C# 动态调用WebService

public static object InvokeWebService(string url, string methodname, object[] args)
//其中，url是Web服务的地址，methodname是要调用服务方法名，args是要调用Web服务所需的参数，返回值就是web服务返回的结果了。

要实现这样的功能，你需要这几个方面的技能：反射、CodeDom、编程使用C#编译器、WebService。在了解这些知识后，就可以容易的实现web服务的动态调用了：

#region InvokeWebService
//动态调用web服务
public static object InvokeWebService(string url, string methodname, object[] args)

{
return WebServiceHelper.InvokeWebService(url ,null ,methodname ,args) ;
}

public static object InvokeWebService(string url, string classname, string methodname, object[] args)

{
string @namespace = "EnterpriseServerBase.WebService.DynamicWebCalling" ; //命名空间
if((classname == null) ||(classname == ""))
{
classname = WebServiceHelper.GetWsClassName(url) ;
}

try
{
//获取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);

//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();

//设定编译参数
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");

//编译代理类
CompilerResults cr = icc.CompileAssemblyFromDom(cplist, ccu);
if(true == cr.Errors.HasErrors)
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
foreach(System.CodeDom.Compiler.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);
}
catch(Exception ex)
{
throw new Exception(ex.InnerException.Message,new Exception(ex.InnerException.StackTrace));
}
}

private static string GetWsClassName(string wsUrl)
{
string[] parts = wsUrl.Split('/') ;
string[] pps = parts[parts.Length-1].Split('.') ;

return pps[0] ;
}
#endregion

string url = "http://www.webservicex.net/globalweather.asmx" ;

string[] args = new string[2] ;

args[0] = this.textBox_CityName.Text ;

args[1] = "China" ;

object result = WebServiceHelper.InvokeWebService(url ,"GetWeather" ,args) ;

this.label_Result.Text = result.ToString() ;