LogicalMethodInfo.AsyncStateParameter Property
Gets the parameter information for the AsyncState parameter of a Begin method in an asynchronous invocation.
Assembly: System.Web.Services (in System.Web.Services.dll)
Property Value
Type: System.Reflection.ParameterInfoA ParameterInfo representing the AsyncState parameter of a Begin method in an asynchronous invocation.
The asynchronous design pattern in the common language runtime involves calling a Begin method to start the asynchronous method invocation and an End method to complete the invocation. The Begin method takes two additional parameters besides the parameters defined by the synchronous version of the method: one to store a delegate and one to store any state information that needs to be passed on to the delegate. This property represents the state information that needs to be passed into the delegate.
For more information on invoking XML Web services asynchronously, see [<topic://cpconInvokingWebServicesAsynchronously>].
Imports System Imports System.Reflection Imports System.Web.Services.Protocols Imports Microsoft.VisualBasic Public Class MyService Inherits SoapHttpClientProtocol Public Function BeginAdd _ (xValue As Integer, yValue As Integer, callback As AsyncCallback, asyncState As Object) _ As IAsyncResult Return Me.BeginInvoke("Add", New Object() {xValue, yValue}, callback, asyncState) End Function 'BeginAdd Public Function EndAdd(asyncResult As System.IAsyncResult) As Integer Dim results As Object() = Me.EndInvoke(asyncResult) Return CInt(results(0)) End Function 'EndAdd End Class 'MyService Public Class LogicalMethodInfo_Create Public Shared Sub Main() Dim myType As Type = GetType(MyService) Dim myBeginMethod As MethodInfo = myType.GetMethod("BeginAdd") Dim myEndMethod As MethodInfo = myType.GetMethod("EndAdd") Dim myLogicalMethodInfo As LogicalMethodInfo = _ LogicalMethodInfo.Create(New MethodInfo() _ {myBeginMethod, myEndMethod}, LogicalMethodTypes.Async)(0) Console.WriteLine _ (ControlChars.Newline + "The asynchronous callback parameter of method {0} is :" + _ ControlChars.Newline, myLogicalMethodInfo.Name) Console.WriteLine _ (ControlChars.Tab + myLogicalMethodInfo.AsyncCallbackParameter.Name + " : " + _ myLogicalMethodInfo.AsyncCallbackParameter.ParameterType.ToString()) Console.WriteLine _ (ControlChars.Newline + "The asynchronous state parameter of method {0} is :" + _ ControlChars.Newline, myLogicalMethodInfo.Name) Console.WriteLine _ (ControlChars.Tab + myLogicalMethodInfo.AsyncStateParameter.Name + " : " + _ myLogicalMethodInfo.AsyncStateParameter.ParameterType.ToString()) Console.WriteLine _ (ControlChars.Newline + "The asynchronous result parameter of method {0} is :" + _ ControlChars.Newline, myLogicalMethodInfo.Name) Console.WriteLine _ (ControlChars.Tab + myLogicalMethodInfo.AsyncResultParameter.Name + " : " + _ myLogicalMethodInfo.AsyncResultParameter.ParameterType.ToString()) Console.WriteLine _ (ControlChars.Newline + "The begin method of the asynchronous method {0} is :" + _ ControlChars.Newline, myLogicalMethodInfo.Name) Console.WriteLine(ControlChars.Tab + myLogicalMethodInfo.BeginMethodInfo.ToString()) Console.WriteLine _ (ControlChars.Newline + "The end method of the asynchronous method {0} is :" + _ ControlChars.Newline, myLogicalMethodInfo.Name) Console.WriteLine(ControlChars.Tab + myLogicalMethodInfo.EndMethodInfo.ToString()) If myLogicalMethodInfo.IsAsync Then Console.WriteLine(ControlChars.Newline + "{0} is asynchronous", myLogicalMethodInfo.Name) Else Console.WriteLine(ControlChars.Newline + "{0} is synchronous", myLogicalMethodInfo.Name) End If End Sub 'Main End Class 'LogicalMethodInfo_Create
Available since 1.1
AsyncCallbackParameter
AsyncResultParameter
ParameterInfo
LogicalMethodInfo Class
System.Web.Services.Protocols Namespace
[<topic://cpconInvokingWebServicesAsynchronously>]