如果数据表为null，则为tick条件 [英] Tick condition if datatable null C#

问题描述

大家好，我正在使用tick函数显示从数据库到数据表的更新数据。现在，问题是我当前的数据库是null，数据将由用户稍后插入。当我运行该程序时，它显示错误对象引用未设置为实例，现在如何确保tick函数运行而不抛出错误？



我尝试了什么：

Hi guys, i'm using tick function to show updated data from database to datatable. Now, the problem is my current database is null, data will be insert by user later. When i'm run the program it's showing error "object reference not set to an instance", now how can i make sure the tick function is running without throwing the error?

What I have tried:

private void timer_Tick (object sender, EventArgs e)
{
   this.tbl_StoredDataTableAdapter.Fill(this.gpdbDataSet.tbl_StoredData);
}

请帮帮我。谢谢！

Please help me. Thank you!

推荐答案

简单：检查空值。

Simple: check for nulls.

private void timer_Tick (object sender, EventArgs e)
   {
   if (tbl_StoredDataTableAdapter != null && gpdbDataSet != null && gpdbDataSet.tbl_StoredData != null)
      {
      this.tbl_StoredDataTableAdapter.Fill(this.gpdbDataSet.tbl_StoredData);
      }
   }

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