C# 动态载入Webservice的方法

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace EformWorkflow

{

public class ServiceClass

{

/// <summary>

/// 根据指定的信息，调用远程WebService方法

/// </summary>

/// <param name="url">WebService和Htt形式的地址</param>

/// <param name="namespace">欲调用的WebService的命名空间</param>

/// <param name="classname">欲调用的WebService的类名（不包括命名空间前缀）</param>

/// <param name="methodname">欲调用的WebService的方法名</param>

/// <param name="args">参数列表</param>

/// <returns>WebService的执行结果</returns>

/// <remarks>

/// 如果调用失败，将会抛出Exception。请调用的时候，适当截获异常。

/// 异常信息可能会发生在两个地方：

/// 1、动态构造WebService的时候，CompileAssembly失败。

/// 2、WebService本身执行失败。

/// </remarks>

/// <example>

/// <code>

/// object obj = InvokeWebService("http://192.168.2.37/SuperFormWS/WorkFlow/FuctionForFlow.asmx",

/// "SuperFormWS.WorkFlow", "FuctionForFlow", "Flow_CommondSignal", new object[]{"1"});

/// </code>

/// </example>

public static object InvokeWebservice(string url, string @namespace, string classname, string methodname, object[] args)

{

try

{

System.Net.WebClient wc = new System.Net.WebClient();

System.IO.Stream stream = wc.OpenRead(url + "?WSDL");

System.Web.Services.Description.ServiceDescription sd = System.Web.Services.Description.ServiceDescription.Read(stream);

System.Web.Services.Description.ServiceDescriptionImporter sdi = new System.Web.Services.Description.ServiceDescriptionImporter();

sdi.AddServiceDescription(sd, "", "");

System.CodeDom.CodeNamespace cn = new System.CodeDom.CodeNamespace(@namespace);

System.CodeDom.CodeCompileUnit ccu = new System.CodeDom.CodeCompileUnit();

ccu.Namespaces.Add(cn);

sdi.Import(cn, ccu);

Microsoft.CSharp.CSharpCodeProvider csc = new Microsoft.CSharp.CSharpCodeProvider();

System.CodeDom.Compiler.ICodeCompiler icc = csc.CreateCompiler();

System.CodeDom.Compiler.CompilerParameters cplist = new System.CodeDom.Compiler.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");

System.CodeDom.Compiler.CompilerResults cr = icc.CompileAssemblyFromDom(cplist, ccu);

if (true == cr.Errors.HasErrors)

{

System.Text.StringBuilder sb = new StringBuilder();

foreach (System.CodeDom.Compiler.CompilerError ce in cr.Errors)

{

sb.Append(ce.ToString());

sb.Append(System.Environment.NewLine);

}

throw new Exception(sb.ToString());

}

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));

}

}

}

}