从 C# 运行 BCP 时检测错误

Question

我想运行从 C# 控制台应用程序进行 BCP，并能够检测 BCP 返回到 CMD 的语法、权限或其他错误。我尝试了 ErrorDataReceived 事件，但在我看来它在任何情况下都不会触发。你能帮我解决这个问题吗，谢谢

  processCMD("bcp", String.Format("\"select 'COUNTRY', 'MONTH' union all SELECT COUNTRY, cast(MONTH as varchar(2)) FROM DBName.dbo.TableName\" queryout {0}FILE_NAME.csv -c -t; -T -{1}", ExportDirectory, SQLServer));

    static void processCMD(string fileName, string arguments) 
            {

                System.Diagnostics.Process proc = new System.Diagnostics.Process();
                proc.StartInfo.FileName = fileName;
                proc.StartInfo.Arguments = arguments;
                proc.ErrorDataReceived += new DataReceivedEventHandler(NetErrorDataHandler);
                proc.Start();
                proc.WaitForExit();

            }

            private static void NetErrorDataHandler(object sendingProcess, DataReceivedEventArgs errLine)
            {
                Console.WriteLine(errLine);
                Console.ReadLine();
                // throw Exception ...
            }

/-- 最终解决方案：------------------------------------ -------------- /

static void processCMD(string fileName, string arguments)
        {
            StringBuilder cmdOutput = new StringBuilder();

            System.Diagnostics.Process proc = new System.Diagnostics.Process();
            proc.StartInfo.FileName = fileName;
            proc.StartInfo.Arguments = arguments;
            proc.StartInfo.UseShellExecute = false;
            proc.StartInfo.RedirectStandardOutput = true;
            proc.StartInfo.CreateNoWindow = true;
            proc.Start();

            while (!proc.StandardOutput.EndOfStream)
            {
                cmdOutput.Append(proc.StandardOutput.ReadLine());
            }
            proc.WaitForExit();

            if(!cmdOutput.ToString().Contains("successfully bulk-copied"))
                throw new BCPError(cmdOutput.ToString());
        }

        public class BCPError : Exception
        {
            public BCPError()
            {
            }

            public BCPError(string message)
                : base(message)
            {
            }

            public BCPError(string message, Exception inner)
                : base(message, inner)
            {
            }
        }

如果它被抛出，你可以显示错误，例如 e.ToString();

Answer 1

由于 BCP 是一个命令行程序，您应该期望 stdout 是控制台，除非您重定向它。你可以这样试试：

        static string processCMD(string fileName, string arguments) 
        {
            StringBuilder output = new StringBuilder();

            System.Diagnostics.Process proc = new System.Diagnostics.Process();
            proc.StartInfo.FileName = fileName;
            proc.StartInfo.Arguments = arguments;
            proc.UseShellExecute = false;
            proc.RedirectStandardOutput = true;
            proc.CreateNoWindow = true;
            proc.Start();
            while (!proc.StandardOutput.EndOfStream) {
                output.Append(proc.StandardOutput.ReadLine());
            }
            proc.WaitForExit();
            return output.ToString();
        }

从 C# 运行 BCP 时检测错误

Error detecting when runing BCP from C#

c#

error-handling

bcp