扩展GridView控件(2) - 复合排序和排序状态提示

简介:
GridView既强大又好用。为了让它更强大、更好用,我们来写一个继承自GridView的控件。
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扩展GridView控件(2) - 复合排序和排序状态提示


作者: webabcd
/*正式版的实现 开始*/
 
介绍
扩展GridView控件:
对多个字段进行复合排序;升序、降序的排序状态提示

使用方法(设置SmartSorting复合属性):
AllowSortTip - 是否启用排序提示
AllowMultiSorting - 是否启用复合排序
SortAscImageUrl - 升序提示图片的URL(不设置则使用默认图片)
SortDescImageUrl - 降序提示图片的URL(不设置则使用默认图片)
SortAscText - 升序提示文本
SortDescText - 降序提示文本


关键代码
using System; 
using System.Collections.Generic; 
using System.Text; 
 
using System.Web.UI.WebControls; 
using System.Web.UI; 
 
namespace YYControls.SmartGridViewFunction 

         /// <summary> 
         /// 扩展功能:复合排序和排序状态提示 
         /// </summary> 
         public  class SmartSortingFunction : ExtendFunction 
        { 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 public SmartSortingFunction() 
                        :  base() 
                { 
 
                } 
 
                 /// <summary> 
                 /// 构造函数 
                 /// </summary> 
                 /// <param name="sgv">SmartGridView对象</param> 
                 public SmartSortingFunction(SmartGridView sgv) 
                        :  base(sgv) 
                { 
 
                } 
 
                 /// <summary> 
                 /// 扩展功能的实现 
                 /// </summary> 
                 protected  override  void Execute() 
                { 
                         // 开启SmartGridView的排序功能 
                         // this._sgv.AllowSorting = true; 
 
                         this._sgv.Sorting +=  new System.Web.UI.WebControls.GridViewSortEventHandler(_sgv_Sorting); 
                         this._sgv.RowDataBoundCell +=  new SmartGridView.RowDataBoundCellHandler(_sgv_RowDataBoundCell); 
                } 
 
                 /// <summary> 
                 /// SmartGridView的RowDataBoundCell事件 
                 /// </summary> 
                 /// <param name="sender"></param> 
                 /// <param name="gvtc"></param> 
                 void _sgv_RowDataBoundCell( object sender, GridViewTableCell gvtc) 
                { 
                         if (!String.IsNullOrEmpty( this._sgv.SortExpression)    
                                &&  this._sgv.SmartSorting.AllowSortTip 
                                && gvtc.RowType == DataControlRowType.Header) 
                        { 
                                 // 显示排序状态提示 
                                DisplaySortTip( this._sgv.SortExpression, gvtc.TableCell); 
                        } 
                } 
 
                 /// <summary> 
                 /// Sorting事件 
                 /// </summary> 
                 /// <param name="sender"></param> 
                 /// <param name="e"></param> 
                 void _sgv_Sorting( object sender, System.Web.UI.WebControls.GridViewSortEventArgs e) 
                { 
                         // 如果允许复合排序的话,则设置复合排序表达式 
                         if ( this._sgv.SmartSorting.AllowMultiSorting) 
                        { 
                                e.SortExpression = GetSortExpression(e); 
                        } 
                } 
 
                 /// <summary> 
                 /// 获得复合排序表达式 
                 /// </summary> 
                 /// <param name="e"></param> 
                 /// <returns></returns> 
                 protected  string GetSortExpression(GridViewSortEventArgs e) 
                { 
                         string[] sortColumns =  null
                         string sortAttribute =  this._sgv.SortExpression; 
 
                         if (!String.IsNullOrEmpty(sortAttribute)) 
                        { 
                                sortColumns = sortAttribute.Split(','); 
                        } 
 
                         // 如果原排序表达式有当前排序字段 
                         if (sortAttribute.IndexOf(e.SortExpression) != -1) 
                        { 
                                 // 更新排序表达式 
                                sortAttribute = ModifySortExpression(sortColumns, e.SortExpression); 
                        } 
                         else 
                        { 
                                 // 为原排序表达式添加新的排序规则(升序) 
                                sortAttribute += String.Concat( ",", e.SortExpression,  " ASC"); 
                        } 
 
                         return sortAttribute.Trim(','); 
                } 
 
                 /// <summary> 
                 /// 更新排序表达式 
                 /// </summary> 
                 /// <param name="sortColumns">各个字段的排序表达式数组</param> 
                 /// <param name="sortExpression">当前需要排序的字段(该字段在sortColumns数组中)</param> 
                 /// <returns></returns> 
                 protected  string ModifySortExpression( string[] sortColumns,  string sortExpression) 
                { 
                         // 当前需要排序的字段的升序表达式 
                         string ascSortExpression = String.Concat(sortExpression,  " ASC"); 
                         // 当前需要排序的字段的降序表达式 
                         string descSortExpression = String.Concat(sortExpression,  " DESC"); 
 
                         for ( int i = 0; i < sortColumns.Length; i++) 
                        { 
                                 // 各个字段的排序表达式数组中,有当前需要排序的字段的升序表达式 
                                 if (ascSortExpression.Equals(sortColumns[i])) 
                                { 
                                         // 当前排序字段由升序变为降序 
                                        sortColumns[i] = descSortExpression; 
                                         break
                                } 
                                 // 各个字段的排序表达式数组中,有当前需要排序的字段的降序表达式 
                                 else  if (descSortExpression.Equals(sortColumns[i])) 
                                { 
                                         // 从各个字段的排序表达式数组中,删除当前需要排序的字段 
                                        Array.Clear(sortColumns, i, 1); 
                                         break
                                } 
                        } 
 
