.NET 下动态设置 WebService 引用

using System;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;

[WebService(Namespace = " http://tempuri.org/ " )]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Service : System.Web.Services.WebService
{
???? public Service () {

???????? // Uncomment the following line if using designed components
???????? // InitializeComponent();
????}

????[WebMethod]
???? public int Sum( int a, int b)
????{
???????? int c = a + b;

???????? return c;
????}
????
}

?WSDL.exe 命令行为：wsdl /n:namespace1 /out:c:/service1.cs http://localhost/WebServiceHTTP/Service.asmx?WSDL
生成的代理文件内容为：

// ------------------------------------------------------------------------------
// <auto-generated>
// ???? This code was generated by a tool.
// ???? Runtime Version:2.0.50727.1433
//
// ???? Changes to this file may cause incorrect behavior and will be lost if
// ???? the code is regenerated.
// </auto-generated>
// ------------------------------------------------------------------------------

//
// This source code was auto-generated by wsdl,Version=2.0.50727.1432.
//
namespace namespace1 {
???? using System.Diagnostics;
???? using System.Web.Services;
???? using System.ComponentModel;
???? using System.Web.Services.Protocols;
???? using System;
???? using System.Xml.Serialization;
????
????
???? /// <remarks/>
????[System.CodeDom.Compiler.GeneratedCodeAttribute( " wsdl " , " 2.0.50727.1432 " )]
????[System.Diagnostics.DebuggerStepThroughAttribute()]
????[System.ComponentModel.DesignerCategoryAttribute( " code " )]
????[System.Web.Services.WebServiceBindingAttribute(Name = " ServiceSoap " ,Namespace = " http://tempuri.org/ " )]
???? public partial class Service : System.Web.Services.Protocols.SoapHttpClientProtocol {
????????
???????? private System.Threading.SendOrPostCallback SumOperationCompleted;
????????
???????? /// <remarks/>
???????? public Service() {
???????????? this .Url = " http://localhost/WebServiceHTTP/Service.asmx " ;
????????}
????????
???????? /// <remarks/>
???????? public event SumCompletedEventHandler SumCompleted;
????????
???????? /// <remarks/>
????????[System.Web.Services.Protocols.SoapDocumentMethodAttribute( " http://tempuri.org/Sum " ,RequestNamespace = " http://tempuri.org/ " ,ResponseNamespace = " http://tempuri.org/ " ,Use = System.Web.Services.Description.SoapBindingUse.Literal,ParameterStyle = System.Web.Services.Protocols.SoapParameterStyle.Wrapped)]
???????? public int Sum( int a, int b) {
???????????? object [] results = this .Invoke( " Sum " , new object [] {
????????????????????????a,
????????????????????????b});
???????????? return (( int )(results[ 0 ]));
????????}?
?????????//还有很多...

然后把构造方法中的 this .Url = " http://localhost/WebServiceHTTP/Service.asmx " ; 在app.config中配置即可。

this.Url =?ConfigurationManager.AppSettings.Get("service1");?

<? xml version="1.0" encoding="utf-8" ?>
< configuration >
?? < appSettings >
???? < add key ="service1" value ="http://localhost/WebServiceHTTP/Service.asmx" /> ?? </ appSettings >
</ configuration >

这样做有个缺点，就是每次修改 WebService后都要重新生成一遍，设置URL。可以调试的时候直接用VS引用，完成后手工引用即可。也可写一个批处理生成代理。也可以再写一个代理，派生自WSDL.exe生成的代理，把URL以参数的形式传到WSDL.exe生成的代理。
WSDL.exe的使用方法可参考：http://msdn2.microsoft.com/en-us/library/7h3ystb6(VS.80).aspx