如何按VB.NET扩展名分组

这篇文章将为大家详细讲解有关如何按VB.NET扩展名分组，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。

VB.NET扩展名分组案例：

Public Class Form1  '按照扩展名分组文件  Private Sub button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button1.Click  Dim MyDir As String = Me.textBox1.Text  Dim MyFiles As IEnumerable(Of System.IO.FileInfo) = GetFiles(MyDir)  Dim MyQueryGroup = From MyFile In MyFiles _  Group MyFile By MyExt = MyFile.Extension.ToLower() _  Into MyFileGroup = Group _  Order By MyExt  Me.listBox1.Items.Clear()  For Each MyFileGroup In MyQueryGroup  Me.listBox1.Items.Add("包含" + MyFileGroup.MyExt + "扩展名的文件如下：")  For Each MyFileInfo In MyFileGroup.MyFileGroup  Me.listBox1.Items.Add(MyFileInfo.Name)  Next  Me.listBox1.Items.Add("")  Next  End Sub  '更多.net源码和实例，来自乐博网 www.lob.cn  Function GetFiles(ByVal MyDir As String) As IEnumerable(Of System.IO.FileInfo)  If (Not System.IO.Directory.Exists(MyDir)) Then  Throw New System.IO.DirectoryNotFoundException()  End If  Dim MyFileNames As String()  Dim MyFiles As List(Of System.IO.FileInfo) = New List(Of System.IO.FileInfo)()  '查找指定目录下的所有子目录中的所有文件  'MyFileNames = System.IO.Directory.GetFiles(MyDir, "*.*", _  'System.IO.SearchOption.AllDirectories)  MyFileNames = System.IO.Directory.GetFiles(MyDir)  For Each MyName As String In MyFileNames  MyFiles.Add(New System.IO.FileInfo(MyName))  Next  Return MyFiles  End Function  End Class

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