泛型C＃ - 从静态泛型类创建一个实例

问题描述：

我在我的应用程序中有一个工厂类，但由于我缺乏泛型知识，我不知道如何去创建这种特定类型的实例。泛型C＃ - 从静态泛型类创建一个实例

有人会友好地指点我如何调用这个类，以便它返回一个服务...任何帮助将不胜感激。

public class ServiceFactory<TService> where TService : WebServicesClientProtocol, new() 
{ 

    public static TService GetSecureService(string serviceUrl, X509Certificate certificate) 
    { 
     if (serviceUrl == null) 
     { 
      throw new ArgumentNullException(nameof(serviceUrl), "Service URL must be specified."); 
     } 

     if (serviceUrl == string.Empty) 
     { 
      throw new ArgumentException("Service URL cannot be empty.", nameof(serviceUrl)); 
     } 

     if (certificate == null) 
     { 
      throw new ArgumentNullException(nameof(certificate), "Client certificate must be specified."); 
     } 

     return Service(serviceUrl, certificate); 
    } 

    private static TService Service(string serviceUrl, X509Certificate certificate) 
    { 
     return ConfigureService((TService)Activator.CreateInstance(typeof(TService)), serviceUrl, certificate); 
    } 

    public static TService ConfigureService(TService service, string serviceUrl, X509Certificate certificate) 
    { 
     service.PreAuthenticate = true; 
     service.Credentials = CredentialCache.DefaultCredentials; 
     service.Timeout = 250; 
     service.Url = serviceUrl; 

     return ConfigureRequestSignature(service, certificate); 
    } 

    private static TService ConfigureRequestSignature(TService service, X509Certificate certificate) 
    { 
     X509SecurityToken signatureToken = new X509SecurityToken(certificate); 
     MessageSignature signature = new MessageSignature(signatureToken); 

     signature.SignatureOptions = SignatureOptions.IncludeTimestamp | SignatureOptions.IncludeSoapBody | SignatureOptions.IncludeMessageId | SignatureOptions.IncludeAction; 

     SoapContext requestContext = service.RequestSoapContext; 
     requestContext.Security.Tokens.Add(signatureToken); 
     requestContext.Security.Elements.Add(signature); 

     // TTL must be less than 60 seconds, otherwise the request will be discarded. 
     requestContext.Security.Timestamp.TtlInSeconds = 50; 

     return service; 
    } 
}

答

不知道，这可以实例化类的名称...

var service = ServiceFactory<ConcreteImplementationService>.GetSecureService(url, cert);

非常感谢，这是有意义的，它的:)已经有一段时间.. –

@MazH - 如果提供这个解决方案是正确的适合你，请[标记它作为接受] （http://stackoverflow.com/help/accepted-answer） –

答

由于您使用静态方法，使用方法级别的通用参数：

TService GetSecureService<TService>(string serviceUrl, X509Certificate certificate) 
    where TService : WebServicesClientProtocol, new() 
{ 
... 
    return Service<TService>(serviceUrl, certificate); 
}

你可能会发现所有的方法都会使用这个模式，并像上面调用Service（）时那样传递泛型类型。

MSDN文章泛型方法： https://msdn.microsoft.com/en-us/library/twcad0zb.aspx

泛型C＃ - 从静态泛型类创建一个实例

相关推荐