我有以下函数,它在目录中循环并检查指定的文件夹和文件:
Private Function VerifyPath(ByVal root As String, ByVal folder As String, _
ByVal file As String) As Boolean
Dim folders As New List(Of String), files As New List(Of String)
Dim oDir As New IO.DirectoryInfo(root)
For Each dir As IO.DirectoryInfo In oDir.GetDirectories
folders.Add(dir.Name.ToLower)
Next
If folders.Contains(folder) Then
For Each item As IO.FileInfo In oDir.GetFiles
files.Add(item.Name.ToLower)
Next
If files.Contains(file) Then
Return True
End If
End If
Return False
End Function
我之所以使用这种方法,是为了确保每个列表中的项目和传递的文件/文件夹都是小写,否则我会这样做:
If oDir.GetDirectories.Contains( _
New IO.DirectoryInfo(String.Format("{0}{1}", root, folder))) Then
If oDir.GetFiles.Contains( _
New IO.FileInfo(String.Format("{0}{1}", root, file))) Then
Return True
End If
End If
Return False
我的同事早些时候向我提到了可以通过使用比较器来忽略case。.Contains
扩展名可以有一个比较器参数和值。我在谷歌和MSDN上做了一些搜索,找到了以下比较器:
Public Class dirCompare
Implements IEqualityComparer(Of IO.DirectoryInfo)
Dim theCompare As CaseInsensitiveComparer
Sub New()
theCompare = CaseInsensitiveComparer.DefaultInvariant
End Sub
Sub New(ByVal culture As CultureInfo)
theCompare = New CaseInsensitiveComparer(culture)
End Sub
Public Function Equals1(ByVal x As System.IO.DirectoryInfo, ByVal y As System.IO.DirectoryInfo) As Boolean Implements System.Collections.Generic.IEqualityComparer(Of System.IO.DirectoryInfo).Equals
If theCompare.Compare(x.name, y.name) = 0 Then
Return True
Else
Return False
End If
End Function
Public Function GetHashCode1(ByVal obj As System.IO.DirectoryInfo) As Integer Implements System.Collections.Generic.IEqualityComparer(Of System.IO.DirectoryInfo).GetHashCode
Return obj.ToString.ToLower.GetHashCode
End Function
End Class
当它到达Compare(x.name,y.name)=0
行时,它会出错,这是错误消息:
<code>必须至少有一个对象实现IComparable代码>
有人知道这个错误意味着什么,以及如何纠正它吗?