WebService – 2.动态调用WebService

在本节课程中，将演示如何通过程序动态添加、调用、编译、执行WebService并返回结果。

WebService动态调用示意图

WebService相关知识
代码文档对象模型CodeDom的使用
编程使用C#编译器
反射

1.先建动态调用辅助类 WebServiceHelper.cs

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.IO;
 using System.Configuration;
 using System.CodeDom;
 using System.CodeDom.Compiler;
 using System.Net;
 using System.Web.Services;
 using System.Web.Services.Description;
 using Microsoft.CSharp;

 namespace InvokeWebService
 {
     public static class WebServiceHelper
     {
         /// <summary>
         /// 动态调用WebService
         /// </summary>
         /// <param name="Url">WebService地址</param>
         /// <param name="methodname">WebService方法名（模块名）</param>
         /// <param name="args">调用接口的参数列表</param>
         /// <returns></returns>
         public static object InvokeWebService(string Url,string methodname,object[] args)
         {
             return InvokeWebService(Url, null, methodname, args);
         }

         /// <summary>
         /// 动态调用WebService
         /// </summary>
         /// <param name="Url">WebService地址</param>
         /// <param name="className">类名</param>
         /// <param name="methodname">WebService方法名</param>
         /// <param name="args">调用接口的参数列表</param>
         /// <returns></returns>
         public static object InvokeWebService(string Url, string className, string methodname, object[] args)
         {
             string @namespace = "ServiceBase.WebSerice.DynamicWebLoad";
             if (className == null || className == "")
             {
                 className = WebServiceHelper.GetClassName(Url);
             }
             //1.服务描述语言（WSDL）
             WebClient wc = new WebClient();
             Stream stream = wc.OpenRead(Url + "?WSDL");
             ServiceDescription sd = ServiceDescription.Read(stream);
             ServiceDescriptionImporter sdi = new ServiceDescriptionImporter();
             sdi.AddServiceDescription(sd, "", "");
             CodeNamespace cn = new CodeNamespace(@namespace);

             //2.生成客户端代理类代码
             CodeCompileUnit ccu = new CodeCompileUnit();
             ccu.Namespaces.Add(cn);
             sdi.Import(cn, ccu);
             CSharpCodeProvider csc = new CSharpCodeProvider();
             ICodeCompiler icc = csc.CreateCompiler();
             //3.设定编译器的参数
             CompilerParameters cplist = new CompilerParameters();
             cplist.GenerateExecutable=false;
             cplist.GenerateInMemory = true;
             cplist.ReferencedAssemblies.Add("System.dll");
             cplist.ReferencedAssemblies.Add("System.XML.dll");
             cplist.ReferencedAssemblies.Add("System.Web.Services.dll");
             cplist.ReferencedAssemblies.Add("System.Data.dll");
             //4.变异代理类
             CompilerResults cr = icc.CompileAssemblyFromDom(cplist, ccu);
             if (true==cr.Errors.HasErrors)
             {
                 System.Text.StringBuilder sb = new StringBuilder();
                 foreach (CompilerError ce in cr.Errors)
                 {
                     sb.Append(ce.ToString());
                     sb.Append(System.Environment.NewLine);
                 }
                 throw new Exception(sb.ToString());
             }
             //生成代理实例，并调用方法
             System.Reflection.Assembly assembly = cr.CompiledAssembly;
             Type t = assembly.GetType(@namespace + "." + className, true, true);
             object obj = Activator.CreateInstance(t);
             System.Reflection.MethodInfo mi = t.GetMethod(methodname);
             return mi.Invoke(obj, args);
         }

         //获取类名
         private static string GetClassName(string url)
         {
             string[] parts = url.Split('/');
             string[] pps = parts[parts.Length - ].Split('.');
             return pps[];
         }
     }
 }

WebServiceHelper.cs

2.建WebService，  Service1.asmx

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

 namespace InvokeServices
 {
     /// <summary>
     /// Service1 的摘要说明
     /// </summary>
     [WebService(Namespace = "http://tempuri.org/")]
     [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
     [System.ComponentModel.ToolboxItem(false)]
     // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消注释以下行。
     // [System.Web.Script.Services.ScriptService]
     public class Service1 : System.Web.Services.WebService
     {

         [WebMethod]
         public string HelloWorld(string Temp1,string Temp2)
         {
             return string.Format("参数1：{0},参数2：{1}", Temp1, Temp2);
         }
     }
 }

Service1.asmx

3.建应用程序

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;

 namespace Test
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         private void button1_Click(object sender, EventArgs e)
         {
             string url = "http://localhost:4547/Service1.asmx";
             string[] args = new string[];
             args[] = this.textBox1.Text;
             args[] = this.textBox2.Text;
             object result = InvokeWebService.WebServiceHelper.InvokeWebService(url, "HelloWorld", args);

             this.textBox3.Text = result.ToString();
         }
     }
 }

Form1.cs