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;
}
}
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;
}
}
在另外一个能正常执行的程序里，也是用http://121.52.210.226/Services/EcgWebService.asmx初始化的，没有问题啊。
是有个参数错了，webservice里用的是float的参数，我调用的时候用了double