ASP.Net2.0 GridView 多列排序，显示排序图标，分页

ASP.Net2.0 GridView 多列排序，显示排序图标，分页。(转帖)

最近在使用ASP.net 2.0的GridView 控件时，发现排序与分页功能Microsoft实现的都很简单，比如排序，在点击列名的时候来触发整页的PostBack，然后排序，但是在列头上没有一个显示升序降序的图标，这会让最终用户使用时很迷惑，因为不知道是升序了还是降序了，所以今天首先解决的第一问题就是升序降序在列上显示图标，第二要解决的问题是默认GridView按列排序只能排一列的，也就是不能进行多列排序，而在实际应用中仅仅按照一列来排序是不能满足业务需求的，第三是GridView 分页问题，GridView预定义的分页页码显示，比较简单，而实际应用中，分页可能不是只显示首页，上一页，下一页，末页，或者是数字的页码那么简单，应该更需要，跳转，当前的页码，总页数等，更详尽的信息。

第一：GridView 多列排序与排序图标显示

首先我们可以新建一个类库程序，主要需要引用System.Web.Dll文件
然后新建一个类，这个类继承与GridView控件，我们只需要对部分方法进行重新即可。
我的演示的例子，采用了单列排序，如果启用多列排序，把控件的AllowMultiColumnSorting设置为True就是
多列排序。

public class WebGridView:GridView
2

{
3

#region 属性
4

/// <summary>
5

/// 是否启用或者禁止多列排序
6

/// </summary>
7

[
8

Description("是否启用多列排序功能"),
9

Category("排序"),
10

DefaultValue("false"),
11

]
12

public bool AllowMultiColumnSorting
13

{
14

get
15

{
16

object o = ViewState["EnableMultiColumnSorting"];
17

return (o != null ? (bool)o : false);
18

}
19

set
20

{
21

AllowSorting = true;
22

ViewState["EnableMultiColumnSorting"] = value;
23

}
24

}
25

/// <summary>
26

/// 升序时显示图标
27

/// </summary>
28

[
29

Description("升序时显示图标"),
30

Category("排序"),
31

Editor("System.Web.UI.Design.UrlEditor", typeof(System.Drawing.Design.UITypeEditor)),
32

DefaultValue(""),
33

]
35

public string SortAscImageUrl
36

{
37

get
38

{
39

object o = ViewState["SortImageAsc"];
40

return (o != null ? o.ToString() : "");
41

}
42

set
43

{
44

ViewState["SortImageAsc"] = value;
45

}
46

}
47

/// <summary>
48

/// 降序时显示图标
49

/// </summary>
50

[
51

Description("降序时显示图标"),
52

Category("排序"),
53

Editor("System.Web.UI.Design.UrlEditor", typeof(System.Drawing.Design.UITypeEditor)),
54

DefaultValue(""),
55

]
56

public string SortDescImageUrl
57

{
58

get
59

{
60

object o = ViewState["SortImageDesc"];
61

return (o != null ? o.ToString() : "");
62

}
63

set
64

{
65

ViewState["SortImageDesc"] = value;
66

}
67

}
68

#endregion
69

#region 重写方法
70

protected override void OnSorting(GridViewSortEventArgs e)
71

{
72

if (AllowMultiColumnSorting)
73

{
74

e.SortExpression = GetSortExpression(e);
75

}
76

base.OnSorting(e);
78

}
79

protected override void OnRowCreated(GridViewRowEventArgs e)
80

{
81

if (e.Row.RowType == DataControlRowType.Header)
82

{
83

if (SortExpression != String.Empty)
84

{
85

DisplaySortOrderImages(SortExpression, e.Row);
86

this.CreateRow(0, 0, DataControlRowType.EmptyDataRow, DataControlRowState.Normal);
87

