C# Usercontrol运行时宽度和高度
我试图在VS2008中创建一个简单的用户控件(不是WPF),它实际上是一个C# Usercontrol运行时宽度和高度,c#,visual-studio-2008,.net-3.5,user-controls,C#,Visual Studio 2008,.net 3.5,User Controls,我试图在VS2008中创建一个简单的用户控件(不是WPF),它实际上是一个SplitContainer,在Panel1中有一个按钮,按下该按钮时,切换Panel2Collapsed属性,并将控件的大小调整为Panel1 以下是控件的基本结构: private int _openHeight; private int _closedHeight; public MyUserControl(bool open) { InitializeComponent(); _openHeight =
SplitContainer
,在Panel1
中有一个按钮,按下该按钮时,切换Panel2Collapsed
属性,并将控件的大小调整为Panel1
以下是控件的基本结构:
private int _openHeight;
private int _closedHeight;
public MyUserControl(bool open)
{
InitializeComponent();
_openHeight = this.Height;
_closedHeight = splitContainer1.SplitterDistance;
Open = open;
}
private bool _open;
private bool Open
{
get { return _open; }
set
{
_open = value;
splitContainer1.Panel2Collapsed = !_open;
this.Height = _open ? _openHeight : _closedHeight;
}
}
private void button1_Click(object sender, EventArgs e)
{
Open = !Open;
}
问题在于运行时的this.Height
是控件在用户控件设计器中的值,而不是在设计时在主窗体设计器中设置的值
任何帮助都将不胜感激
更新
根据Lucas的解决方案,这种方法意味着只设置一次_openHeight,从而产生所需的效果:
private int? _openHeight;
private int _closedHeight;
public MyUserControl(bool open)
{
InitializeComponent();
//the _closedHeight doesn't change so can be defined in the constructor
_closedHeight = splitContainer1.SplitterDistance;
//set value
Open = open;
this.SizeChanged += new EventHandler(MyUserControl_SizeChanged);
this.Load += new EventHandler(MyUserControl_Load);
}
void MyUserControl_SizeChanged(object sender, EventArgs e)
{
//this event is called BEFORE the _Load event so gets the height set in the designer
// and not any changes at run time (e.g. when you collapse the control)
if (_openHeight == null)
_openHeight = this.Height;
}
private bool _open;
private bool Open
{
get { return _open; }
set
{
_open = value;
if (_open)
{
//sets height only if it has been initialized
if (_openHeight != null)
this.Height = (int)_openHeight;
}
else
{
this.Height = (int)_closedHeight;
}
}
}
void MyUserControl_Load(object sender, EventArgs e)
{
//now that control is loaded, set height
Open = Open;
}
private void button1_Click(object sender, EventArgs e)
{
Open = !Open;
}
您正在控件的构造函数中读取该控件的Height属性,这意味着它可能在窗体中显示之前。问题是,当控件需要在表单中显示时,大小似乎会被调整。在此之前,它是控件设计器中设置的一个值,您现在可以得到它 解决此问题的最简单方法是,当您确定控件已按表单绘制时,读取
高度
值,即您可以从控件的构造函数中获取打开
参数,添加一个新方法,用于初始化Open
和\u closedHeight
并在表单的Load
事件中调用它
大概是这样的:
public MyUserControl()
{
InitializeComponent();
}
public AdjustControlSize(bool open)
{
_openHeight = this.Height;
_closedHeight = splitContainer1.SplitterDistance;
Open = open;
}
//the rest of the control's code is unchanged
...
然后从表单的Load
事件调用AdjustControlSize
方法
具有事件机制的解决方案
您还可以在适当的时候使用控件自己的事件来读取高度。这样,您就不必更改表单
的代码中的任何内容
因此,在本例中,代码可以如下所示(尽管我还没有测试过):
这样,控件可以在每次更改大小时自行调整。我建议的解决方案对您有效吗?刚刚测试了您的第二个解决方案,稍加修改后,它就可以工作了。用我修改过的答案更新你的答案是否合适?只需在你的问题标题中进行na更新,并用你的答案和一些描述进行更新:)。我看到你编辑了我的答案,但如果你愿意,我可以放弃它,让你更新问题并根据我的答案描述你自己的版本:)。好的,拒绝,我将对问题进行更新。:-)
public MyUserControl(bool open)
{
InitializeComponent();
_openHeight = this.Height;
_closedHeight = splitContainer1.SplitterDistance;
Open = open;
this.SizeChanged += new EventHandler(MyUserControl_SizeChanged);
}
void CustomPictureBox_SizeChanged(object sender, EventArgs e)
{
_openHeight = this.Height;
_closedHeight = splitContainer1.SplitterDistance;
}