vb.net 变量“fs”在封闭块中隐藏变量
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Variable 'fs' hides variable in an enclosing block
提问by Charlie Stuart
I am currently using the following code:
我目前正在使用以下代码：
Public Sub CreateScore()
' open isolated storage, and write the savefile.
Dim fs As IsolatedStorageFileStream = Nothing
Using fs = savegameStorage.CreateFile("Score")
If fs IsNot Nothing Then
' just overwrite the existing info for this example.
Dim bytes As Byte() = System.BitConverter.GetBytes(Scorecount)
fs.Write(bytes, 0, bytes.Length)
End If
End Using
End Sub
However the fs after using is underlined in blue and gives the error Variable 'fs' hides variable in an enclosing block.
但是，使用后的 fs 用蓝色下划线标出，并给出错误 Variable 'fs' hides variable in a enclosure block。
Does anybody know how i can fix this?
有谁知道我该如何解决这个问题？
采纳答案by Douglas Barbin
You are declaring the variable, then using that same variable name in a Usingblock (which tries to declare it again).
您正在声明变量，然后在Using块中使用相同的变量名（它试图再次声明它）。
Change it to this:
改成这样：
Public Sub CreateScore()
' open isolated storage, and write the savefile.
Using fs As IsolateStorageFileStream = savegameStorage.CreateFile("Score")
If fs IsNot Nothing Then
' just overwrite the existing info for this example.
Dim bytes As Byte() = System.BitConverter.GetBytes(Scorecount)
fs.Write(bytes, 0, bytes.Length)
End If
End Using
End Sub
回答by Jon Egerton
You don't need the Dim fs...line - the Usingstatement covers the declaration.
您不需要该Dim fs...行 - 该Using声明涵盖了声明。
The Usingstatement on its own should be fine as you have it, but if you want to be sure of the typing then change it to:
该Using语句本身应该没问题，但是如果您想确定输入，则将其更改为：
Using fs As IsolatedStorageFileStream = savegameStorage.CreateFile("Score")
...
