[英]Check whether data in cell of datagridview is null
My DataGridView is bound to a database query result via a SqlDataReader
, and when I test a cell value for null
, I'm getting unexpected results. 我的DataGridView通过SqlDataReader
绑定到数据库查询结果,当我测试单元格值为null
,我得到了意外的结果。
My code is something like this: 我的代码是这样的:
SqlConnection con = new SqlConnection(
"Data Source = .;Initial Catalog = SAHS;integrated security = true");
con.Open();
SqlCommand cmd3 = new SqlCommand(
"select Status from vw_stdtfeedetail
where Std= 6 and Div ='B' and name='bbkk' and mnthname ='June'", con);
SqlDataReader dr = cmd3.ExecuteReader();
BindingSource bs = new BindingSource();
bs.DataSource = dr;
dataGridView3.DataSource = bs;
this.monthFeeTableAdapter.Fill(this.sAHSDataSet4.MonthFee);
if (dataGridView3.CurrentCell.Value == null)
{
MessageBox.Show("Pending");
}
else
{
MessageBox.Show("Already Paid");
}
I'm getting output Already Paid even though the value from database is null . 即使数据库中的值为null,我仍将获得输出Already Paid 。
Try using DBNull.Value
instead of null
尝试使用DBNull.Value
而不是null
if (dataGridView3.CurrentCell.Value == DBNull.Value)
{
MessageBox.Show("Pending");
}
else
{
MessageBox.Show("Already Paid");
}
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