动态调用WebService
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using System.Web.Services.Description;
using System.Xml.Serialization;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Reflection;
namespace ClassLibrary1
{
/// <summary>
///动态调用WebService
/// </summary>
public class DynamicCallWebService
{
/// <summary>
/// 动态调用WebService,并自动更新WebService
/// </summary>
/// <param name="WebServiceURL">WebService地址(必填项)如：http://10.192.56.81:8085/TestWebService.asmx,注意：TestWebService有大小写之分</param>
/// <param name="AgentClassName">代理类的名称，可以为空</param>
/// <param name="MethodName">需要调用的方法名(必填项)</param>
/// <param name="Parameters">调用方法的时候的参数列表,可以为空</param>
/// <param name="Timeout">调用WebService超时设置，单位为毫秒,可以为空，默认为60000,即为1分钟</param>
/// <param name="DllPath">代理类生成的程序集的路径(必填项)</param>
/// <param name="ErrorMsg">错误消息</param>
/// <returns></returns>
public static object CallWebService(string WebServiceURL, string AgentClassName, string MethodName, object[] Parameters, string Timeout, string DllPath, out string ErrorMsg)
{
object Result = null;
ErrorMsg = "";
try
{
if (WebServiceURL == null || WebServiceURL == "")
{
ErrorMsg = "WebServiceURL不能为空！";
return null;
}
if (MethodName == null || MethodName == "")
{
ErrorMsg = "MethodName不能为空！";
return null;
}
//if (DllName == null || DllName == "")
//{
// ErrorMsg = "DllName不能为空！";
// return null;
//}
if (DllPath == null || DllPath == "")
{
ErrorMsg = "DllPath不能为空！";
return null;
}
if (Timeout == null || Timeout == "")
{
Timeout = "60000";//默认为1分钟
}
WebServiceURL = WebServiceURL.Trim();
string TempStr = WebServiceURL.Substring(WebServiceURL.Length - 5).Trim().ToLower();
if (TempStr != "?wsdl")
{
WebServiceURL = WebServiceURL "?wsdl";
}
//if (DllName == null || DllName == "")
//{
// DllName = "WebService_DynamicCall.dll";
//}
if (DllPath.Substring(DllPath.Length - 2) != @"\")
{
DllPath = DllPath @"\WebServiceDllFolder\";
}
else
{
DllPath = DllPath @"WebServiceDllFolder\";
}
string DllName = "";
DllName = GetDllName(DllPath);
if (DllName == "")
{
DllName = "WebService_DynamicCall_1.dll";
}
if (File.Exists(DllPath DllName) == true)//此代理类生成的Dll是否存在？
{
Assembly asm = Assembly.LoadFrom(DllPath DllName);//加载前面生成的程序集
Type[] ClassArray = asm.GetTypes();//获取此dll下的所有类
if (AgentClassName == null || AgentClassName == "")
{
AgentClassName = ClassArray[0].Name;//一般第一个类就是此WebSrvice的类名
}
else
{
bool Flag = false;
for (int i = 0; i < ClassArray.Length; i )
{
if (ClassArray[i].Name.ToLower() == AgentClassName.Trim().ToLower())
{
Flag = true;
break;
}
}
if (Flag == false)
{
ErrorMsg = DllName "下没有此类： " AgentClassName;
return null;
}
}
Result = ExecMethod(asm, WebServiceURL, AgentClassName, MethodName, Parameters, Convert.ToInt32(Timeout), DllName, DllPath, true, out ErrorMsg);
}
else//第一次调用，得生成代理类
{
OutputAssembly(WebServiceURL, Convert.ToInt32(Timeout), DllName, DllPath, out ErrorMsg);
Assembly asm = Assembly.LoadFrom(DllPath DllName);//加载前面生成的程序集
Type[] ClassArray = asm.GetTypes();//获取此dll下的所有类
if (AgentClassName == null || AgentClassName == "")
{
AgentClassName = ClassArray[0].Name;//一般第一个类就是此WebSrvice的类名
}
Result = ExecMethod(asm, WebServiceURL, AgentClassName, MethodName, Parameters, Convert.ToInt32(Timeout), DllName, DllPath, false, out ErrorMsg);
}
}
catch (Exception ex)
{
ErrorMsg = ex.Message "; " ex.StackTrace;
}
return Result;
}
private static string GetDllName(string DllPath)
{
string DllName = "";
