Winforms 如何在复选框中查找检查状态更改的来源
在CheckedChanged事件中,我想知道是哪个操作触发了此更改,或者是用户显式单击了复选框,或者是从数据绑定更新的Winforms 如何在复选框中查找检查状态更改的来源,winforms,Winforms,在CheckedChanged事件中,我想知道是哪个操作触发了此更改,或者是用户显式单击了复选框,或者是从数据绑定更新的 public partial class Form1 : Form { public Form1() { InitializeComponent(); Source = new ValueSource(); this.checkBox1.DataBindings.Add(new Binding("Checked"
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
Source = new ValueSource();
this.checkBox1.DataBindings.Add(new Binding("Checked", Source, "State", false, DataSourceUpdateMode.OnPropertyChanged));
this.checkBox1.CheckedChanged += new EventHandler(checkBox1_CheckedChanged);
}
void checkBox1_CheckedChanged(object sender, EventArgs e)
{
// databinding changed the value.
MessageBox.Show("Value changed from data binding");
// user checked the check box using mouse.
MessageBox.Show("Value changed due to use action");
}
public ValueSource Source { get; set; }
}
public class ValueSource
{
private bool state = true;
public bool State
{
get { return state; }
set { state = value; }
}
}
我认为最好的方法是分别处理“CollectionChanged”和“click”事件。我认为您必须尝试处理鼠标和键盘事件:
public ValueSource Source { get; set; }
private bool _FromUser = false;
public Form1() {
InitializeComponent();
Source = new ValueSource();
this.checkBox1.DataBindings.Add(new Binding("Checked", Source, "State", false, DataSourceUpdateMode.OnPropertyChanged));
this.checkBox1.CheckedChanged += new EventHandler(checkBox1_CheckedChanged);
this.checkBox1.MouseDown += new MouseEventHandler(checkBox1_MouseDown);
this.checkBox1.MouseUp += new MouseEventHandler(checkBox1_MouseUp);
this.checkBox1.KeyDown += new KeyEventHandler(checkBox1_KeyDown);
this.checkBox1.KeyUp += new KeyEventHandler(checkBox1_KeyUp);
}
void checkBox1_KeyDown(object sender, KeyEventArgs e) {
_FromUser = true;
}
void checkBox1_KeyUp(object sender, KeyEventArgs e) {
_FromUser = false;
}
void checkBox1_MouseDown(object sender, MouseEventArgs e) {
_FromUser = true;
}
void checkBox1_MouseUp(object sender, MouseEventArgs e) {
_FromUser = false;
}
void checkBox1_CheckedChanged(object sender, EventArgs e) {
MessageBox.Show("From User = " + _FromUser.ToString());
}
此外,ValueSource类应实现INotifyPropertyChanged
事件:
public class ValueSource : INotifyPropertyChanged {
public event PropertyChangedEventHandler PropertyChanged;
private bool state = true;
public bool State {
get { return state; }
set {
state = value;
OnPropertyChanged("State");
}
}
private void OnPropertyChanged(string propertyName) {
if (PropertyChanged != null) {
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
此问题在延迟状态下关闭。您可能想钩住复选框的
鼠标
相关事件并加以区分?