GridView绑定自定义数据源（list）排序问题
2009-08-05 12:08 kwjlk 阅读(2491) 评论(0) 编辑 收藏 举报
问题：将list数据源绑定到GridView后，排序没有效果。e.SortDirection始终是SortDirection.Ascending。
Code
将list数据源以Gridview1.DataSource的方式绑定到GridView1
default2.aspx的代码
Code
default2.aspx.cs的代码
1 using System;
2 using System.Data;
3 using System.Configuration;
4 using System.Collections;
5 using System.Web;
6 using System.Web.Security;
7 using System.Web.UI;
8 using System.Web.UI.WebControls;
9 using System.Web.UI.WebControls.WebParts;
10 using System.Web.UI.HtmlControls;
11 using System.Web.UI.MobileControls;
12 using System.Collections.Generic;
13 using myWebUserControl;
14 using System.Reflection;
15
16
17 [Serializable]
18 public class mySize
19 {
20 private int _Size = 0;
21
22 public int Size
23 {
24 get { return _Size; }
25 set { _Size = value; }
26 }
27
28
29 public mySize(int size)
30 {
31 Size=size;
32 }
33 }
34
35 [Serializable]
36 public class myFile
37 {
38 private DateTime _FileName ;
39
40 public DateTime FileName
41 {
42 get { return _FileName; }
43 set { _FileName = value; }
44 }
45 private mySize _mySize = null;
46
47 public mySize mySize
48 {
49 get { return _mySize; }
50 set { _mySize = value; }
51 }
52 public myFile(DateTime filename,int size)
53 {
54 FileName = filename;
55 mySize = new mySize(size);
56 }
57 }
58
59 public partial class Default2 : System.Web.UI.Page
60 {
61
62 DateTime date = DateTime.Now;
63 BindListGridViewSortUtil bindListUtil = null;
64 protected void Page_Load(object sender, EventArgs e)
65 {
66
67 if (!IsPostBack||ViewState["bindUtil"]==null)
68 {
69
70 List<myFile> filelist = new List<myFile>();
71 for (int i = 0; i < 250; i++)
72 {
73 date = date.AddDays(1);
74 filelist.Add(new myFile(date, i));
75 }
76
77 GridView1.AllowPaging = true;
78 GridView1.AllowSorting = true;
79
80 bindListUtil = new BindListGridViewSortUtil();
81 bindListUtil.Result = filelist;
82 ViewState["bindUtil"] = bindListUtil;
83 }
84
85
86 if (ViewState["bindUtil"] != null)
87 {
88 bindListUtil = (BindListGridViewSortUtil)ViewState["bindUtil"];
89 }
90 bindListUtil.BindListToGridView<myFile>(GridView1, null);
91 GridView1.DataBind();
92 }
93
94 }
95
96 [Serializable]
97 public class BindListGridViewSortUtil
98 {
99
100 #region Filed
101 private object _Result = new object();
102
103 /// <summary>
104 /// 排序后的结果集
105 /// </summary>
106 public object Result
107 {
108 get { return _Result; }
109 set { _Result = value; }
110 }
111
112 private bool _AutoFill = true;
113
114 /// <summary>
115 /// 自动填充模式，即如果内部结果集Result有值，则优先使用内部结果集进行填充。
116 /// </summary>
117 public bool AutoFill
118 {
119 get { return _AutoFill; }
120 set { _AutoFill = value; }
121 }
122
123 private string _SortExpression = "";
124
125 /// <summary>
126 /// 要进行排序的！属性！名称
127 /// </summary>
128 public string SortExpression
129 {
130 get { return _SortExpression; }
131 }
132
133 private System.Web.UI.WebControls.SortDirection _mySortDirection = System.Web.UI.WebControls.SortDirection.Ascending;
134
135 /// <summary>
136 /// GridView的排序方式，递增，递减
137 /// </summary>
138 public System.Web.UI.WebControls.SortDirection mySortDirection
139 {
140 get { return _mySortDirection; }
141 //set { _mySortDirection = value; }
142 }
143
144 #endregion
145
146
147 #region Methods
148 /// <summary>
149 /// GridView的分页响应事件
150 /// </summary>
151 /// <param name="sender"></param>
152 /// <param name="e"></param>
153 public void BindListGridView1_PageIndexChanging(object sender, System.Web.UI.WebControls.GridViewPageEventArgs e)
154 {
155 System.Web.UI.WebControls.GridView bindListGridView = sender as System.Web.UI.WebControls.GridView;
156 if (sender == null)
157 {
158 return;
159 }
160 bindListGridView.PageIndex = e.NewPageIndex;
161 bindListGridView.DataBind();
162 }
163
164 /// <summary>
