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IContract.QueryContract Method

Returns a contract that is implemented by this contract.

Namespace:  System.AddIn.Contract
Assembly:  System.AddIn.Contract (in System.AddIn.Contract.dll)

IContract QueryContract(
	string contractIdentifier


Type: System.String
A string that identifies the contract that is being requested.

Return Value

Type: System.AddIn.Contract.IContract
An IContract that represents a contract that a client is requesting from the current contract; null if the current contract does not support the contract that is requested.

The QueryContract method enables IContract objects to expose other contracts. QueryContract serves a purpose similar to that of the IUnknown.QueryInterface method in COM.

The format of the strings used to identify contracts is defined by the IContract implementation. It is recommended that you use the AssemblyQualifiedName of the contract that is being queried.

.NET Framework

Supported in: 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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