SoapHttpClientProtocol.EndInvoke Method

Ends an asynchronous invocation of an XML Web service method using SOAP.

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

Protected Function EndInvoke ( _
	asyncResult As IAsyncResult _
) As Object()
Dim asyncResult As IAsyncResult
Dim returnValue As Object()

returnValue = Me.EndInvoke(asyncResult)
protected Object[] EndInvoke (
	IAsyncResult asyncResult
protected function EndInvoke (
	asyncResult : IAsyncResult
) : Object[]
Not applicable.



The IAsyncResult returned from the BeginInvoke method.

Return Value

An array of objects that contains the return value and any by-reference or out parameters of the derived class method.

Exception typeCondition


asyncResult is not the return value from the BeginInvoke method.


The request reached the server computer, but was not processed successfully.

Typically, you would not call the EndInvoke method directly, unless you were building your own proxy class for an XML Web service.

A proxy class generated by the Web Services Description Language tool (Wsdl.exe) for an XML Web service exposes the XML Web service methods as names off of the proxy class for calling the XML Web service methods synchronously. For calling the XML Web service methods asynchronously, two additional methods are added to the proxy class for each XML Web service method, one with the Begin prefix added to the name of the XML Web service method and one with the End prefix added.

The proxy class calls the EndInvoke method to complete an asynchronous invocation call to the XML Web service method. For example, if an XML Web service exposes an XML Web service method named Add, the proxy class contains a method named EndAdd, for completing an asynchronous invocation of an XML Web service method. Within the code for the EndAdd a call is made to the EndInvoke method and then the results are placed into the expected return type for Add.

The following code example is a proxy class generated by Wsdl.exe for the Math XML Web service. Within the EndAdd method of the proxy class, the EndInvoke method completes the asynchronous invocation to the Add XML Web service method.

Option Strict On
Option Explicit On

Imports System
Imports System.Diagnostics
Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.Xml.Serialization

Namespace MyMath
    <System.Web.Services.WebServiceBindingAttribute(Name:="MyMathSoap", [Namespace]:="")>  _
    Public Class MyMath
        Inherits System.Web.Services.Protocols.SoapHttpClientProtocol
        <System.Diagnostics.DebuggerStepThroughAttribute()>  _
        Public Sub New()
            Me.Url = ""
        End Sub
        <System.Diagnostics.DebuggerStepThroughAttribute(),  _
         System.Web.Services.Protocols.SoapDocumentMethodAttribute("", RequestNamespace:="", ResponseNamespace:="", Use:=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle:=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)>  _
        Public Function Add(ByVal num1 As Integer, ByVal num2 As Integer) As Integer
            Dim results() As Object = Me.Invoke("Add", New Object() {num1, num2})
            Return CType(results(0),Integer)
        End Function
        <System.Diagnostics.DebuggerStepThroughAttribute()>  _
        Public Function BeginAdd(ByVal num1 As Integer, ByVal num2 As Integer, ByVal callback As System.AsyncCallback, ByVal asyncState As Object) As System.IAsyncResult
            Return Me.BeginInvoke("Add", New Object() {num1, num2}, callback, asyncState)
        End Function
        <System.Diagnostics.DebuggerStepThroughAttribute()>  _
        Public Function EndAdd(ByVal asyncResult As System.IAsyncResult) As Integer
            Dim results() As Object = Me.EndInvoke(asyncResult)
            Return CType(results(0),Integer)
        End Function
    End Class
End Namespace

package MyMath; 

import System.Diagnostics.*;
import System.Xml.Serialization.*;
import System.*;
import System.Web.Services.Protocols.*;
import System.Web.Services.*;

/** @attribute System.Web.Services.WebServiceBindingAttribute(
     Name = "MyMathSoap", Namespace = "")

public class MyMath extends System.Web.Services.Protocols.SoapHttpClientProtocol
    /** @attribute System.Diagnostics.DebuggerStepThroughAttribute()

    public MyMath()
    } //MyMath

    /** @attribute System.Diagnostics.DebuggerStepThroughAttribute()

    /** @attribute System.Web.Services.Protocols.SoapDocumentMethodAttribute(
        "", RequestNamespace = 
        "", ResponseNamespace = 
        "", Use = 
        System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle 
        = System.Web.Services.Protocols.SoapParameterStyle.Wrapped)

    public int Add(int num1, int num2)
        Object results[] = this.Invoke("Add", new Object[] { 
            (Int32)num1, (Int32)num2 });
        return (int)((Int32)results.get_Item(0));
    } //Add

    /** @attribute System.Diagnostics.DebuggerStepThroughAttribute()

    public System.IAsyncResult BeginAdd(int num1, int num2, 
        System.AsyncCallback callback, Object asyncState)
        return this.BeginInvoke("Add", new Object[] { 
            (Int32)num1, (Int32)num2 }, callback, asyncState);
    } //BeginAdd

    /** @attribute System.Diagnostics.DebuggerStepThroughAttribute()

    public int EndAdd(System.IAsyncResult asyncResult)
        Object results[] = this.EndInvoke(asyncResult);
        return (int)((Int32)results.get_Item(0));
    } //EndAdd
} //MyMath

The following code example is the Math XML Web service, from which the preceding proxy class was created.

<%@ WebService Language="VB" Class="MyMath"%>
Imports System.Web.Services
Imports System

<WebService(Namespace:="")> _
Public Class MyMath
    <WebMethod()> _
    Public Function Add(num1 As Integer, num2 As Integer) As Integer
        Return num1 + num2
    End Function 'Add
End Class 'Math

<%@ WebService Language="VJ#" Class="MyMath"%>
import System.Web.Services .* ;
import System .* ;

/** @attribute WebService(Namespace = "")
* */
public class MyMath
   /** @attribute WebMethod()
   * */
   public int Add(int num1, int num2) 
      return num1 + num2 ;

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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