                         return String.Join( ",", sortColumns).Replace( ",,"",").Trim(','); 
                } 
 
                 /// <summary> 
                 /// 显示排序状态提示 
                 /// </summary> 
                 /// <param name="sortExpression">排序表达式</param> 
                 /// <param name="tc">Header的TableCell</param> 
                 protected  void DisplaySortTip( string sortExpression, TableCell tc) 
                { 
                         string[] sortColumns = sortExpression.Split(','); 
 
                         if (tc.Controls.Count > 0 && tc.Controls[0]  is LinkButton) 
                        { 
                                 string columnName = ((LinkButton)tc.Controls[0]).CommandArgument; 
 
                                 int sortOrderIndex = Array.FindIndex(sortColumns,  delegate( string s) {  return s.IndexOf(columnName) != -1; }); 
 
                                 // 如果排序表达式中有当前列 
                                 if (sortOrderIndex != -1) 
                                { 
                                         // 当前列应该是升序还是降序(区分两种情况:复合排序和非复合排序) 
                                        SortDirection sortDirection = SortDirection.Ascending; 
                                         if ( this._sgv.SmartSorting.AllowMultiSorting && sortColumns[sortOrderIndex].IndexOf( "DESC") != -1) 
                                        { 
                                                sortDirection = SortDirection.Descending; 
                                        } 
                                         else  if (! this._sgv.SmartSorting.AllowMultiSorting &&  this._sgv.SortDirection == SortDirection.Descending) 
                                        { 
                                                sortDirection = SortDirection.Descending; 
                                        } 
 
                                         // 排序状态提示(图片地址) 
                                         string sortImageUrl =  null
                                         // 排序状态提示(文本) 
                                         string sortText =  null
                                         if (sortDirection == SortDirection.Ascending) 
                                        { 
                                                sortText =  this._sgv.SmartSorting.SortAscText; 
 
                                                sortImageUrl =  this._sgv.SmartSorting.SortAscImageUrl; 
 
                                                 if (String.IsNullOrEmpty(sortImageUrl)) 
                                                { 
                                                        sortImageUrl =    
                                                                 this._sgv.Page.ClientScript.GetWebResourceUrl 
                                                                ( 
                                                                         this.GetType(), 
                                                                         "YYControls.SmartGridView.Resources.Asc.gif" 
                                                                ); 
                                                } 
                                        } 
                                         else 
                                        { 
                                                sortText =  this._sgv.SmartSorting.SortDescText; 
 
                                                sortImageUrl =  this._sgv.SmartSorting.SortDescImageUrl; 
 
                                                 if (String.IsNullOrEmpty(sortImageUrl)) 
                                                { 
                                                        sortImageUrl =    
                                                                 this._sgv.Page.ClientScript.GetWebResourceUrl 
                                                                ( 
                                                                         this.GetType(), 
                                                                         "YYControls.SmartGridView.Resources.Desc.gif" 
                                                                ); 
                                                } 
                                        } 
 
                                         // 添加排序状态提示图片 
                                        Image imgSortDirection =  new Image(); 
                                        imgSortDirection.ImageUrl = sortImageUrl; 
                                        tc.Controls.Add(imgSortDirection); 
 
                                         // 添加排序状态提示文本 
                                        tc.Controls.Add( new LiteralControl(sortText)); 
 
                                         if ( this._sgv.SmartSorting.AllowMultiSorting) 
                                        { 
                                                 // 添加排序状态提示序号 
                                                tc.Controls.Add( new LiteralControl((sortOrderIndex + 1).ToString())); 
                                        } 
 
不用资源文件,又没有设置排序状态提示时的逻辑(已经注释掉了) #region 不用资源文件,又没有设置排序状态提示时的逻辑(已经注释掉了) 
                                         //// 添加排序状态提示图标 
                                         //Label lblSortDirection = new Label(); 
                                         //// 被注释的代码使用的是webdings,但是FF不支持,所以放弃了 
                                         //// lblSortDirection.Font.Name = "webdings"
                                         //// lblSortDirection.EnableTheming = false
                                         //if (sortDirection == SortDirection.Ascending) 
                                         //{ 
                                         //        // lblSortDirection.Text = "5"; 
                                         //        lblSortDirection.Text = "▲"; 
                                         //} 
                                         //else 
                                         //{ 
                                         //        // lblSortDirection.Text = "6"; 
                                         //        lblSortDirection.Text = "▼"; 
                                         //} 
                                         //tc.Controls.Add(lblSortDirection); 
 
                                         //if (this._sgv.SmartSorting.AllowMultiSorting) 
                                         //{ 
                                         //        // 添加排序状态提示序号 
                                         //        tc.Controls.Add(new LiteralControl((sortOrderIndex + 1).ToString())); 
                                         //} 
                                        #endregion 
 
                                }  // if (sortOrderIndex != -1) 
                        }  // if (tc.Controls.Count > 0 && tc.Controls[0] is LinkButton) 
                } 
        } 
}
 
/*正式版的实现 结束*/
 
 




     本文转自webabcd 51CTO博客,原文链接:http://blog.51cto.com/webabcd/345446,如需转载请自行联系原作者

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