dataGridview第一列问题

Question

 this.dataGridView1.RowHeadersVisible = false;  
可以隐藏 我想说的那列。  我现在想做的是  把这列 给添加一个自动增长的编号 。  我该怎么操作这列呢？

Answer 1

private void button1_Click(object sender, EventArgs e)
{
    DataTable dt = ((DataTable)(dataGridView1.DataSource));
    DataColumn dc = new DataColumn();
    dc.DataType = System.Type.GetType("System.Int32");  //指定该列的数据类型
    dc.AutoIncrement = true;                            //该列为自动增涨列
    dc.AutoIncrementSeed = 1;                           //初始值
    dc.AutoIncrementStep = 1;                           //增量
    dc.Caption = "id";                                  //设置列的标题
    dc.ColumnName = "序号";                             //设置 列集合对象中的列的名称,datagrid中显示该列名.
    dc.Unique = true;                                   //为此列创建唯一性约
    dc.AllowDBNull = false;                             //不允许为空
    dt.Columns.Add(dc);
} 

Answer 2

        /// <summary>
        /// 行头写入行号和重绘行头
        /// </summary>
        protected override void OnRowPostPaint(DataGridViewRowPostPaintEventArgs e) {
            Rectangle rectangle = new Rectangle(
                e.RowBounds.Location.X,
                e.RowBounds.Location.Y,
                this.RowHeadersWidth - 1,
                e.RowBounds.Height);            bool mouseOver = e.RowBounds.Contains(this.PointToClient(Cursor.Position));            LinearGradientBrush brush = new LinearGradientBrush(
                e.RowBounds,
                mouseOver ? Color.PeachPuff : Color.LightGray,
                Color.WhiteSmoke,
                LinearGradientMode.Vertical);            e.Graphics.FillRectangle(brush, rectangle);//重绘行头内部
            e.Graphics.DrawRectangle(new Pen(mouseOver ? Color.PeachPuff : Color.LightGray), rectangle);//重绘行头边框            if (this.Rows[e.RowIndex].Selected == true) {
                brush = new LinearGradientBrush(
                e.RowBounds,
                Color.CadetBlue,
                Color.WhiteSmoke,
                LinearGradientMode.Vertical);
                e.Graphics.FillRectangle(brush, rectangle);
                e.Graphics.DrawRectangle(new Pen(Color.CadetBlue), rectangle);
            }            //行头写入行号
            TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(), this.RowHeadersDefaultCellStyle.Font, rectangle, this.RowHeadersDefaultCellStyle.ForeColor, TextFormatFlags.VerticalCenter | TextFormatFlags.HorizontalCenter);            base.OnRowPostPaint(e);
        }

Answer 3

private void dataGridView1_RowPostPaint(object sender,    DataGridViewRowPostPaintEventArgs e)
{
     Rectangle rectangle = new Rectangle(e.RowBounds.Location.X, e.RowBounds.Location.Y,dataGridView1.RowHeadersWidth, e.RowBounds.Height);     TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(), dataGridView1.RowHeadersDefaultCellStyle.Font, rectangle, dataGridView1.RowHeadersDefaultCellStyle.ForeColor,
                TextFormatFlags.VerticalCenter | TextFormatFlags.Right);
}

Answer 4

添加datagridview的RowPostPaint事件前加上以下代码,把其中的dgvCommon替换为你的datagridviewRectangle rectangle = new Rectangle(e.RowBounds.Location.X, e.RowBounds.Location.Y, dgvCommon.RowHeadersWidth - 4, e.RowBounds.Height);
            TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(), dgvCommon.RowHeadersDefaultCellStyle.Font, rectangle, dgvCommon.RowHeadersDefaultCellStyle.ForeColor, TextFormatFlags.VerticalCenter | TextFormatFlags.Right);