System.Collections.Hashtable ht = new System.Collections.Hashtable();
List<int> DllNum = new List<int>();
if (System.IO.Directory.Exists(DllPath) == false)
{
System.IO.Directory.CreateDirectory(DllPath);
}
string[] Files = System.IO.Directory.GetFiles(DllPath);
for (int i = 0; i < Files.Length; i )
{
if (Files[i].ToLower().IndexOf("webservice_dynamiccall") != -1)
{
string TempStr = Files[i].Substring(Files[i].LastIndexOf("_") 1);
TempStr = TempStr.Substring(0, TempStr.LastIndexOf(".dll"));
int temp = Convert.ToInt32(TempStr);
DllNum.Add(temp);
ht.Add(temp, Files[i].Substring(Files[i].LastIndexOf("\\") 1));
}
}
if (DllNum.Count != 0)
{
DllNum.Sort();
DllName = ht[DllNum[DllNum.Count - 1]].ToString();//取出最新的Dll
}
return DllName;
}
private static object ExecMethod(Assembly asm, string WebServiceURL, string AgentClassName, string MethodName, object[] Parameters, int Timeout, string DllName, string DllPath, bool IsUpdWebService, out string ErrorMsg)
{
ErrorMsg = "";
object Result = null;
Type t = asm.GetType("mydynamiccallwebservice." AgentClassName);
object o = Activator.CreateInstance(t);
MethodInfo method = t.GetMethod(MethodName);//GetPersons是服务端的方法名称
if (method == null)
{
if (IsUpdWebService == true)//动态更新WebService
{
// File.Delete(DllPath);//先删除此dll
string TempStr = DllName.Substring(DllName.LastIndexOf("_") 1);
TempStr = TempStr.Substring(0, TempStr.LastIndexOf(".dll"));
int DllMaxNum = Convert.ToInt32(TempStr);
//给10次机会生成dll,如果还是调用不到的话，那么就代表这“方法名”在WebService里面已去除了
if (DllMaxNum==10)
{
ErrorMsg = "没有此方法：" method "，请重新设置方法名；注意：请把此文件夹：" DllPath " 下面自动生成dll都删除，如果删除不了，先停了这些dll所在的宿主(比如IIS,或者当前的应用程序等)再删除此dll,不然有可能是被这宿主占用了资源删除不了！";
return null;
}
DllName = "webservice_dynamiccall_" ( DllMaxNum).ToString() ".dll";//原来的那个dll没法删除，因为占用了资源，没法释放资源，只有垃圾回收站释放资源了，但是又得要更新些Dll，所以重新生成另一个新的dll
//如果method为null,那么只有两种可能：1.此类下没有此方法 2.服务器那边WebSrvice添加了新的方法，此代理类没有更新
//所以这里处理是：第一次method为null,那么给一次机会，用下面的方法"OutputAssembly"重新更新下WebService，并重新生成dll文件
OutputAssembly(WebServiceURL, Timeout, DllName, DllPath, out ErrorMsg);
if (ErrorMsg != "")//代表出错了
{
return null;
}
//重新加载新的dll
asm = Assembly.LoadFrom(DllPath DllName);
t = asm.GetType("mydynamiccallwebservice." AgentClassName);
o = Activator.CreateInstance(t);
method = t.GetMethod(MethodName);
}
//如果method还为null,那么则"MethodName"则真是错误了
if (method == null)
{
ErrorMsg = "没有此方法： " MethodName;
return null;
}
}
try
{
//注：method.Invoke(o, null)返回的是一个Object,如果你服务端返回的是DataSet,这里也是用(DataSet)method.Invoke(o, null)转一下就行了
Result = method.Invoke(o, Parameters);
}
catch (Exception)
{
ErrorMsg = "参数有错误：Parameters";
}
return Result;
}
private static void OutputAssembly(string WebServiceURL, int Timeout, string DllName, string DllPath, out string ErrorMsg)
{
ErrorMsg = "";
try
{
HttpWebRequest client = (HttpWebRequest)HttpWebRequest.Create(WebServiceURL);
client.Timeout = Timeout;
Stream stream = ((HttpWebResponse)client.GetResponse()).GetResponseStream();
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 = "mydynamiccallwebservice";
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 = DllName;//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
ErrorMsg = "动态编绎：\"" DllName "\"有错误！";
}
File.Copy(AppDomain.CurrentDomain.BaseDirectory DllName, DllPath DllName);
File.Delete(AppDomain.CurrentDomain.BaseDirectory DllName);
}
catch (Exception ex)
{
ErrorMsg = "创建代理类并动态生成Dll出错：" ex.Message "; " ex.StackTrace;
}
}
}
}
评论