c# - 应用程序断开与 Salesforce 的连接，有什么方法可以重试异常？

Question

我编写了一个通过 API 连接到 Salesforce.com 并查询和更新数据的应用程序。有时，如下所示的方法将无法连接并导致整个应用程序停止运行：

Exception in getMoreResults(): System.Net.WebException: The underlying connection was closed: The connection was closed unexpectedly.

qr = sfservice.queryMore(qr.Locator)在失败时重试执行的最佳方法是什么？理想情况下，我想在记录失败并停止程序执行之前尝试 3 次。下面是一些伪代码，虽然我不确定它的可行性。任何帮助深表感谢！

public QueryResult getMoreResults(QueryResult qr)
    {

        try
        {
            qr = sfservice.queryMore(qr.queryLocator);
        }
        catch (WebException ex)
        {
            bool success = false;
            //Todo retry this query until it is either successful or has failed three times
            for (int i = 0; i <= 3; i++)
            {
                //somehow set success boolean here

                if(success == false)
                {
                    qr = sfservice.queryMore(qr.queryLocator);
                    //log error and error attempt
                }
                else
                {
                    //exit this method and return to normal flow?
                }
            }
        }
        catch(Exception ex)
        {
            //log the error
            AppSettings.log.Error(ex.Message.ToString());
        }

        return qr;
    }

Answer 1

试试这个伪代码：

For i as Integer = 1 To 3
    Try
         qr = sfservice.queryMore(qr.queryLocator)
         Exit For
    Catch ex as Exception
    End Try
Next i