This documentation is archived and is not being maintained.

MetadataResolver.BeginResolve Method (IEnumerable<ContractDescription>, Uri, MetadataExchangeClientMode, 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, System.ServiceModel.Description.MetadataExchangeClientMode, asynchronous state, and delegate.

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

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


Type: System.Collections.Generic.IEnumerable<ContractDescription>

The contracts for which to download and resolve metadata.

Type: System.Uri

The metadata address.

Type: System.ServiceModel.Description.MetadataExchangeClientMode

The mode of retrieval.

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, 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.

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.

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