165 /// GridView的排序响应时间
166 /// </summary>
167 /// <typeparam name="T"></typeparam>
168 /// <param name="sender"></param>
169 /// <param name="e"></param>
170 public void BindListGridView1_Sorting<T>(object sender, System.Web.UI.WebControls.GridViewSortEventArgs e)
171 {
172 System.Web.UI.WebControls.GridView bindListGridView = sender as System.Web.UI.WebControls.GridView;
173 if (sender == null)
174 {
175 return;
176 }
177
178 _SortExpression = e.SortExpression;
179 List<T> sortResult=new List<T>();
180
181 sortResult = ListSort<T>(bindListGridView.DataSource as List<T>); //对DataSource进行升序排序
182
183
184 if (mySortDirection == System.Web.UI.WebControls.SortDirection.Ascending)
185 {
186 _mySortDirection = System.Web.UI.WebControls.SortDirection.Descending;
187 }
188 else
189 {
190 sortResult.Reverse(); //如果需要降序排序，则将结果倒转一次。
191 _mySortDirection = System.Web.UI.WebControls.SortDirection.Ascending;
192 }
193
194 Result = sortResult;
195 bindListGridView.DataSource = sortResult;
196 bindListGridView.DataBind();
197 }
198
199
200 /// <summary>
201 /// 对List按照特定属性进行排序
202 /// </summary>
203 /// <typeparam name="T">List<T>中存储的变量类型</typeparam>
204 /// <param name="list"></param>
205 /// <returns></returns>
206 public System.Collections.Generic.List<T> ListSort<T>(System.Collections.Generic.List<T> list)
207 {
208 if (list == null)
209 {
210 return null;
211 }
212
213 list.Sort(new Comparison<T>(CompareBigThan<T>));
214 return list;
215 }
216
217 /// <summary>
218 /// 对两个特定类型的变量按照其中某个属性的大小进行排序
219 /// </summary>
220 /// <typeparam name="T">该变量的类型</typeparam>
221 /// <param name="objA">比较值一</param>
222 /// <param name="objB">比较值二</param>
223 /// <returns>结果</returns>
224 public int myCompare<T>(T objA, T objB)
225 {
226 if (objA == null || objB == null)
227 {
228 return 0; //任意一个比较值为null就返回0值。
229 }
230
231 System.Type t = objA.GetType();
232 System.Reflection.PropertyInfo p = t.GetProperty(SortExpression);
233
234 if (p != null)
235 {
236 object objA_Comparevalue = p.GetValue(objA, null);
237 object objB_Comparevalue = p.GetValue(objB, null);
238
239 //
240 //判断该属性的类型，并按该类型的比较方式进行比较
241 //
242 //
243
244 if (objA_Comparevalue.GetType() == typeof(DateTime))
245 {
246 return DateTime.Compare((DateTime)objA_Comparevalue, (DateTime)objB_Comparevalue);
247 }
248 if (objA_Comparevalue.GetType() == typeof(int))
249 {
250 return (int)objA_Comparevalue - (int)objB_Comparevalue;
251 }
252 if (objA_Comparevalue.GetType() == typeof(string))
253 {
254 return string.Compare(objA_Comparevalue.ToString(), objB_Comparevalue.ToString());
255 }
256 if (objA_Comparevalue.GetType() == typeof(long))
257 {
258 return (int)((long)objA_Comparevalue - (long)objB_Comparevalue);
259 }
260 if (objA_Comparevalue.GetType() == typeof(double))
261 {
262 return (int)((double)objA_Comparevalue - (double)objB_Comparevalue);
263 }
264
265
266 return 0;
267
268 }
269
270 return 0;
271 //
272 //比较值的类型中没有该属性，以及不在能进行比较范围内的类型返回值为0。
273 //
274 }
275
276 public int CompareBigThan<T>(T objA, T objB)
277 {
278 return myCompare<T>(objB, objA);
279 }
280
281 /// <summary>
282 /// 将数据源绑定到GridView
283 /// </summary>
284 /// <typeparam name="T">数据源对象的类型</typeparam>
285 /// <param name="gridViewToBind">GridView对象</param>
286 /// <param name="dataSource">绑定到GridView的数据源。当AutoFile为false时或Result结果集无值时使用该值。</param>
287 public void BindListToGridView<T>(System.Web.UI.WebControls.GridView gridViewToBind, List<T> dataSource)
288 {
289 gridViewToBind.PageIndexChanging += new GridViewPageEventHandler(this.BindListGridView1_PageIndexChanging);
290 gridViewToBind.Sorting += new GridViewSortEventHandler(this.BindListGridView1_Sorting<T>);
291
292
293 List<T> data = this.Result as List<T>;
294
295 if (AutoFill&&data!=null)
296 {
