C#带参数的存储过程 [英] C# stored procedure with parameters

问题描述

我在我的应用程序中收到一个错误，我不知道如何解决它.代码如下:

I am receiving an error in my application and i can not figure out how to resolve it. Here is the code:

SqlConnection myConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["DBConnection"].ConnectionString);
myConnection.Open();

SqlCommand cmd = new SqlCommand("SELECT ServerIP FROM Servers", myConnection);

SqlDataReader rdr = cmd.ExecuteReader();

if (rdr.HasRows)
{
   while (rdr.Read())
   {
      string serverIP = rdr["ServerIP"].ToString();
      ScheduledTasks st = new ScheduledTasks(@"\" + serverIP);
      string[] taskNames = st.GetTaskNames();

      foreach (string name in taskNames)
      {
         Task t = st.OpenTask(name);
         var status = t.Status;
         var recentRun = t.MostRecentRunTime;
         var nextRun = t.NextRunTime;
         var appName = t.ApplicationName;

         SqlConnection myConnection2 = new SqlConnection(ConfigurationManager.ConnectionStrings["DBConnection"].ConnectionString);
         SqlCommand myCommand2 = new SqlCommand("sp_AddScheduledTasks", myConnection2);

         try
         {
            myConnection2.Open();
            myCommand2.CommandType = CommandType.StoredProcedure;
            myCommand2.Parameters.Add("@ID", SqlDbType.Int);
            myCommand2.Parameters["@ID"].Direction = ParameterDirection.Output;
            myCommand2.Parameters.Add("@ServerIP", SqlDbType.NVarChar, 20).Value = serverIP;
            myCommand2.Parameters.Add("@TaskName", SqlDbType.NVarChar, 50).Value = t;
            myCommand2.Parameters.Add("@MostRecentRun", SqlDbType.DateTime).Value = recentRun;
            myCommand2.Parameters.Add("@NextRunTime", SqlDbType.DateTime).Value = nextRun;
            myCommand2.Parameters.Add("@AppName", SqlDbType.NVarChar, 50).Value = appName;
            myCommand2.Parameters.Add("@Status", SqlDbType.NVarChar, 50).Value = status;

            int rows = myCommand2.ExecuteNonQuery();
         }
         finally
         {
            myConnection2.Close();
         }

我收到的错误是 ExecuteNonQuery.它说

The error I am receiving is with the ExecuteNonQuery. It says

InvalidCastException 失败将参数值从任务转换为一个字符串.

InvalidCastException Failed to convert parameter value from a Task to a String.

我认为这与我放置 try(在 if 语句中)的位置有关，但我不确定.任何帮助将不胜感激.

I thought it had something to do with where I put the try (inside the if statement) but I am not sure. Any help would be much appreciated.

谢谢，

马特

推荐答案

我的猜测是在

   myCommand2.Parameters.Add("@TaskName", SqlDbType.NVarChar, 50).Value = t;

t 不是字符串?

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