LogicalMethodInfo.BeginInvoke(Object, Object[], AsyncCallback, Object) 方法

定义

命名空间:

System.Web.Services.Protocols

程序集:

System.Web.Services.dll

开始对由此 LogicalMethodInfo 表示的方法的异步调用。

public:
 IAsyncResult ^ BeginInvoke(System::Object ^ target, cli::array <System::Object ^> ^ values, AsyncCallback ^ callback, System::Object ^ asyncState);

public IAsyncResult BeginInvoke (object target, object[] values, AsyncCallback callback, object asyncState);

member this.BeginInvoke : obj * obj[] * AsyncCallback * obj -> IAsyncResult

Public Function BeginInvoke (target As Object, values As Object(), callback As AsyncCallback, asyncState As Object) As IAsyncResult

参数

target

Object

在其上调用该方法的 Object 的实例。

values

Object[]

调用的方法的参数列表。 这是一个对象数组，其数量、顺序和类型与该方法的参数相同。 如果该方法不需要任何参数，values 应为 null。

callback

AsyncCallback

异步调用完成时要调用的委托。 如果 callback 为 null，则不调用委托。

asyncState

Object

传递到委托上的状态信息。

返回

IAsyncResult

IAsyncResult，传递给 EndInvoke(Object, IAsyncResult) 以从远程方法调用中获取返回值。

例外

TargetException

target 参数为 null。

ArgumentException

values 中的参数的数量、类型和顺序与被调用的方法的签名不匹配。

MemberAccessException

调用方没有调用该方法的权限。

示例

public:
   [PermissionSet(SecurityAction::Demand, Name="FullTrust")]
   static void main()
   {
      // Get the type information.
      // Note: The MyMath class is a proxy class generated by the Wsdl.exe
      // utility for the Math Web service. This class can also be found in
      // the SoapHttpClientProtocol class example.
      Type^ myType = MyMath::MyMath::typeid;

      // Get the method info.
      MethodInfo^ myBeginMethod = myType->GetMethod( "BeginAdd" );
      MethodInfo^ myEndMethod = myType->GetMethod( "EndAdd" );

      // Create an instance of the LogicalMethodInfo class.
      array<MethodInfo^>^ temp0 = { myBeginMethod, myEndMethod };
      LogicalMethodInfo^ myLogicalMethodInfo =
         ( LogicalMethodInfo::Create( temp0, LogicalMethodTypes::Async ) )[ 0 ];

      // Get an instance of the proxy class.
      MyMath::MyMath^ myMathService = gcnew MyMath::MyMath;

      // Call the MyEndIntimationMethod method to intimate the end of
      // the asynchronous call.
      AsyncCallback^ myAsyncCallback = gcnew AsyncCallback( MyEndIntimationMethod );

      // Begin to invoke the Add method.
      array<Object^>^ temp1 = { 10, 10 };
      IAsyncResult^ myAsyncResult = myLogicalMethodInfo->BeginInvoke(
         myMathService, temp1, myAsyncCallback, nullptr );

      // Wait until invoke is complete.
      myAsyncResult->AsyncWaitHandle->WaitOne();

      // Get the result.
      array<Object^>^ myReturnValue;
      myReturnValue = myLogicalMethodInfo->EndInvoke( myMathService, myAsyncResult );

      Console::WriteLine( "Sum of 10 and 10 is {0}", myReturnValue[ 0 ] );
   }

   // This method will be called at the end of the asynchronous call.
   static void MyEndIntimationMethod( IAsyncResult^ /*Result*/ )
   {
      Console::WriteLine( "Asynchronous call on Add method finished." );
   }

public static void Main()
{
   // Get the type information.
   // Note: The MyMath class is a proxy class generated by the Wsdl.exe
   // utility for the Math Web service. This class can also be found in
   // the SoapHttpClientProtocol class example.
   Type myType = typeof(MyMath.MyMath);

   // Get the method info.
   MethodInfo myBeginMethod = myType.GetMethod("BeginAdd");
   MethodInfo myEndMethod = myType.GetMethod("EndAdd");

   // Create an instance of the LogicalMethodInfo class.
   LogicalMethodInfo myLogicalMethodInfo =
      (LogicalMethodInfo.Create(new MethodInfo[] {myBeginMethod,myEndMethod},
      LogicalMethodTypes.Async))[0];

   // Get an instance of the proxy class.
   MyMath.MyMath myMathService = new MyMath.MyMath();

   // Call the MyEndIntimationMethod method to intimate the end of
   // the asynchronous call.
   AsyncCallback myAsyncCallback = new AsyncCallback(MyEndIntimationMethod);

   // Begin to invoke the Add method.
   IAsyncResult myAsyncResult = myLogicalMethodInfo.BeginInvoke(
      myMathService,new object[]{10,10},myAsyncCallback,null);

   // Wait until invoke is complete.
   myAsyncResult.AsyncWaitHandle.WaitOne();

   // Get the result.
   object[] myReturnValue;
   myReturnValue = myLogicalMethodInfo.EndInvoke(myMathService,myAsyncResult);

   Console.WriteLine("Sum of 10 and 10 is " + myReturnValue[0]);
}

// This method will be called at the end of the asynchronous call.
static void MyEndIntimationMethod(IAsyncResult Result)
{
   Console.WriteLine("Asynchronous call on Add method finished.");
}

Public Shared Sub Main()

   ' Get the type information.
   ' Note: The MyMath class is a proxy class generated by the Wsdl.exe 
   ' utility for the Math Web Service. This class can also be found in
   ' the SoapHttpClientProtocol class example. 
   Dim myType As Type = GetType(MyMath.MyMath)

   ' Get the method info.
   Dim myBeginMethod As MethodInfo = myType.GetMethod("BeginAdd")
   Dim myEndMethod As MethodInfo = myType.GetMethod("EndAdd")

   ' Create an instance of the LogicalMethodInfo class.
   Dim myLogicalMethodInfo As LogicalMethodInfo = _
      LogicalMethodInfo.Create(New MethodInfo() {myBeginMethod, myEndMethod}, _
      LogicalMethodTypes.Async)(0)

   ' Get an instance of the proxy class.
   Dim myMathService As New MyMath.MyMath()

   ' Call the MyEndIntimationMethod method to intimate the end of 
   ' the asynchronous call.
   Dim myAsyncCallback As New AsyncCallback(AddressOf MyEndIntimationMethod)

   ' Beging to invoke the Add method.
   Dim myAsyncResult As IAsyncResult = _
      myLogicalMethodInfo.BeginInvoke( _
      myMathService, New Object() {10, 10}, myAsyncCallback, Nothing)

   ' Wait until invoke is complete.
   myAsyncResult.AsyncWaitHandle.WaitOne()

   ' Get the result.
   Dim myReturnValue() As Object
   myReturnValue = myLogicalMethodInfo.EndInvoke(myMathService, myAsyncResult)

   Console.WriteLine(("Sum of 10 and 10 is " & myReturnValue(0)))
End Sub

' This method will be called at the end of asynchronous call.
Shared Sub MyEndIntimationMethod(ByVal Result As IAsyncResult)
   Console.WriteLine("Asynchronous call on method 'Add' finished.")
End Sub