}
88

}
89

base.OnRowCreated(e);
90

}
91

#endregion
92

#region 受保护的方法
93

/// <summary>
94

/// 获取排序表达式
95

/// </summary>
96

protected string GetSortExpression(GridViewSortEventArgs e)
97

{
98

string[] sortColumns = null;
99

string sortAttribute = SortExpression;
100

101

if (sortAttribute != String.Empty)
102

{
103

sortColumns = sortAttribute.Split(",".ToCharArray());
104

}
105

if (sortAttribute.IndexOf(e.SortExpression) > 0 || sortAttribute.StartsWith(e.SortExpression))
106

{
107

sortAttribute = ModifySortExpression(sortColumns, e.SortExpression);
108

}
109

else
110

{
111

sortAttribute += String.Concat(",", e.SortExpression, " ASC ");
112

}
113

return sortAttribute.TrimStart(",".ToCharArray()).TrimEnd(",".ToCharArray());
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

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)

{

linkBtnFirst.Enabled = false;

linkBtnPrev.Enabled = false;

}

else if (CustomersGridView.PageIndex == CustomersGridView.PageCount-1)

{

linkBtnLast.Enabled = false;

linkBtnNext.Enabled = false;

}

else if (CustomersGridView.PageCount<=0)

{

linkBtnFirst.Enabled = false;

linkBtnPrev.Enabled = false;

linkBtnNext.Enabled = false;

linkBtnLast.Enabled = false;

}

DropDownList pageList = (DropDownList)pagerRow.Cells[0].FindControl("PageDropDownList");

Label pageLabel = (Label)pagerRow.Cells[0].FindControl("CurrentPageLabel");

if (pageList != null)

{

for (int i = 0; i < CustomersGridView.PageCount; i++)

{

int pageNumber = i + 1;

ListItem item = new ListItem(pageNumber.ToString() + "/" + CustomersGridView.PageCount.ToString(), pageNumber.ToString());

if (i == CustomersGridView.PageIndex)

{

item.Selected = true;

}

pageList.Items.Add(item);

}

if (pageLabel != null)

{

int currentPage = CustomersGridView.PageIndex + 1;

pageLabel.Text = "当前页： " + currentPage.ToString() +

" / " + CustomersGridView.PageCount.ToString();

}

</script>

<html>

<body>

<h3>

GridView PagerTemplate Example</h3>

<asp:WebGridView ID="CustomersGridView" DataSourceID="CustomersSqlDataSource" AutoGenerateColumns="true"

AllowPaging="true" OnDataBound="CustomersGridView_DataBound" SortAscImageUrl="~\images\arrow-up.gif" SortDescImageUrl="~\images\arrow-down.gif" runat="server" AllowSorting="True" Width="723px">

<tr>

<asp:Label ID="MessageLabel" ForeColor="Blue" Text="页码:" runat="server" />

<asp:DropDownList ID="PageDropDownList" AutoPostBack="true" OnSelectedIndexChanged="PageDropDownList_SelectedIndexChanged"

runat="server" />

<asp:LinkButton CommandName="Page" CommandArgument="First" ID="linkBtnFirst" runat="server">首页</asp:LinkButton>

<asp:LinkButton CommandName="Page" CommandArgument="Prev" ID="linkBtnPrev" runat="server">上一页</asp:LinkButton>

<asp:LinkButton CommandName="Page" CommandArgument="Next" ID="linkBtnNext" runat="server">下一页</asp:LinkButton>

<asp:LinkButton CommandName="Page" CommandArgument="Last" ID="linkBtnLast" runat="server">末页</asp:LinkButton>

</td>

<asp:Label ID="CurrentPageLabel" ForeColor="Blue" runat="server" />

</td>

</tr>

</table>

</PagerTemplate>

</asp:WebGridView>

<asp:SqlDataSource ID="CustomersSqlDataSource" SelectCommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"

ConnectionString="<%$ ConnectionStrings:NorthWindConnectionString%>" runat="server">

</asp:SqlDataSource>

</form>

</body>

</html>

效果：

posted on 2007-01-23 15:44 冷火阅读(1302) 评论(1) 收藏举报