[英]c# visual studio custom control binding issue
我想創建一個簡單的自定義控件(實際上是一種按鈕)。 我已經創建了控件,但是缺少的步驟是如何添加綁定。 我擁有的控制代碼如下所示:
public partial class PopUpButton : UserControl
{
public PopUpButton()
{
InitializeComponent();
_checked = false;
DrawButton();
}
public delegate void ChangedEventHandler(object sender, EventArgs e);
public event ChangedEventHandler OnValueChanged;
private bool _checked;
private String _text;
private void UserControl1_Resize(object sender, EventArgs e)
{
DrawButton();
}
[Bindable(true)]
public bool Checked
{
get
{
return _checked;
}
set
{
_checked = value;
DrawButton();
if (OnValueChanged != null)
{
OnValueChanged.Invoke(this, new EventArgs());
}
}
}
[Bindable(true)]
public String DisplayText
{
get
{
return _text;
}
set
{
_text = value;
DrawButton();
}
}
private void DrawButton()
{
// do some stuff
}
private void PopUpButton_Click(object sender, EventArgs e)
{
_checked = !_checked;
DrawButton();
if (OnValueChanged != null)
{
OnValueChanged.Invoke(this, new EventArgs());
}
}
}
綁定到控件的調用如下所示:
regControl1.DataBindings.Clear();
regControl1.DataBindings.Add("Checked", CustomButton1, "Checked");
我知道我需要定義一個數據源和成員,但是看不到如何實現它。 當調用上述綁定時,regControl1將使用“ Checked”的值進行更新,但是函數“ OnValueChanged”始終為null,因此綁定失敗,因此,當“ Checked”更改時,“ regControl1”不會更新。
有任何想法嗎?
終於有了工作。 該解決方案可以處理主體和標簽上的咔嗒聲,並在設計期間調整組件的大小。 我快到了,但希望對您有所幫助:
public partial class PopUpButton : UserControl, INotifyPropertyChanged
{
public PopUpButton()
{
InitializeComponent();
_checked = false;
DrawButton();
}
private bool _checked;
private String _text;
public event PropertyChangedEventHandler PropertyChanged;
public event EventHandler ButtonClick;
private void NotifyPropertyChanged(String info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}
protected void Button_Click(object sender, EventArgs e)
{
_checked = !_checked;
DrawButton();
NotifyPropertyChanged("Checked");
if (this.ButtonClick != null)
this.ButtonClick(this, e);
}
private void UserControl1_Resize(object sender, EventArgs e)
{
DrawButton();
}
[Bindable(true)]
public bool Checked
{
get
{
return _checked;
}
set
{
_checked = value;
DrawButton();
NotifyPropertyChanged("Checked");
}
}
[Bindable(true)]
public String DisplayText
{
get
{
return _text;
}
set
{
_text = value;
DrawButton();
}
}
private void HandleClick( )
{
_checked = !_checked;
DrawButton();
NotifyPropertyChanged("Checked");
}
private void DrawButton()
{
//do some drawing stuff here
}
private void PopUpButton_Resize(object sender, EventArgs e)
{
DrawButton();
}
}
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