使用DataGridViewComboBoxColumn获取不同的选项

时间:2011-09-02 13:24:11

标签: c# winforms datagridviewcombobox

我正在修改.NET 3.5中的Winforms应用程序。

我有一个DataGridViewComboBoxColumn,其中填充了一些硬编码选项,如下所示。

// 
// dgvCol_PropName
// 
this.dgvCol_PropName.DisplayStyle = System.Windows.Forms.DataGridViewComboBoxDisplayStyle.ComboBox;
this.dgvCol_PropName.HeaderText = "Property Name";
this.dgvCol_PropName.Items.AddRange(new object[] {
"Option1",
"Option2",
"Option3"});
this.dgvCol_PropName.Name = "dgvCol_PropName";
this.dgvCol_PropName.Width = 150;

我想选择这些选项是不同的,这样一旦网格中存在一个选项,就不能再次选择它(用户应编辑当前行或删除并重新输入)。

有快速的方法吗?

我想我会分享我的最终解决方案,以防它帮助其他人。我的CellValidating事件处理程序如下:

/// <summary>
/// Handle the validation event on the cell so that only properties that have not already been specified can be selected
/// </summary>
private void dg_FTPS_ExProps_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
{
    var dataGrid = sender as DataGridView;
    if (dataGrid != null)
    {
        // Only validate if that event is generated for the Property Name column
        string headerText = dataGrid.Columns[e.ColumnIndex].HeaderText;

        // Abort validation if cell is not in the PropertyName column.
        // Rejected using the column index in case the column order changes but
        // equally, there will be problems if the column header changes. (Pay your money and take a chance)
        if (headerText.Equals("Property Name"))
        // if (e.ColumnIndex == 0) 
        {
            // Count the number of times the property exists in the table
            int propertyCount = 0;
            foreach (DataGridViewRow row in dg_FTPS_ExProps.Rows)
            {
                if( row.Cells[ e.ColumnIndex ].EditedFormattedValue.ToString().Equals( e.FormattedValue) == true )
                {
                    propertyCount++;
                }
            }

            // Check if multiple entreies have tried to be applied
            if (propertyCount > 1)
            {
                e.Cancel = true;
            }
        }
    }
}

我喜欢使用LINQ来计算实例的数量,但我仍然在学习,所以我坚持我所知道的。

1 个答案:

答案 0 :(得分:0)

尝试在事件正文中使用此事件DataGridView.CellValidating,只需检查是否有另一行具有相同的值,并且是否只有e.Cancel设置为true