Winforms用户控制自定义事件

Question

有没有办法提供用户控件自定义事件，并在用户控件中的事件上调用事件。 （我不确定调用是否是正确的术语）

public partial class Sample: UserControl
{
    public Sample()
    {
        InitializeComponent();
    }


    private void TextBox_Validated(object sender, EventArgs e)
    {
        // invoke UserControl event here
    }
}

和MainForm：

public partial class MainForm : Form
{
    private Sample sampleUserControl = new Sample();

    public MainForm()
    {
        this.InitializeComponent();
        sampleUserControl.Click += new EventHandler(this.CustomEvent_Handler);
    }
    private void CustomEvent_Handler(object sender, EventArgs e)
    {
        // do stuff
    }
}

Answer 1

除了Steve发布的示例之外，还有可用的语法，可以简单地传递事件。 它类似于创建属性：

class MyUserControl : UserControl
{
   public event EventHandler TextBoxValidated
   {
      add { textBox1.Validated += value; }
      remove { textBox1.Validated -= value; }
   }
}

Answer 2

我相信你想要的是这样的：

public partial class Sample: UserControl
{
    public event EventHandler TextboxValidated;

    public Sample()
    {
        InitializeComponent();
    }


    private void TextBox_Validated(object sender, EventArgs e)
    {
        // invoke UserControl event here
        if (this.TextboxValidated != null) this.TextboxValidated(sender, e);
    }
}

然后在你的表格上：

public partial class MainForm : Form
{
    private Sample sampleUserControl = new Sample();

    public MainForm()
    {
        this.InitializeComponent();
        sampleUserControl.TextboxValidated += new EventHandler(this.CustomEvent_Handler);
    }
    private void CustomEvent_Handler(object sender, EventArgs e)
    {
        // do stuff
    }
}