急啊!!!!!C#中未将对象引用设置到对象的实例

Question

private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            txtid.Text = dataGridView1.SelectedCells[0].Value.ToString().Trim();
            txtname.Text = dataGridView1.SelectedCells[1].Value.ToString().Trim();
            txtsex.Text = dataGridView1.SelectedCells[2].Value.ToString().Trim();
            txttel.Text = dataGridView1.SelectedCells[3].Value.ToString().Trim();
            txtqq.Text = dataGridView1.SelectedCells[4].Value.ToString().Trim();
            txtworktel.Text = dataGridView1.SelectedCells[5].Value.ToString().Trim();
            txtemail.Text = dataGridView1.SelectedCells[6].Value.ToString().Trim();
            txtmobile.Text = dataGridView1.SelectedCells[7].Value.ToString().Trim();
        }
为何总是说未将对象引用设置到对象的实例 

Answer 1

断点看看到哪一句报错，应该是值为NULL把

Answer 2

private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e) 
        { 
            txtid.Text =dataGridView1.SelectedCells[0].Value!=null? dataGridView1.SelectedCells[0].Value.ToString().Trim():""; 
            txtname.Text =dataGridView1.SelectedCells[1].Value!=null? dataGridView1.SelectedCells[1].Value.ToString().Trim():"";
            txtsex.Text =dataGridView1.SelectedCells[2].Value!=null?  dataGridView1.SelectedCells[2].Value.ToString().Trim():"";
            txttel.Text =dataGridView1.SelectedCells[3].Value!=null?  dataGridView1.SelectedCells[3].Value.ToString().Trim():""; 
            txtqq.Text =dataGridView1.SelectedCells[4].Value!=null?  dataGridView1.SelectedCells[4].Value.ToString().Trim():""; 
            ...
        } 

Answer 3

dataGridView中的cell没有那么多。如只有6个，你用了cells[6]就不可能的。
请查一下。

Answer 4

加上e.Row.RowType 的条件判断 判断是只有数据行的时候做操作，你这样是包含头的肯定是错误了。

Answer 5

private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e) 
        { 
 txtid.Text = dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString().Trim();
            txtname.Text = dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString().Trim();
            txtsex.Text = dataGridView1.Rows[e.RowIndex].Cells[2].Value.ToString().Trim();
            txttel.Text = dataGridView1.Rows[e.RowIndex].Cells[3].Value.ToString().Trim();
            txtqq.Text = dataGridView1.Rows[e.RowIndex].Cells[4].Value.ToString().Trim();
            txtworktel.Text = dataGridView1.Rows[e.RowIndex].Cells[5].Value.ToString().Trim();
            txtemail.Text = dataGridView1.Rows[e.RowIndex].Cells[6].Value.ToString().Trim();
            txtmobile.Text = dataGridView1.Rows[e.RowIndex].Cells[7].Value.ToString().Trim(); 
}
这样看看.

Answer 6

而且我看你好象是想把选中行的数据显示到textbox里面，那就把dataGridView1的SelectionMode设为FullRowSelect，
然后dgv.SelectedRows[0].Cells[0].Value.ToString().Trim()来获值。另外要先判断下SelectedRows或者SelectedCells的count值是不是0