未緩存for循環的值

Question

執行for循環時，緩存了To之後的值。

Dim m As Integer = 1 

    For x As Integer = 0 To m 
     Console.WriteLine(x) 
     m = 10 
    Next 

輸出是

0 
    1 

有沒有辦法不緩存值m？我可以解決這個問題的唯一方法是將For轉換爲While循環。

Answer 1

有沒有辦法讓它評估不止一次。從For..Next Statement Documentation (Visual Basic) (MSDN)

For counter [ As datatype ] = start To end [ Step step ] 
    [ statements ] 
    [ Continue For ] 
    [ statements ] 
    [ Exit For ] 
    [ statements ] 
Next [ counter ] 

當For ... Next循環開始時，Visual Basic評估開始，結束和步。 Visual Basic僅在此時評估這些值。