在赋值前被使用。可能会在运行时导致空引用异常

为啥getmask(mask)中显示：变量“mask”在赋值前被使用。可能会在运行时导致空引用异常

怎样修改谢谢！

Option Explicit On

Sub getmask(ByVal mk() As Long)
        Dim i As Long
        ReDim mk(0 To 30)
        mk(1) = 1
        For i = 2 To 30
            mk(i) = mk(i - 1) * 2
        Next

    End Sub

 Private Sub Button12_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button12.Click
        Dim mask() As Long
        Dim add As Long
        add = 300
        getmask(mask)
        Dim sjStr(add - 1)
        Dim sj(1, add - 1)

[此贴子已经被作者于2023-3-4 21:35编辑过]