Windows apps
Collapse the table of content
Expand the table of content
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

ContractDescription Class


The .NET API Reference documentation has a new home. Visit the .NET API Browser on to see the new experience.

Describes a Windows Communication Foundation (WCF) contract that specifies what an endpoint communicates to the outside world.

Namespace:   System.ServiceModel.Description
Assembly:  System.ServiceModel (in System.ServiceModel.dll)


public class ContractDescription


Initializes a new instance of the ContractDescription class with a specified name.

System_CAPS_pubmethodContractDescription(String, String)

Initializes a new instance of the ContractDescription class with a namespace-qualified name specified.


Gets the behaviors associated with the contract description.


Gets or sets the type of callback contract that the contract description specifies.


Gets or sets the configuration name for the contract description.


Gets the collection of behavior for the contract.


Gets or sets the contract type that the contract description specifies.


Gets a value that indicates whether the contract has had a protection level set.


Gets or sets the name of the contract.


Gets or sets the namespace for the contract.


Gets the collection of operation descriptions associated with the contract.


Gets or sets the level of security protection associated with the contract.


Gets or sets a value that indicates whether a session is required by the contract.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Returns the contract description for a specified type of contract.

System_CAPS_pubmethodSystem_CAPS_staticGetContract(Type, Object)

Returns the contract description for a specified type of contract and service implementation.

System_CAPS_pubmethodSystem_CAPS_staticGetContract(Type, Type)

Returns the contract description for a specified type of contract and a specified type of service.


Serves as the default hash function. (Inherited from Object.)


Returns a collection of contract descriptions that are inherited by the current contract description.


Gets the Type of the current instance.(Inherited from Object.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Returns a value that indicates whether the ProtectionLevel property has changed from its default value and should be serialized.


Returns a string that represents the current object.(Inherited from Object.)

A WCF contract is a collection of operations that specifies what the endpoint communicates to the outside world. Each operation is a message exchange. For example, a request message and an associated reply message form a request/reply message exchange.

A ContractDescription object is used to describe WCF contracts and their operations. Within a ContractDescription, each contract operation has a corresponding OperationDescription that describes aspects of the each operation that is part of the contract, such as whether the operation is one-way or request/reply. Each OperationDescription also describes the messages that make up the operation using a MessageDescriptionCollection. ContractDescription contains a reference to an interface that defines the contract using the programming model. This interface is marked with ServiceContractAttribute and its methods that correspond to endpoint operations are marked with the OperationContractAttribute.

A duplex contract defines the following logical sets of operations:

  • A set that the service exposes for the client to call.

  • A set that the client exposes for the service to call.

The programming model for defining a duplex contract is to split each set in a separate interface and apply attributes to each interface. In this case, ContractDescription contains a reference to each of the interfaces that groups them into one duplex contract.

Similar to bindings, each contract has a Name and Namespace that uniquely identify it in the metadata of the service.

The following example shows a number of ways to create or retrieve a ContractDescription object. It then displays the various pieces of information that are stored in the ContractDescription object.

Uri baseAddress = new Uri("http://localhost:8001/Simple");
ServiceHost serviceHost = new ServiceHost(typeof(CalculatorService), baseAddress);

    new WSHttpBinding(),

// Enable Mex
ServiceMetadataBehavior smb = new ServiceMetadataBehavior();
smb.HttpGetEnabled = true;


ContractDescription cd0 = new ContractDescription("ICalculator");
ContractDescription cd1 = new ContractDescription("ICalculator", "");
ContractDescription cd2 = ContractDescription.GetContract(typeof(ICalculator));
CalculatorService calcSvc = new CalculatorService();
ContractDescription cd3 = ContractDescription.GetContract(typeof(ICalculator), calcSvc);
ContractDescription cd4 = ContractDescription.GetContract(typeof(ICalculator), typeof(CalculatorService));
ContractDescription cd = serviceHost.Description.Endpoints[0].Contract;         

Console.WriteLine("Displaying information for contract: {0}", cd.Name.ToString());

KeyedByTypeCollection<IContractBehavior> behaviors = cd.Behaviors;
Console.WriteLine("\tDisplay all behaviors:");
foreach (IContractBehavior behavior in behaviors)
    Console.WriteLine("\t\t" + behavior.ToString());

Type type = cd.CallbackContractType;

string configName = cd.ConfigurationName;
Console.WriteLine("\tConfiguration name: {0}", configName);

Type contractType = cd.ContractType;
Console.WriteLine("\tContract type: {0}", contractType.ToString());

bool hasProtectionLevel = cd.HasProtectionLevel;
if (hasProtectionLevel)
    ProtectionLevel protectionLevel = cd.ProtectionLevel;
    Console.WriteLine("\tProtection Level: {0}", protectionLevel.ToString());

string name = cd.Name;
Console.WriteLine("\tName: {0}", name);

string namespc = cd.Namespace;
Console.WriteLine("\tNamespace: {0}", namespc);

OperationDescriptionCollection odc = cd.Operations;
Console.WriteLine("\tDisplay Operations:");
foreach (OperationDescription od in odc)
    Console.WriteLine("\t\t" + od.Name);

SessionMode sm = cd.SessionMode;
Console.WriteLine("\tSessionMode: {0}", sm.ToString());

Collection<ContractDescription> inheretedContracts = cd.GetInheritedContracts();
Console.WriteLine("\tInherited Contracts:");
foreach (ContractDescription contractdescription in inheretedContracts)
    Console.WriteLine("\t\t" + contractdescription.Name);

Console.WriteLine("The service is ready.");
Console.WriteLine("Press <ENTER> to terminate service.");

// Close the ServiceHostBase to shutdown the service.

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.0
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0

Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Return to top
© 2018 Microsoft