在 C# 中将所选项目从一个列表框移动到另一个列表框
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【中文标题】在 C# 中将所选项目从一个列表框移动到另一个列表框【英文标题】：Move selected items from one listbox to another in C# 【发布时间】：2020-07-29 08:23:51 【问题描述】：此代码在 Savepnusers 成功完成后追加新项目时重新初始化 ListBox1。
在 TextBox 中写入值，此值将附加到 ListBox1。
但我无法从 ListBox1 到 ListBox2 获取所有值或单个值，因为附加的新项从 ListBox1 中消失了。
请看这个：
下面是我的完整代码。
有什么建议吗？
.cs 页面
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Data.Odbc;
using System.Threading;
using System.Web.Script.Services;
using System.Web.Services;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Default : System.Web.UI.Page
string sql;
ArrayList arraylist1 = new ArrayList();
ArrayList arraylist2 = new ArrayList();
protected void btn4_Click(object sender, EventArgs e)
while (ListBox2.Items.Count != 0)
for (int i = 0; i < ListBox2.Items.Count; i++)
ListBox1.Items.Add(ListBox2.Items[i]);
ListBox2.Items.Remove(ListBox2.Items[i]);
protected void btn3_Click(object sender, EventArgs e)
arraylist2 = new ArrayList();
if (ListBox2.SelectedIndex >= 0)
for (int i = 0; i < ListBox2.Items.Count; i++)
if (ListBox2.Items[i].Selected)
if (!arraylist2.Contains(ListBox2.Items[i]))
arraylist2.Add(ListBox2.Items[i]);
for (int i = 0; i < arraylist2.Count; i++)
if (!ListBox1.Items.Contains(((ListItem)arraylist2[i])))
ListBox1.Items.Add(((ListItem)arraylist2[i]));
ListBox2.Items.Remove(((ListItem)arraylist2[i]));
ListBox1.SelectedIndex = -1;
protected void btn2_Click(object sender, EventArgs e)
while (ListBox1.Items.Count != 0)
for (int i = 0; i < ListBox1.Items.Count; i++)
ListBox2.Items.Add(ListBox1.Items[i]);
ListBox1.Items.Remove(ListBox1.Items[i]);
protected void btn1_Click(object sender, EventArgs e)
arraylist1 = new ArrayList();
if (ListBox1.SelectedIndex >= 0)
for (int i = 0; i < ListBox1.Items.Count; i++)
if (ListBox1.Items[i].Selected)
if (!arraylist1.Contains(ListBox1.Items[i]))
arraylist1.Add(ListBox1.Items[i]);
for (int i = 0; i < arraylist1.Count; i++)
if (!ListBox2.Items.Contains(((ListItem)arraylist1[i])))
ListBox2.Items.Add(((ListItem)arraylist1[i]));
ListBox1.Items.Remove(((ListItem)arraylist1[i]));
ListBox2.SelectedIndex = -1;
private void MTListBox1()
DataTable dt = new DataTable();
sql = @String.Format(" SELECT NAME FROM `country` GROUP BY `NAME` ORDER BY SURFACEAREA DESC LIMIT 10; ");
using (OdbcConnection cn =
new OdbcConnection(ConfigurationManager.ConnectionStrings["cn"].ConnectionString))
using (OdbcCommand command =
new OdbcCommand(sql, cn))
try
command.Connection.Open();
OdbcDataAdapter sqlDa = new OdbcDataAdapter(command);
sqlDa.Fill(dt);
if (dt.Rows.Count > 0)
ListBox1.DataTextField = "NAME";
ListBox1.DataValueField = "NAME";
ListBox1.DataSource = dt;
ListBox1.DataBind();
catch (OdbcException ex)
string msg = "Fetch Error:";
msg += ex.Message;
throw new Exception(msg);
finally
command.Connection.Close();
public class pnnusers
public string txuser get; set;
[WebMethod(EnableSession = true)]
[ScriptMethod]
public static void Savepnusers(pnnusers nnewuser)
string sql = @String.Format("INSERT INTO `stored` SELECT Name, NULL FROM Country WHERE Name=?;");
using (OdbcConnection cn =
new OdbcConnection(ConfigurationManager.ConnectionStrings["cn"].ConnectionString))
using (OdbcCommand command =
new OdbcCommand(sql, cn))
try
command.Connection.Open();
command.Parameters.AddWithValue("param1", nnewuser.txuser.ToString());
command.ExecuteNonQuery();
catch (Exception ex)
throw ex;
finally
command.Connection.Close();
protected void Page_Load(object sender, EventArgs e)
if (!Page.IsPostBack)
MTListBox1();
.aspx 页面
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Default"
EnableEventValidation="false" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" src="http://cdn.jsdelivr.net/json2/0.1/json2.js"></script>
<script type="text/javascript">
$(function ()
$("[id*=imgsave]").bind("click", function ()
var qString = "?" + window.location.href.split("?")[1];
var nnewuser = ;
nnewuser.txuser = $("[id*=txuser]").val();
var txtUser = $("[id*=txuser]").val();
$.ajax(
type: "POST",
url: "Default.aspx/Savepnusers" + qString,
data: 'nnewuser: ' + JSON.stringify(nnewuser) + '',
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (response)
if ($("[id*=txuser]").val())
alert("OK");
alert(JSON.stringify(nnewuser));
if (txtUser)
$("[id*=ListBox1]").append("<option value='" + nnewuser.txuser + "'>" + nnewuser.txuser + "</option>");
,
failure: function (response)
alert(response.d);
,
error: function (response)
alert(response.d);
,
error: function (xhr, ajaxOptions, thrownError)
alert("error : " + thrownError + JSON.stringify(nnewuser));
);
return false;
);
);
</script>
</head>
<body>
<form id="form1" runat="server">
<div style="align-content: center;">
<br />
<asp:TextBox ID="txuser" runat="server" BackColor="Yellow" CssClass="pure-u-23-24"></asp:TextBox>
<br />
<asp:ImageButton ID="imgsave" runat="server"
ImageUrl="/ImgFolder/Img.gif"
OnClientClick="if (!confirm('Are you sure?')) return false;" />
<br />
LISTBOX1
<br />
<div>
<asp:ListBox ID="ListBox1" runat="server"
SelectionMode="Multiple"
Height="250" Width="400"></asp:ListBox>
LISTBOX2
<asp:ListBox ID="ListBox2" runat="server"
SelectionMode="Multiple"
Height="250" Width="400"></asp:ListBox>
</div>
<br />
<div style="align-content: center;">
<asp:Button ID="btn1" runat="server" Text=">" OnClick="btn1_Click" Width="100" />
<br />
<asp:Button ID="btn2" runat="server" Text=">>" OnClick="btn2_Click" Width="100" />
<br />
<asp:Button ID="btn3" runat="server" Text="<" OnClick="btn3_Click" Width="100" />
<br />
<asp:Button ID="btn4" runat="server" Text="<<" OnClick="btn4_Click" Width="100" />
</div>
</div>
</form>
</body>
</html>
【问题讨论】：
【参考方案1】：根据您的描述和代码，据我所知，问题是当您单击按钮时，页面将刷新并且列表框无法获取当前数据。 我建议您可以使用按钮单击将数据插入数据库而不是 ajax。
更多细节，您可以参考以下代码：
<form id="form1" runat="server">
<div style="align-content: center;">
<br />
<asp:TextBox ID="txuser" runat="server" BackColor="Yellow" CssClass="pure-u-23-24"></asp:TextBox>
<br />
<asp:Button ID="imgsave" runat="server"
OnClientClick="return confirm('Are you sure?');" OnClick="imgsave_Click" />
<br />
LISTBOX1
<br />
<div>
<asp:ListBox ID="ListBox1" runat="server"
SelectionMode="Multiple"
Height="250" Width="400"></asp:ListBox>
LISTBOX2
<asp:ListBox ID="ListBox2" runat="server"
SelectionMode="Multiple"
Height="250" Width="400"></asp:ListBox>
</div>
<br />
<div style="align-content: center;">
<asp:Button ID="btn1" runat="server" Text=">" OnClick="btn1_Click" Width="100" />
<br />
<asp:Button ID="btn2" runat="server" Text=">>" OnClick="btn2_Click" Width="100" />
<br />
<asp:Button ID="btn3" runat="server" Text="<" OnClick="btn3_Click" Width="100" />
<br />
<asp:Button ID="btn4" runat="server" Text="<<" OnClick="btn4_Click" Width="100" />
</div>
</div>
</form>
代码隐藏：
string sql;
ArrayList arraylist1 = new ArrayList();
ArrayList arraylist2 = new ArrayList();
protected void Page_Load(object sender, EventArgs e)
if (!IsPostBack)
MTListBox1();
protected void btn1_Click(object sender, EventArgs e)
arraylist1 = new ArrayList();
if (ListBox1.SelectedIndex >= 0)
for (int i = 0; i < ListBox1.Items.Count; i++)
if (ListBox1.Items[i].Selected)
if (!arraylist1.Contains(ListBox1.Items[i]))
arraylist1.Add(ListBox1.Items[i]);
for (int i = 0; i < arraylist1.Count; i++)
if (!ListBox2.Items.Contains(((ListItem)arraylist1[i])))
ListBox2.Items.Add(((ListItem)arraylist1[i]));
ListBox1.Items.Remove(((ListItem)arraylist1[i]));
ListBox2.SelectedIndex = -1;
protected void btn2_Click(object sender, EventArgs e)
while (ListBox1.Items.Count != 0)
for (int i = 0; i < ListBox1.Items.Count; i++)
ListBox2.Items.Add(ListBox1.Items[i]);
ListBox1.Items.Remove(ListBox1.Items[i]);
protected void btn3_Click(object sender, EventArgs e)
arraylist2 = new ArrayList();
if (ListBox2.SelectedIndex >= 0)
for (int i = 0; i < ListBox2.Items.Count; i++)
if (ListBox2.Items[i].Selected)
if (!arraylist2.Contains(ListBox2.Items[i]))
arraylist2.Add(ListBox2.Items[i]);
for (int i = 0; i < arraylist2.Count; i++)
if (!ListBox1.Items.Contains(((ListItem)arraylist2[i])))
ListBox1.Items.Add(((ListItem)arraylist2[i]));
ListBox2.Items.Remove(((ListItem)arraylist2[i]));
ListBox1.SelectedIndex = -1;
protected void btn4_Click(object sender, EventArgs e)
while (ListBox2.Items.Count != 0)
for (int i = 0; i < ListBox2.Items.Count; i++)
ListBox1.Items.Add(ListBox2.Items[i]);
ListBox2.Items.Remove(ListBox2.Items[i]);
protected void MTListBox1()
string str, strSql;
str = System.Configuration.ConfigurationManager.ConnectionStrings["aspnet-TestApplicationWithDatabase-20190820030542"].ConnectionString;
SqlConnection conn = new SqlConnection(str);
strSql = "select Name from stored";
SqlCommand cmd = new SqlCommand(strSql, conn);
try
conn.Open();
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
if (dt.Rows.Count > 0)
ListBox1.DataTextField = "NAME";
ListBox1.DataValueField = "NAME";
ListBox1.DataSource = dt;
ListBox1.DataBind();
catch (Exception ex)
string msg = "Fetch Error:";
msg += ex.Message;
throw new Exception(msg);
finally
conn.Close();
public class pnnusers
public string txuser get; set;
protected void imgsave_Click(object sender, EventArgs e)
string sql = "INSERT INTO stored(Name) values(@param1)";
string str;
str = System.Configuration.ConfigurationManager.ConnectionStrings["aspnet-TestApplicationWithDatabase-20190820030542"].ConnectionString;
SqlConnection conn = new SqlConnection(str);
SqlCommand cmd = new SqlCommand(sql, conn);
try
conn.Open();
cmd.Parameters.AddWithValue("param1", txuser.Text);
cmd.ExecuteNonQuery();
catch (Exception ex)
throw ex;
finally
conn.Close();
MTListBox1();
结果：
【讨论】：
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