C#代码删除控件

Posted 2023-05-10

我用了两个button,点击就添加控件,另一个点击就删除所有刚刚添加的控件,可以添加,但却删不了,怎么办啊
代码为:
public int y = 0;
// 添加控件
private void button1_Click(object sender, EventArgs e)

ComboBox combo = new ComboBox() ;
combo.Name = "cbl" + y;
panel1.Controls.Add(combo);
y=y+1;

// 删除控件
private void button2_Click(object sender, EventArgs e)


??????

请帮忙看看
我知道用这个方法.
panel1.Controls.Remove(???);
但是因为里面的名字是我加尾数命名的,而且程序运行过程中,根本无法知道到底加了多少个组合框进去,
删除的时候,名字根本写不了,怎么办?我是这样写的

try

for (int i = 0; i < 100; i++)

panel1.Controls.Remove("cbl" + i);


finally

y = 0;

两个错误:
1,与"System.Windows.Forms.Contol.ControlCollection.Remove(System.Windows.Forms.Contol)"最匹配的重载方法具有一些无效参数.
2,参数"1":无法从"string"转换为"System.Windows.Forms.Contol"

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http://bbs.topsage.com/dispbbs.asp?boardID=121&ID=166512 参考技术A 把你的panel1.Controls.Remove("cbl" + i);
改成
string name = "cbl" + i.ToString();
panel1.Controls.RemoveByKey(name);

这样就可以了!本回答被提问者采纳 参考技术B 1.思路说明：遍历所有控件后，查询需要操作的，然后进行删除；
参考代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication2

public partial class Form1 : Form

public Form1()

InitializeComponent();


Queue<Control> query = new Queue<Control>();//临时存储获取到的control控件
/// <summary>
/// 递归获取panel1上的所有控件，并临时存储到一个队列中
/// </summary>
/// <param name="item"></param>
void DS(Control item)

for (int i = 0; i < item.Controls.Count;i++ )

if (item.Controls[i].HasChildren)

DS(item.Controls[i]);

else

query.Enqueue(item.Controls[i]);





private void button1_Click(object sender, EventArgs e)

DS(panel1);
//删除遍历到的控件
while (query.Count != 0)

query.Dequeue().Dispose();



参考技术C Remove()用这个方法

ComboBox combo = new ComboBox() ;
combo.Name = "cbl" + y;
panel1.Controls.Add(combo);
panel1.Controls.Remove(combo)

Remove这个方法参数是控件的实例，而不名字

比如，combo.Name = "cbl001";
Remove("cbl001")错
Remove(cbl001)对

WPF (C#) 用户控件删除元素

【中文标题】WPF (C#) 用户控件删除元素

【英文标题】：WPF (C#) Usercontrol remove elements

【发布时间】：2021-11-26 22:03:18

【问题描述】：

我正在使用 WPF(C#) 中的 Usercontrol 制作模板。

但是，在应用此用户控件时，是否可以减去特定部分？例如，移除一个按钮？

【问题讨论】：

隐藏多余的部分

我怎样才能让它隐藏，我怎样才能让它发生？

【参考方案1】：

要从 UserControl 中减去特定部分，可以使用可见性（折叠、隐藏）选项。 确保在 UserControl 中添加依赖属性以显示和隐藏特定部分。

【讨论】：

我不认为向用户控件添加依赖属性来控制可见性是一个好建议。 WPF 是围绕 MVVM 构建的，MVVM 解决方案是通过绑定到视图模型来控制可见性。

@NigelBess 我不同意你的观点，用户控件必须公开必要的功能才能与之交互，..

必要的功能已经通过绑定暴露了。无需通过为您想要控制的所有内容添加依赖属性来使事情复杂化。此外，您仍然需要访问依赖属性，无论哪种方式都应该通过绑定来完成

【参考方案2】：

听起来您只是想隐藏现有按钮，您应该通过将Visibility 设置为Visibility.Collapsed 或Visibility.Hidden 来做到这一点。这应该通过绑定到用户控件的 ViewModel 来完成。

如果您需要纯 XAML 解决方案：不，这样是不可能的。但是，反过来也是可能的：you can add content to a user control，它有效地提供了相同的功能。

您可以做的是制作一个不包含按钮的基本用户控件，而是有一个内容呈现器。第二个用户控件可以包装基本用户控件并将一个按钮定义为其内容。然后，当您不想将用户控件与按钮一起使用时，您可以简单地创建一个基本用户控件的实例。