C#将SQL Server消息输出到文本文件

Question

我是C#的新手,所以请耐心等待,因为我继承了一个我试图调整的脚本.

我想让SQL PRINT/RAISERROR语句的输出显示在已在脚本的另一部分中声明的日志文件中.

这是我打电话的方法:

public void ProcessData(string StoredProcedure, int StartDate, int EndDate, string Directory, string LogFileNameAndPath)
    {
        SqlConnection sqlConnection = null;
        SqlCommand sqlCommand = null;
        SqlParameter sqlParameter = null;
       // String outputText = null;

        try
        {
            sqlConnection = new SqlConnection(_ConnectionString);
            sqlConnection.Open();

            sqlCommand = new SqlCommand();
            sqlCommand.CommandType = CommandType.StoredProcedure;
            sqlCommand.CommandText = StoredProcedure;
            sqlCommand.Connection = sqlConnection;
            sqlCommand.CommandTimeout = 0;

            sqlParameter = new SqlParameter("@StartDt", SqlDbType.Int);
            sqlParameter.Value = StartDate;
            sqlCommand.Parameters.Add(sqlParameter);

            sqlParameter = new SqlParameter("@EndDt", SqlDbType.Int);
            sqlParameter.Value = EndDate;
            sqlCommand.Parameters.Add(sqlParameter);

            sqlParameter = new SqlParameter("@stringDirs", SqlDbType.VarChar);
            sqlParameter.Value = Directory;
            sqlCommand.Parameters.Add(sqlParameter);

            sqlConnection.InfoMessage += new SqlInfoMessageEventHandler(OnInfoMessage);
            sqlCommand.ExecuteNonQuery();

        }
        catch (SqlException sqlEx)
        {
            throw sqlEx;
        }
        catch (Exception ex)
        {
            throw new Exception(ex.ToString());
        }
        finally
        {
            if (sqlConnection != null)
            {
                if (sqlConnection.State != ConnectionState.Closed)
                {
                    sqlConnection.Close();
                }
            }
        }
    }

这是信息处理程序方法:

    public void OnInfoMessage(object sender, SqlInfoMessageEventArgs args)//, String LogFileNameAndPath)
    {
        foreach (SqlError err in args.Errors)
        {

            //File.AppendAllText(LogFileNameAndPath, err.Message);
            Console.WriteLine("{0}", err.Message);
            //return err.Message;
          //"The {0} has received a severity {1}, state {2} error number {3}\n" +
         // "on line {4} of procedure {5} on server {6}:\n{7}",
         //  err.Source, err.Class, err.State, err.Number, err.LineNumber,
         //  err.Procedure, err.Server, err.Message);
        }
    }

我想通过"File.AppendAllText(LogFileNameAndPath,err.Message)"将其写入LogFileNameAndPath变量,而不是输出到控制台.但是,我通过网络查看了很多帖子,NOBODY提供了解决方案.有没有办法做到这一点？请善待.谢谢!

================================================== =========================

[ADDED 2015-07-27 1606 EDT]如果我更改此行:

sqlConnection.InfoMessage += new SqlInfoMessageEventHandler(OnInfoMessage);

... 至 ...

sqlConnection.InfoMessage += new SqlInfoMessageEventHandler(OnInfoMessage(LogFileNameAndPath));

......它无法编译. 这如何传递给方法？

这是新方法:

    public void OnInfoMessage(object sender, SqlInfoMessageEventArgs args, String LogFileNameAndPath)
    {
        foreach (SqlError err in args.Errors)
        {

            File.AppendAllText(@LogFileNameAndPath, err.Message);
            //Console.WriteLine("{0}", err.Message);
          }
    }

Answer 1

您不应尝试将日志文件名传递到事件处理程序中，而应在其他位置定义日志文件名，并在事件处理程序内可见。例如：

public class SqlHandler
{
    private readonly string m_LogFileNameAndPath = @"C:\log.txt";
    // or get it from AppConfig, as noted by FirebladeDan

    public void ProcessData() { /*...*/ }

    public void OnInfoMessage(object sender, SqlInfoMessageEventArgs args)
    {
        foreach(var err in args.Errors)
        {
            File.AppendAllText(m_LogFileNameAndPath, err.Message);
        }
    }
}

还值得注意的是，您仍然可以通过告诉库要记录到哪个文件来将日志记录库（Log4Net、NLog 等）与自定义文件一起使用。