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InvalidMessageContractException Class

Represents a message contract that is not valid.

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

public class InvalidMessageContractException : SystemException

The InvalidMessageContractException is thrown when custom attribute usage results in the generation of an invalid service description. For example, if a System.ServiceModel.MessageContractAttribute type has multiple parts with the same name, or a method has multiple parameters with the same name.

The following code example shows a contract and service that throws an InvalidMessageContractException that says operand appears more than once in the message.

[ServiceContract(Namespace = "")]
public interface IMath
    void Add(AddMessage a);

public class AddMessage 
    public int a;

    [MessageBodyMember(Name = "operand")]
    public int b;


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

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0