dataGridView1如何进行输入判断

Question

dataGridView1 中有三列，
  Sum1,Sum2 ,Sum3
其中 Sum3=Sum1+Sum2
Sum1 < Sum2如何实现在Sum1中输入的值一定要小于Sum2,当Sum1中输入的值一定要大于Sum2会提示输入错误。

Answer 1

这个是验证datagridview 单元里面只准输入数字,你参照这个自由发挥吧..#region 进入编辑状态时
        TextBox txtCell;
        private void dgvSettleInfo_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            txtCell = new TextBox();//单元格进入编辑状态时实列化文本框
            //单元格强制转化成文本框
            txtCell = (TextBox)e.Control;
            //绑定按键事件
            txtCell.KeyPress += new KeyPressEventHandler(txtCell_KeyPress);        } 
        #endregion#region 文本框的按键事件        private void txtCell_KeyPress(object sender,KeyPressEventArgs e)
        {
            try
            {
                //输入的只准是数字，长度为7位数
                if ((char.IsNumber(e.KeyChar)) && txtCell.Text.Length < 7)
                {
                    e.Handled = false;
                }
                else
                {
                    e.Handled = true;
                }
                if ((e.KeyChar == (char)8))//允许输入退格
                {
                    e.Handled = false;
                }
            }
            catch (Exception ex)
            {                MessageBox.Show(ex.Message);
            }
        }        #endregion

Answer 2

 //在DataGridView1_CellEndEdit中
if (!DBNull.Value.Equals(dataGridView.CurrentRow.Cells["sum1"].Value) && !DBNull.Value.Equals(dataGridView.CurrentRow.Cells["sum2"].Value))
            {
if(dataGridView.CurrentRow.Cells["sum1"].Value) < dataGridView.CurrentRow.Cells["sum2"].Value}
{                dataGridView.CurrentRow.Cells[sum3].Value =dataGridView.CurrentRow.Cells["sum1"].Value) + dataGridView.CurrentRow.Cells[sum2].Value);
else
{
messageBox.Show("错误");
}            }