设置DataGridView 的当前单元格

        /// <summary>
        /// 设置DGV的当前单元格
        /// </summary>
        /// <param name="dgv">要设置的DGV</param>
        /// <param name="rowindex">要设置的行</param>
        /// <param name="columnindex">要设置的列</param>
        public void SetCurrentCellByDgv(DataGridView dgv,int rowindex, int columnindex)
        {
           　//DGV为Null，行或列不存在则不设置
            if(dgv==null||0>rowindex ||rowindex>=dgv.RowCount||dgv.Rows[rowindex]==null||0>columnindex ||dgv.Columns.Count <= columnindex)return;  
            DataGridViewCell cell = this.Rows[rowindex].Cells[columnindex];  
           if(cell==null)return;             
            dgv.ClearSelection();//取消选择
            dgv.CurrentCell = null;//取消当前单元格
            dgv.CurrentCell = cell;//设置当前单元格
            dgv.Focus();//dgv为窗体焦点
        }