如何在脚本组件中显示正确的输出？

Question

我正在尝试将现有表转换为其他表。我将多行作为字符串，并使用逗号将其存储在一行下。

我创建了一个数据流任务，并添加了一个脚本组件，该组件将接收字符串并将其转换为blob数据。但是在SQL Server中输出列为nvarchar（max）时出现错误

 using System;
 using System.Data;
 using Microsoft.SqlServer.Dts.Pipeline.Wrapper;
 using Microsoft.SqlServer.Dts.Runtime.Wrapper;

[Microsoft.SqlServer.Dts.Pipeline.SSISScriptComponentEntryPointAttribute]
 public class ScriptMain : UserComponent
{
        private string ComputerName;
        private string TimeofLastScanAttempt;
        private string CopyofRPMCustom;
        Byte buffer;
        private bool FirstRow = true;


       public override void Input0_ProcessInputRow(Input0Buffer Row)
      {

             if ((Row.ComputerName == ComputerName && 
             Row.TimeofLastScanAttempt == TimeofLastScanAttempt) || 
            FirstRow)
     {
            CopyofRPMCustom += (Row.CopyofRPMCustom_IsNull? "," : 
            Row.CopyofRPMCustom);
            ComputerName = Row.ComputerName;
            TimeofLastScanAttempt = Row.TimeofLastScanAttempt;
            FirstRow = false;
      }
       else
      {
           Output0Buffer.AddRow();
           Output0Buffer.TimeofLastScanAttempt = TimeofLastScanAttempt;
           Output0Buffer.ComputerName = ComputerName;

           Output0Buffer.RPM.AddBlobData(
           System.Text.Encoding.Unicode.GetBytes(CopyofRPMCustom ?? ""));

            CopyofRPMCustom += (Row.CopyofRPMCustom_IsNull ? "," : 
           Row.CopyofRPMCustom);
            ComputerName = Row.ComputerName;
            TimeofLastScanAttempt = Row.TimeofLastScanAttempt;

          }
       }

      public override void FinishOutputs()
    {
         Output0Buffer.AddRow();
         Output0Buffer.TimeofLastScanAttempt = TimeofLastScanAttempt;
        Output0Buffer.ComputerName = ComputerName;

         Output0Buffer.RPM.AddBlobData(
         System.Text.Encoding.Unicode.GetBytes(CopyofRPMCustom ?? ""));
        base.FinishOutputs();

    }

当我调试此代码时，出现错误：

  

'Output0Buffer.RPM'引发了'Microsoft.SqlServer.Dts.Pipeline.NoCurrentRowException'类型的异常
  “ Output0Buffer.RPM_IsNull”引发了“ Microsoft.SqlServer.Dts.Pipeline.NoCurrentRowException”类型的异常

任务成功，但RPM列为空。其他所有内容都已填充。