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c# - Gridview 中的多列排序?

转载 作者:太空宇宙 更新时间:2023-11-03 13:44:48 25 4
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您好,我想在 gridview 中对多列进行排序,如下所示 Hierarchical (Multi-column) Sorting for the .net GridView?

我做了功课我的 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;
}

}

一切正常,即使是多重排序,但列标题中的排序箭头未正确显示。我认为问题出在 PositionGlyph 方法中。Asc 或 Desc 箭头仅针对最后单击的标题显示。我想显示所有的排序方向columns.Please 帮助我

最佳答案

使用这个:

DataView m_DataView = new DataView(dt);
m_DataView.Sort =ColumnName1 + " ASC, " + ColumnName2 + " ASC, " + ColumnName3 + " ASC";

希望这对您有所帮助。

关于c# - Gridview 中的多列排序?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15742521/

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