HttpSimpleClientProtocol.BeginInvoke 方法

参考

定义

命名空间:: System.Web.Services.Protocols

程序集:: System.Web.Services.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

开始异步调用 XML Web services 的方法。

protected:
 IAsyncResult ^ BeginInvoke(System::String ^ methodName, System::String ^ requestUrl, cli::array <System::Object ^> ^ parameters, AsyncCallback ^ callback, System::Object ^ asyncState);

protected IAsyncResult BeginInvoke (string methodName, string requestUrl, object[] parameters, AsyncCallback callback, object asyncState);

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

Protected Function BeginInvoke (methodName As String, requestUrl As String, parameters As Object(), callback As AsyncCallback, asyncState As Object) As IAsyncResult

参数

methodName: String

XML Web services 方法的名称。

requestUrl: String

创建 WebRequest 时要使用的 URL。

parameters: Object[]

一个对象数组，包含要传递到 XML Web services 方法的参数。数组中值的顺序与派生类的调用方法中的参数顺序对应。

callback: AsyncCallback

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

asyncState: Object

客户端提供的其他信息。

IAsyncResult

一个 IAsyncResult，它可以传递到 EndInvoke(IAsyncResult) 方法以从 XML Web services 方法中获取返回值。

例外

Exception

请求到达了服务器计算机，但未被成功处理。

示例

下面的代码示例是一个 ASP.NET Web 窗体，它调用名为的 MathXML Web 服务。 EnterBtn_Click在函数中，Web 窗体启动并完成 XML Web 服务方法的Add异步调用。

<%@ Page Language="VB" %>
<html>
    <script language="VB" runat="server">
    Sub EnterBtn_Click(Src As Object, E As EventArgs)
        Dim math As New MyMath.Math()
        
        ' Call to Add XML Web service method asynchronously.
        Dim result As IAsyncResult = math.BeginAdd(Convert.ToInt32(Num1.Text), Convert.ToInt32(Num2.Text), Nothing, Nothing)
        
        ' Wait for the asynchronous call to complete.
        result.AsyncWaitHandle.WaitOne()
        
        ' Complete the asynchronous call to the Add XML Web service method.
        Dim iTotal As Integer = math.EndAdd(result)
        
        Total.Text = "Total: " & iTotal.ToString()
    End Sub 'EnterBtn_Click
 
  </script>
 
    <body>
       <form action="MathClient.aspx" runat=server>
           
          Enter the two numbers you want to add and then press the Total button.
          <p>
          Number 1: <asp:textbox id="Num1" runat=server/>  +
          Number 2: <asp:textbox id="Num2" runat=server/> =
          <asp:button text="Total" Onclick="EnterBtn_Click" runat=server/>
          <p>
          <asp:label id="Total"  runat=server/>
          
       </form>
    </body>
 </html>

下面的代码示例是由以下 XML Math Web 服务的 Web 服务描述语言工具 (Wsdl.exe) 生成的代理类。 BeginAdd在代理类的方法中BeginInvoke，方法启动 XML Web 服务方法的Add异步调用。

namespace MyMath
{
   [XmlRootAttribute("snippet1>",Namespace="http://MyMath/",IsNullable=false)]
   public ref class Math: public HttpGetClientProtocol
   {
   public:
      Math()
      {
         this->Url = "http://www.contoso.com/math.asmx";
      }

      [HttpMethodAttribute(System::Web::Services::Protocols::XmlReturnReader::typeid,
      System::Web::Services::Protocols::UrlParameterWriter::typeid)]
      int Add( String^ num1, String^ num2 )
      {
         array<Object^>^temp0 = {num1,num2};
         return  *dynamic_cast<int^>(this->Invoke( "Add", String::Concat( this->Url, "/Add" ), temp0 ));
      }

      IAsyncResult^ BeginAdd( String^ num1, String^ num2, AsyncCallback^ callback, Object^ asyncState )
      {
         array<Object^>^temp1 = {num1,num2};
         return this->BeginInvoke( "Add", String::Concat( this->Url, "/Add" ), temp1, callback, asyncState );
      }

      int EndAdd( IAsyncResult^ asyncResult )
      {
         return  *dynamic_cast<int^>(this->EndInvoke( asyncResult ));
      }
   };
}

namespace MyMath
{
    [XmlRootAttribute("int", Namespace = "http://MyMath/", IsNullable = false)]
    public class Math : HttpGetClientProtocol
    {
        public Math()
        {
            this.Url = "http://www.contoso.com/math.asmx";
        }

        [HttpMethodAttribute(typeof(System.Web.Services.Protocols.XmlReturnReader),
            typeof(System.Web.Services.Protocols.UrlParameterWriter))]
        public int Add(int num1, int num2)
        {
            return ((int)(this.Invoke("Add", ((this.Url) + ("/Add")),
                new object[] { num1, num2 })));
        }

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

        public int EndAdd(IAsyncResult asyncResult)
        {
            return ((int)(this.EndInvoke(asyncResult)));
        }
    }
}

Namespace MyMath
    <XmlRootAttribute("int", Namespace := "http://MyMath/", IsNullable := False)> _
    Public Class Math
        Inherits HttpGetClientProtocol
        
        Public Sub New()
            Me.Url = "http://www.contoso.com/math.asmx"
        End Sub
        
        <HttpMethodAttribute(GetType(XmlReturnReader), GetType(UrlParameterWriter))> _
        Public Function Add(num1 As String, num2 As String) As Integer
            Return CInt(Me.Invoke("Add", Me.Url + "/Add", New Object() {num1, num2}))
        End Function 'Add
        
        
        Public Function BeginAdd(num1 As String, num2 As String, callback As AsyncCallback, asyncState As Object) As IAsyncResult
            Return Me.BeginInvoke("Add", Me.Url + "/Add", New Object() {num1, num2}, callback, asyncState)
        End Function 'BeginAdd
        
        
        Public Function EndAdd(asyncResult As IAsyncResult) As Integer
            Return CInt(Me.EndInvoke(asyncResult))
        End Function 'EndAdd
    End Class
End Namespace 'MyMath

下面的代码示例是 Math XML Web 服务，从中创建了前面的代理类。

<%@ WebService Language="C#" Class="Math"%>
 using System.Web.Services;
 using System;
 
 public class Math {
      [ WebMethod ]
      public int Add(int num1, int num2) {
          return num1+num2;
          }
 }

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

Public Class Math
    <WebMethod()> _
    Public Function Add(num1 As Integer, num2 As Integer) As Integer
        Return num1 + num2
    End Function 'Add
End Class 'Math

注解

参数 methodName 用于查找参数的类型，并返回调用方法的方法的值 BeginInvoke 。它还用于查找可能已添加到方法的自定义属性。 SoapDocumentMethodAttribute、 SoapRpcMethodAttribute和 XmlElementAttribute 提供有关 HTTP 协议所需的派生方法的其他信息。

asyncState 传入 callback ，并包含在 IAsyncResult 从 BeginInvoke 方法返回的中。它将信息从异步调用的上下文传递到处理中的 callback异步结果时很有用。

适用于

另请参阅

IAsyncResult

HttpSimpleClientProtocol.BeginInvoke 方法

定义

参数

返回

例外

示例

注解

适用于

另请参阅

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