.NET的动态编译与WS服务调用详解

CodeDomProvider provider = CodeDomProvider.CreateProvider("CSharp");
CompilerParameters codeParameters = new CompilerParameters();
codeParameters.GenerateExecutable = false; //编译为dll，如果为true则编译为exe
codeParameters.GenerateInMemory = true; //编译后的程序集保存到内存中
StringBuilder code = new StringBuilder();
//此处构造源代码
CompilerResults results = provider.CompileAssemblyFromSource(codeParameters, code.ToString());
Assembly assembly = null; //动态编译生成的程序集
if (!results.Errors.HasErrors)
{
    assembly = results.CompiledAssembly;
}

[ServiceContract(Namespace="https://www.jb51.net/")]
public interface TestService
{
    [OperationContract(Action = "https://www.jb51.net/HelloWorld", ReplyAction = "https://www.jb51.net/HelloWorldResponse")]
    string HelloWorld();
}
public class TestServiceClient : ClientBase<TestService>, TestService
{
    public TestServiceClient(Binding binding, EndpointAddress address) :
        base(binding, address)
    {
    }
    public string HelloWorld()
    {
        return base.Channel.HelloWorld();
    }
}

public class WebServiceParamaters
{
    public string address;
    public string Address
    {
        get { return address; }
        set
        {
            address = value;
        }
    }
    private string serviceNamespace;
    public string ServiceNamespace
    {
        get { return serviceNamespace; }
        set
        {
            serviceNamespace = value;
        }
    }
   private string methodAction;
    public string MethodAction
    {
        get { return methodAction; }
        set
        {
            methodAction = value;
        }
    }
    private string methodReplyAction;
    public string MethodReplyAction
    {
        get { return methodReplyAction; }
        set
        {
            methodReplyAction = value;
        }
    }
    private string methodName;
    public string MethodName
    {
        get { return methodName; }
        set
        {
            methodName = value;
        }
    }
    private string returnType;
    public string ReturnType
    {
        get { return returnType; }
        set
        {
            returnType = value;
        }
    }
}

public class WebServiceProxyCreator
{
    public Object WebServiceCaller(WebServiceParamaters parameters)
    {
        CodeDomProvider provider = CodeDomProvider.CreateProvider("CSharp");
        CompilerParameters codeParameters = new CompilerParameters();
        codeParameters.GenerateExecutable = false;
        codeParameters.GenerateInMemory = true;
        StringBuilder code = new StringBuilder();
        CreateProxyCode(code, parameters);
codeParameters.ReferencedAssemblies.Add("System.dll");
codeParameters.ReferencedAssemblies.Add("System.ServiceModel.dll");
        CompilerResults results = provider.CompileAssemblyFromSource(codeParameters, code.ToString());
        Assembly assembly = null;
        if (!results.Errors.HasErrors)
        {
            assembly = results.CompiledAssembly;
        }
        Type clientType = assembly.GetType("RuntimeServiceClient");
       ConstructorInfo ci = clientType.GetConstructor(new Type[] { typeof(Binding), typeof(EndpointAddress) });
        BasicHttpBinding binding = new BasicHttpBinding(); //只演示传统的WebService调用
        EndpointAddress address = new EndpointAddress(parameters.address);
        Object client = ci.Invoke(new object[] { binding, address });
        MethodInfo mi = clientType.GetMethod(parameters.MethodName);
        Object result = mi.Invoke(client, null);
        mi = clientType.GetMethod("Close"); //关闭代理
        mi.Invoke(client, null);
        return result;
   }
    public static void CreateProxyCode(StringBuilder code, WebServiceParamaters parameters)
    {
        code.AppendLine("using System;");
        code.AppendLine("using System.ServiceModel;");
        code.AppendLine("using System.ServiceModel.Channels;");
        code.Append(@"[ServiceContract(");
        if (!String.IsNullOrEmpty(parameters.ServiceNamespace))
        {
            code.Append("Namespace=\"").Append(parameters.ServiceNamespace).Append("\"");
        }
        code.AppendLine(")]");
        code.AppendLine("public interface IRuntimeService");
        code.AppendLine("{");
        code.Append("[OperationContract(");
        if (!String.IsNullOrEmpty(parameters.MethodAction))
        {
            code.Append("Action=\"").Append(parameters.MethodAction).Append("\"");
            if (!String.IsNullOrEmpty(parameters.MethodReplyAction))
            {
                code.Append(", ");
            }
        }
        if (!String.IsNullOrEmpty(parameters.MethodReplyAction))
        {
            code.Append("ReplyAction=\"").Append(parameters.MethodReplyAction).Append("\"");
        }
        code.AppendLine(")]");
        code.Append(parameters.ReturnType).Append(" ");
        code.Append(parameters.MethodName).AppendLine("();");
        code.AppendLine("}");
        code.AppendLine();
        code.AppendLine("public class RuntimeServiceClient : ClientBase<IRuntimeService>, IRuntimeService");
        code.AppendLine("{");
        code.AppendLine("public RuntimeServiceClient(Binding binding, EndpointAddress address) :base(binding, address)");
        code.AppendLine("{");
        code.AppendLine("}");
        code.Append("public ").Append(parameters.ReturnType).Append(" ");
        code.Append(parameters.MethodName).AppendLine("()");
        code.AppendLine("{");
        code.Append("return base.Channel.").Append(parameters.MethodName).AppendLine("();");
        code.AppendLine("}");
        code.AppendLine("}");
    }
}

 public override int GetHashCode()
  {
      return String.Concat(serviceNamespace, methodAction, methodReplyAction, methodName, returnType).GetHashCode();
  }

  public class WebServiceProxyCreator
   {
       private static Dictionary<int, Type> proxyTypeCatch = new Dictionary<int, Type>();

       public Object WebServiceCaller(WebServiceParamaters parameters)
       {
           int key = parameters.GetHashCode();
           Type clientType = null;
           if (proxyTypeCatch.ContainsKey(key))
          {
              clientType = proxyTypeCatch[key];
              Debug.WriteLine("使用缓存");
          }
          else
          {

              CodeDomProvider provider = CodeDomProvider.CreateProvider("CSharp");
              CompilerParameters codeParameters = new CompilerParameters();
              codeParameters.GenerateExecutable = false;
              codeParameters.GenerateInMemory = true;

              StringBuilder code = new StringBuilder();
              CreateProxyCode(code, parameters);

              codeParameters.ReferencedAssemblies.Add("System.dll");
              codeParameters.ReferencedAssemblies.Add("System.ServiceModel.dll");

              CompilerResults results = provider.CompileAssemblyFromSource(codeParameters, code.ToString());
              Assembly assembly = null;
              if (!results.Errors.HasErrors)
              {
                  assembly = results.CompiledAssembly;
              }

              clientType = assembly.GetType("RuntimeServiceClient");

              proxyTypeCatch.Add(key, clientType);
          }
          ConstructorInfo ci = clientType.GetConstructor(new Type[] { typeof(Binding), typeof(EndpointAddress) });
          BasicHttpBinding binding = new BasicHttpBinding(); //只演示传统的WebService调用
          EndpointAddress address = new EndpointAddress(parameters.address);
          Object client = ci.Invoke(new object[] { binding, address });

          MethodInfo mi = clientType.GetMethod(parameters.MethodName);
          Object result = mi.Invoke(client, null);
          mi = clientType.GetMethod("Close"); //关闭代理
          mi.Invoke(client, null);
          return result;
      }

 }