163 }
164 /**////
165 /// 绘制升序降序的图片
166 ///
167 protected void DisplaySortOrderImages(string sortExpression, GridViewRow dgItem)
168 {
169 string[] sortColumns = sortExpression.Split(",".ToCharArray());
170
171 for (int i = 0; i < dgItem.Cells.Count; i++)
172 {
173 if (dgItem.Cells[i].Controls.Count > 0 && dgItem.Cells[i].Controls[0] is LinkButton)
174 {
175 string sortOrder;
176 int sortOrderNo;
177 string column = ((LinkButton)dgItem.Cells[i].Controls[0]).CommandArgument;
178 SearchSortExpression(sortColumns, column, out sortOrder, out sortOrderNo);
179 if (sortOrderNo > 0)
180 {
181 string sortImgLoc = (sortOrder.Equals("ASC") ? SortAscImageUrl : SortDescImageUrl);
182
183 if (sortImgLoc != String.Empty)
184 {
185 Image imgSortDirection = new Image();
186 imgSortDirection.ImageUrl = sortImgLoc;
187 dgItem.Cells[i].Controls.Add(imgSortDirection);
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