public void AddHandler_MultipleInSameKey_Getter_CombinedDelegates()
{
var list = new EventHandlerList();
// Create two delegates that will increase total by different amounts
int total = 0;
Action a1 = () => total += 1;
Action a2 = () => total += 2;
// Add both delegates for the same key and make sure we get them both out of the indexer
list.AddHandler("key1", a1);
list.AddHandler("key1", a2);
list["key1"].DynamicInvoke();
Assert.Equal(3, total);
// Remove the first delegate and make sure the second delegate can still be retrieved
list.RemoveHandler("key1", a1);
list["key1"].DynamicInvoke();
Assert.Equal(5, total);
// Remove a delegate that was never in the list; nop
list.RemoveHandler("key1", new Action(() => { }));
list["key1"].DynamicInvoke();
Assert.Equal(7, total);
// Then remove the second delegate
list.RemoveHandler("key1", a2);
Assert.Null(list["key1"]);
}
public void AddHandler_Getter_RemoveHandler_Getter_Roundtrips()
{
var list = new EventHandlerList();
// Create two different delegate instances
Action a1 = () => Assert.True(false);
Action a2 = () => Assert.False(true);
Assert.NotSame(a1, a2);
// Neither entry in the list has a delegate
Assert.Null(list["key1"]);
Assert.Null(list["key2"]);
// Add the first delegate to the first entry
list.AddHandler("key1", a1);
Assert.Same(a1, list["key1"]);
Assert.Null(list["key2"]);
// Add the second delegate to the second entry
list.AddHandler("key2", a2);
Assert.Same(a1, list["key1"]);
Assert.Same(a2, list["key2"]);
// Then remove the first delegate
list.RemoveHandler("key1", a1);
Assert.Null(list["key1"]);
Assert.Same(a2, list["key2"]);
// And remove the second delegate
list.RemoveHandler("key2", a2);
Assert.Null(list["key1"]);
Assert.Null(list["key2"]);
}
private void GenerateCards()
{
YourScore.Show();
YourScore.Text = "Your Score: 0";
OpponentsScore.Show();
OpponentsScore.Text = "Opponent's Score: 0";
_opponentPic = new PictureBox
{
Name = "Opponent's Card",
Image = Resources.card_back_blue,
Location = new Point(Width - 125, 10),
Size = new Size(100, 114),
SizeMode = PictureBoxSizeMode.StretchImage
};
Controls.Add(_opponentPic);
Point nextLocation = new Point(10, 134);
for (int i = 0; i < 10; i++)
{
PictureBox currentPic = new PictureBox
{
Name = "picDynamic" + i,
Image = Resources.card_back_red,
Location = nextLocation,
Size = new Size(100, 114),
SizeMode = PictureBoxSizeMode.StretchImage
};
currentPic.Click += (sender, e) => {
if (!string.IsNullOrEmpty(_drawnCard))
{
return;
}
// Generate a random card
_drawnCard = RandomCard();
currentPic.Name = _drawnCard;
currentPic.Image = (Image)Resources.ResourceManager.GetObject(FileNameByCard(currentPic.Name));
_amountOfOpenedCards++;
// Send the Generated card
BeginSend("1" + currentPic.Name);
// Receive an answer
BeginRead();
// Remove click event handler
FieldInfo currentPicFieldInfo = typeof(Control).GetField("EventClick",
BindingFlags.Static | BindingFlags.NonPublic);
object obj = currentPicFieldInfo?.GetValue(currentPic);
PropertyInfo currentPicPropertyInfo = currentPic.GetType().GetProperty("Events",
BindingFlags.NonPublic | BindingFlags.Instance);
EventHandlerList list = (EventHandlerList)currentPicPropertyInfo?.GetValue(currentPic, null);
list?.RemoveHandler(obj, list[obj]);
};
Controls.Add(currentPic);
nextLocation.X += currentPic.Size.Width + 10;
MainButton.Text = "Forfiet";
}
}
/// <summary>
/// 移除按钮点击事件
/// </summary>
/// <param name="button">按钮</param>
public static void RemoveClickEvent(this Button button)
{
FieldInfo f1 = typeof(Control).GetField("EventClick", BindingFlags.Static | BindingFlags.NonPublic);
if (f1 == null)
{
return;
}
object obj = f1.GetValue(button);
PropertyInfo pi = button.GetType().GetProperty("Events", BindingFlags.NonPublic | BindingFlags.Instance);
if (pi != null && obj != null)
{
EventHandlerList list = (EventHandlerList)pi.GetValue(button, null);
list?.RemoveHandler(obj, list[obj]);
}
}
public void RemoveHandler_EmptyList_Nop()
{
var list = new EventHandlerList();
list.RemoveHandler("key1", new Action(() => { })); // no error
}
