动态调用WebService方法

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using System.CodeDom.Compiler;
using System.Reflection;
using System.Web.Services.Description;
using System.Xml.Serialization;
using System.CodeDom;

namespace CN100.Member.Utility
{
    public class WebServiceHelper
    {
        private static WebServiceHelper webService = null;

        public static WebServiceHelper Instance(string webServiceUrl, string NamSpace)
        {
            if (webService == null)
            {
                webService = new WebServiceHelper(webServiceUrl, NamSpace);
            }
            return webService;
        }

        private WebServiceHelper()
        {

        }

        /// <summary>
        /// webService地址
        /// </summary>
        public string ServerUrl
        {
            get;
            set;
        }

        /// <summary>
        /// 调用类命名空间
        /// </summary>
        public string NameSpace
        {
            get;
            set;
        }

        private WebServiceHelper(string webServiceUrl, string namSpace)
        {
            ServerUrl = webServiceUrl;
            NameSpace = namSpace;
        }

        /// <summary>
        /// 生成动态引用DLL
        /// </summary>
        /// <returns></returns>
        public bool GenerateWebService()
        {
            WebClient client = new WebClient();
            String url = ServerUrl + "?WSDL";//这个地址可以写在Config文件里面，这里取出来就行了.在原地址后面加上： ?WSDL
            Stream stream = client.OpenRead(url);
            ServiceDescription description = ServiceDescription.Read(stream);
            ServiceDescriptionImporter importer = new ServiceDescriptionImporter();//创建客户端代理代理类。
            importer.ProtocolName = "Soap"; //指定访问协议。
            importer.Style = ServiceDescriptionImportStyle.Client; //生成客户端代理。
            importer.CodeGenerationOptions = CodeGenerationOptions.GenerateProperties | CodeGenerationOptions.GenerateNewAsync;
            importer.AddServiceDescription(description, null, null); //添加WSDL文档。
            CodeNamespace nmspace = new CodeNamespace(); //命名空间
            nmspace.Name = NameSpace;
            CodeCompileUnit unit = new CodeCompileUnit();
            unit.Namespaces.Add(nmspace);

            ServiceDescriptionImportWarnings warning = importer.Import(nmspace, unit);
            CodeDomProvider provider = CodeDomProvider.CreateProvider("CSharp");

            CompilerParameters parameter = new CompilerParameters();
            parameter.GenerateExecutable = false;
            parameter.OutputAssembly = NameSpace + ".dll";//输出程序集的名称
            parameter.ReferencedAssemblies.Add("System.dll");
            parameter.ReferencedAssemblies.Add("System.XML.dll");
            parameter.ReferencedAssemblies.Add("System.Web.Services.dll");
            parameter.ReferencedAssemblies.Add("System.Data.dll");

            CompilerResults result = provider.CompileAssemblyFromDom(parameter, unit);
            if (result.Errors.HasErrors)
            {
                // 显示编译错误信息
                return false;
            }
            return true;
        }

        private Assembly LoadAssembly(string nameSpace)
        {
            Assembly asm = null;
            try
            {
                asm=Assembly.LoadFrom(nameSpace + ".dll");//加载前面生成的程序集
            }
            catch (FileNotFoundException ex)
            {
                if (GenerateWebService())
                {
                    asm=Assembly.LoadFrom(nameSpace + ".dll");//加载前面生成的程序集
                }
            }
            catch (Exception e)
            {
                throw e;
            }
            return asm;
        }

        /// <summary>
        /// 执行无返回值方法
        /// </summary>
        /// <param name="methodName"></param>
        /// <param name="nameSpace"></param>
        /// <param name="args"></param>
        public void ExcuteMethod(string methodName,string nameSpace,object[] args)
        {
            Assembly asm = LoadAssembly(nameSpace);
            Type t = asm.GetType(nameSpace);
            object o = Activator.CreateInstance(t);
            MethodInfo method = t.GetMethod(methodName);
            method.Invoke(o, args);
        }

        public void ExcuteMethod(string methodName, object[] args)
        {
            string nameSpace = NameSpace;
            ExcuteMethod(methodName, nameSpace, args);
        }

        /// <summary>
        /// 执行带返回值方法
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="methodName"></param>
        /// <param name="nameSpace"></param>
        /// <param name="args"></param>
        /// <returns></returns>
        public T ExcuteMethod<T>(string methodName, string nameSpace, object[] args)
        {
            Assembly asm = LoadAssembly(nameSpace);
            Type t = asm.GetType(nameSpace);
            object o = Activator.CreateInstance(t);
            MethodInfo method = t.GetMethod(methodName);
            T result = (T)method.Invoke(o, args);
            return result;
        }

        public T ExcuteMethod<T>(string methodName, object[] args)
        {
            string nameSpace=NameSpace;
            return ExcuteMethod<T>(methodName, nameSpace, args);
        }

    }
}

 

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