丟擲異常

當發生異常時，你的程式碼可以並且經常應該丟擲異常。

public void WalkInto(Destination destination)
{
    if (destination.Name == "Mordor")
    {
        throw new InvalidOperationException("One does not simply walk into Mordor.");
    }
    // ... Implement your normal walking code here.
}