C#开发WinForm清空DataGridView控件绑定的数据

使用DataGridView控件绑定数据后有时需要清空绑定的数据,在清除DataGridView绑定的数据时:

1、设置DataSource为null

this.dgvDemo.DataSource = null

这样虽然可以清空DataGridView绑定的数据,但是DataGridView的列也会被删掉。

2、用DataGridView.Row.Clear()

this.dgvDemo.Rows.Clear()

使用这种方法会报错,提示“不能清除此列表”,报错信息如下:

以上两种方法都不是想要的结果。要想保持原有的列不被删除,就要清除原先绑定的DataTable中的数据,然后重新绑定DataTable

DataTable dt = this.dgvDemo.DataSource as DataTable;
dt.Rows.Clear();
this.dgvDemo.DataSource = dt;

示例代码如下:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DataGridViewDemo
{
  public partial class Form1 : Form
  {
      public Form1()
      {
          InitializeComponent();
      }

      string strCon = ConfigurationManager.ConnectionStrings["DbConnection"].ConnectionString;

      private void btn_BindingData_Click(object sender, EventArgs e)
      {
          DataTable dt = GetDataSource();
          this.dgvDemo.DataSource = dt;
      }

      private DataTable GetDataSource()
      {
          DataTable dt = new DataTable();
          SqlConnection conn = new SqlConnection(strCon);
          string strSQL = "SELECT XIANGMUCDDM AS '项目代码',XIANGMUMC AS '项目名称', DANJIA AS '单价',SHULIANG AS '数量' FROM InPatientBillDt WHERE 就诊ID='225600'";
          SqlCommand cmd = new SqlCommand(strSQL, conn);
          SqlDataAdapter adapter = new SqlDataAdapter();
          adapter.SelectCommand = cmd;
          try
          {
              conn.Open();
              adapter.Fill(dt);
          }
          catch (Exception ex)
          {
              MessageBox.Show(ex.Message);
          }
          finally
          {
              conn.Close();
          }
          return dt;
      }

      private void btn_Clear_Click(object sender, EventArgs e)
      {
          // this.dgvDemo.DataSource = null会将DataGridView的列也删掉
          //this.dgvDemo.DataSource = null;

          // 会报错:提示“不能清除此列表”
          //this.dgvDemo.Rows.Clear();

          DataTable dt = this.dgvDemo.DataSource as DataTable;
          dt.Rows.Clear();
          this.dgvDemo.DataSource = dt;
      }
  }
}

示例程序下载地址:点此下载

关于清空DataGridView控件绑定数据的文章就介绍到这了。希望对大家的学习有所帮助,也希望大家多多支持编程教程

 一、前言闲来无事,从零开始整个《3D迷宫》小游戏。本篇文章会详细介绍构思、实现思路,希望可以帮助到有缘人。 二、构思首先,要实现一个小游戏,心里肯定要有一个大概的想法,然后就 ...