HttpSimpleClientProtocol.BeginInvoke 方法

定義

命名空間:: System.Web.Services.Protocols

組件:: System.Web.Services.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

啟動非同步呼叫 XML Web 服務的方法。

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

參數

methodName: String

XML Web 服務方法的名稱。

requestUrl: String

建立 WebRequest.

parameters: Object[]

一組物件陣列，包含要傳遞給 XML Web 服務方法的參數。陣列中值的順序對應於導出類別呼叫方法中參數的順序。

callback: AsyncCallback

當非同步方法呼叫完成時，委派呼叫。若 callback ， null則不叫代表。

asyncState: Object

客戶提供的額外資訊。

傳回

IAsyncResult

IAsyncResult可以傳遞給EndInvoke(IAsyncResult)方法，從 XML Web 服務方法取得回傳值。

例外狀況

Exception

請求已抵達伺服器電腦，但未被成功處理。

範例

以下程式碼範例是一個 ASP.NET 網頁表單，呼叫一個名為 Math 的 XML Web 服務。在函式中 EnterBtn_Click ，網頁表單會啟動並完成 XML Web 服務方法的非同步呼叫 Add 。

<%@ 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>

以下程式碼範例是由 Web Services Description Language 工具（Wsdl.exe） Math 為下方 XML Web 服務產生的代理類別。在代理類別的方法中 BeginAdd ，該 BeginInvoke 方法會開始非同步呼叫 Add XML Web 服務方法。

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

以下程式碼範例是 Math XML Web 服務，前述代理類別即由此產生。

<%@ 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

備註

參數 methodName 用來找出呼叫 BeginInvoke 該方法的方法的參數類型及回傳值。它也用來尋找可能被加入方法的自訂屬性。 SoapDocumentMethodAttribute、 SoapRpcMethodAttribute，並提供 XmlElementAttribute HTTP 協定所需的導出方法的額外資訊。

asyncState 傳遞到 callback 並包含在 IAsyncResult 從方法回 BeginInvoke 傳的中。它對於將非同步呼叫的資訊傳遞到處理非 callback同步結果時非常有用。

適用於

另請參閱

IAsyncResult

意見反應

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