选择标头时，datagridview中的索引超出范围异常 [英] Index out of range exception in datagridview when header is selected

问题描述

我有一个datagridview，当我单击标题进行排序或出于任何原因时，在下面的代码行中出现跟随错误...。

I have a datagridview that when I click on a header to sort or for any reason I get the follow error on the following line of code....

争论我们的范围异常（索引超出范围。必须为非负且小于集合的大小。

 private void firearmView_CellClick(object sender, DataGridViewCellEventArgs e)
    {
            //I get the above error on the IF line below.
            if (!firearmView.Rows[e.RowIndex].IsNewRow) 
            {
                selectedFirearmPictureBox.Image = Image.FromFile(firearmView.Rows[e.RowIndex].Cells[12].Value.ToString(), true);
            }

    }

我不知道为什么会收到此特定错误

I do not know why I am getting this particular error here.

推荐答案

MSDN在文档中对 RowIndex属性

The MSDN says in the docs about RowIndex property

当RowIndex属性返回-1时，单元格要么是

When the RowIndex property returns -1, the cell is either a column header, or the cell's row is shared.

所以您需要处理e.RowIndex == -1当您收到事件

（...索引不得为负....）

So you need to handle the e.RowIndex == -1 when you receive the event
(...The index must not be negative....)

private void firearmView_CellClick(object sender, DataGridViewCellEventArgs e)
{

    if(e.RowIndex == -1) return;

    if (!firearmView.Rows[e.RowIndex].IsNewRow) 
    {
        selectedFirearmPictureBox.Image = Image.FromFile(firearmView.Rows[e.RowIndex].Cells[12].Value.ToString(), true);
    }
}

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