MetadataImporter 类

定义

public ref class MetadataImporter abstract

public abstract class MetadataImporter

type MetadataImporter = class

Public MustInherit Class MetadataImporter

继承

Object

MetadataImporter

派生

System.ServiceModel.Description.WsdlImporter

示例

下面的示例演示如何通过使用自定义语句、检查 System.ServiceModel.Description.WsdlImporter 属性、将导入元数据编译为托管类型，并将结果保存到代码文件来使用 Errors 派生类导入元数据。

  static void GenerateCSCodeForService(EndpointAddress metadataAddress, string outputFile)
  {
MetadataExchangeClient mexClient = new MetadataExchangeClient(metadataAddress);
mexClient.ResolveMetadataReferences = true;
MetadataSet metaDocs = mexClient.GetMetadata();

      WsdlImporter importer = new WsdlImporter(metaDocs);
ServiceContractGenerator generator = new ServiceContractGenerator();

// Add our custom DCAnnotationSurrogate
// to write XSD annotations into the comments.
object dataContractImporter;
XsdDataContractImporter xsdDCImporter;
if (!importer.State.TryGetValue(typeof(XsdDataContractImporter), out dataContractImporter))
{
  Console.WriteLine("Couldn't find the XsdDataContractImporter! Adding custom importer.");
  xsdDCImporter = new XsdDataContractImporter();
  xsdDCImporter.Options = new ImportOptions();
  importer.State.Add(typeof(XsdDataContractImporter), xsdDCImporter);
}
else
{
  xsdDCImporter = (XsdDataContractImporter)dataContractImporter;
  if (xsdDCImporter.Options == null)
  {
    Console.WriteLine("There were no ImportOptions on the importer.");
    xsdDCImporter.Options = new ImportOptions();
  }
}
xsdDCImporter.Options.DataContractSurrogate = new DCAnnotationSurrogate();

// Uncomment the following code if you are going to do your work programmatically rather than add
// the WsdlDocumentationImporters through a configuration file.
/*
// The following code inserts a custom WsdlImporter without removing the other
// importers already in the collection.
System.Collections.Generic.IEnumerable<IWsdlImportExtension> exts = importer.WsdlImportExtensions;
System.Collections.Generic.List<IWsdlImportExtension> newExts
  = new System.Collections.Generic.List<IWsdlImportExtension>();
foreach (IWsdlImportExtension ext in exts)
{
  Console.WriteLine("Default WSDL import extensions: {0}", ext.GetType().Name);
  newExts.Add(ext);
}
newExts.Add(new WsdlDocumentationImporter());
System.Collections.Generic.IEnumerable<IPolicyImportExtension> polExts = importer.PolicyImportExtensions;
importer = new WsdlImporter(metaDocs, polExts, newExts);
*/

System.Collections.ObjectModel.Collection<ContractDescription> contracts
  = importer.ImportAllContracts();
importer.ImportAllEndpoints();
      foreach (ContractDescription contract in contracts)
      {
          generator.GenerateServiceContractType(contract);
      }
if (generator.Errors.Count != 0)
  throw new Exception("There were errors during code compilation.");

// Write the code dom
System.CodeDom.Compiler.CodeGeneratorOptions options
  = new System.CodeDom.Compiler.CodeGeneratorOptions();
      options.BracingStyle = "C";
      System.CodeDom.Compiler.CodeDomProvider codeDomProvider
  = System.CodeDom.Compiler.CodeDomProvider.CreateProvider("C#");
      System.CodeDom.Compiler.IndentedTextWriter textWriter
  = new System.CodeDom.Compiler.IndentedTextWriter(new System.IO.StreamWriter(outputFile));
      codeDomProvider.GenerateCodeFromCompileUnit(
  generator.TargetCompileUnit, textWriter, options
);
      textWriter.Close();
  }

注解

使用 MetadataImporter 抽象类的实现导入服务元数据。 从 MetadataImporter 类派生的类型实现对导入元数据格式的支持，这些格式利用 Windows Communication Foundation (WCF) 中的WS-Policy导入逻辑。

MetadataImporter 实现收集附加到 System.ServiceModel.Description.PolicyConversionContext 对象中服务元数据的策略表达式。 然后，通过在 MetadataImporter 属性中调用 System.ServiceModel.Description.IPolicyImportExtension 接口的实现，MetadataImporter.PolicyImportExtensions 在导入元数据的过程中处理策略。

您可以将导入新策略断言的支持添加到 MetadataImporter，方法是将您自己的 System.ServiceModel.Description.IPolicyImportExtension 接口的实现添加到 MetadataImporter.PolicyImportExtensions 实例的 MetadataImporter 属性。 或者，可以在应用程序配置文件中注册策略导入扩展。

System.ServiceModel.Description.WsdlImporter 类型是 WCF 所包含的 MetadataImporter 抽象类的实现。 System.ServiceModel.Description.WsdlImporter 类型可以导入含有附加策略（这些策略捆绑在 System.ServiceModel.Description.MetadataSet 对象中）的 WSDL 元数据。

通过实现 System.ServiceModel.Description.IWsdlImportExtension 接口，然后将实现添加到 WsdlImporter.WsdlImportExtensions 实例上的 System.ServiceModel.Description.WsdlImporter 属性，可以添加对导入 WSDL 扩展的支持。 System.ServiceModel.Description.WsdlImporter 还可以加载应用程序配置文件中注册的 System.ServiceModel.Description.IWsdlImportExtension 接口的实现。

属性

方法

适用于