C# 忽略不区分大小写的字典键中的连字符

我在asp.net/vb.net中有一个不区分大小写的字典，如下所示：

Dim caseInsensitiveDictionary = New Dictionary(Of String, Single)(StringComparer.OrdinalIgnoreCase)

Response.Write(dictionary("ONE-hundred").ToString)

public class MyEqualityComparer : IEqualityComparer<string>
{
    public bool Equals(string x, string y)
    {
        return FixString(x).Equals(FixString(y), StringComparison.InvariantCultureIgnoreCase);
    }

    private string FixString(string x)
    {
        // replace hyphens
        return x.Replace("-", " ");
    }

    public int GetHashCode(string obj)
    {
        return FixString(obj).GetHashCode();
    }
}

它持有这样的价值观

one hundred, 100
one hundred one, 101
one hundred two, 102

我希望，如果用户试图找到如下值：

Dim caseInsensitiveDictionary = New Dictionary(Of String, Single)(StringComparer.OrdinalIgnoreCase)

Response.Write(dictionary("ONE-hundred").ToString)

public class MyEqualityComparer : IEqualityComparer<string>
{
    public bool Equals(string x, string y)
    {
        return FixString(x).Equals(FixString(y), StringComparison.InvariantCultureIgnoreCase);
    }

    private string FixString(string x)
    {
        // replace hyphens
        return x.Replace("-", " ");
    }

    public int GetHashCode(string obj)
    {
        return FixString(obj).GetHashCode();
    }
}

他得到100，但现在它得到了例外，因为字典键没有连字符“-”。我需要覆盖哪个方法

---

请建议您必须创建一个自定义的IEqualityComparer

大概是这样的：

Dim caseInsensitiveDictionary = New Dictionary(Of String, Single)(StringComparer.OrdinalIgnoreCase)

Response.Write(dictionary("ONE-hundred").ToString)

public class MyEqualityComparer : IEqualityComparer<string>
{
    public bool Equals(string x, string y)
    {
        return FixString(x).Equals(FixString(y), StringComparison.InvariantCultureIgnoreCase);
    }

    private string FixString(string x)
    {
        // replace hyphens
        return x.Replace("-", " ");
    }

    public int GetHashCode(string obj)
    {
        return FixString(obj).GetHashCode();
    }
}

公共类MyEqualityComparer:IEqualityComparer
{
公共布尔等于（字符串x、字符串y）
{
返回FixString（x）.Equals（FixString（y），StringComparison.InvariantCultureIgnoreCase）；
}
私有字符串固定字符串（字符串x）
{
//替换连字符
返回x.Replace（“-”，”）；
}
public int GetHashCode（字符串obj）
{
返回FixString（obj）.GetHashCode（）；
}
}

然后在字典中使用该类：

---

Dictionary x=new Dictionary（new MyEqualityComparer（））

您可以将

100100

以及添加到字典（最简单的方法）或构建自定义

StringComparer

：

Class CaseInsensitiveIgnoringStringComparer
    Inherits StringComparer
    Private caseInsentiveComparer As System.StringComparer = StringComparer.OrdinalIgnoreCase
    Public Property IgnoreList As IList(Of String) = Nothing
    Public Property ReplaceWith As String = " "

    Private Function Replace(original As String) As String
        If IgnoreList Is Nothing OrElse IgnoreList.Count = 0 Then
            Return original
        Else
            For Each s As String In IgnoreList
                original = original.Replace(s, ReplaceWith)
            Next
            Return original
        End If
    End Function

    Public Overloads Overrides Function Compare(x As String, y As String) As Integer
        Return caseInsentiveComparer.Compare(Replace(x), Replace(y))
    End Function

    Public Overloads Overrides Function Equals(x As String, y As String) As Boolean
        Return caseInsentiveComparer.Equals(Replace(x), Replace(y))
    End Function

    Public Overloads Overrides Function GetHashCode(obj As String) As Integer
        Return caseInsentiveComparer.GetHashCode(Replace(obj))
    End Function
End Class

测试

Dim comp = New CaseInsensitiveIgnoringStringComparer() With {.IgnoreList = {"-", "+"}, .ReplaceWith = " "}
Dim caseInsensitiveDictionary = New Dictionary(Of String, Single)(comp)
caseInsensitiveDictionary.Add("One hundred", 100)
caseInsensitiveDictionary.Add("One hundred one", 101)
caseInsensitiveDictionary.Add("One hundred two", 102)

' normally following both lines would cause exceptions '
Dim n100 = caseInsensitiveDictionary("ONE-hundred")
n100 = caseInsensitiveDictionary("oNE+Hundred")

---

你为什么不简单地加上100个呢？这是否意味着我需要为每个数字加上两个键？一百换一百？一百换四把钥匙（或者一百零一、一百零一、一百零一……（实际上最后一把有点长）和我要说的差不多，但是将

InvariantCultureIgnoreCase

更改为

ordinarignionorecase

@Rawling InvariantCultureIgnoreCase和OrdinalIgoneCase之间的区别是什么？@DotnetSparrow我之所以做出这样的评论，是因为您在自己的代码中使用了

Ordinal

而不是

InvariantCulture

，我不是100%确定这一区别我自己。好的，谢谢。我在以下位置收到声明预期错误：IEqualityComparerRight，应替换为“”。道格拉斯已经修好了。谢谢。我对另一个答案投了更高的票，因为它没有重复

.Replace（“-”，”）

代码，即使VB答案对VB问题更有意义。@Douglas:另一个答案不起作用，因为它用空字符串代替了空格。好的观点，修复了。（因为是干的，所以只在一行上进行了修复，）