我想文本框列应该是C＃中datagridview中的DateTime列？

Question

i am writing the following code in cell formatting event of datagridview in c#

this.dgvfrm.Columns["expdt"].DefaultCellStyle.Format = "dd/MM/yyyy";

after writing this when i enter dd/MM/yyyy format in datagridview textbox column it shows an error. I show you the image

i don't understand what i want to do know?

Answer 1

之所以会出现此错误，是因为数据网格单元中的值（至少其中一个）不是有效的日期和时间，并且无法以这种方式进行格式化。

Answer 2

Have you tryed something like this :

private void dgvfrm_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    if(e.ColumnIndex != yourFormattigColumnIndex || e.Value == null)  //Added the null check
        return;

    dgvfrm.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = ((DateTime)e.Value).ToString("dd/MM/yyyy");
}

I think this should work (might have some typo/syntax but the idea is there)