【发布时间】：2012-01-19 05:30:20
【问题描述】：
我正在通过我的网络服务动态调用网络服务。我将 serviceName、MethodToCall 和参数数组存储在我的数据库表中，并执行这两个方法来调用具有 .asmx 扩展名的动态服务 url 及其方法，而无需在我的应用程序中添加其引用。它工作正常。
下面的代码在这里。
public string ShowThirdParty(String strURL, String[] Params, String MethodToCall, String ServiceName)
{
String Result = String.Empty;
//Specify service Url without ?wsdl suffix.
//Reference urls for code help
///http://www.codeproject.com/KB/webservices/webservice_.aspx?msg=3197985#xx3197985xx
//http://www.codeproject.com/KB/cpp/CallWebServicesDynamic.aspx
//String WSUrl = "http://localhost/ThirdParty/WebService.asmx";
String WSUrl = strURL;
//Specify service name
String WSName = ServiceName;
//Specify method name to be called
String WSMethodName = MethodToCall;
//Parameters passed to the method
String[] WSMethodArguments = Params;
//WSMethodArguments[0] = "20500";
//Create and Call Service Wrapper
Object WSResults = CallWebService(WSUrl, WSName, WSMethodName, WSMethodArguments);
if (WSResults != null)
{
//Decode Results
if (WSResults is DataSet)
{
Result += ("Result: \r\n" + ((DataSet)WSResults).GetXml());
}
else if (WSResults is Boolean)
{
bool BooleanResult = (Boolean)WSResults;
if(BooleanResult)
Result += "Result: \r\n" + "Success";
else
Result += "Result: \r\n" + "Failure";
}
else if (WSResults.GetType().IsArray)
{
Object[] oa = (Object[])WSResults;
//Retrieve a property value withour reflection...
PropertyDescriptor descriptor1 = TypeDescriptor.GetProperties(oa[0]).Find("locationID", true);
foreach (Object oae in oa)
{
Result += ("Result: " + descriptor1.GetValue(oae).ToString() + "\r\n");
}
}
else
{
Result += ("Result: \r\n" + WSResults.ToString());
}
}
return Result;
}
public Object CallWebService(string webServiceAsmxUrl,
string serviceName, string methodName, string[] args)
{
try
{
System.Net.WebClient client = new System.Net.WebClient();
Uri objURI = new Uri(webServiceAsmxUrl);
//bool isProxy = client.Proxy.IsBypassed(objURI);
//objURI = client.Proxy.GetProxy(objURI);
//-Connect To the web service
// System.IO.Stream stream = client.OpenRead(webServiceAsmxUrl + "?wsdl");
string ccc = webServiceAsmxUrl + "?wsdl";// Connect To the web service System.IO.
//string wsdlContents = client.DownloadString(ccc);
string wsdlContents = client.DownloadString(ccc);
XmlDocument wsdlDoc = new XmlDocument();
wsdlDoc.InnerXml = wsdlContents;
System.Web.Services.Description.ServiceDescription description = System.Web.Services.Description.ServiceDescription.Read(new XmlNodeReader(wsdlDoc));
//Read the WSDL file describing a service.
// System.Web.Services.Description.ServiceDescription description = System.Web.Services.Description.ServiceDescription.Read(stream);
//Load the DOM
//--Initialize a service description importer.
ServiceDescriptionImporter importer = new ServiceDescriptionImporter();
importer.ProtocolName = "Soap12"; //Use SOAP 1.2.
importer.AddServiceDescription(description, null, null);
//--Generate a proxy client.
importer.Style = ServiceDescriptionImportStyle.Client;
//--Generate properties to represent primitive values.
importer.CodeGenerationOptions = System.Xml.Serialization.CodeGenerationOptions.GenerateProperties;
//Initialize a Code-DOM tree into which we will import the service.
CodeNamespace codenamespace = new CodeNamespace();
CodeCompileUnit codeunit = new CodeCompileUnit();
codeunit.Namespaces.Add(codenamespace);
//Import the service into the Code-DOM tree.
//This creates proxy code that uses the service.
ServiceDescriptionImportWarnings warning = importer.Import(codenamespace, codeunit);
if (warning == 0)
{
//--Generate the proxy code
CodeDomProvider provider = CodeDomProvider.CreateProvider("CSharp");
//--Compile the assembly proxy with the
// appropriate references
string[] assemblyReferences = new string[] {
"System.dll",
"System.Web.Services.dll",
"System.Web.dll",
"System.Xml.dll",
"System.Data.dll"};
//--Add parameters
CompilerParameters parms = new CompilerParameters(assemblyReferences);
parms.GenerateInMemory = true; //(Thanks for this line nikolas)
CompilerResults results = provider.CompileAssemblyFromDom(parms, codeunit);
//--Check For Errors
if (results.Errors.Count > 0)
{
foreach (CompilerError oops in results.Errors)
{
System.Diagnostics.Debug.WriteLine("========Compiler error============");
System.Diagnostics.Debug.WriteLine(oops.ErrorText);
}
throw new Exception("Compile Error Occured calling WebService.");
}
//--Finally, Invoke the web service method
Object wsvcClass = results.CompiledAssembly.CreateInstance(serviceName);
MethodInfo mi = wsvcClass.GetType().GetMethod(methodName);
return mi.Invoke(wsvcClass, args);
}
else
{
return null;
}
}
catch (Exception ex)
{
throw ex;
}
}
现在，当我有两个不同的客户端服务器时，问题就出现了。并从一台服务器调用服务到部署在另一台服务器上的服务。出现以下两种错误日志。找不到解决这个问题的确切原因。
System.Net.WebException: The request failed with HTTP status 400: Bad Request.
at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
at MarkUsageHistoryInSTJH.InsertUpdateIssueItemAditionalDetail(String csvBarcode, String csvName, String csvPMGSRN, String csvGLN, String csvMobile, String csvPhone, String csvAddressLine1, String csvAddressLine2, String csvAddressLine3, String csvIsHospital)
和
System.Net.Sockets.SocketException (0x80004005):
A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 172.17.13.7:80
at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception)
【问题讨论】：
-
当我们从另一个访问一个 webservice.asmx 时，我们遇到了类似的问题。我可以告诉你，这是因为调用 webservice 必须等待其他 websrvice 发送响应并且它超时。
标签： sql-server-2008 c#-4.0 webservice-client