vb.net - VB.net 将任何 Ascii 值小于 32 或大于 126 的字符转换为空字符串

Question

我将如何创建一个接受字符串并用空字符串替换所有不可打印字符（<32 或 >126）的 vb.net 函数？

Answer 1

您可以逐个字符地遍历字符串：

Private Function Convert(input As String) As String
    Dim asArray As Char() = input.ToCharArray()
    For i As Integer = 0 To asArray.Length - 1
        If AscW(asArray(i)) < 32 OrElse AscW(asArray(i)) > 126 Then
            asArray(i) = " "C
        End If
    Next

    Return New String(asArray)
End Function

Answer 2

尝试这个。它使用一组合法字符，目前所有的 Ascii 值都在 32-126 之间。

Private Function convertChars(input As String) As String
    Const legalchars As String = " !""#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~"
    Dim rv As New System.Text.StringBuilder
    For Each c As Char In input
        If legalchars.IndexOf(c) > 0 Then rv.Append(c)
    Next
    Return rv.ToString
End Function

Answer 3

您也可以使用 LINQ：

    Dim startstring As String = "ferojifsdajknf" + Chr(0) + "sdiojufsda" + Chr(20) + "jikwfe"
    Dim result As String = Join((From c As Char In startstring                                     
                                Where Asc(c) >= 32 AndAlso Asc(c) <= 126
                                Let s = c.ToString
                                Select s).ToArray, "")

?startstring.ToCharArray
{Length=32}
    (0): "f"c
    (1): "e"c
    (2): "r"c
    (3): "o"c
    (4): "j"c
    (5): "i"c
    (6): "f"c
    (7): "s"c
    (8): "d"c
    (9): "a"c
    (10): "j"c
    (11): "k"c
    (12): "n"c
    (13): "f"c
    (14): "
    (15): "s"c
    (16): "d"c
    (17): "i"c
    (18): "o"c
    (19): "j"c
    (20): "u"c
    (21): "f"c
    (22): "s"c
    (23): "d"c
    (24): "a"c
    (25): ""c
    (26): "j"c
    (27): "i"c
    (28): "k"c
    (29): "w"c
    (30): "f"c
    (31): "e"c

?result.ToCharArray
{Length=30}
    (0): "f"c
    (1): "e"c
    (2): "r"c
    (3): "o"c
    (4): "j"c
    (5): "i"c
    (6): "f"c
    (7): "s"c
    (8): "d"c
    (9): "a"c
    (10): "j"c
    (11): "k"c
    (12): "n"c
    (13): "f"c
    (14): "s"c
    (15): "d"c
    (16): "i"c
    (17): "o"c
    (18): "j"c
    (19): "u"c
    (20): "f"c
    (21): "s"c
    (22): "d"c
    (23): "a"c
    (24): "j"c
    (25): "i"c
    (26): "k"c
    (27): "w"c
    (28): "f"c
    (29): "e"c