filedirserver.vb

是可以运行的电子光盘 有程序与PPT介绍 对于学习VB。NET的有参考意义

Imports Microsoft.VisualBasic
Imports System.io
Imports System.Data
Imports System.Web
Public Class FileDirServer
    '获取用户目录的大小,有问题,当目录下没有文件只有目录时,统计有误
    Public Shared Function GetDirectorySize(ByVal thePath As String) As Long
        Dim dirSize As Long
        Dim dir As DirectoryInfo = New DirectoryInfo(thePath)
        ' Add the size of each file
        Dim theFile As FileInfo
        If dir.GetFiles.Length <> 0 Then
            For Each theFile In dir.GetFiles()

                dirSize = dirSize + theFile.Length

                ' Add the size of each subdirectory, retrieved by 
                ' recursively calling this same function
                Dim subDir As DirectoryInfo
                For Each subDir In dir.GetDirectories
                    dirSize = dirSize + GetDirectorySize(subDir.FullName)
                Next
            Next
        Else
            Dim subDir As DirectoryInfo
            For Each subDir In dir.GetDirectories
                dirSize = dirSize + GetDirectorySize(subDir.FullName)
            Next
        End If

        Return dirSize

    End Function
    Public Shared Function GetDirectorySize(ByVal DirInfo As DirectoryInfo) As Long
        Dim dirSize As Long
        ' Dim dir As DirectoryInfo = New DirectoryInfo(thePath)
        ' Add the size of each file
        Dim theFile As FileInfo
        If DirInfo.GetFiles.Length <> 0 Then
            For Each theFile In DirInfo.GetFiles()
                dirSize = dirSize + theFile.Length

                ' Add the size of each subdirectory, retrieved by 
                ' recursively calling this same function
                Dim subDir As DirectoryInfo
                For Each subDir In DirInfo.GetDirectories
                    dirSize = dirSize + GetDirectorySize(subDir)
                Next
            Next
        Else
            Dim subDir As DirectoryInfo
            For Each subDir In DirInfo.GetDirectories
                dirSize = dirSize + GetDirectorySize(subDir)
            Next
        End If
        Return dirSize
    End Function
    '获取用户目录中文件的个数,同时获取用户目录下所有目录的个数
    Public Shared Function GetFileCount(ByVal thePath As String, ByRef dirCount As Long) As Long
        Dim fileCount As Long
        '  Dim dirCount As Long
        Dim dir As DirectoryInfo = New DirectoryInfo(thePath)
        ' Add the size of each file

        fileCount = fileCount + dir.GetFiles().Length

        ' Add the size of each subdirectory, retrieved by 
        ' recursively calling this same function
        Dim subDir As DirectoryInfo
        For Each subDir In dir.GetDirectories
            dirCount += 1
            fileCount = fileCount + GetFileCount(subDir.FullName, dirCount)
        Next

        Return fileCount

    End Function
    '返回以兆为单位的大小
    Public Shared Function FormatSize(ByVal fileSize As Double) As String

        If fileSize < 1024 Then
            Return String.Format("{0:N0} B", fileSize)
        ElseIf (fileSize < 1024 * 1024) Then
            Return String.Format("{0:N2} KB", fileSize / 1024)
        Else
            Return String.Format("{0:N2} MB", fileSize / (1024 * 1024))
        End If

