只允许在 DataGridView 中选中一个复选框

Question

我有一个 datagridview 填充数据库中的数据。第一列是一个复选框列（从数据库中检索到的该列的数据是 BIT 类型），我希望用户只检查一个。如果用户选择了另一个，第一个必须被取消选中。

我看过很多代码，但没有一个有效。

我能做什么？

是一个带有 SQL SERVER 的 Winforms C# 应用程序。

Answer 1

private void dataGridView_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
   // Whatever index is your checkbox column
   var columnIndex = 0;
   if (e.ColumnIndex == columnIndex)
   {
      // If the user checked this box, then uncheck all the other rows
      var isChecked = (bool)dataGridView.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
      if (isChecked)
      {
         foreach (DataGridViewRow row in dataGridView.Rows)
         {
            if (row.Index != e.RowIndex)
            {
               row.Cells[columnIndex].Value = !isChecked;
            }
         }
      }
   }
}

Answer 2

订阅CellContentClick 并添加dataGridView.EndEdit() 以获得更好的用户体验（单元不必失去焦点以触发事件）：

private void ChangeCheckedStateOfOtherCheckboxesInDgv(object sender, DataGridViewCellEventArgs e)
{
    const int chkBoxColumnIndex = 0;

    var dataGridView = (DataGridView)sender;

    if (e.ColumnIndex == chkBoxColumnIndex)
    {
        dataGridView.EndEdit();

        var isChecked = (bool)dataGridView[e.ColumnIndex, e.RowIndex].Value;

        if (isChecked)
        {
            foreach (DataGridViewRow row in dataGridView.Rows)
            {
                if (row.Index != e.RowIndex)
                    row.Cells[chkBoxColumnIndex].Value = !isChecked;
            }
        }
    }
}

Answer 3

VB网络版

Private Sub dataGridView_CellValueChanged(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DG_SubSyncs.CellValueChanged
    Dim columnIndex As Integer = 0
       If (e.ColumnIndex = columnIndex) Then
          'If the user checked this box, then uncheck all the other rows
          Dim isChecked As Boolean = CBool(DG_SubSyncs.Rows(e.RowIndex).Cells(e.ColumnIndex).Value)
           If (isChecked) Then
              For Each row In DG_SubSyncs.Rows
                  If (row.Index <> e.RowIndex) Then
                      row.Cells(columnIndex).Value = Not isChecked
                     End If
               Next
           End If
       End If
   End Sub

Answer 4

这是一个稍微清理过的版本。我的复选框列是动态添加的，并且始终是网格中的最后一列，但您明白了：

    private void ProfilesGrid_CellContentClick(object sender, [NotNull] DataGridViewCellEventArgs e)
    {
        DataGridView dataGridView = (DataGridView)sender;

        int columnCount = dataGridView.Columns.GetColumnCount(DataGridViewElementStates.None) - 1;

        if (e.ColumnIndex != columnCount)
        {
            return;
        }

        dataGridView.EndEdit();

        if (!(bool) dataGridView[e.ColumnIndex, e.RowIndex].Value)
        {
            return;
        }

        foreach (DataGridViewRow row in dataGridView.Rows.Cast<DataGridViewRow>().Where(row => row.Index != e.RowIndex))
        {
            row.Cells[columnCount].Value = false;
        }
    }

Answer 5

private void DataGridView_CellClick(object sender, DataGridViewCellEventArgs e)
{
    //Check to ensure that the row CheckBox is clicked.
    if (e.RowIndex >= 0 && e.ColumnIndex == 0)
    {
        //Loop and uncheck all other CheckBoxes.
        foreach (DataGridViewRow row in dataGridView1.Rows)
        {
            if (row.Index == e.RowIndex)
            {
                row.Cells["checkBoxColumn"].Value = !Convert.ToBoolean(row.Cells["checkBoxColumn"].EditedFormattedValue);
            }
            else
            {
                row.Cells["checkBoxColumn"].Value = false;
            }
        }
    }
}

Answer 6

这是我基于数据操作的答案。 您需要在表单中命名为 DataGridView1 的 datagridview，仅此而已。

    DataTable dt;

    private void Form1_Load(object sender, EventArgs e)
    {
        dt = CreateDataTablePeople("People");
        
        BindingSource bs = new BindingSource();
        bs.DataSource = dt;
        dataGridView1.DataSource = bs;

        dt.ColumnChanging += Dt_ColumnChanging  ;
    }

    private void Dt_ColumnChanging(object sender, DataColumnChangeEventArgs e)
    {
        if (e.Column.ColumnName == "Abilitato")
        {
            bool b = Convert.ToBoolean(e.ProposedValue);
            if (!b)
            {
                e.ProposedValue = true;
                return;
            }
            dt.ColumnChanging -= Dt_ColumnChanging;
            for (int i = dt.Rows.Count - 1; i >= 0; i--)
            {
                if (dt.Rows[i]["Id"] != e.Row["Id"])
                {
                    dt.Rows[i]["Abilitato"] = false;
                    dt.Rows[i].EndEdit();
                }
                
            }
            
            dt.ColumnChanging += Dt_ColumnChanging;
            
        }
    }

    private DataTable CreateDataTablePeople(string TableName)
    {
        using (DataTable dt = new DataTable(TableName))
        {
            dt.Columns.Add("ID", typeof(int));
            dt.Columns.Add("Name", typeof(string));
            dt.Columns.Add("Abilitato", typeof(bool));

            dt.LoadDataRow(new object[] { 1, "Frank", false }, true);
            dt.LoadDataRow(new object[] { 2, "Michael", false}, true);
            dt.LoadDataRow(new object[] { 3, "Paul", false }, true);

            return dt;
        }
    }

    private void dataGridView1_CurrentCellDirtyStateChanged(object sender, EventArgs e)
    {
        DataGridViewDataErrorContexts ec = DataGridViewDataErrorContexts.Commit;
        DataGridView dg = (DataGridView)sender;
        bool b = dg.CommitEdit(ec);
    }

Answer 7

您必须在 DGV 上将 VirtualMode 设置为 TRUE 以仅允许一个复选框。