Me就是自己,指所在的那個(gè)窗體或過程。
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比如
Private Sub Form_Load()
Me.Width = 8000
Form1.Width = 8000
End Sub
在這個(gè)過程中的兩個(gè)代碼作用是一樣的。
Me.Close()在只有一個(gè)窗體的時(shí)候會(huì)關(guān)閉這個(gè)窗體,當(dāng)然程序也會(huì)自動(dòng)地關(guān)閉。否則只是關(guān)閉Me指代的窗體
End是直接結(jié)束進(jìn)程,很多后續(xù)操作會(huì)被忽略,推薦的程序關(guān)閉方法是Application.Exit()
me.close是關(guān)閉自身窗體,如果同時(shí)打開多個(gè)窗體,用me.close不能退出程序。
end是一個(gè)強(qiáng)大的退出指令,可以關(guān)閉所有窗體,并釋放所有已占用的資源(當(dāng)然有一些限制。所以自己主動(dòng)釋放是最好的)。
在以前的Web應(yīng)用中,上傳文件是個(gè)很麻煩的事,現(xiàn)在有了.NET,文件上傳變得輕而易舉。下面的這個(gè)例子實(shí)現(xiàn)了多文件上傳功能??梢詣?dòng)態(tài)添加輸入表單,上傳的文件數(shù)量沒有限制。代碼如下:
MultiUpload.aspx
%@ Page Language="vb" AutoEventWireup="false" Codebehind="MultiUpload.aspx.vb"
Inherits="aspxWeb.MultiUpload" %
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
HTML
HEAD
title多文件上傳/title
script language="JavaScript"
function addFile()
{
var str = 'INPUT type="file" size="50" NAME="File"'
document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str)
}
/script
/HEAD
body
form id="form1" method="post" runat="server" enctype="multipart/form-data"
center
asp:Label Runat="server" ID="MyTitle"/asp:Label
P id="MyFile"INPUT type="file" size="50" NAME="File"/P
P
input type="button" value="增加(Add)" _disabledevent="addFile()"
asp:Button Runat="server" Text="上傳" ID="Upload"/asp:Button
input _disabledevent="this.form.reset()" type="button" value="重置(ReSet)"
/P
/center
P align="center"
asp:Label id="strStatus" runat="server" Font-Names="宋體" Font-Bold="True"
Font-Size="9pt" Width="500px" BorderStyle="None" BorderColor="White"/asp:Label
/P
/form
/body
/HTML
后代碼:MultiUpload.aspx.vb
Public Class MultiUpload
Inherits System.Web.UI.Page
Protected WithEvents Upload As System.Web.UI.WebControls.Button
Protected WithEvents MyTitle As System.Web.UI.WebControls.Label
Protected WithEvents strStatus As System.Web.UI.WebControls.Label
#Region " Web Form Designer Generated Code "
'This call is required by the Web Form Designer.
System.Diagnostics.DebuggerStepThrough() Private Sub InitializeComponent()
End Sub
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
InitializeComponent()
End Sub
#End Region
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
MyTitle.Text = "h3多文件上傳/h3"
Upload.Text = "開始上傳"
If (Me.IsPostBack) Then Me.SaveImages()
End Sub
Private Function SaveImages() As System.Boolean
'遍歷File表單元素
Dim files As System.Web.HttpFileCollection = System.Web.HttpContext.Current.Request.Files
'狀態(tài)信息
Dim strMsg As New System.Text.StringBuilder("上傳的文件分別是:hr color=red")
Dim iFile As System.Int32
Try
For iFile = 0 To files.Count - 1
'檢查文件擴(kuò)展名字
Dim postedFile As System.Web.HttpPostedFile = files(iFile)
Dim fileName, fileExtension As System.String
fileName = System.IO.Path.GetFileName(postedFile.FileName)
If Not (fileName = String.Empty) Then
fileExtension = System.IO.Path.GetExtension(fileName)
strMsg.Append("上傳的文件類型:" + postedFile.ContentType.ToString() + "br")
strMsg.Append("客戶端文件地址:" + postedFile.FileName + "br")
strMsg.Append("上傳文件的文件名:" + fileName + "br")
strMsg.Append("上傳文件的擴(kuò)展名:" + fileExtension + "brhr")
'可根據(jù)擴(kuò)展名字的不同保存到不同的文件夾
postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath("images/") + fileName)
End If
Next
strStatus.Text = strMsg.ToString()
Return True
Catch Ex As System.Exception
strStatus.Text = Ex.Message
Return False
End Try
End Function
End Class
目前萬網(wǎng)虛擬主機(jī)針對(duì)無組件上傳免費(fèi)支持;aspxWeb.MultiUpload等組件,需要在萬網(wǎng)的獨(dú)立主機(jī)上注冊(cè)后使用,虛擬主機(jī)暫時(shí)無法支持。以上實(shí)例僅供參考。