    End Function

    '根据扩展名,到xml文件中查找该扩展名,找到即为文本文件Server.MapPath("~/XML/TextExtend.xml")
    Public Shared Function IsTextFile(ByVal Extension As String, ByVal CompareFile As String) As Boolean
        Dim ds As New DataSet
        If File.Exists(CompareFile) Then
            ds.ReadXml(CompareFile)
        Else
            '"~/XML/TextExtend.xml"文件不存在则建立该文件
            Dim dt As DataTable = ds.Tables.Add("FileExtension")
            dt.Columns.Add("Name")
            '建立一行数据
            Dim Value() As String = {".txt"}
            dt.Rows.Add(Value)
            ds.WriteXml(CompareFile)
        End If
        Dim dv As DataView
        dv = ds.Tables("FileExtension").DefaultView
        dv.Sort = "Name"
        Dim RowIndex As Integer = dv.Find(Extension)
        If RowIndex > -1 Then '找到
            Return True
        Else
            Return False
        End If
    End Function
    '根据文件名返回该文件类型的图标文件名，例d:\hj\jsjdjks.doc,返回~\filetype\doc.gif
    Public Shared Function GetGifByFileName(ByVal FilePath As String) As String
        '根据FileName获得扩展名
        Dim tempGif As String
        Dim Index As Integer
        tempGif = FilePath
        Index = tempGif.LastIndexOf(".")
        '没有扩展名时，index=-1
        If Index = -1 Then
            tempGif = "~/filetype/smileface.gif"
        Else
            tempGif = Mid(tempGif, Index + 2) & ".gif"
            tempGif = "~/filetype/" & tempGif
        End If
        Return tempGif
    End Function
    '从全路径中提取不含路径信息的文件名
    Public Shared Function GetFileNameFromPath(ByVal thePath As String) As String
        'Dim Index As Integer
        'Index = thePath.LastIndexOf("\")
        'If Index > 0 Then
        '    Return Mid(thePath, Index + 2)
        'End If
        'Index = thePath.LastIndexOf(":")
        'If Index > 0 Then
        '    Return Mid(thePath, Index + 2)
        'End If
        'Return Nothing
        Return Path.GetFileName(thePath)
    End Function

    '根据登陆用户，从配置文件web.config获取网络硬盘目录，返回物理用户目录
    'Public Shared Function GetUserDir(ByVal UserName As String) As String
    '    '   Dim UserDirCookie As New HttpCookie("UserDir")
    '    If IsNothing(Data.C_ServerDir) Or Data.C_ServerDir = "" Then
    '        '  UserDirCookie("UserDir") = "FALSE"
    '        Return String.Empty
    '    Else
    '        '判断目录后面有没有“\”,目录后就加上
    '        If Not Data.C_ServerDir.EndsWith("\") Then
    '            Data.C_ServerDir &= "\"
    '        End If
    '        '对目录进行编码
    '        '将服务目录存储在会话中

    '        ' HttpContext.Current.Session("ServerDir") = Data.C_ServerDir
    '        '存贮根目录在会话中
    '        Return Data.C_ServerDir & Trim(UserName)
    '        'UserDirCookie("UserDir") = Server.UrlEncode(Data.C_ServerDir & Trim(UserName))
    '    End If
    '    ' Response.Cookies.Add(UserDirCookie)
    'End Function
    '根据登陆用户，从配置文件web.config获取网络硬盘目录，返回物理用户目录
    Public Shared Function GetUserDir(ByVal User As String) As String
        '   Dim UserDirCookie As New HttpCookie("UserDir")
        If IsNothing(Data.C_ServerDir) Or Data.C_ServerDir = "" Then
            '  UserDirCookie("UserDir") = "FALSE"
            Return String.Empty
        Else
            '判断目录后面有没有“\”,目录后就加上
            If Not Data.C_ServerDir.EndsWith("\") Then
                Data.C_ServerDir &= "\"
            End If
            '对目录进行编码
            '将服务目录存储在会话中

            ' HttpContext.Current.Session("ServerDir") = Data.C_ServerDir
            '存贮根目录在会话中
            Return Data.C_ServerDir & Trim(User)
            'UserDirCookie("UserDir") = Server.UrlEncode(Data.C_ServerDir & Trim(UserName))
        End If
        ' Response.Cookies.Add(UserDirCookie)
    End Function
    '返回去除服务目录后的路径
    Public Shared Function ShowMapPath(ByVal FullPath As String) As String
        Try
            Dim strPath As String = Mid(FullPath, Len(Data.C_ServerDir))
            If Left(strPath, 1) = "\" Then
                Return strPath
            Else
                Return "\" + strPath
            End If
        Catch ex As Exception
            Return Nothing
        End Try

    End Function
End Class