¿Cómo convertir un int en un enum?

YourEnum foo = (YourEnum) Enum.Parse(typeof(YourEnum), yourString);
// the foo.ToString().Contains(",") check is necessary for enumerations marked with an [Flags] attribute
if (!Enum.IsDefined(typeof(YourEnum), foo) && !foo.ToString().Contains(","))
  throw new InvalidOperationException($"{yourString} is not an underlying value of the YourEnum enumeration.")

YourEnum foo = (YourEnum)yourInt;

YourEnum foo = (YourEnum)Enum.ToObject(typeof(YourEnum) , yourInt);

MyEnum e = (MyEnum)3;

if (Enum.IsDefined(typeof(MyEnum), 3)) { ... }

int one = 1;
MyEnum e = (MyEnum)one;