GridView冻结列方法

 /// <summary>
        /// 冻结列开关
        /// </summary>
        public static string LockColumnTurnClick(GridView gv,string ToolStripFixed)
        {
            //冻结有焦点的列                
            int fixcolumn = 0;
            GridColumn column = gv.FocusedColumn;
            if (column == null)
                return ToolStripFixed;
            fixcolumn = column.VisibleIndex;
            switch (ToolStripFixed)
            {
                case "冻结列":
                    {
                        for (int i = 0; i < fixcolumn; i++)
                        {
                            string ColumnName = gv.VisibleColumns[i].Caption;
                            gv.VisibleColumns[i].Fixed = DevExpress.XtraGrid.Columns.FixedStyle.Left;
                        }
                        ToolStripFixed = "取消冻结列";
                    }
                    break;
                case "取消冻结列":
                    {
                        //正确的取消冻结[倒置进行取消冻结],这样就可以保证冻结前与冻结后的列的位置保持一致
                        for (int i = fixcolumn; i >= 0; i--)
                        {
                            gv.VisibleColumns[i].Fixed = DevExpress.XtraGrid.Columns.FixedStyle.None;
                        }
                        ToolStripFixed = "冻结列";
                    }
                    break;
            }
            return ToolStripFixed;
            }