动态调用webservice时提示找不到函数
我需要动态可修改webservice地址的方式调用一个webservice
目前是引用http://121.52.210.226/Services/EcgWebService.asmx这个webservice
我所用的代理类是下面贴的这个类，namespace需要自己另外修改
引用代理类的方式如下
WebServiceInvoker invoker;invoker = new WebServiceInvoker(new Uri(webservice));object[] args = new object[] { (object)ecgId, (object)data, (object)sampleRate, (object)adBit, (object)adRange, (object)uVpb, (object)amp, (object)seconds, (object)filter, (object)deviceSn, (object)clientType, (object)alias, (object)patientName, (object)patientAge,(object)patientSex };bool result = invoker.InvokeMethod<bool>("EcgWebService", "SaveEcgData", args);[code=C#]现在碰到一个奇怪的错误，我之前的一个程序调用这个webservice的SaveEcgData函数是正常的。现在手头的程序调用webservice的SaveEcgData函数时，抛出异常，提示找不到这个方法。而我用代理类中的public List<string> EnumerateServiceMethods(string serviceName)方法列举函数列表时列表里是肯定包含有SaveEcgData函数的。碰到这个问题很奇怪，我很难解释原因，请问这个找不到方法，是因为什么原因？代理类[code=C#]using System;using System.Collections.Generic;using System.Text;using System.Reflection;using System.Xml;using System.Web.Services.Description;using Microsoft.CSharp;using System.CodeDom.Compiler;using System.CodeDom;namespace TestClient{ class WebServiceInvoker { Dictionary<string, Type> availableTypes; /// <summary> /// Text description of the available services within this web service. /// </summary> public List<string> AvailableServices { get { return this.services; } } /// <summary> /// Creates the service invoker using the specified web service. /// </summary> /// <param name="webServiceUri"></param> public WebServiceInvoker(Uri webServiceUri) { this.services = new List<string>(); // available services this.availableTypes = new Dictionary<string, Type>(); // available types // create an assembly from the web service description this.webServiceAssembly = BuildAssemblyFromWSDL(webServiceUri); // see what service types are available Type[] types = this.webServiceAssembly.GetExportedTypes(); // and save them foreach (Type type in types) { services.Add(type.FullName); availableTypes.Add(type.FullName, type); } } /// <summary> /// Gets a list of all methods available for the specified service. /// </summary> /// <param name="serviceName"></param> /// <returns></returns> public List<string> EnumerateServiceMethods(string serviceName) { List<string> methods = new List<string>(); if (!this.availableTypes.ContainsKey(serviceName)) throw new Exception("Service Not Available"); else { Type type = this.availableTypes[serviceName]; // only find methods of this object type (the one we generated) // we don't want inherited members (this type inherited from SoapHttpClientProtocol) foreach (MethodInfo minfo in type.GetMethods(BindingFlags.Instance | BindingFlags.Public | BindingFlags.DeclaredOnly)) methods.Add(minfo.Name); return methods; } } /// <summary> /// Invokes the specified method of the named service. /// </summary> /// <typeparam name="T">The expected return type.</typeparam> /// <param name="serviceName">The name of the service to use.</param> /// <param name="methodName">The name of the method to call.</param> /// <param name="args">The arguments to the method.</param> /// <returns>The return value from the web service method.</returns> public T InvokeMethod<T>(string serviceName, string methodName, params object[] args) { // create an instance of the specified service // and invoke the method object obj = this.webServiceAssembly.CreateInstance(serviceName); Type type = obj.GetType(); return (T)type.InvokeMember(methodName, BindingFlags.InvokeMethod, null, obj, args); } /// <summary> /// Builds the web service description importer, which allows us to generate a proxy class based on the /// content of the WSDL described by the XmlTextReader. /// </summary> /// <param name="xmlreader">The WSDL content, described by XML.</param> /// <returns>A ServiceDescriptionImporter that can be used to create a proxy class.</returns> private ServiceDescriptionImporter BuildServiceDescriptionImporter(XmlTextReader xmlreader) { // make sure xml describes a valid wsdl if (!ServiceDescription.CanRead(xmlreader)) throw new Exception("Invalid Web Service Description"); // parse wsdl ServiceDescription serviceDescription = ServiceDescription.Read(xmlreader); // build an importer, that assumes the SOAP protocol, client binding, and generates properties ServiceDescriptionImporter descriptionImporter = new ServiceDescriptionImporter(); descriptionImporter.ProtocolName = "Soap"; descriptionImporter.AddServiceDescription(serviceDescription, null, null); descriptionImporter.Style = ServiceDescriptionImportStyle.Client; descriptionImporter.CodeGenerationOptions = System.Xml.Serialization.CodeGenerationOptions.GenerateProperties; return descriptionImporter; } /// <summary> /// Compiles an assembly from the proxy class provided by the ServiceDescriptionImporter. /// </summary> /// <param name="descriptionImporter"></param> /// <returns>An assembly that can be used to execute the web service methods.</returns> private Assembly CompileAssembly(ServiceDescriptionImporter descriptionImporter) { // a namespace and compile unit are needed by importer CodeNamespace codeNamespace = new CodeNamespace(); CodeCompileUnit codeUnit = new CodeCompileUnit(); codeUnit.Namespaces.Add(codeNamespace); ServiceDescriptionImportWarnings importWarnings = descriptionImporter.Import(codeNamespace, codeUnit); if (importWarnings == 0) // no warnings { // create a c# compiler CodeDomProvider compiler = CodeDomProvider.CreateProvider("CSharp"); // include the assembly references needed to compile string[] references = new string[2] { "System.Web.Services.dll", "System.Xml.dll" }; CompilerParameters parameters = new CompilerParameters(references); // compile into assembly CompilerResults results = compiler.CompileAssemblyFromDom(parameters, codeUnit); foreach (CompilerError oops in results.Errors) { // trap these errors and make them available to exception object throw new Exception("Compilation Error Creating Assembly"); } // all done.... return results.CompiledAssembly; } else { // warnings issued from importers, something wrong with WSDL throw new Exception("Invalid WSDL"); } } /// <summary> /// Builds an assembly from a web service description. /// The assembly can be used to execute the web service methods. /// </summary> /// <param name="webServiceUri">Location of WSDL.</param> /// <returns>A web service assembly.</returns> private Assembly BuildAssemblyFromWSDL(Uri webServiceUri) { if (String.IsNullOrEmpty(webServiceUri.ToString())) throw new Exception("Web Service Not Found"); XmlTextReader xmlreader = new XmlTextReader(webServiceUri.ToString() + "?wsdl"); ServiceDescriptionImporter descriptionImporter = BuildServiceDescriptionImporter(xmlreader); return CompileAssembly(descriptionImporter); } private Assembly webServiceAssembly; private List<string> services; }}