An upload source code for ASP. NET image uploads >>>>>
Code 1:
If (this. fudsc. hasfile) // check whether a file exists
{
String fullfilename = This. fudsc. postedfile. filename; // file path name
String filename = fullfilename. substring (fullfilename. lastindexof ("//") + 1); // image name
String type = fullfilename. substring (fullfilename. lastindexof (".") + 1); // image format
If (type = "jpg" | type = "jpg" | type = "GIF" | type = "GIF" | type = "BMP" | type = "BMP ") // determine whether the image is of the image type
{
If (this. fudsc. postedfile. contentlength> 20*1024)
{
Response. Write ("<SCRIPT> alert ('upload image must be less than 20 KB! '); </SCRIPT> ");
}
Else
{
String Path = httpcontext. Current. Request. mappath ("~ /ZP/"); // obtain the path of the uploaded file's website directory
This. fudsc. saveas (path + filename); // store the file to the disk
Response. Write ("<SCRIPT> alert ('image uploaded successfully! '); </SCRIPT> "); // prompt
This. imgpicture. src = "~ /ZP/"+ filename; // display image
}
}
Else
{
Response. Write ("<SCRIPT> alert ('non-image type, not allowed to upload! '); </SCRIPT> ");
}
}
Else
{
Response. Write ("<SCRIPT> alert ('file must be specified! '); </SCRIPT> ");
}
Code 2:
Step 1:
Client >>>>
Figure: <input type = "text" id = "imgurl" name = "imgurl" onpropertychange = "onpropertychange_click (this, 'btnview '); "/> <input type =" button "id =" Upload "value =" Upload "onclick =" doupload (this, 'imgurl ',''); "/> <input type =" button "id =" btnview "name =" btnview "value =" preview "style = 'display: none; 'onclick = 'previewpic (this, 'imgurl', ''); '/>
The referenced JS script functions are as follows:
Function _ (OBJ ){
Return document. getelementbyid (OBJ );
}
Function onpropertychange_click (OBJ, btnview ){
If (typeof (btnview) = 'string ')
Btnview = _ (btnview );
If (typeof (OBJ) = 'string ')
OBJ = _ (OBJ );
If (btnview ){
If (obj. value! = ""){
If (btnview. style. Display = "NONE "){
Btnview. style. Display = '';
}
} Else {
If (btnview. style. Display = ""){
Btnview. style. Display = "NONE ";
}
}
}
}
Function doupload (OBJ, imgurl, Param ){
VaR url = "/accessories/useruploadfile/" + Param;
If (document. All ){
Showmodelessdialog (URL, window, "Help: No; Status: No; dialogwidth: 300px; dialogheight: 80px ;");}
Else {window. Open (URL );
}
}
Function previewpic (selfobj, imgobj, title ){
If (typeof (imgobj) = "string ")
Imgobj = _ (imgobj );
If (! Imgobj ){
Alert ("the image object control is invalid! ");
Return;
}
Imgurl = imgobj. value;
If (imgurl = NULL | imgurl = ""){
Alert ("invalid image address! ");
Return;
} If (imgurl. lastindexof (".") =-1 ){
Alert ("the image has no suffix! ");
Return;
}
VaR suffix = imgurl. substring (imgurl. lastindexof ("."). tolowercase (). Split (".") [1];
VaR mediacontainer = NULL;
If (suffix = "SWF "){
Mediacontainer = flash (window. Screen. Width, window. Screen. Height, imgurl, false );
} Else if (suffix = "GIF" | suffix = "jpg" | suffix = "Jpeg" | suffix = "BMP" | suffix =" PNG ") {
Mediacontainer = " ";
} Else {
Alert ("the address format is incorrect. The current supported formats are:/R/n SWF | GIF | JPG | jpe | JPEG | BMP | PNG"); return;
}
If (Title = NULL | Title = "")
Title = "image preview ";
VaR htmlstr = "<HTML>
VaR W = Window. open ();
Using Doc ument. Write (htmlstr );
Using Doc ument. Close ();
W. Focus ();
}
Function flash (W, H, Uri, istransparent ){
VaR transparent = "<Param name = 'wmode' value = 'transparent'/> ";
If (! Istransparent)
Transparent = '';
VaR F = "<object classid =/" CLSID: d27cdb6e-ae6d-11cf-96b8-444553540000 /"";
F + = "codebase =/" http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=5,0,0,0 "";
