程序師世界是廣大編程愛好者互助、分享、學習的平台,程序師世界有你更精彩!
首頁
編程語言
C語言|JAVA編程
Python編程
網頁編程
ASP編程|PHP編程
JSP編程
數據庫知識
MYSQL數據庫|SqlServer數據庫
Oracle數據庫|DB2數據庫
 程式師世界 >> 編程語言 >> .NET網頁編程 >> C# >> 關於C# >> asp.net上傳圖片並生成縮略圖實現代碼

asp.net上傳圖片並生成縮略圖實現代碼

編輯:關於C#
 

<script language="VB" runat="server">
Sub UploadFile(sender As Object, e As EventArgs)

If FileUp.PostedFile.ContentLength = 0 Then
FileInfo.Visible = False
Exit Sub
Else
FileInfo.Visible = True
FDisplay1.Visible = True
End If

FSize.Text ="上傳文件大小"+ CStr(FileUp.PostedFile.ContentLength/1024)+"KB"
FName.Text = "已上傳文件名:"+FileUp.PostedFile.FileName+"<br>"+FName.Text

'寫入數據庫
on error resume next
dim myconn as sqlconnection
dim mycomm as sqlcommand
dim sql as string
dim id as integer
Dim image,anewimage As System.Drawing.Image
dim width,height,newwidth,newheight as integer
Dim callb As System.Drawing.Image.GetThumbnailImageAbort
myConn=New sqlconnection(ConfigurationSettings.AppSettings("數據庫"))
myconn.open()
sql="insert into picture (姓名,班級,介紹,屬性) values ('"&request.cookies("dgxyl").values("dgxylname")&"','"&request.cookies("dgxyl").values("dgxylbj")&"','"&trim(request("TextBox1"))&"','"&request("r1")&"')"
Mycomm=New sqlcommand(sql,myconn)
mycomm.executenonquery()
myconn.close()

Dim myCommand As New SqlCommand("select top 1 id from picture order by id desc", myConn)
myCommand.Connection.Open()
Dim myReader As SqlDataReader=mycommand.executereader()
if myReader.Read() then
id=myReader("id")
end if
myconn.close()
'保存圖片
FileUp.PostedFile.SaveAs( Server.MapPath("/classpic/")&cstr(id)&".jpg" )
'生成縮略圖
image=System.Drawing.Image.FromFile(Server.MapPath("/classpic/"+cstr(id)+".jpg"))
width=image.Width
height=image.height
if width>height then
newwidth=250
newheight=image.height/image.Width*newwidth
else
newheight=250
newwidth=image.Width/image.height*newheight
end if
response.write("id="+cstr(id)+"width="+cstr(Width)+";height="+cstr(height)+" ")
response.write("newwidth="+cstr(newwidth)+";newheight="+cstr(newheight)+"<br>")

aNewImage=image.GetThumbnailImage(newwidth,newheight,callb,new System.IntPtr())
aNewImage.Save(Server.MapPath("/smallpic/"+cstr(id)+".jpg"))
image.Dispose()


Dim FileSplit() As String = Split( FileUp.PostedFile.FileName, "/" )
Dim FileName As String = FileSplit(FileSplit.Length-1)
Dim Exts() As String = Split( FileName, "." )
Dim Ext As String = LCase(Exts(Exts.Length-1))

FDisplay.Text = "<A Target='_blank' HREF='/classpic/"&cstr(id)&".jpg"& "'>查看上傳文件</A>"
FDisplay1.text="<a href='/picture/default.asp?bj="&cstr(request.cookies("dgxyl").values("dgxylbj"))&"'>返回</a>"
End Sub
</script>
<SCRIPT language=JavaScript>
<!--
var requestsubmitted=false;
function guestbook_Validator(theForm)
{
//檢查是否從新提交
if (requestsubmitted==true){
alert("你已經提交了留言,請等待服務器應答!");
return(false);
}
requestsubmitted=true;

return (true);
}
//-->
</SCRIPT>
<Html>
<Body BgColor=White>
<H3 align="center">請正確填寫下面各項</h3>
<Hr></H3>
<Div id="FileInfo" Visible="False" runat="server">
<Asp:Label id="FSize" runat="server"/><br>
<Asp:Label id="FName" runat="server"/><br>
<Asp:Label id="FDisplay" runat="server"/>
<Asp:Label id="FDisplay1" runat="server"/>
</Div>
<Form Enctype="multipart/form-data" onsubmit="return guestbook_Validator(this)" runat="server">
上傳文件
<Input Type="File" id="FileUp" runat="server" size="20"><br>
圖片屬性:<input type="radio" value="<%=request.cookies("dgxyl").values("dgxylbj")%>" name="R1" checked>本班<input type="radio" value="全校" name="R1">全校(本班則只在本班顯示,全校則在全校顯示)<P>
圖片說明:<br>
<asp:TextBox id="TextBox1" runat="server" Width="233px" Height="141px">
</asp:TextBox>
<asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1" ErrorMessage="請輸入圖片說明">
</asp:RequiredFieldValidator><br>
<Asp:button id="Upload" OnClick="UploadFile" Text="上傳圖片" runat="server"/>
</form>
</Body>
</Html>
 

 
  1. 上一頁:
  2. 下一頁:
Copyright © 程式師世界 All Rights Reserved