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我用 FaultExceptions 定义了一个 WCF 服务,但客户端没有正确捕获异常。

例外情况的合同是:

[DataContract]
public class ServiceFault {
    [DataMember]
    public string Operation { get; set; }

    [DataMember]
    public string Reason { get; set; }

    [DataMember]
    public string Message { get; set; }
}

操作

public interface IProductsService {
    [OperationContract]
    [FaultContract(typeof(ServiceFault))]
    List<string> ListProducts();
}

在操作中我故意引入了一个错误:

    public List<string> ListProducts() {
        List<string> productsList = null;// = new List<string>();

        try {
            using (var database = new AdventureWorksEntities()) {
                var products = from product in database.Products
                               select product.ProductNumber;
                productsList.Clear(); // Introduced this error on purpose
                productsList = products.ToList();
            }
        }
        catch (Exception e) {
            throw new FaultException<ServiceFault>(new ServiceFault() {
                Operation = MethodBase.GetCurrentMethod().Name,
                Reason = "Error ocurred",
                Message = e.InnerException.Message
            });
        }

        return productsList;
    }

然后在客户端应用程序中,我抓住了

catch (FaultException<ServiceFault> ex) {
    Console.WriteLine("FaultException<ArgumentFault>: {0} - {1} - {2}",
            ex.Detail.Operation, ex.Detail.Reason, ex.Detail.Message);

}
catch (FaultException e) {
    Console.WriteLine("{0}: {1}", e.Code.Name, e.Reason);
}

但是第二个捕获是捕获错误,所以我收到了这条消息(虽然正确的形式不正确)

InternalServiceFault: Object reference not set to an instance of an object

我该怎么做才能使强类型异常捕获错误?

PS:有一个类似的帖子,但我不明白

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1 回答 1

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你确定e.InnerException不是 null in Message = e.InnerException.Message吗?

这将导致NullReferenceException服务调用中未处理,因此抛出FaultException<ExceptionDetail>而不是FaultException<ServiceFault>.

于 2014-03-31T00:03:33.257 回答