檢查通用參數類型是否來自某個類別X

Question

檢查類型參數是否爲某類型X（或源自某個類型X）的正確方法是什麼？例如。

Function MyFunc(Of T As BaseClass)() As T 
    If TypeOf T Is GetType(ChildClass1) Then 
    'Do something specific to ChildClass1 
    End If 

    'Do things common to all BaseClass objects 
End Function 

上述代碼不編譯，有或沒有TypeOf。

Answer 1

將TypeOf T替換爲GetType(T)。
您的代碼應該是這樣的：

Function MyFunc(Of T As BaseClass)() As T 
    If GetType(T) Is GetType(ChildClass1) Then 
    'Do something specific to ChildClass1 
    End If 

    'Do things common to all BaseClass objects 
End Function