【DropDownList】DropDownList根据下拉项的Text文本序号排序-下拉项-排序

欢迎您访问我爱IT技术网，今天小编为你分享的编程技术是：【DropDownList根据下拉项的Text文本序号排序】，下面是详细的讲解！

DropDownList根据下拉项的Text文本序号排序

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text.RegularExpressions;
public partial class Default2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ddlType.Items.Add(new ListItem("--请选择--"));
ddlType.Items.Add(new ListItem("2_bb"));
ddlType.Items.Add(new ListItem("1_aa"));
ddlType.Items.Add(new ListItem("4_ee"));
ddlType.Items.Add(new ListItem("3_dd"));
}
}
protected void btnSort_Click(object sender, EventArgs e)
{
DropDownListBubbleSort(ddlType);
//DropDownListSelectionSort(ddlType);
}
/// <summary>
/// 冒泡排序
/// </summary>
/// <param name="ddl"></param>
public void DropDownListBubbleSort(DropDownList ddl)
{
ListItem listItem=new ListItem();
for (int i=0; i < ddl.Items.Count; i++)
{
for (int j=i + 1; j < ddl.Items.Count; j++)
{
int firstVal=0, nextVal=0;
int.TryParse(Regex.Replace(ddl.Items[i].Text, @"\D", @"", RegexOptions.IgnoreCase), out firstVal);
int.TryParse(Regex.Replace(ddl.Items[j].Text, @"\D", @"", RegexOptions.IgnoreCase), out nextVal);
if (firstVal==0 || nextVal==0)
continue;
if (firstVal > nextVal)
{
listItem=ddl.Items[j];
ddl.Items.Remove(ddl.Items[j]);
ddl.Items.Insert(i, listItem);
}
}
}
}
/// <summary>
/// 选择排序
/// </summary>
/// <param name="ddl"></param>
public void DropDownListSelectionSort(DropDownList ddl)
{
ListItem listItem=new ListItem();
int length=ddl.Items.Count;
for (int i=0; i < length; i++)
{
int min=0;
int.TryParse(Regex.Replace(ddl.Items[i].Text, @"\D", @"", RegexOptions.IgnoreCase), out min);
if (min==0)
continue;
int minIndex=i;
for (int j=i + 1; j < length; j++)
{
int nextVal=0;
int.TryParse(Regex.Replace(ddl.Items[j].Text, @"\D", @"", RegexOptions.IgnoreCase), out nextVal);
if (nextVal==0)
continue;
if (min > nextVal)
{
min=nextVal;
minIndex=j;
}
}
if (minIndex !=i)
{
listItem=ddl.Items[minIndex];
ddl.Items.Remove(ddl.Items[minIndex]);
ddl.Items.Insert(i, listItem);
}
}
}
}

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