如何根据字符列表阻止用户输入？

Handled

KeyPress

var l = new List<char>();
l.AddRange(Path.GetInvalidFileNameChars());
l.AddRange(Path.GetInvalidPathChars());

this.KeyPress += (s, e) =>
{
    e.Handled = l.Any(x => x == e.KeyChar);
};

e.Handled = true;

e.SupressKeyPress;