Question

我正在研究XML Web服务。我的客户端Web服务“客户端”在运行时具有服务器Web服务“服务”的wsdl的URL。为了让“客户”使用“服务”，我需要“以编程方式”执行以下操作：

1）从“服务”或磁盘上的某个位置动态获取wsdl文件。 2）以编程方式创建代理，即不使用wsdl.exe或添加Web引用。 3）在创建的代理上调用方法。

有可能吗？如果有人这样做，那么采取任何建议将会很有意义。

Answer 1

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Security.Permissions;
using System.Web.Services.Description;

namespace ConnectionLib
{
    public class WSProxy
    {
        [SecurityPermissionAttribute(SecurityAction.Demand, Unrestricted = true)]
        public static object CallWebService(string webServiceAsmxUrl, string serviceName, string methodName, object[] args)
        {
            System.Net.WebClient client = new System.Net.WebClient();

            // Connect To the web service
            System.IO.Stream stream = client.OpenRead(webServiceAsmxUrl + "?wsdl");

            // Now read the WSDL file describing a service.
            ServiceDescription 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 nmspace = new CodeNamespace();
            CodeCompileUnit unit1 = new CodeCompileUnit();
            unit1.Namespaces.Add(nmspace);

            // Import the service into the Code-DOM tree. This creates proxy code that uses the service.
            ServiceDescriptionImportWarnings warning = importer.Import(nmspace, unit1);

            if (warning == 0) // If zero then we are good to go
            {

                // Generate the proxy code
                CodeDomProvider provider1 = CodeDomProvider.CreateProvider("CSharp");

                // Compile the assembly proxy with the appropriate references
                string[] assemblyReferences = new string[5] { "System.dll", "System.Web.Services.dll", "System.Web.dll", "System.Xml.dll", "System.Data.dll" };

                CompilerParameters parms = new CompilerParameters(assemblyReferences);

                CompilerResults results = provider1.CompileAssemblyFromDom(parms, unit1);

                // 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 System.Exception("Compile Error Occured calling webservice. Check Debug ouput window.");
                }

                // 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;
            }
        }
    }
}

以编程方式使用wsdl创建代理并使用wsdl解析

1 个答案: