【发布时间】：2013-03-22 11:21:05
【问题描述】：
您好，我想在如下所示的网格视图中对多列进行排序 Hierarchical (Multi-column) Sorting for the .net GridView?
我做了我的家庭作业 我的 aspx 看起来像
<%@ Page Language="C#" AutoEventWireup="True" CodeBehind="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Multiple sorting with Gridview</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="True"
AllowSorting="true" onsorting="GridView1_Sorting" style="margin-right: 541px"
Width="873px">
</asp:GridView>
<p><asp:Label runat="server" ID="lblSortExpression" /></p>
</div>
</form>
</body>
</html>
在我的 Aspx.cs 页面中
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.Collections.Specialized;
using System.Text;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
partial class _Default : System.Web.UI.Page
{
private ListDictionary m_ldSortExpression;
private ListDictionary SortExpressions
{
get
{
m_ldSortExpression = (ListDictionary)ViewState["SortExpressions"];
if (m_ldSortExpression == null)
{
m_ldSortExpression = new ListDictionary();
}
return m_ldSortExpression;
}
set { ViewState["SortExpressions"] = value; }
}
protected void Page_Load(object sender, System.EventArgs e)
{
if (!IsPostBack)
{
BindData();
}
}
public void BindData()
{
// Usually you would get the data from the database.
// To simplify the code, I will just fill a datatable with some standard data.
DataTable dt = new DataTable();
dt.Columns.Add("FirstName");
dt.Columns.Add("LastName");
dt.Columns.Add("Age");
dt.Columns.Add("Position");
dt.Rows.Add(new object[] {
"1",
"2",
28,
"5"
});
dt.Rows.Add(new object[] {
"2",
"8",
31,
"2"
});
dt.Rows.Add(new object[] {
"2",
"4",
31,
"4"
});
dt.Rows.Add(new object[] {
"3",
"7",
37,
"3"
});
dt.Rows.Add(new object[] {
"4",
"4",
40,
"1"
});
DataView dv = dt.DefaultView;
// use a stringbuilder to hold the sortexpression for the dataview
StringBuilder sbSortExpression = new StringBuilder();
if (SortExpressions.Count > 0)
{
string[] myKeys = new string[SortExpressions.Count + 1];
SortExpressions.Keys.CopyTo(myKeys, 0);
for (int i = 0; i <= SortExpressions.Count - 1; i++)
{
sbSortExpression.Append(myKeys[i]);
sbSortExpression.Append(" ");
sbSortExpression.Append(SortExpressions[myKeys[i]]);
if (i != SortExpressions.Count - 1)
{
sbSortExpression.Append(", ");
}
}
lblSortExpression.Text = sbSortExpression.ToString();
// usually we would send that sort-expression now to SQL via some stored-procedure
dv.Sort = sbSortExpression.ToString();
}
else
{
lblSortExpression.Text = string.Empty;
}
GridView1.DataSource = dv;
GridView1.DataBind();
PositionGlyph(GridView1, dv.Sort.ToString(), dt);
}
private void PositionGlyph(GridView GridView1, string p,DataTable dt)
{
if ((GridView1.Rows.Count == 0) || (string.IsNullOrEmpty(p)))
return;
Image glyph = new Image();
glyph.EnableTheming = false;
string[] words = p.Split(',');
foreach (string word in words)
{
string[] SortType = word.Split(' ');
if (SortType[SortType.Length - 1] == SortOrder.Ascending.ToString().Substring(0, 3).ToUpper())
glyph.ImageUrl = "~/Images/down_arrow.png";
else
glyph.ImageUrl = "~/Images/up_arrow.png";
int columnindex = dt.Columns[SortType[SortType.Length - 2].ToString()].Ordinal;
GridView1.HeaderRow.Cells[columnindex].Controls.Add(glyph);
//for (int x = 0; x < dt.Columns.Count; x++)
//{
// if (SortType[SortType.Length - 2].ToString()== dt.Columns[x].ColumnName)
// {
// GridView1.HeaderRow.Cells[x].Controls.Add(glyph);
// break;
// }
//}
}
}
protected void GridView1_Sorting(object sender, System.Web.UI.WebControls.GridViewSortEventArgs e)
{
m_ldSortExpression = SortExpressions;
if (!m_ldSortExpression.Contains(e.SortExpression))
{
m_ldSortExpression.Add(e.SortExpression, e.SortDirection.ToString().Replace("Ascending", "ASC").Replace("Descending", "DESC"));
}
else
{
// Get sort direction
string strSortDirection = m_ldSortExpression[e.SortExpression].ToString();
// Was it ascending?
if (strSortDirection == "ASC")
{
// Yes, so sort in desc
m_ldSortExpression[e.SortExpression] = "DESC";
}
else if (strSortDirection == "DESC")
{
// it is descending
// remove the sort order
m_ldSortExpression.Remove(e.SortExpression);
}
}
SortExpressions = m_ldSortExpression;
BindData();
}
public _Default()
{
Load += Page_Load;
}
}
即使多次排序，一切正常，但列标题中的排序箭头未正确显示。我认为问题出在 PositionGlyph Method.Asc 或 Desc 箭头仅显示最后单击的标题。我想显示所有的排序方向列。请同样帮助我
【问题讨论】：
-
对于任何想在应用程序中使用此技术的人，我想指出 ListDictionary 类型对于此目的来说是一个糟糕的选择。它不保证键以任何特定顺序出现，并且按 FirstName 然后 LastName 排序与按 LastName 然后 FirstName 排序非常不同。 OrderedDictionary 会是更好的选择。
-
@Martin 您将使用什么作为 Ordered 字典中的键来使这项工作像 OP 想要的那样工作？当然不是列的名称或 SortExpression。
-
是的，您使用列名，正如 Rahul 所示。请注意，这与列标题文本不同——它确实需要是唯一的 ID。这段代码写得很好，你只需将每次出现的“ListDictionary”换成“OrderedDictionary”，以确保它保持正确的顺序。
标签： c# asp.net gridview datagrid grid