一个WebService Demo

1.建立一个Asp.net Web网站，添加新项Web服务MyMath.asmx。编写如下代码：

 using System;
 using System.Collections.Generic;
 using System.Web;
 using System.Web.Services;

 /// <summary>
 ///MyMath 的摘要说明
 /// </summary>
 [WebService(Namespace = "http://tempuri.org/")]
 [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
 //若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
 // [System.Web.Script.Services.ScriptService]
 public class MyMath : System.Web.Services.WebService {

     public MyMath () {

         //如果使用设计的组件，请取消注释以下行
         //InitializeComponent();
     }

     [WebMethod]
     public string HelloWorld() {
         return "Hello World";
     }
     [WebMethod]
     public int Add(int num1, int num2)
     {
         return num1 + num2;
     }
 }

MyMath

2.使用wsdl.exe来生成客户端代理类的代码：

//------------------------------------------------------------------------------
// <auto-generated>
//     此代码由工具生成。
//     运行时版本:4.0.30319.1
//
//     对此文件的更改可能会导致不正确的行为，并且如果
//     重新生成代码，这些更改将会丢失。
// </auto-generated>
//------------------------------------------------------------------------------

using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Serialization;

//
// 此源代码由 wsdl 自动生成, Version=4.0.30319.1。
// 

/// <remarks/>
[System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Web.Services.WebServiceBindingAttribute(Name="MyMathSoap", Namespace="http://tempuri.org/")]
public partial class MyMath : System.Web.Services.Protocols.SoapHttpClientProtocol {

    private System.Threading.SendOrPostCallback HelloWorldOperationCompleted;

    private System.Threading.SendOrPostCallback AddOperationCompleted;

    /// <remarks/>
    public MyMath() {
        this.Url = "http://localhost:7594/MathWebService/MyMath.asmx";
    }

    /// <remarks/>
    public event HelloWorldCompletedEventHandler HelloWorldCompleted;

    /// <remarks/>
    public event AddCompletedEventHandler AddCompleted;

    /// <remarks/>
    [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/HelloWorld", RequestNamespace="http://tempuri.org/", ResponseNamespace="http://tempuri.org/", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)]
    public string HelloWorld() {
        object[] results = this.Invoke("HelloWorld", new object[]);
        return ((string)(results[]));
    }

    /// <remarks/>
    public System.IAsyncResult BeginHelloWorld(System.AsyncCallback callback, object asyncState) {
        return this.BeginInvoke("HelloWorld", new object[], callback, asyncState);
    }

    /// <remarks/>
    public string EndHelloWorld(System.IAsyncResult asyncResult) {
        object[] results = this.EndInvoke(asyncResult);
        return ((string)(results[]));
    }

    /// <remarks/>
    public void HelloWorldAsync() {
        this.HelloWorldAsync(null);
    }

    /// <remarks/>
    public void HelloWorldAsync(object userState) {
        if ((this.HelloWorldOperationCompleted == null)) {
            this.HelloWorldOperationCompleted = new System.Threading.SendOrPostCallback(this.OnHelloWorldOperationCompleted);
        }
        this.InvokeAsync("HelloWorld", new object[], this.HelloWorldOperationCompleted, userState);
    }

    private void OnHelloWorldOperationCompleted(object arg) {
        if ((this.HelloWorldCompleted != null)) {
            System.Web.Services.Protocols.InvokeCompletedEventArgs invokeArgs = ((System.Web.Services.Protocols.InvokeCompletedEventArgs)(arg));
            this.HelloWorldCompleted(this, new HelloWorldCompletedEventArgs(invokeArgs.Results, invokeArgs.Error, invokeArgs.Cancelled, invokeArgs.UserState));
        }
    }

    /// <remarks/>
    [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/Add", RequestNamespace="http://tempuri.org/", ResponseNamespace="http://tempuri.org/", 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[] {
                    num1,
                    num2});
        return ((int)(results[]));
    }

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

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

    /// <remarks/>
    public void AddAsync(int num1, int num2) {
        this.AddAsync(num1, num2, null);
    }

    /// <remarks/>
    public void AddAsync(int num1, int num2, object userState) {
        if ((this.AddOperationCompleted == null)) {
            this.AddOperationCompleted = new System.Threading.SendOrPostCallback(this.OnAddOperationCompleted);
        }
        this.InvokeAsync("Add", new object[] {
                    num1,
                    num2}, this.AddOperationCompleted, userState);
    }

    private void OnAddOperationCompleted(object arg) {
        if ((this.AddCompleted != null)) {
            System.Web.Services.Protocols.InvokeCompletedEventArgs invokeArgs = ((System.Web.Services.Protocols.InvokeCompletedEventArgs)(arg));
            this.AddCompleted(this, new AddCompletedEventArgs(invokeArgs.Results, invokeArgs.Error, invokeArgs.Cancelled, invokeArgs.UserState));
        }
    }

    /// <remarks/>
    public new void CancelAsync(object userState) {
        base.CancelAsync(userState);
    }
}

/// <remarks/>
[System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
public delegate void HelloWorldCompletedEventHandler(object sender, HelloWorldCompletedEventArgs e);

/// <remarks/>
[System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
public partial class HelloWorldCompletedEventArgs : System.ComponentModel.AsyncCompletedEventArgs {

    private object[] results;

    internal HelloWorldCompletedEventArgs(object[] results, System.Exception exception, bool cancelled, object userState) :
            base(exception, cancelled, userState) {
        this.results = results;
    }

    /// <remarks/>
    public string Result {
        get {
            this.RaiseExceptionIfNecessary();
            return ((string)(this.results[]));
        }
    }
}

/// <remarks/>
[System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
public delegate void AddCompletedEventHandler(object sender, AddCompletedEventArgs e);

/// <remarks/>
[System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "4.0.30319.1")]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
public partial class AddCompletedEventArgs : System.ComponentModel.AsyncCompletedEventArgs {

    private object[] results;

    internal AddCompletedEventArgs(object[] results, System.Exception exception, bool cancelled, object userState) :
            base(exception, cancelled, userState) {
        this.results = results;
    }

    /// <remarks/>
    public int Result {
        get {
            this.RaiseExceptionIfNecessary();
            return ((int)(this.results[]));
        }
    }
}

调用代码：

 private void button1_Click(object sender, EventArgs e)
        {
            MyMath math = new MyMath();
            math.Url = "http://localhost:7594/MathWebService/MyMath.asmx";
            int a = math.Add(, );
            MessageBox.Show(a.ToString());
        }

        private void button2_Click(object sender, EventArgs e)
        {
            MyMath math = new MyMath();
            math.Url = "http://localhost:7594/MathWebService/MyMath.asmx";
            string a = math.HelloWorld();
            MessageBox.Show(a.ToString());
        }

3.设置网站属性，生成网站，发布网站.

4.发表服务过程中报错误：

HTTP 错误 500.21 - Internal Server Error

处理程序“WebServiceHandlerFactory-Integrated”在其模块列表中有一个错误模块“ManagedPipelineHandler”

HTTP 错误 404.17 - Not Found

请求的内容似乎是脚本，因而将无法由静态文件处理程序来处理。

以管理员执行下面命令：

设置目录浏览为启动。

6. 服务访问界面：

查资料发现的一个查询天气服务：http://www.webservicex.net/globalweather.asmx