C# 动态调用WebService

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

using System.IO;
using System.Net;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Web.Services.Description;
using System.Xml.Serialization;
using System.Web.Services.Discovery;
using System.Xml.Schema;
using System.Text;
using System.Security.Cryptography;
using System.Reflection;

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

    #region 私有变量和属性定义  
    /// <summary>                   
    /// web服务地址                           
    /// </summary>                              
    private string _wsdlUrl = string.Empty;
    /// <summary>                   
    /// web服务名称                           
    /// </summary>                              
    private string _wsdlName = string.Empty;
    /// <summary>                   
    /// 代理类命名空间                           
    /// </summary>                              
    private string _wsdlNamespace = "FrameWork.WebService.DynamicWebServiceCalling.{0}";
    /// <summary>                   
    /// 代理类类型名称                           
    /// </summary>                              
    private Type _typeName = null;
    /// <summary>                   
    /// 程序集名称                             
    /// </summary>                              
    private string _assName = string.Empty;
    /// <summary>                   
    /// 代理类所在程序集路径                            
    /// </summary>                              
    private string _assPath = string.Empty;
    /// <summary>                   
    /// 代理类的实例                            
    /// </summary>                              
    private object _instance = null;
    /// <summary>                   
    /// 代理类的实例                            
    /// </summary>                              
    private object Instance
    {
        get
        {
            if (_instance == null)
            {
                _instance = Activator.CreateInstance(_typeName);
                return _instance;
            }
            else
                return _instance;
        }
    }
    #endregion

    #region 构造函数  
    public WebServiceProxy(string wsdlUrl)
    {

        this._wsdlUrl = wsdlUrl;
        string wsdlName = WebServiceProxy.getWsclassName(wsdlUrl);
        this._wsdlName = wsdlName;
        this._assName = string.Format(_wsdlNamespace, wsdlName);
        this._assPath = Path.GetTempPath() + this._assName + getMd5Sum(this._wsdlUrl) + ".dll";
        this.CreateServiceAssembly();
    }

    public WebServiceProxy(string wsdlUrl, string wsdlName)
    {
        this._wsdlUrl = wsdlUrl;
        this._wsdlName = wsdlName;
        this._assName = string.Format(_wsdlNamespace, wsdlName);
        this._assPath = Path.GetTempPath() + this._assName + getMd5Sum(this._wsdlUrl) + ".dll";
        this.CreateServiceAssembly();
    }
    #endregion

    #region 得到WSDL信息，生成本地代理类并编译为DLL，构造函数调用，类生成时加载  
    /// <summary>                           
    /// 得到WSDL信息，生成本地代理类并编译为DLL                           
    /// </summary>                              
    private void CreateServiceAssembly()
    {
        if (this.checkCache())
        {
            this.initTypeName();
            return;
        }
        if (string.IsNullOrEmpty(this._wsdlUrl))
        {
            return;
        }
        try
        {
            //使用WebClient下载WSDL信息                         
            WebClient web = new WebClient();
            Stream stream = web.OpenRead(this._wsdlUrl);
            ServiceDescription description = ServiceDescription.Read(stream);//创建和格式化WSDL文档  
            ServiceDescriptionImporter importer = new ServiceDescriptionImporter();//创建客户端代理代理类  
            importer.ProtocolName = "Soap";
            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  
                                                                    //使用CodeDom编译客户端代理类                   
            CodeNamespace nmspace = new CodeNamespace(_assName);    //为代理类添加命名空间                  
            CodeCompileUnit unit = new CodeCompileUnit();
            unit.Namespaces.Add(nmspace);
            this.checkForImports(this._wsdlUrl, importer);
            ServiceDescriptionImportWarnings warning = importer.Import(nmspace, unit);
            CodeDomProvider provider = CodeDomProvider.CreateProvider("CSharp");
            CompilerParameters parameter = new CompilerParameters();
            parameter.ReferencedAssemblies.Add("System.dll");
            parameter.ReferencedAssemblies.Add("System.XML.dll");
            parameter.ReferencedAssemblies.Add("System.Web.Services.dll");
            parameter.ReferencedAssemblies.Add("System.Data.dll");
            parameter.GenerateExecutable = false;
            parameter.GenerateInMemory = false;
            parameter.IncludeDebugInformation = false;
            CompilerResults result = provider.CompileAssemblyFromDom(parameter, unit);
            provider.Dispose();
            if (result.Errors.HasErrors)
            {
                string errors = string.Format(@"编译错误:{0}错误！", result.Errors.Count);
                foreach (CompilerError error in result.Errors)
                {
                    errors += error.ErrorText;
                }
                throw new Exception(errors);
            }
            this.copyTempAssembly(result.PathToAssembly);
            this.initTypeName();
        }
        catch (Exception e)
        {
            throw new Exception(e.Message);
        }
    }
    #endregion

