单击按钮时，动态创建的控件消失 [英] Dynamically created controls disappears when I click button

问题描述

我有一个表单，通过另一个类，我调用一个方法，以编程方式创建表面板布局，并将其放在表单上。

I have a form and through another class I call a method that programmatically creates a Table Panel Layout, and putting it on the form.

所以我有这个：

Form1.cs

var myNewClass = new MyClass(this);
myNewClass.createDynamicTableLayoutPanel()

private void btnChangeColor_Click(object sender, EventArgs e)
{
   var myNewClass = new MyClass(this);
   myNewClass.changeColor();
}

MyClass.cs

MyClass.cs

//Method 1 that creates Table Layout Panel with some controls in it
public void createDynamicTableLayoutPanel()

//Method 2 will change the color of controls in Table Layout Panel 
public void changeColor()

Button btnChangeColor = new Button();
btnChangeColor.Text = "Change color";

btnChangeColor.Click += (s, e) => {changeColor();}

frm1.TableLayoutPanel1.Controls.Add(btnChangeColor, 0, 2);

推荐答案

您正在创建一个全新的MyClass实例，它没有面板。您需要使用现有实例。

You are creating an entirely new instance of MyClass, which doesn't have the panel. You need to use the existing instance.

// You need to keep using this instance, not create a new one.
var myNewClass = new MyClass(this);
myNewClass.createDynamicTableLayoutPanel()

private void btnChangeColor_Click(object sender, EventArgs e)
{
   //var myNewClass = new MyClass(this); // So remove this line.
   myNewClass.changeColor();
}

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