C＃DataGridView标题

Question

首先，我对编程很感兴趣（第一周）。我有一个datagridviewer和CellClick事件。我的功能是什么，获取行的所选（鼠标左键单击）单元格的第一列值。 等;

ID名称地址（这是gridview的标题）

1 User1 Address1

2 User2 Address2

.. .. 6,7

9 User9 Address9

当您单击任何单元格时 - 除了标题 - 它会给出第一列的值。当您单击时，Address9您的值将返回为9等。

单击标题单元格时出现outofexception错误。返回-1值并崩溃。因此，我需要一个if语句来忽略标题点击。我在网站上搜索过它并尝试过很多东西但是没有成功实现这一点。

private void dgwCust_CellClick(object sender, DataGridViewCellEventArgs e)       
{            

if ( cellclick == isn't a header click?.. ) 

            string search;
            search = dgwCust.Rows[e.RowIndex].Cells[0].Value.ToString();//this is where error comes in
            SqlCommand cmdsearch = new SqlCommand("Select * from Customers where CustomerID = '" + search + "'", dbConnection);
            try
            { 

等。

Answer 1

使用以下

之一检查e.RowIndex是否不等于-1

if (!e.RowIndex.Equals(-1))

或

if (e.RowIndex != -1)

-

private void dgwCust_CellClick(object sender, DataGridViewCellEventArgs e)       
{            

    if (!e.RowIndex.Equals(-1)) 

        string search;
        search = dgwCust.Rows[e.RowIndex].Cells[0].Value.ToString();//this is where error comes in
        SqlCommand cmdsearch = new SqlCommand("Select * from Customers where CustomerID = '" + search + "'", dbConnection);
        try
        { 

Answer 2

if (e.RowIndex >= 0)
{
  string search;
  search = dgwCust.Rows[e.RowIndex].Cells[0].Value.ToString();//this is where error comes in
  SqlCommand cmdsearch = new SqlCommand("Select * from Customers where CustomerID = '" + search + "'", dbConnection);
  //...
}