AsyncResultParameter Property

LogicalMethodInfo.AsyncResultParameter Property

 

Gets the return value of a Begin asynchronous method invocation.

Namespace:   System.Web.Services.Protocols
Assembly:  System.Web.Services (in System.Web.Services.dll)

public ParameterInfo AsyncResultParameter { get; }

Property Value

Type: System.Reflection.ParameterInfo

A ParameterInfo representing the IAsyncResult returned from a Begin asynchronous method 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 typically returns immediately with an object implementing the IAsyncResult interface, which can then be passed to the End method at a later time to complete the asynchronous method invocation. The returned object implementing the IAsyncResult interface is represented by this property.

For more information on invoking XML Web services asynchronously, see F9E26A43-063A-440A-8C73-A02F2CCF3EA0.

using System;
using System.Reflection;
using System.Web.Services.Protocols;

public class MyService : SoapHttpClientProtocol
{
   public IAsyncResult BeginAdd(int xValue, int yValue,
                                AsyncCallback callback,
                                object asyncState)
   {
      return this.BeginInvoke("Add", new object[] {xValue,yValue}, callback, asyncState);
   }

   public int EndAdd(System.IAsyncResult asyncResult) 
   {
      object[] results = this.EndInvoke(asyncResult);
      return ((int)(results[0]));
   } 
}

public class LogicalMethodInfo_Create
{
   public static void Main()
   {
      Type myType = typeof(MyService);
      MethodInfo myBeginMethod = myType.GetMethod("BeginAdd");
      MethodInfo myEndMethod = myType.GetMethod("EndAdd");
      LogicalMethodInfo myLogicalMethodInfo = 
         (LogicalMethodInfo.Create(new MethodInfo[] { myBeginMethod,
                                                      myEndMethod },
                                   LogicalMethodTypes.Async))[0];

      Console.WriteLine("\nThe asynchronous callback parameter of method {0} is :\n",
                           myLogicalMethodInfo.Name);
      Console.WriteLine("\t" + myLogicalMethodInfo.AsyncCallbackParameter.Name +
                              " : " + myLogicalMethodInfo.AsyncCallbackParameter.ParameterType);

            Console.WriteLine("\nThe asynchronous state parameter of method {0} is :\n",
         myLogicalMethodInfo.Name);
      Console.WriteLine("\t" + myLogicalMethodInfo.AsyncStateParameter.Name +
         " : " + myLogicalMethodInfo.AsyncStateParameter.ParameterType);

      Console.WriteLine("\nThe asynchronous result parameter of method {0} is :\n",
         myLogicalMethodInfo.Name);
      Console.WriteLine("\t" + myLogicalMethodInfo.AsyncResultParameter.Name +
         " : " + myLogicalMethodInfo.AsyncResultParameter.ParameterType);

      Console.WriteLine("\nThe begin method of the asynchronous method {0} is :\n",
         myLogicalMethodInfo.Name);
      Console.WriteLine("\t" + myLogicalMethodInfo.BeginMethodInfo);

      Console.WriteLine("\nThe end method of the asynchronous method {0} is :\n",
         myLogicalMethodInfo.Name);
      Console.WriteLine("\t" + myLogicalMethodInfo.EndMethodInfo);

      if(myLogicalMethodInfo.IsAsync)
         Console.WriteLine("\n{0} is asynchronous", myLogicalMethodInfo.Name);
      else
         Console.WriteLine("\n{0} is synchronous", myLogicalMethodInfo.Name);

   }
}

.NET Framework
Available since 1.1
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