLibrary.dll by going to the project properties\signing tab. 
Back in your SharePoint project, double-click the package node to open the package designer. Then at the bottom you will see the links for Design, Advanced, and Manifest, as shown in Figure 5-18. 
Click the advanced button, click the Add button, and choose Add Assembly from Project Output to add the MyServiceLibrary.dll into the solution. This can be seen in the following figure. 










At this point, your service library will get deployed into the GAC. You still need to create an endpoint within SharePoint to expose the services in the service library running inside SharePoint.

To do so, right-click the CustomWCFService and add a SharePoint mapped folder. Choose to add the ISAPI mapped folder because this folder is mapped to the _vti_bin virtual directory on any SharePoint site. Adding the ISAPI mapped folder will also add a folder under ISAPI specifically for your project.

This is good practice because your solution files will not accidentally overwrite some other solution files or other Microsoft files. Inside this folder, add two files called listservice.svc, and web.config
Your project structure at this time should look like the following. 









Inside the ListService.svc file, enter the following code: 

<%@ Assembly Name="MyServiceLibrary, Version=1.0.0.0, Culture=neutral, 
PublicKeyToken=63237040b75dd29c"%>  
<%@ ServiceHost Service="MyServiceLibrary.ListsService" %>

The ListService.svc file simply serves as an endpoint from which the service will be accessible. The name attribute in the assembly element is the assembly signature for the MyServiceLibrary.dll. 
Inside the web.config file, enter the code shown below. 
Contents of web.config for ListService 
<?xml version="1.0" encoding="utf-8" ?> 
<configuration>
 <system.serviceModel>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>
<bindings>

  <basicHttpBinding>
   <binding name="customBasicHttpBinding">
<security mode="TransportCredentialOnly">
 <transport clientCredentialType="Ntlm"/>
</security>
   </binding>

  </basicHttpBinding>
</bindings>
<services>

  <service name="MyServiceLibrary.ListsService">
   <endpoint address="" binding="basicHttpBinding" 
contract="MyServiceLibrary.IListsService" 
bindingConfiguration="customBasicHttpBinding">

   </endpoint>  </service> </services> </system.serviceModel> </configuration> 

The web.config file contains the configuration information for the WCF service. 
Specifically, we're exposing the service over basicHttpBinding, and in order to call the service we are requiring that the NTLM credential be sent along with the request. Note that if you're using Kerberos, you will have to change the clientCredentialType to "Windows". Also we're allowing the service to run under the ASP.NET compatibility mode. Build and deploy the solution and then visit 

http://sp2010/_vti_bin/CustomWCFService/listservice.svc. 

You should see the service running, as shown below.




Good! Your service is now running, and you're ready to consume it in various kinds of clients. These clients could be anything; all they require is a little bit of tweaking to your web.config file. 


Consuming the Service in a .NET Application 

Start Visual Studio and create a new console application targeting the .NET 3.5 framework. 
Call it TestWCFConsoleApp. They are two main ways to consume a WCF service in a .NET app. 

In the first approach,
you add a service reference and generate a proxy. This requires the service to either support mexHttpBinding or publish previously generated metadata statically. But somehow the client application needs to access the metadata. Metadata in basicHttpBinding is simply the WSDL of the service. It is recommended that you publish previously generated metadata statically. In this approach, because the proxy is generated from the metadata, you do not need to send a DLL. 
This means that the consuming client can be something as different as Java and it can be on the other side of the globe on a machine over which you have no influence. But the downside of this approach is that all the validations that are embedded inside your business objects will not work on the client side. 

In the second approach, the client has direct access to DLLs that hold your business objects. The disadvantage is that you have to ship the DLL in advance, but you are working with your own business objects, with your own custom validations. 

If you are interested, you should also check out WCF RIA Services, in which a portion of the business objects is copied over to the front end such as Silverlight, thereby allowing you full access to business objects logic both in back ends and front ends. 

Let’s look at both these approaches one by one. 

Approach #1: Adding a Service Reference 

Because the service running inside of SharePoint does not expose the mex endpoint, you need an alternate location where the proxy can be generated. The easiest way to do this is to set the MyServiceLibrary as your startup project and add a service reference to the service running from the MyServiceLibrary. To achieve this, simply right-click the MyServicelibrary project and choose it to be the startup project. Press F5, and the service will be hosted in the system tray web server. 

