[英]How to check if a cell in DataGridView exist?
I have a static method that check the sum of an given column. 我有一个静态方法来检查给定列的总和。 I am using it on event RowsAdded
but I got the following error: 我在事件“行RowsAdded
上使用它,但出现以下错误:
System.NullReferenceException was unhandled
Message=Object reference not set to an instance of an object.
Here is my code, please tell me where I am wrong 这是我的代码,请告诉我哪里错了
public static decimal datagSum(DataGridView dgv, string colName)
{
int i = dgv.RowCount - 1, j = 0;
decimal dgvSum = 0;
decimal k = 0;
while (j < i)
{
if (dgv.Rows[(i - 1)].Cells.Count > 3)
{
if (decimal.TryParse(dgv.Rows[(i - 1)].Cells[colName].Value.ToString(), out k))
{
dgvSum += k;
}
j++;
}
}
return dgvSum;
}
Code Snippet 代码段
if (dataGridView1.Columns[e.ColumnIndex].Name == "CompanyName")
{
if (String.IsNullOrEmpty(e.FormattedValue.ToString()))
{
dataGridView1.Rows[e.RowIndex].ErrorText =
"Company Name must not be empty";
e.Cancel = true;
}
}
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