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MetadataResolver.BeginResolve Method (IEnumerable<ContractDescription>, EndpointAddress, MetadataExchangeClient, AsyncCallback, Object)

Begins an asynchronous call that resolves a metadata address into the ServiceEndpoint objects for the specified contracts, using the specified address, System.ServiceModel.Description.MetadataExchangeClient, asynchronous state and delegate.

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

public static IAsyncResult BeginResolve(
	IEnumerable<ContractDescription> contracts,
	EndpointAddress address,
	MetadataExchangeClient client,
	AsyncCallback callback,
	Object asyncState


Type: System.Collections.Generic.IEnumerable<ContractDescription>
The contracts for which to download and resolve metadata.
Type: System.ServiceModel.EndpointAddress
The metadata address.
Type: System.ServiceModel.Description.MetadataExchangeClient
The System.ServiceModel.Description.MetadataExchangeClient used to retrieve the metadata.
Type: System.AsyncCallback
The asynchronous callback delegate invoked when the call is complete.
Type: System.Object
The state associated with the asynchronous call.

Return Value

Type: System.IAsyncResult
The IAsyncResult that references the asynchronous resolve operation.


The address, contract, client, or callback is null.


contracts is empty, at least one member of contracts is null, or contracts contains more than one contract with the same name and namespace.

The default System.ServiceModel.Description.MetadataExchangeClientMode is MetadataExchangeClientMode.MetadataExchange.

To download metadata but not resolve the information into ServiceEndpoint objects, use the System.ServiceModel.Description.MetadataExchangeClient directly.


An empty collection is returned if no endpoints were imported or if no endpoints matched the contract. If an empty collection is returned, a warning trace is written.

.NET Framework

Supported in: 4, 3.5, 3.0

.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.