DataGridView技巧

一. 关于Column

http://stackoverflow.com/questions/18666582/datagridview-autofit-and-fill

1.Column覆盖所有width:

```
dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
```

2.自动对匹配长度

a)dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
b)设置dgv的DataSource,使得他有Column
c)调用dgv.AdjustColumns<T>()

二. 在每一行Row的Header中显示行数

 1. 在RowPostPaint中加入代码:
 2. `var grid = sender as DataGridView;
        var rowIdx = (e.RowIndex + 1).ToString();

        var centerFormat = new StringFormat()
        {
            // right alignment might actually make more sense for numbers
            Alignment = StringAlignment.Center,
            LineAlignment = StringAlignment.Center
        };

        var headerBounds = new Rectangle(
            e.RowBounds.Left, 
            e.RowBounds.Top, 
            grid.RowHeadersWidth, 
            e.RowBounds.Height);
        e.Graphics.DrawString(
            rowIdx, 
            this.Font, 
            SystemBrushes.ControlText, 
            headerBounds, 
            centerFormat);`