[英]How to add a control to a panel on a form from another user control
I have a form1.cs and in that form I have a panel1, in the load event of the form1.cs I am adding a control to the panel1. 我有一个form1.cs,在那种形式我有一个panel1,在form1.cs的load事件中我向panel1添加一个控件。 Now my issue is, I have a control called Numbers.cs, I need to add another control to that panel1 but from this control in a button event.
现在我的问题是,我有一个名为Numbers.cs的控件,我需要向该panel1添加另一个控件,但是在按钮事件中从该控件添加。 How can I do this?
我怎样才能做到这一点?
public partial class Number : UserControl
{
public Number()
{
InitializeComponent();
}
private void btnAcceptWelcome_Click(object sender, EventArgs e)
{
//HERE I NEED TO PASS A CONTROL TO THE PANEL1 IN FORM1.CS
//NOT SURE HOW TO DO THIS.
}
}
MORE INFO 更多信息
So basically I have a folder called UserControls and in that folder I have 所以基本上我有一个名为UserControls的文件夹,我在那个文件夹中
Numbers.cs
Letters.cs
Welcome.cs
All of them user controls, then i have a form 所有这些用户控件,然后我有一个表单
Form1.cs
Form1.cs instantiates Welcome and it is added to a Panel1 on the Form1.cs on form load. Form1.cs实例化欢迎,并在表单加载时将其添加到Form1.cs上的Panel1中。 Then Welcome.cs has a button, when I click this button I need to swap to Numbers.cs.
然后Welcome.cs有一个按钮,当我单击此按钮时,我需要交换到Numbers.cs。 But I dont know how to do this from Welcome.cs
但我不知道如何从Welcome.cs做到这一点
Another way would be to use a Custom Event raised by Numbers and handled by Form1 to pass the control and add it to your Panel's Control Collection. 另一种方法是使用Numbers引发的自定义事件并由Form1处理以传递控件并将其添加到Panel的Control Collection中。
This is an example of an Custom Event added to UserControl1 这是添加到UserControl1的自定义事件的示例
Form1 Form1中
public partial class Form1 : Form
{
UserControl2 mySecondControl = new UserControl2();
public Form1()
{
InitializeComponent();
userControl11.AddControl+=new EventHandler(SwapControls);
}
private void SwapControls(object sender, EventArgs e)
{
panel1.Controls.Remove(userControl11);
userControl11.AddControl -= new EventHandler(SwapControls);
panel1.Controls.Add(mySecondControl);
}
}
UserControl 用户控件
public partial class UserControl1 : UserControl
{
public event EventHandler AddControl;
public UserControl1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
this.AddControl(this, new EventArgs());
}
}
Note: 注意:
Number
Number
的引用 Add an event handler to Number
: 向
Number
添加事件处理程序:
public partial class Number : UserControl
{
// event handler Form1 will subscribe to
public EventHandler<EventArgs> OnWelcomeAccepted = (o, e) => { };
public Number()
{
InitializeComponent();
}
private void btnAcceptWelcome_Click(object sender, EventArgs e)
{
// raise the event
OnWelcomeAccepted(sender, e);
}
}
...Form1 will have a subscription after InitializeComponent()
; ... Form1将在
InitializeComponent()
之后订阅; note the additional subscription to ControlAdded
: 请注意
ControlAdded
的附加订阅:
public partial class Form1 : Form {
public Form1()
{
InitializeComponent();
this.ControlAdded += Control_Added;
// subscribe to the event and provide the implementation
Number.OnWelcomAccepted += (o, e) => { Controls.Add(GetControl( )); }
}
private void Control_Added(object sender, System.Windows.Forms.ControlEventArgs e)
{
// process size and placement and show
}
}
No other control should be adding anything directly to Form1
. 没有其他控件应该直接向
Form1
添加任何内容。 Let Form1 control it's children. 让Form1控制它的孩子。
一种方法是在数字中引用panel1,因为它们都是在form1中创建的,你可以将一个作为参数传递给另一个构造函数。
It's not very clear from your description but you can just pass the control you want in the constructor or a property. 从您的描述中不是很清楚,但您可以在构造函数或属性中传递您想要的控件。 Since in C# objects are always by reference you will be action on the same control in the Button event.
由于在C#对象中总是通过引用,因此您将对Button事件中的同一控件执行操作。 You can always write your own event and have the panel register for it.
您始终可以编写自己的事件并让面板注册。 A more complete code sample would be great.
更完整的代码示例会很棒。
I'm still a little unsure of what you're doing exactly but that's OK. 我仍然不确定你在做什么,但那没关系。 I think the most flexible approach is to create your own custom event.
我认为最灵活的方法是创建自己的自定义事件。 Outside of any class create a delegate:
在任何类之外创建一个委托:
public delegate void WelcomeClick(object sender, EventArgs e);
Inside Welcome you need to create the event handler, it can be either static or part of the instance: 在Welcome中你需要创建事件处理程序,它可以是静态的,也可以是实例的一部分:
public event WelcomeClick OnClick;
Inside the Button Click event in welcome you can just call that event with the same parameters: 在Welcome中的Button Click事件中,您可以使用相同的参数调用该事件:
if (OnClick != null)
OnClick(sender, e);
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.