Dynamically referencing WebService, establishing WebService virtual machines

Web| dynamically establishes WebService virtual proxies and uses XML to register WebService reference addresses. Implement dynamic reference WebService.

Use of technology
1, dynamic compilation

2, Reflective technology

Implementation code
Using System;

Using System.Reflection;

Using system.web. Services. Description;

Using Microsoft.csharp;

Using System.CodeDom;

Using System.CodeDom.Compiler;

Using System.IO;

Using System.Text;

Using System.Xml;

Using System.Net;

Using WebServiceProxy;

Namespace WebServiceProxy

{



public class WebServiceProxy

{

Private Assembly _ass = null;



private string _protocolname = "Soap";

private string _srcwsproxy = String. Empty;



Public Assembly Assembly {get{return _ass;}}



public string ProtocolName



{get{return _protocolname} set {_protocolname = value;}}



public string Srcwsproxy {get{return _srcwsproxy}}







Public WebServiceProxy ()



{



}



Public WebServiceProxy (String wsdlsourcename)



{



ASSEMBLYFROMWSDL (GETWSDL (wsdlsourcename));



}



public string wsdlfromurl (string url)



{



WebRequest req = webrequest.create (URL);



WebResponse result = req. GetResponse ();



Stream Receivestream = result. GetResponseStream ();



Encoding encode = System.Text.Encoding.GetEncoding ("Utf-8");



StreamReader sr = new StreamReader (receivestream, encode);



String strwsdl = Sr. ReadToEnd ();



return strwsdl;



}



public string getwsdl (string source)

{



if (source. StartsWith ("<?xml version") = = True)



{

return source;

}

Else



if (source. StartsWith ("http://") = = True)

{

return Wsdlfromurl (source);

}



return wsdlfromfile (source);

}

public string Wsdlfromfile (string filefullpathname)

{

FileInfo fi = new FileInfo (filefullpathname);

if (FI. Extension = = "WSDL")

{

FileStream fs = new FileStream (Filefullpathname, FileMode.Open,

FileAccess.Read);

StreamReader sr = new StreamReader (FS);

char[] buffer = new char[(int) fs. Length];

Sr. Readblock (buffer, 0, (int) fs. Length);

return new string (buffer);

}



throw new Exception ("This is no a WSDL file");

}



Public Assembly assemblyfromwsdl (string strwsdl)

{

XML Text Reader

StringReader wsdlstringreader = new StringReader (STRWSDL);

XmlTextReader tr = new XmlTextReader (Wsdlstringreader);

ServiceDescription SD = servicedescription.read (TR);

Tr. Close ();



WSDL Service Description Importer

CodeNamespace CNS = new CodeNamespace ("Webserviceproxy.webserviceaccessor");

ServiceDescriptionImporter SDI = new ServiceDescriptionImporter ();

Sdi. Addservicedescription (SD, NULL, NULL);

Sdi. ProtocolName = _protocolname;

Sdi. Import (CNS, NULL);



Source code Generation

CSharpCodeProvider CSCP = new CSharpCodeProvider ();

ICodeGenerator ICG = CSCP. CreateGenerator ();

StringBuilder Srcstringbuilder = new StringBuilder ();

StringWriter SW = new StringWriter (Srcstringbuilder);

Icg. GenerateCodeFromNamespace (CNS, SW, NULL);

_srcwsproxy = Srcstringbuilder.tostring ();

Sw. Close ();



Assembly compilation.

CompilerParameters cp = new CompilerParameters ();

Cp. Referencedassemblies.add ("System.dll");

Cp. Referencedassemblies.add ("System.Xml.dll");

Cp. Referencedassemblies.add ("System.Web.Services.dll");

Cp. GenerateExecutable = false;

Cp. GenerateInMemory = true;

Cp. IncludeDebugInformation = false;

ICodeCompiler ICC = CSCP. CreateCompiler ();

CompilerResults CR = Icc.compileassemblyfromsource (CP, _srcwsproxy);

if (CR. Errors.Count > 0)

throw new Exception (string. Format ("Build failed: {0} errors",

Cr. Errors.Count));



return _ass = cr.compiledassembly;

}





public Object CreateInstance (string objtypename)

{

Type t = _ass. GetType ("Webserviceproxy.webserviceaccessor" + "." + Objtypename);

return Activator.CreateInstance (t);

}





public object Invoke (Object obj, String methodname, params object[] args)

{

MethodInfo mi = obj. GetType (). GetMethod (methodname);

Return MI. Invoke (obj, args);

}

}



}