How to remove all event handlers from an event
.net, c#, events, winforms
Solution
I found a solution on the MSDN forums. The sample code below will remove all `Click` events from `button1`.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
button1.Click += button1_Click;
button1.Click += button1_Click2;
button2.Click += button2_Click;
}
private void button1_Click(object sender, EventArgs e) => MessageBox.Show("Hello");
private void button1_Click2(object sender, EventArgs e) => MessageBox.Show("World");
private void button2_Click(object sender, EventArgs e) => RemoveClickEvent(button1);
private void RemoveClickEvent(Button b)
{
FieldInfo f1 = typeof(Control).GetField("EventClick",
BindingFlags.Static | BindingFlags.NonPublic);
object obj = f1.GetValue(b);
PropertyInfo pi = b.GetType().GetProperty("Events",
BindingFlags.NonPublic | BindingFlags.Instance);
EventHandlerList list = (EventHandlerList)pi.GetValue(b, null);
list.RemoveHandler(obj, list[obj]);
}
}
Problem
To create a new event handler on a control you can do this ``` c.Click += new EventHandler(mainFormButton_Click); ``` or this ``` c.Click += mainFormButton_Click; ``` and to remove an event handler you can do this ``` c.Click -= mainFormButton_Click; ``` But how do you remove all event handlers from an event?