处理代理中的错误 - WCF

Question

可以找到有关如何在客户端中处理错误的好建议 here。
复制到这里方便访问：

MyServiceClient myServiceClient = new MyServiceClient();

try
{
    documents = myServiceClient.GetDocuments();
    // More code that isn't useful including here ...
    myServiceClient.Close();
}
catch (TimeoutException exception)
{
    MessageBox.Show(exception.Message, "Timeout error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    myServiceClient.Abort();
}
catch (FaultException<ServiceErrorDetails> error)
{
    MessageBox.Show(error.Detail.Message, "Service error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    myServiceClient.Abort();
}
catch (CommunicationException exception)
{
    MessageBox.Show(exception.Message, "Communication error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    myServiceClient.Abort();
}

现在我在这个解决方案中遇到的问题是我的代理包含很多很多方法。易于理解我不想在我的所有方法调用周围添加这个巨大的 try/catch 语句。
相反，我认为从 MyServiceClient() class.
中添加错误处理可能是个好主意但问题是如何做到这一点而不用这个 try/catch 语句再次污染这里的所有方法？
你会如何处理？

Answer 1

您可以尝试将 try/catch 逻辑封装在处理程序 class 中，如下所示：

public static class Example
{
    public static void ExecuteExample()
    {
        var serviceClient = new ServiceClient();

        var documents = ProxyErrorHandler.Execute(serviceClient, serviceClient.GetDocuments);
    }
}

public static class ProxyErrorHandler
{
    public static void Execute(ServiceClient serviceClient, Action actionToExecute)
    {
        Execute(serviceClient, () =>
        {
            actionToExecute();

            return true;
        });
    }

    public static T Execute<T>(ServiceClient serviceClient, Func<T> functionToExecute)
    {
        try
        {
            return functionToExecute();
        }
        catch (Exception exception)
        {
            ShowException(serviceClient, exception);

            return default;
        }
    }

    public static Task ExecuteAsync(ServiceClient serviceClient, Func<Task> actionToExecute)
    {
        return ExecuteAsync(serviceClient, async () =>
        {
            await actionToExecute();

            return true;
        });
    }

    public static async Task<T> ExecuteAsync<T>(ServiceClient serviceClient, Func<Task<T>> functionToExecute)
    {
        try
        {
            return await functionToExecute();
        }
        catch (Exception exception)
        {
            ShowException(serviceClient, exception);

            return default;
        }
    }

    private static void ShowException(ServiceClient serviceClient, Exception exception)
    {
        string title;
        var message = exception.Message;

        switch (exception)
        {
            case TimeoutException:
                title = @"Timeout error";
                break;
            case FaultException<ServiceErrorDetails> faultException:
                title = @"Service error";
                message = faultException.Detail.Message;
                break;
            case CommunicationException:
                title = @"Communication error";
                break;
            default:
                ExceptionDispatchInfo.Throw(exception);
                
                // Unreachable
                throw new Exception();
        }

        MessageBox.Show(message, title, MessageBoxButtons.OK, MessageBoxIcon.Error);

        serviceClient.Abort();
    }
}

处理代理中的错误 - WCF

Handling errors within a proxy - WCF

c#

error-handling

service

wcf

proxy