114
115 }
116 /**//// <summary>
117 /// 修改排序顺序
118 /// </summary>
119 protected string ModifySortExpression(string[] sortColumns, string sortExpression)
120 {
121 string ascSortExpression = String.Concat(sortExpression, " ASC ");
122 string descSortExpression = String.Concat(sortExpression, " DESC ");
123
124 for (int i = 0; i < sortColumns.Length; i )
125 {
126
127 if (ascSortExpression.Equals(sortColumns[i]))
128 {
129 sortColumns[i] = descSortExpression;
130 }
131
132 else if (descSortExpression.Equals(sortColumns[i]))
133 {
134 Array.Clear(sortColumns, i, 1);
135 }
136 }
137
138 return String.Join(",", sortColumns).Replace(",,", ",").TrimStart(",".ToCharArray());
139
140 }
141 /**//// <summary>
142 /// 获取当前的表达式对所选列进行排序
143 /// </summary>
144 protected void SearchSortExpression(string[] sortColumns, string sortColumn, out string sortOrder, out int sortOrderNo)
145 {
146 sortOrder = "";
147 sortOrderNo = -1;
148 for (int i = 0; i < sortColumns.Length; i )
149 {
150 if (sortColumns[i].StartsWith(sortColumn))
151 {
152 sortOrderNo = i 1;
153 if (AllowMultiColumnSorting)
154 {
155 sortOrder = sortColumns[i].Substring(sortColumn.Length).Trim();
156 }
157 else
158 {
159 sortOrder = ((SortDirection == SortDirection.Ascending) ? "ASC" : "DESC");
160 }
161 }
162 }
163 }
164 /**//// <summary>
165 /// 绘制升序降序的图片
166 /// </summary>
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);
188
189 }
190 else
191 {
192
193 if (AllowMultiColumnSorting)
194 {
195 Literal litSortSeq = new Literal();
196 litSortSeq.Text = sortOrderNo.ToString();
197 dgItem.Cells[i].Controls.Add(litSortSeq);
198
199 }
200 }
201 }
202 }
203 }
204
205 }
206 #endregion
207 }
第二：详尽的分页信息显示，此功能没有封装成控件形式，直接在GridView_DataBound事件中对尾页操作即可。
下面是多列排序与分页显示代码的演示
<script runat="server">
void PageDropDownList_SelectedIndexChanged(Object sender, EventArgs e)
{
GridViewRow pagerRow = CustomersGridView.BottomPagerRow;
DropDownList pageList = (DropDownList)pagerRow.Cells[0].FindControl("PageDropDownList");
CustomersGridView.PageIndex = pageList.SelectedIndex;
}
void CustomersGridView_DataBound(Object sender, EventArgs e)
{
GridViewRow pagerRow = CustomersGridView.BottomPagerRow;
LinkButton linkBtnFirst = (LinkButton)pagerRow.Cells[0].FindControl("linkBtnFirst");
LinkButton linkBtnPrev = (LinkButton)pagerRow.Cells[0].FindControl("linkBtnPrev");
LinkButton linkBtnNext = (LinkButton)pagerRow.Cells[0].FindControl("linkBtnNext");
LinkButton linkBtnLast = (LinkButton)pagerRow.Cells[0].FindControl("linkBtnLast");
if (CustomersGridView.PageIndex == 0)
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