297 gridViewToBind.DataSource = (List<T>)this.Result;
298 }
299 else
300 {
301 gridViewToBind.DataSource=dataSource;
302 }
303 }
304
305 #endregion
306 }
2 using System.Data;
3 using System.Configuration;
4 using System.Collections;
5 using System.Web;
6 using System.Web.Security;
7 using System.Web.UI;
8 using System.Web.UI.WebControls;
9 using System.Web.UI.WebControls.WebParts;
10 using System.Web.UI.HtmlControls;
11 using System.Web.UI.MobileControls;
12 using System.Collections.Generic;
13 using myWebUserControl;
14 using System.Reflection;
15
16
17 [Serializable]
18 public class mySize
19 {
20 private int _Size = 0;
21
22 public int Size
23 {
24 get { return _Size; }
25 set { _Size = value; }
26 }
27
28
29 public mySize(int size)
30 {
31 Size=size;
32 }
33 }
34
35 [Serializable]
36 public class myFile
37 {
38 private DateTime _FileName ;
39
40 public DateTime FileName
41 {
42 get { return _FileName; }
43 set { _FileName = value; }
44 }
45 private mySize _mySize = null;
46
47 public mySize mySize
48 {
49 get { return _mySize; }
50 set { _mySize = value; }
51 }
52 public myFile(DateTime filename,int size)
53 {
54 FileName = filename;
55 mySize = new mySize(size);
56 }
57 }
58
59 public partial class Default2 : System.Web.UI.Page
60 {
61
62 DateTime date = DateTime.Now;
63 BindListGridViewSortUtil bindListUtil = null;
64 protected void Page_Load(object sender, EventArgs e)
65 {
66
67 if (!IsPostBack||ViewState["bindUtil"]==null)
68 {
69
70 List<myFile> filelist = new List<myFile>();
71 for (int i = 0; i < 250; i++)
72 {
73 date = date.AddDays(1);
74 filelist.Add(new myFile(date, i));
75 }
76
77 GridView1.AllowPaging = true;
78 GridView1.AllowSorting = true;
79
80 bindListUtil = new BindListGridViewSortUtil();
81 bindListUtil.Result = filelist;
82 ViewState["bindUtil"] = bindListUtil;
83 }
84
85
86 if (ViewState["bindUtil"] != null)
87 {
88 bindListUtil = (BindListGridViewSortUtil)ViewState["bindUtil"];
89 }
90 bindListUtil.BindListToGridView<myFile>(GridView1, null);
91 GridView1.DataBind();
92 }
93
94 }
95
96 [Serializable]
97 public class BindListGridViewSortUtil
98 {
99
100 #region Filed
101 private object _Result = new object();
102
103 /// <summary>
104 /// 排序后的结果集
105 /// </summary>
106 public object Result
107 {
108 get { return _Result; }
109 set { _Result = value; }
110 }
111
112 private bool _AutoFill = true;
113
114 /// <summary>
115 /// 自动填充模式，即如果内部结果集Result有值，则优先使用内部结果集进行填充。
116 /// </summary>
117 public bool AutoFill
118 {
119 get { return _AutoFill; }
120 set { _AutoFill = value; }
121 }
122
123 private string _SortExpression = "";
124
125 /// <summary>
126 /// 要进行排序的！属性！名称
127 /// </summary>
128 public string SortExpression
129 {
130 get { return _SortExpression; }
131 }
132
133 private System.Web.UI.WebControls.SortDirection _mySortDirection = System.Web.UI.WebControls.SortDirection.Ascending;
134
135 /// <summary>
136 /// GridView的排序方式，递增，递减
137 /// </summary>
138 public System.Web.UI.WebControls.SortDirection mySortDirection
139 {
140 get { return _mySortDirection; }
141 //set { _mySortDirection = value; }
142 }
143
144 #endregion
145
146
147 #region Methods
148 /// <summary>
149 /// GridView的分页响应事件
150 /// </summary>
151 /// <param name="sender"></param>
152 /// <param name="e"></param>
153 public void BindListGridView1_PageIndexChanging(object sender, System.Web.UI.WebControls.GridViewPageEventArgs e)
154 {
155 System.Web.UI.WebControls.GridView bindListGridView = sender as System.Web.UI.WebControls.GridView;
156 if (sender == null)
157 {
158 return;
159 }
160 bindListGridView.PageIndex = e.NewPageIndex;
161 bindListGridView.DataBind();
162 }
163
164 /// <summary>
165 /// GridView的排序响应时间
166 /// </summary>
167 /// <typeparam name="T"></typeparam>
168 /// <param name="sender"></param>
