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[英]How to get a reference to a label in a Repeater control in code-behind
[英]How to position a Label horizontally in Windows Forms code-behind
我有一个Windows窗体,我想从后台代码中进行操作。
我可以做这样的事情:
myForm.TheLableThatIWantToPosition.Text = "Some text!";
myForm.TheLableThatIWantToPosition.ForeColor = Color.Red;
etc.
但是,如何水平定位呢? 我想水平居中。
我尝试了:
myForm.TheLableThatIWantToPosition.TextAlign = ContentAlignment.MiddleCenter;
以及其他所有选项,但都不会发生。
如果要居中对齐标签中的内容-
AutoSize = false;
TextAlign = MiddleCenter;
您可以将此代码放置在label1.Parent
的SizeChanged
事件处理程序中:
if(label1.Parent != null){ //this if check may be removed if it's sure that Parent is not null
label1.Left = (label1.Parent.Width - label1.Width)/2;
}
最好您执行以下操作:
//SizeChanged event handler for your label1
private void label1_SizeChanged(object sender, EventArgs e){
label1.Left = (label1.Parent.Width - label1.Width)/2;
}
//SizeChanged event handler for your label1's Parent
private void parent_SizeChanged(object sender, EventArgs e){
label1.Left = (label1.Parent.Width - label1.Width)/2;
}
//you can change label1.Parent with a control reference which you know it's the container of your label1.
为了使它动态,例如,您有一个CustomLabel
类,并且您希望它在放置/添加到另一个容器时默认情况下居中:
public class CustomLabel : Label {
public CustomLabel(){
IsCentered = true;
}
private Control oldParent;
public bool IsCentered {get;set;}//You can define an Enum if needed
protected override void OnSizeChanged(EventArgs e){
if(Parent != null&&IsCentered){
Center();
}
}
protected override void OnParentChanged(EventArgs e){
if(Parent != null){
if(oldParent != null) oldParent.SizedChanged -= parent_SizeChanged;
Parent.SizedChanged -= parent_SizeChanged;
Parent.SizedChanged += parent_SizeChanged;
Center();
}
oldParent = Parent;
}
private void parent_SizeChanged(object sender, EventArgs e){
if(IsCentered) Center();
}
public void Center(){
Left = (Parent.Width - Width)/2;
}
}
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