5

我确实创建了一个将变音符号转换为非变音符号的函数（基于这篇文章）

这是代码：

Public Function RemoveDiacritics(ByVal searchInString As String) As String
    Dim returnValue As String = ""

    Dim formD As String = searchInString.Normalize(System.Text.NormalizationForm.FormD)
    Dim unicodeCategory As System.Globalization.UnicodeCategory = Nothing
    Dim stringBuilder As New System.Text.StringBuilder()


    For formScan As Integer = 0 To formD.Length - 1
        unicodeCategory = System.Globalization.CharUnicodeInfo.GetUnicodeCategory(formD(formScan))
        If unicodeCategory <> System.Globalization.UnicodeCategory.NonSpacingMark Then
            stringBuilder.Append(formD(formScan))
        End If
    Next

    returnValue = stringBuilder.ToString().Normalize(System.Text.NormalizationForm.FormC)

    Return returnValue

End Function

不幸的是，由于 String.Normlize 不是 Silverlight 的一部分，我需要找到另一种方法来编写此函数。

到目前为止，我发现的唯一解决方案是在服务器端创建一个服务，该服务将调用 String.Normalize 函数，然后将其返回到客户端……但这会产生巨大的性能问题。

必须有更好的选择，但我知道我不知道如何解决这个问题。

4

2 回答 2

1

西蒙，

这是 Normalize() 的基本实现，调用了 Normalization 类：

public string Normalize ()
{
    return Normalization.Normalize (this, 0);
}

public string Normalize (NormalizationForm normalizationForm)
{
    switch (normalizationForm)
    {
        default:
            return Normalization.Normalize (this, 0);
        case NormalizationForm.FormD:
            return Normalization.Normalize (this, 1);
        case NormalizationForm.FormKC:
            return Normalization.Normalize (this, 2);
        case NormalizationForm.FormKD:
            return Normalization.Normalize (this, 3);
    }
}

您可以从 GitHub 上的 Mono 项目中浏览 Normalization 类的实现：

http://github.com/mono/mono/blob/mono-2.6.4/mcs/class/corlib/Mono.Globalization.Unicode/Normalization.cs

Good luck,
Jim McCurdy

于 2010-10-29T04:18:21.330 回答
1

Thanks for your answer Jim but I tried to implement the normalization class like the Mono Project did and at one point, I realized it was an overkill because there's way too many dependencies involved for something that should be simple.

I came up with this simple implementation... it's not perfect, I know (This won't work for every language) but it will do the job for me until MS release a version of Silverlight with string normalization support.

<System.Runtime.CompilerServices.Extension()> _    
Public Function RemoveDiacritics(ByVal searchInString As String) As String
    Dim returnValue As String = ""

    returnValue = searchInString

    returnValue = returnValue.ReplaceLowerAndUpperCase("À", "A")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Á", "A")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Â", "A")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Ã", "A")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Ä", "A")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Å", "A")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Æ", "A")

    returnValue = returnValue.ReplaceLowerAndUpperCase("Ç", "C")

    returnValue = returnValue.ReplaceLowerAndUpperCase("È", "E")
    returnValue = returnValue.ReplaceLowerAndUpperCase("É", "E")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Ê", "E")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Ë", "E")

    returnValue = returnValue.ReplaceLowerAndUpperCase("Ì", "I")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Í", "I")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Î", "I")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Ï", "I")

    returnValue = returnValue.ReplaceLowerAndUpperCase("Ñ", "N")

    returnValue = returnValue.ReplaceLowerAndUpperCase("Ò", "O")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Ó", "O")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Ô", "O")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Õ", "O")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Ö", "O")

    returnValue = returnValue.ReplaceLowerAndUpperCase("Ù", "U")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Ú", "U")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Û", "U")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Ü", "U")

    returnValue = returnValue.ReplaceLowerAndUpperCase("Ý", "Y")

    returnValue = returnValue.ReplaceLowerAndUpperCase("Æ", "AE")
    returnValue = returnValue.ReplaceLowerAndUpperCase("Œ", "OE")

    Return returnValue

End Function

<System.Runtime.CompilerServices.Extension()> _
Public Function ReplaceLowerAndUpperCase(ByVal searchInString As String, ByVal oldString As String, ByVal newString As String) As String
    Dim returnValue As String = ""

    returnValue = searchInString.Replace(oldString.ToLower, newString.ToLower)
    returnValue = returnValue.Replace(oldString.ToUpper, newString.ToUpper)

    Return returnValue
End Function
于 2010-11-17T15:38:59.057 回答