    #region 执行Web服务方法  
    /// <summary>                           
    /// 执行代理类指定方法，有返回值                                
    /// </summary>                                  
    /// <param   name="methodName">方法名称</param>                           
    /// <param   name="param">参数</param>                              
    /// <returns>object</returns>                                 
    public object ExecuteQuery(string methodName, object[] param)
    {
        object rtnObj = null;

        try
        {
            if (this._typeName == null)
            {
                //记录Web服务访问类名错误日志代码位置  
                throw new TypeLoadException("Web服务访问类名[" + this._wsdlName + "]不正确，请检查！");
            }
            //调用方法  
            MethodInfo mi = this._typeName.GetMethod(methodName);
            if (mi == null)
            {
                //记录Web服务方法名错误日志代码位置  
                throw new TypeLoadException("Web服务访问方法名[" + methodName + "]不正确，请检查！");
            }
            try
            {
                if (param == null)
                    rtnObj = mi.Invoke(Instance, null);
                else
                {
                    rtnObj = mi.Invoke(Instance, param);
                    //rtnObj = mi.Invoke(Instance, new object[] { param });  
                }
            }
            catch (TypeLoadException tle)
            {
                //记录Web服务方法参数个数错误日志代码位置  
                throw new TypeLoadException("Web服务访问方法【" + methodName + "】参数个数不正确，请检查！", 
                    new TypeLoadException(tle.StackTrace));
            }
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message, new Exception(ex.StackTrace));
        }
        return rtnObj;
    }

    /// <summary>                           
    /// 执行代理类指定方法，无返回值                                
    /// </summary>                                  
    /// <param   name="methodName">方法名称</param>                           
    /// <param   name="param">参数</param>                              
    public void ExecuteNoQuery(string methodName, object[] param)
    {
        try
        {
            if (this._typeName == null)
            {
                //记录Web服务访问类名错误日志代码位置  
                throw new TypeLoadException("Web服务访问类名[" + this._wsdlName + "]不正确，请检查！");
            }
            //调用方法  
            MethodInfo mi = this._typeName.GetMethod(methodName);
            if (mi == null)
            {
                //记录Web服务方法名错误日志代码位置  
                throw new TypeLoadException("Web服务访问方法名[" + methodName + "]不正确，请检查！");
            }
            try
            {
                if (param == null)
                    mi.Invoke(Instance, null);
                else
                    mi.Invoke(Instance, param);
            }
            catch (TypeLoadException tle)
            {
                //记录Web服务方法参数个数错误日志代码位置  
                throw new TypeLoadException("Web服务访问方法[" + methodName + "]参数个数不正确，请检查！", 
                    new TypeLoadException(tle.StackTrace));
            }
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message, new Exception(ex.StackTrace));
        }
    }
    #endregion

    #region 私有方法  
    /// <summary>                               
    /// 得到代理类类型名称                                 
    /// </summary>                                  
    private void initTypeName()
    {
        Assembly serviceAsm = Assembly.LoadFrom(this._assPath);
        Type[] types = serviceAsm.GetTypes();
        string objTypeName = "";
        foreach (Type t in types)
        {
            if (t.BaseType == typeof(SoapHttpClientProtocol))
            {
                objTypeName = t.Name;
                break;
            }
        }
        _typeName = serviceAsm.GetType(this._assName + "." + objTypeName);
    }

    /// <summary>                       
    /// 根据web service文档架构向代理类添加ServiceDescription和XmlSchema                             
    /// </summary>                                  
    /// <param   name="baseWSDLUrl">web服务地址</param>                           
    /// <param   name="importer">代理类</param>                              
    private void checkForImports(string baseWsdlUrl, ServiceDescriptionImporter importer)
    {
        DiscoveryClientProtocol dcp = new DiscoveryClientProtocol();
        dcp.DiscoverAny(baseWsdlUrl);
        dcp.ResolveAll();
        foreach (object osd in dcp.Documents.Values)
        {
            if (osd is ServiceDescription) importer.AddServiceDescription((ServiceDescription)osd, null, null); ;
            if (osd is XmlSchema) importer.Schemas.Add((XmlSchema)osd);
        }
    }

    /// <summary>                           
    /// 复制程序集到指定路径                                
    /// </summary>                                  
    /// <param   name="pathToAssembly">程序集路径</param>                              
    private void copyTempAssembly(string pathToAssembly)
    {
        File.Copy(pathToAssembly, this._assPath);
    }

    private string getMd5Sum(string str)
    {
        Encoder enc = System.Text.Encoding.Unicode.GetEncoder();
        byte[] unicodeText = new byte[str.Length * 2];
        enc.GetBytes(str.ToCharArray(), 0, str.Length, unicodeText, 0, true);
        MD5 md5 = new MD5CryptoServiceProvider();
        byte[] result = md5.ComputeHash(unicodeText);
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < result.Length; i++)
        {
            sb.Append(result[i].ToString("X2"));
        }
        return sb.ToString();
    }

    /// <summary>                           
    /// 是否已经存在该程序集                                
    /// </summary>                                  
    /// <returns>false:不存在该程序集,true:已经存在该程序集</returns>                                
    private bool checkCache()
    {
        if (File.Exists(this._assPath))
        {
            return true;
        }
        return false;
    }

    //私有方法，默认取url入口的文件名为类名  
    private static string getWsclassName(string wsdlUrl)
    {
        string[] parts = wsdlUrl.Split('/');
        string[] pps = parts[parts.Length - 1].Split('.');
        return pps[0];
    }
    #endregion
}