Cannot convert lambda expression to type 'System.Delegate' because it is not a delegate type? [duplicate]

Answer 1

You have to cast it explicitly to a Action in order for the conversion to System.Delegate to kick in.

That is:

_map.Dispatcher.BeginInvoke((Action)(() =>
{
    _map.Children.Clear();
    foreach (var projectedPin in pinsToAdd.Where(pin => PointIsVisibleInMap(pin.ScreenLocation, _map)))
    {
        _map.Children.Add(projectedPin.GetElement(ClusterTemplate));
    }
}));

Answer 2

The BeginInvoke() method's parameter is the base Delegate class.

You can only convert a lambda expression to a concrete delegate type.

To fix this issue, you need to explicitly construct a delegate:

BeginInvoke(new MethodInvoker(() => { ... }));

Answer 3

Try

Dispatcher.BeginInvoke(new System.Threading.ThreadStart(delegate
{
//Do something
}));

Or use Action