Question

无论我怎么努力，我似乎无法在Silverlight中处理WCF故障。事实上，错误似乎永远不会离开服务器！

E.g。当我调试它时，它会在我抛出FaultException的行上停止，说它没有被处理：

[SilverlightFaultBehavior]
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class StoreService : IStoreContract
{
    public System.Collections.Generic.List<string> GetStoreDesignNames()
    {
        try
        {
            StoreDataContext swdc = new StoreDataContext();
            var query = from storeDesign in swdc.StoreDesignDBs select storeDesign.Name;
            return query.ToList();
        }
        catch (System.Data.SqlClient.SqlException sqlExcept)
        {
            throw new FaultException<SqlFault>(new SqlFault() { Message = sqlExcept.Message });
        }
    }
}

实现此方法的类派生自契约接口：

[ServiceContract(Namespace = "Store")]
public interface IStoreContract
{
    /// <summary>
    /// Obtain the list of store design names.
    /// </summary>
    [OperationContract,
     FaultContract(typeof(SqlFault))]
    List<String> GetStoreDesignNames();
}

SqlFault类的定义如下：

public class SqlFault
{
    public String Message { get; set; }
}

在客户端，我处理错误如下：

        // swc is the client
        swc.GetStoreDesignNamesCompleted += new EventHandler<ServiceReference.GetStoreDesignNamesCompletedEventArgs>((obj, evt) =>
        {
            if (evt.Error == null)
            {
                // In case of success
                MessageBox.Show(evt.Result.First());
            }
            else if (evt.Error is FaultException<ServiceReference.SqlFault>)
            {
                FaultException<ServiceReference.SqlFault> fault = evt.Error as FaultException<ServiceReference.SqlFault>;
                Dispatcher.BeginInvoke(() =>
                {
                    ErrorWindow ew = new ErrorWindow(fault.Detail.Message, "No details");
                    ew.Show();
                });
            }
        });
        swc.GetStoreDesignNamesAsync();

我试图在界面上放置[SilverlightFaultBehavior]属性，但无济于事。即使我没有接口，我仍然有这个错误。

我还尝试在web.config中使用行为扩展名为described here，但我收到一条警告，说扩展名无效。

如何在Siverlight中正确处理WCF故障？提前谢谢。

Answer 1

我没有使用过WCF（一直使用WCF RIA服务），但我刚才发现过这篇文章。

Getting something better than “Server not found.” from WCF in Silverlight

Answer 2

经过几个小时的斗争，我终于一起攻击了一些有效的东西。这真是一个可怕的黑客，我更倾向于使用BehaviorExtension来完成这项任务。诀窍是在WCF方法的主体中手动设置HTTP状态代码，如下所示：

    public System.Collections.Generic.List<string> GetStoreDesignNames()
    {
        try
        {
            StoreDataContext swdc = new StoreDataContext();
            var query = from storeDesign in swdc.StoreDesignDBs select storeDesign.Name;
            return query.ToList();
        }
        catch (System.Data.SqlClient.SqlException sqlExcept)
        {
            System.ServiceModel.Web.WebOperationContext ctx = System.ServiceModel.Web.WebOperationContext.Current;
            ctx.OutgoingResponse.StatusCode = System.Net.HttpStatusCode.OK;
            throw new FaultException<SqlFault>(new SqlFault() { Message = sqlExcept.Message });
        }
    }

然后在客户端正确显示错误消息。如果有人有比这更好的解决方案，我想听听。

如何使用Silverlight正确处理WCF故障？

2 个答案: