如何更改列表框选中的项目forecolor / backcolor按钮单击C＃[复制] [英] How to change listbox selected item forecolor/backcolor on button click in C# [duplicate]

问题描述

大家好！我在我的C＃项目中遇到了一个问题，问题是如何更改列表框选中的项目forecolor / backcolor按钮点击c＃

请帮我解决这个问题

谢谢



我尝试了什么：



i也尝试过drawitem活动，fontdialog，颜色对话框

解决方案

参考 - c＃ - 如何以编程方式更改列表框中所选项目的背景颜色？ - 堆栈溢出 [ ^ ]

试试这个

 私有  void  Form1_Load（ object  sender，EventArgs e）
 {
 listBox1.DrawMode = DrawMode.OwnerDrawFixed; 
 listBox1.SelectionMode = SelectionMode.MultiExtended; 
 listBox1.DrawItem + =  new  DrawItemEventHandler（listBox_DrawItem）; 
 listBox1.Items.AddRange（ new   object  [] { ，  B，  C，   D}）; 
} 
 List< int> lstSelectedIndex =  new  List< int>（）; 
  void  listBox_DrawItem（ object  sender，DrawItemEventArgs e）
 {
  if （e.Index >  -1）
 {
 e.DrawBackground （）; 
  if （lstSelectedIndex.Any（k = >  k == e.Index）） 
 e.Graphics.FillRectangle（Brushes.Green，e.Bounds）; 
 
 使用（画笔textBrush = 新 SolidBrush（e.ForeColor））
 {
 e.Graphics.DrawString（listBox1.Items [e.Index] .ToString（），e.​​Font，textBrush，e.Bounds.Location）; 
} 
} 
} 
 
  private   void  button1_Click（ object  sender，EventArgs e）
 {
 lstSelectedIndex.Clear（）; 
 lstSelectedIndex.AddRange（listBox1.SelectedIndices.OfType< int>（））; 
 listBox1.Refresh（）; 
} 
 

这是我使用jQuery与RegisterClientScriptBlock实现相同的

 <   html     xmlns   =  http：/ /www.w3.org/1999/xhtml\">  
 <   head     runat   =  server >  
 <   title  >  <   / title  >  
 <   script     src   =  Scripts / jquery-1.10.2。 js >  <   /   script  >  
 <   / head  >  
  <   body  >  
 <  表格    id   =  form1    runat   =  server >  
 <   div  >  
 <   asp：listbox     id   =  lstBox    runat   =  server    clientidmode   = 静态    xmlns：asp   =  #unknown >  
 <   asp：listitem     text   =   test1    value   =  1   已选择  =  True >  <   / asp：listitem  >  
 <   asp：listitem     text   =  test2    value   =  2 >  < span class =code-keyword><   / asp：listitem  >  
 <   asp：listitem     text   =  test3    value   =  3 >  <   / asp：listitem  >  
 <   asp：listitem     text   =  test4   值  =  4 > ;  <   / asp：listitem  > ;  
 <   / asp：listbox  >  
 <   / div  >  
 <   asp：button     id   =   btnText    runat  < span class =code-keyword> =  server    text   = 按钮    onclick   =  btnText_Click    xmlns：asp   = ＃unknown    /  >  
 <   / form  >  
 <   / body  >  
 <   / html  >  

按钮的服务器端单击事件处理程序如下： -

  protected   void  btnText_Click（ object  sender，EventArgs e）
 {
 < span class =code-sdkkeyword> String  scriptName =   ButtonClickJSScript; 
类型pageType = 此 .GetType（）; 
 
 ClientScriptManager cs = Page.ClientScript; 
 
  if （！cs.IsClientScriptBlockRegistered（pageType，scriptName））
 {
 StringBuilder scriptText =  new  StringBuilder（）; 
 scriptText.Append（ < script type = \   text / javascript \ >  

Hello Guys! i am facing a issue in my C# project and that issue is How to change listbox selected item forecolor/backcolor on button click in c#
Please help me sort out this issue
Thanks

What I have tried:

i have also tried drawitem event,fontdialog ,color dialog

解决方案

Refer - c# - how to change background color of selected item in a listbox programmatically? - Stack Overflow[^]

try this

private void Form1_Load(object sender, EventArgs e)
       {
           listBox1.DrawMode = DrawMode.OwnerDrawFixed;
           listBox1.SelectionMode = SelectionMode.MultiExtended;
           listBox1.DrawItem += new DrawItemEventHandler(listBox_DrawItem);
           listBox1.Items.AddRange(new object[] { "A", "B", "C", "D" });
       }
       List<int> lstSelectedIndex = new List<int>();
       void listBox_DrawItem(object sender, DrawItemEventArgs e)
       {
           if (e.Index > -1)
           {
               e.DrawBackground();
               if (lstSelectedIndex.Any(k => k == e.Index))
                   e.Graphics.FillRectangle(Brushes.Green, e.Bounds);

               using (Brush textBrush = new SolidBrush(e.ForeColor))
               {
                   e.Graphics.DrawString(listBox1.Items[e.Index].ToString(), e.Font, textBrush, e.Bounds.Location);
               }
           }
       }

       private void button1_Click(object sender, EventArgs e)
       {
           lstSelectedIndex.Clear();
           lstSelectedIndex.AddRange(listBox1.SelectedIndices.OfType<int>());
           listBox1.Refresh();
       }

Here is mine implemented the same using jQuery with RegisterClientScriptBlock

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="Scripts/jquery-1.10.2.js"></script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:listbox id="lstBox" runat="server" clientidmode="Static" xmlns:asp="#unknown">
            <asp:listitem text="test1" value="1" selected="True"></asp:listitem>
            <asp:listitem text="test2" value="2"></asp:listitem>
            <asp:listitem text="test3" value="3"></asp:listitem>
            <asp:listitem text="test4" value="4"></asp:listitem>
        </asp:listbox>
    </div>
        <asp:button id="btnText" runat="server" text="Button" onclick="btnText_Click" xmlns:asp="#unknown" />
    </form>
</body>
</html>

And on the server side click event handler for the button is as below:-

protected void btnText_Click(object sender, EventArgs e)
        {
            String scriptName = "ButtonClickJSScript";
            Type pageType = this.GetType();

            ClientScriptManager cs = Page.ClientScript;

            if (!cs.IsClientScriptBlockRegistered(pageType, scriptName))
            {
                StringBuilder scriptText = new StringBuilder();
                scriptText.Append("<script type="\"text/javascript\"">

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