169 /// <param name="e"></param>
170 public void BindListGridView1_Sorting<T>(object sender, System.Web.UI.WebControls.GridViewSortEventArgs e)
171 {
172 System.Web.UI.WebControls.GridView bindListGridView = sender as System.Web.UI.WebControls.GridView;
173 if (sender == null)
174 {
175 return;
176 }
177
178 _SortExpression = e.SortExpression;
179 List<T> sortResult=new List<T>();
180
181 sortResult = ListSort<T>(bindListGridView.DataSource as List<T>); //对DataSource进行升序排序
182
183
184 if (mySortDirection == System.Web.UI.WebControls.SortDirection.Ascending)
185 {
186 _mySortDirection = System.Web.UI.WebControls.SortDirection.Descending;
187 }
188 else
189 {
190 sortResult.Reverse(); //如果需要降序排序，则将结果倒转一次。
191 _mySortDirection = System.Web.UI.WebControls.SortDirection.Ascending;
192 }
193
194 Result = sortResult;
195 bindListGridView.DataSource = sortResult;
196 bindListGridView.DataBind();
197 }
198
199
200 /// <summary>
201 /// 对List按照特定属性进行排序
202 /// </summary>
203 /// <typeparam name="T">List<T>中存储的变量类型</typeparam>
204 /// <param name="list"></param>
205 /// <returns></returns>
206 public System.Collections.Generic.List<T> ListSort<T>(System.Collections.Generic.List<T> list)
207 {
208 if (list == null)
209 {
210 return null;
211 }
212
213 list.Sort(new Comparison<T>(CompareBigThan<T>));
214 return list;
215 }
216
217 /// <summary>
218 /// 对两个特定类型的变量按照其中某个属性的大小进行排序
219 /// </summary>
220 /// <typeparam name="T">该变量的类型</typeparam>
221 /// <param name="objA">比较值一</param>
222 /// <param name="objB">比较值二</param>
223 /// <returns>结果</returns>
224 public int myCompare<T>(T objA, T objB)
225 {
226 if (objA == null || objB == null)
227 {
228 return 0; //任意一个比较值为null就返回0值。
229 }
230
231 System.Type t = objA.GetType();
232 System.Reflection.PropertyInfo p = t.GetProperty(SortExpression);
233
234 if (p != null)
235 {
236 object objA_Comparevalue = p.GetValue(objA, null);
237 object objB_Comparevalue = p.GetValue(objB, null);
238
239 //
240 //判断该属性的类型，并按该类型的比较方式进行比较
241 //
242 //
243
244 if (objA_Comparevalue.GetType() == typeof(DateTime))
245 {
246 return DateTime.Compare((DateTime)objA_Comparevalue, (DateTime)objB_Comparevalue);
247 }
248 if (objA_Comparevalue.GetType() == typeof(int))
249 {
250 return (int)objA_Comparevalue - (int)objB_Comparevalue;
251 }
252 if (objA_Comparevalue.GetType() == typeof(string))
253 {
254 return string.Compare(objA_Comparevalue.ToString(), objB_Comparevalue.ToString());
255 }
256 if (objA_Comparevalue.GetType() == typeof(long))
257 {
258 return (int)((long)objA_Comparevalue - (long)objB_Comparevalue);
259 }
260 if (objA_Comparevalue.GetType() == typeof(double))
261 {
262 return (int)((double)objA_Comparevalue - (double)objB_Comparevalue);
263 }
264
265
266 return 0;
267
268 }
269
270 return 0;
271 //
272 //比较值的类型中没有该属性，以及不在能进行比较范围内的类型返回值为0。
273 //
274 }
275
276 public int CompareBigThan<T>(T objA, T objB)
277 {
278 return myCompare<T>(objB, objA);
279 }
280
281 /// <summary>
282 /// 将数据源绑定到GridView
283 /// </summary>
284 /// <typeparam name="T">数据源对象的类型</typeparam>
285 /// <param name="gridViewToBind">GridView对象</param>
286 /// <param name="dataSource">绑定到GridView的数据源。当AutoFile为false时或Result结果集无值时使用该值。</param>
287 public void BindListToGridView<T>(System.Web.UI.WebControls.GridView gridViewToBind, List<T> dataSource)
288 {
289 gridViewToBind.PageIndexChanging += new GridViewPageEventHandler(this.BindListGridView1_PageIndexChanging);
290 gridViewToBind.Sorting += new GridViewSortEventHandler(this.BindListGridView1_Sorting<T>);
291
292
293 List<T> data = this.Result as List<T>;
294
295 if (AutoFill&&data!=null)
296 {
297 gridViewToBind.DataSource = (List<T>)this.Result;
298 }
299 else
300 {
301 gridViewToBind.DataSource=dataSource;
302 }
303 }
304
305 #endregion
306 }
