如何删除选中复选框的数据网格视图中的行？

Question

我正在使用 C# .NET 2.0 Visual Studio 2005。

我遇到了奇怪的问题。

有一个简单的窗口窗体，只有一个 DataGridView，其中 column1 为复选框 (DataGridViewCheckboxColumn)。

然后如果单元格中的复选框被选中，我想删除选中的行。

听起来很简单，但它并没有以某种方式删除所有选中的行，而且我真的不明白为什么它会以这种方式运行。

例如，我有 5 行并选中了每行中的所有复选框，但它只删除了 3 行。有没有人见过这个？这是一个错误还是我做错了什么？

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        //when I click the button, all checked row should be removed
        private void button1_Click(object sender, EventArgs e)
        {
            foreach (DataGridViewRow row in dataGridView1.Rows)
            {
                if ((bool)row.Cells[0].Value)
                {
                    dataGridView1.Rows.Remove(row);
                }
            }
        }
    }
}

Answer 1

当删除一行时，行数也会减少，因此如果您将代码放入 for 循环并反向运行，它会正常工作，看看：

for (int i = dataGridView1.Rows.Count -1; i >= 0 ; i--)
{
    if ((bool)dataGridView1.Rows[i].Cells[0].FormattedValue)
    {
        dataGridView1.Rows.RemoveAt(i);
    }
}

Answer 2

您在迭代时修改了一个集合。

使用删除列表而不是删除行。

Answer 3

您在迭代集合时正在修改它。试试这样

List<DataGridViewRow> toDelete = new List<DataGridViewRow>();
foreach (DataGridViewRow row in dataGridView1.Rows) {
    if (row.Cells[0].Value == true) {
        toDelete.Add(row);
    }
}
foreach (DataGridViewRow row in toDelete) {
    dataGridView1.Rows.Remove(row);
}

Answer 4

这个解决方案有一点错误，我修正了添加 1 行:)

List<DataGridViewRow> toDelete = new List<DataGridViewRow>();

foreach (DataGridViewRow row in dataGridView1.Rows) 
{
  bool s = Convert.ToBoolean(row.Cells[0].Value) //added this line

  if (s == true) 
    {
        toDelete.Add(row);
    }
}

foreach (DataGridViewRow row in toDelete) 
{
    dataGridView1.Rows.Remove(row);
}

Answer 5

@Chen Kinnrot，绝对有钱！当你运行你的函数时，你总是只会删除 n % 2 行，所以如果你有 10 行，那么你将删除 5，而 101 将是 51，等等。遍历集合以查找哪些复选框被选中，然后删除那些行。更好的解决方案是将事件附加到单击 button1 时自动运行的复选框。

Answer 6

ASPXPAGE:
<strong>Asp.Net : Delete Multiple Records form datagridview in one time<br />
        </strong>

        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
            BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px"
            CellPadding="4" EnableModelValidation="True" ForeColor="Black">
            <Columns>
                <asp:TemplateField>
                    <EditItemTemplate>
                        <asp:CheckBox ID="CheckBox1" runat="server" />
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:CheckBox ID="CheckBox1" runat="server" />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="id" HeaderText="Sr No" />
                <asp:BoundField DataField="doc_name" HeaderText="Name" />
                <asp:BoundField DataField="doc_add" HeaderText="Address" />
                <asp:BoundField DataField="doc_mob" HeaderText="Mobile No" />
                <asp:BoundField DataField="doc_email" HeaderText="Email" />
            </Columns>
            <FooterStyle BackColor="#CCCC99" ForeColor="Black" />
            <HeaderStyle BackColor="#333333" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="White" ForeColor="Black" HorizontalAlign="Right" />
            <SelectedRowStyle BackColor="#CC3333" Font-Bold="True" ForeColor="White" />
        </asp:GridView>
        <br />
        <asp:Button ID="Button1" runat="server" Font-Size="12pt"
            onclick="Button1_Click1" Text="Delete" />
        <br />



Code Behind Page:
SqlConnection conn = new SqlConnection(@"server=server-pc; database=HMS; integrated security=true");
    protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack == false)
        {
            load_data();
        }
    }

   public void load_data()
    {
        SqlDataAdapter adp = new SqlDataAdapter("select * from doc_master", conn);
        DataSet ds = new DataSet();
        adp.Fill(ds);
        GridView1.DataSource = ds.Tables[0];
        GridView1.DataBind();
    }
   protected void Button1_Click1(object sender, EventArgs e)
   {
       CheckBox ch;
       for (int i = 0; i < GridView1.Rows.Count; i++)
       {
           ch = (CheckBox)GridView1.Rows[i].Cells[0].Controls[1];
           if (ch.Checked == true)
           {
      int id = Convert.ToInt32(GridView1.Rows[i].Cells[1].Text);
      SqlCommand cmd = new SqlCommand("delete from doc_master where ID=" + id + " ", conn);
      conn.Open();
      cmd.ExecuteNonQuery();
      conn.Close();
           }
       }

       load_data();
   }

详细代码请访问： http://www.gtuguide.com/2014/05/deleting-multiple-rows-in-gridview.html

Answer 7

  protected void btnDelRow_Click(object sender, EventArgs e)
    {
        #region Delete Row from data list Grid On Behalf of checkbox from dyanamically added grid
        int ClSno = 0;  /*Use For Sitewise New Serial No*/
        foreach (DataListItem dst in dstBillDetails.Items)
        {
            ClSno = ClSno + 1;        
            Label lbl_SChkFlag = (Label)dst.FindControl("lblSChkFlag");        
            GridView Grid_B = (GridView)dst.FindControl("GridB");
            if (lbl_SChkFlag.Text == "0")
            {
                int Newbillflg = 0;/**If SiteCode Is Zero Then Usefull**/
                foreach (GridViewRow gvr in Grid_B.Rows)
                {
                    #region
                    Label lbl_grdId = (Label)gvr.FindControl("lblgrdId");
                    CheckBox chk_dstgrdlst = (CheckBox)gvr.FindControl("chkdstgrdlst");
                  
                    if (chk_dstgrdlst.Checked == true)
                    {
                        if (Grid_B.Rows.Count > 1)
                        {
                        
                            gvr.Style["display"] = "none";
                            lbl_grdId.Text = "1";                          
                        }
                        else
                        {/**When Gridview Row is Zero**/
                            Grid_B.Visible = false;
                            lbl_grdId.Text = "1";
                            /**When Gridview Row is Zero**/
                        }
                      
                    }
                    #endregion
                }
            }
        }
        #endregion
    }