wcf - WCF : How to handle errors when calling another WCF service?

Question

我有一个项目，我应该在其中编写调用另一个WCF服务的WCF服务。它看起来如下:

[ServiceContract]
public interface IAsurService
{
    [OperationContract(ReplyAction = AsurService.ReplyAction_GetCatalogList)]
    Message GetCatalogList();

public Message GetCatalogList()
{
    // The external client service
    GetNsiClient client = new GetNsiClient();

    authContext auth = new authContext
    {
        company = "asur_nsi",
        password = "lapshovva",
        user = "dogm_LapshovVA"
    };

    catalogs catalogs = client.getCatalogList(auth);

在这种情况下如何处理错误？我可以使用这样的标准故障契约(Contract)方法:

[DataContract]
public class AsurDataFaultException
{
    private string reason;

    [DataMember]
    public string Reason
    {
        get { return reason; }
        set { reason = value; }
    }
}

public Message GetCatalogList()
{
    // The external client service
    GetNsiClient client = new GetNsiClient();

    authContext auth = new authContext
    {
        company = "asur_nsi",
        password = "lapshovva",
        user = "dogm_LapshovVA"
    };

    catalogs catalogs = null;
    try
    {
        catalogs = client.getCatalogList(auth);
    }
    catch (Exception exception)
    {
        AsurDataFaultException fault = new AsurDataFaultException();
        fault.Reason = "The error: " + exception.Message.ToString();
        throw new FaultException<AsurDataFaultException>(fault);
    }

或者是其他东西？

先感谢您。

戈兰

Answer 1

如果远程WCF服务的失败导致代码失败，那么显然您应该抛出一个错误，但是该错误不应公开远程WCF服务的内部详细信息或其异常，例如:

catch (Exception exception) 
{
    // Indicate all that you may expose -- that the data is unavailable.
    DataUnavailableFault fault = new DataUnavailableFault();
    throw new FaultException<DataUnavailableFault>(fault); 
} 

当然，您也可以使用重试机制，但是很显然，如果最终导致的是远程服务失败，则应通过抛出适当的错误来向调用方表明这一点。