vba ReDim 语句是否使用空字符串初始化字符串数组？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/1584263/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Does the ReDim statement initialise String Arrays with empty strings?
提问by Kevin Boyd
Given the following statements in VBA:
Assume that val = 4and Option Base 0
鉴于 VBA 中的以下语句：
假设val = 4和Option Base 0
Dim dataStr() As String
ReDim dataStr(val)
Will the ReDim statement initialise the String array dataStr to 5 empty string elements(0 to 4).
What exactly will be the contents of the Array after the execution of the ReDim statement.
ReDim 语句是否会将字符串数组 dataStr 初始化为 5 个空字符串元素（0 到 4）。
执行 ReDim 语句后 Array 的内容究竟是什么。
采纳答案by Mike Woodhouse
Sub RedimStringArray()
Dim Val As Integer
Dim dataStr() As String
Dim idx As Long
Val = 4
ReDim dataStr(Val)
For idx = LBound(dataStr) To UBound(dataStr)
Debug.Print idx, """" & dataStr(idx); """", TypeName(dataStr(idx)), Len(dataStr(idx))
Next
End Sub
gives me this:
给我这个：
0 "" String 0
1 "" String 0
2 "" String 0
3 "" String 0
4 "" String 0
So I'd say that yes, ReDim re-initializes the array with empty strings.
所以我会说是的，ReDim 用空字符串重新初始化数组。
回答by MarkJ
You could just read the VB6 manual page on ReDim?
When variables are initialized, a variable-length string is initialized to a zero-length string (""), and a fixed-length string is filled with zeros
变量初始化时，变长字符串初始化为零长度字符串("")，固定长度字符串用零填充
回答by jtolle
Just to confirm the answer from Mike Woodhouse, see section 5.4.3.3 of the VBA Language Specification:
只是为了确认 Mike Woodhouse 的回答，请参阅 VBA 语言规范的第 5.4.3.3 节：
http://msdn.microsoft.com/en-us/library/dd361851%28PROT.10%29.aspx
http://msdn.microsoft.com/en-us/library/dd361851%28PROT.10%29.aspx
Each array in a <redim-statement> is resized according to the dimensions specified in its <bounds-list>. Each element in the array is reset to the default value for its data type, unless the word “preserve” is specified.
<redim-statement> 中的每个数组都根据其 <bounds-list> 中指定的维度调整大小。除非指定了“保留”一词，否则数组中的每个元素都将重置为其数据类型的默认值。