Examine the URL on which the service is running and add a service reference to that URL. In this case, the service was running at http://localhost:8732/Design_Time_Addresses/MyServiceLibrary/ ListsService. 

Call the service reference generated proxy ServiceReference1. 
Adding a service reference through Visual Studio makes some inferences about the service and generates a client-side configuration file for you. Now you need to edit this file because we generated the proxy from a location different from the actual service address. Also, the proxy location was running the service under wsHttpBinding under anonymous security, whereas the real service is running inside SharePoint under NTLM security. Thus, you need to edit the app.config file of the TestWCFConsoleApp as shown below. 

The app.config File for the WCF Test Console App 

<?xml version="1.0" encoding="utf-8" ?> 
<configuration> <system.serviceModel> <bindings>  <basicHttpBinding>   <binding name="authenticatedBasicHttpBinding"> 
<security mode="TransportCredentialOnly">
 <transport clientCredentialType="Ntlm" proxyCredentialType="Ntlm"/>
 <message clientCredentialType="UserName"/>

</security>
   </binding>

  </basicHttpBinding>
</bindings>
<client>

  <endpoint
    address="http://sp2010/_vti_bin/CustomWCFService/listservice.svc"
 binding="basicHttpBinding"
bindingConfiguration="authenticatedBasicHttpBinding"
contract="ServiceReference1.IListsService">

  </endpoint> </client> </system.serviceModel> </configuration> 

The edits to the app.config file simply specify that I will use basicHttpBinding and that I have to send the NTLM identity to a specific URL (SharePoint service) with my requests! Your service reference is all set! You can now go ahead and write code as shown below in your static void main of your console application. 

Code to Call a WCF Service from a Console Application 

ServiceReference1.ListsServiceClient client =
 new ServiceReference1.ListsServiceClient(); 
client.ClientCredentials.Windows.AllowedImpersonationLevel =  TokenImpersonationLevel.Impersonation; 
ServiceReference1.List[] lists = client.GetLists() ; 
foreach (var list in lists) {  Console.WriteLine(list.Name); } 
client.Close(); 

Build and compile your application. You should see the list names. 

Your console application, which might as well be a .NET 4.0 or even a Java app, can query the WCF service and show security trimmed SharePoint data. 

Approach #2: Adding a DLL Reference 

Create a new console application, again targeting the .NET 3.5 framework, and call it TestWCFConsoleApp2. In this application, add a reference to the MyServicelibrary project, which will give the console application visibility into the business objects and interfaces necessary to consume the WCF service. Also go ahead and add a reference to System.ServiceModel. 

Then write code as shown below in your static void main. 

Calling a WCF Service from a Console Application Without a Reference 

BasicHttpBinding myBinding = new BasicHttpBinding(); 
myBinding.Security.Mode = BasicHttpSecurityMode.TransportCredentialOnly; myBinding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Ntlm; myBinding.Security.Transport.ProxyCredentialType = HttpProxyCredentialType.Ntlm; myBinding.Security.Message.ClientCredentialType = BasicHttpMessageCredentialType.UserName; 
ChannelFactory<IListsService> channelFactory = new ChannelFactory<IListsService>( 
myBinding,
  new EndpointAddress("http://sp2010/_vti_bin/CustomWCFService/listservice.svc") 
); channelFactory.Credentials.Windows.AllowedImpersonationLevel = 
System.Security.Principal.TokenImpersonationLevel.Impersonation; 
IListsService listService = channelFactory.CreateChannel(); 
var lists = listService.GetLists(); 
foreach (var list in lists) { 
Console.WriteLine(list.Name); } 

Execute this application and you should see the lists being written out on console just like before. 
If you look at the code in both approaches closely, you should notice some similarities. In both instances, we are getting an instance to basic HTTP binding and are configuring it to work under the NTLM authentication. We're setting the client impersonation level. The only difference is how we're getting a handle to a proxy. In one instance, the proxy is generated based on the published metadata. In the second instance, the proxy is generated using the channel factory and strongly typed to the actual business object. 





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