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C# 动态调用Webservice

通常我们在程序中需要调用WebService时,都是通过“添加Web引用”,让VS.NET环境来为我们生成服务代理,然后调用对应的Web服务。这样是使工作简单了,但是却和提供Web服务的URL、方法名、参数绑定在一起了,这是VS.NET自动为我们生成Web服务代理的限制。如果哪一天发布Web服务的URL改变了,则我们需要重新让VS.NET生成代理,并重新编译。在某些情况下,这可能是不能忍受的,我们需要动态调用WebService的能力。比如我们可以把Web服务的URL保存在配置文件中,这样,当服务URL改变时,只需要修改配置文件就可以了

参考

用C#通过反射实现动态调用WebService 告别Web引用

动态调用WebService(C#)

public class WebServiceHelper     {               /// <summary>         /// 动态调用web服务         /// </summary>         /// <param name="url">url 网址</param>         /// <param name="methodname">方法名</param>         /// <param name="args">参数</param>         /// <returns></returns>         public static object InvokeWebServiceDynamic(string url, string methodname, object[] args)         {             return InvokeWebService(url, string.Empty, methodname, args);         }          public static object InvokeWebService(string url, string classname, string methodname, object[] args)         {             string @namespace = "EnterpriseServerBase.WebService.DynamicWebCalling";             if ((classname == null) || (classname == ""))             {                 classname = WebServiceHelper.GetWsClassName(url);             }             try             {                 InstanceInfo instance = GetInstanceInfo(@namespace, classname, methodname);                 if (instance != null)                 {                     return instance.InstanceMethod.Invoke(instance.Instance, args);                 }                 //获取WSDL                 WebClient wc = new WebClient();                  Stream stream = wc.OpenRead(url + "?WSDL");                 ServiceDescription sd = ServiceDescription.Read(stream);                 wc.Dispose();                 stream.Close();                 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();                 csc.Dispose();                 //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);                 CompilerResults cr = csc.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);                 InstanceInfo newInstance = new InstanceInfo()                 {                     ClassName = classname,                     MethodName = methodname,                     NameSpace = @namespace,                     InstanceType = t,                     InstanceMethod = mi,                     Instance = obj                 };                 _curInstanceInfo.Add(newInstance);                  return mi.Invoke(obj, args);              }             catch (Exception ex)             {                 throw new Exception(ex.InnerException.Message, new Exception(ex.InnerException.StackTrace));             }         }          private static List<InstanceInfo> _curInstanceInfo = new List<InstanceInfo>();          private static InstanceInfo GetInstanceInfo(string nameSpace, string className, string methodName)         {             if (_curInstanceInfo.Exists(i => i.ClassName.Equals(className) && i.NameSpace.Equals(nameSpace) && i.MethodName.Equals(methodName)))             {                 return                     _curInstanceInfo.FirstOrDefault(                         i =>                             i.ClassName.Equals(className) && i.NameSpace.Equals(nameSpace) &&                             i.MethodName.Equals(methodName));             }             else             {                 return null;             }         }          private static string GetWsClassName(string wsUrl)         {             string[] parts = wsUrl.Split('/');             string[] pps = parts[parts.Length - 1].Split('.');              return pps[0];         }      }     public class InstanceInfo     {         /// <summary>         /// 命名空间         /// </summary>         public string NameSpace { get; set; }         /// <summary>         /// 类名         /// </summary>         public string ClassName { get; set; }         /// <summary>         /// 方法名         /// </summary>         public string MethodName { get; set; }          /// <summary>         /// 实例类型         /// </summary>         public Type InstanceType { get; set; }         /// <summary>         /// 需要调用的方法         /// </summary>         public System.Reflection.MethodInfo InstanceMethod { get; set; }          public object Instance { get; set; }     }

调用

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() ;

 

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