Visual Basic錯誤「變量之前使用......」

Question

請幫幫我！我寫了下面的程序，有一個錯誤「變量」arr「之前使用...」我試圖修復，但我不能。請幫助我:)非常感謝！

Imports System 
Imports System.IO 

Class Test 
    Public Shared Sub Main() 
     Try 
      ' Create an instance of StreamReader to read from a file. 
      Dim sr As StreamReader = New StreamReader("a.txt") 
      Dim line As String 
      Dim arr()() As Char 
      Dim tem As Integer 
      tem = 1 
      ' Read and display the lines from the file until the end 
      ' of the file is reached. 
      Do 
       line = sr.ReadLine() 
       arr(tem) = line.ToCharArray 
       Console.WriteLine(Line) 
      Loop Until line Is Nothing 
      sr.Close() 
     Catch E As Exception 
      ' Let the user know what went wrong. 
      Console.WriteLine("The file could not be read:") 
      Console.WriteLine(E.Message) 
     End Try 
    End Sub 
End Class 

Module Module1 
    Sub Main() 
     Test.Main() 
    End Sub 
End Module 

Answer 1

您需要初始化arr變量。

既然你不知道數組需要有多大是，你應該使用List(Of T)代替。