Unsubscribe anonymous method in C#

Question

Is it possible to unsubscribe an anonymous method from an event?

If I subscribe to an event like this:

void MyMethod()
{
    Console.WriteLine(\"I di         


        

Answer 1

If the best way is to keep a reference on the subscribed eventHandler, this can be achieved using a Dictionary.

In this example, I have to use a anonymous method to include the mergeColumn parameter for a set of DataGridViews.

Using the MergeColumn method with the enable parameter set to true enables the event while using it with false disables it.

static Dictionary subscriptions = new Dictionary();

public static void MergeColumns(this DataGridView dg, bool enable, params ColumnGroup[] mergedColumns) {

    if(enable) {
        subscriptions[dg] = (s, e) => Dg_Paint(s, e, mergedColumns);
        dg.Paint += subscriptions[dg];
    }
    else {
        if(subscriptions.ContainsKey(dg)) {
            dg.Paint -= subscriptions[dg];
            subscriptions.Remove(dg);
        }
    }
}