F + = "width =/" "+ W +"/"Height =/" "+ H +"/"align =/" middle/"viewastext> ";
F + = "<Param name =/" allowScriptAccess/"value =/" samedomain/"/> ";
F + = "<Param name =/" movie/"value =/" "+ URI +"/"/> ";
F + = "<Param name =/" menu/"value =/" false/"/> ";
F + = "<Param name =/" Quality/"value =/" autohigh/"/> ";
F + = "<Param name =/" bgcolor/"value =/" # ffffff/"/>" + transparent;
F + = "<embed src =/" "+ URI +"/"menu =/" false/"Quality =/" autohigh/"width =/" "+ W +" /"Height =/" "+ H + "/"";
F + = "align =/" middle/"allowScriptAccess =/" samedomain/"type =/" application/X-Shockwave-flash /"";
F + = "pluginspage =/" http://www.macromedia.com/go/getflashplayer/ "/> </Object> ";
Return (f );
}
Step 2:
Source code of the server upload page >>>>
<HTML>
<Head>
<Title>
<% = (O. username) %>
File Upload </title>
<Base target = "_ Self">
<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312">
<Style type = "text/CSS">
Body {padding-Right: 0px; padding-left: 0px; font-size: 12px; padding-bottom: 0px; SCROLLBAR-HIGHLIGHT-COLOR: #808080; SCROLLBAR-SHADOW-COLOR: #808080; SCROLLBAR-3DLIGHT-COLOR: # d4d0c8; SCROLLBAR-ARROW-COLOR: #000000; padding-top: 0px; SCROLLBAR-TRACK-COLOR: # d4d0c8; SCROLLBAR-DARKSHADOW-COLOR: # d4d0c8; SCROLLBAR-BASE-COLOR: # d4d0c8; Background-color: # d4d0c8; text-align: center; magin: 0}
</Style>
<Script language = "JavaScript" src = "/JS/utility. js">
</SCRIPT>
<Meta name = "generator" content = "Microsoft Visual Studio. NET 7.1">
<Meta name = "code_language" content = "C #">
<Meta name = "vs_defaultclientscript" content = "JavaScript">
<Meta name = "vs_targetschema" content = "http://schemas.microsoft.com/intellisense/ie5">
<SCRIPT type = "text/JavaScript" Language = "JavaScript">
<! --
Function fngetinfo (){
VaR S = dialogarguments;
S. inputvalue = _ ("file1"). value;
S. fileupdate ();
}
-->
</SCRIPT>
</Head>
<Body ms_positioning = "gridlayout">
<Form ID = "form1" method = "Post" runat = "server">
<Br/>
<Div> select image: <input type = "file" name = "file1" id = "file1" runat = "server" size = "10"/>
<Asp: button id = "btnsubmit" runat = "server" text = "Upload"/> </div>
</Form>
</Body>
</Html>
Hide. CS files
Private void btnsubmit_click (Object sender, eventargs E)
{
If (this. file1.postedfile! = NULL)
{
String filename = This. file1.postedfile. filename. Trim ();
If (filename = "")
Return;
String resulturl;
String filetype = This. file1.postedfile. contenttype. Trim (). tolower ();
Int filesize = This. file1.postedfile. contentlength;
String clientpath = utility. getserverpath (O. userid, filename, filetype, out resulturl, null );
If (clientpath! = "")
{
This. file1.postedfile. saveas (utility. getserverpath (O. userid, filename, filetype, out resulturl, null ));
Window. doshowmodelessdialog (resulturl, "imgurl", true );
}
Else {
Window. Close ("the format of the file you uploaded is invalid. The correct format is SwF | GIF | BMP | JPEG | jpe | PNG ");
}
}
}
# Region: Obtain the client Control ID. The default value is imgurl.
Private string getclientcontrolid ()
{
String url = utility. url;
If (url = NULL | url = "")
Return "imgurl ";
If (URL. indexof ("? ") =-1)
Return "imgurl ";
Url = URL. Split (New char [] {'? '}) [1];
Return (url = "")? "Imgurl": URL. Trim ();
}
# Endregion
}
Corresponding class. CS
Public static void doshowmodelessdialog (string svalue, string textboxid, bool isclosecurrentpage)
{
String JS = @"
Function doshowmodelessdialog (svalue, textboxid ){
VaR imgurl = nvidialogarguments.doc ument. getelementbyid (textboxid );
If (typeof (imgurl) = 'object '){
Imgurl. value = svalue;
}
}";
JS + = "doshowmodelessdialog ('" + svalue + "', '" + textboxid + "');";
If (isclosecurerepage)
JS + = "window. Opener = NULL; window. Close ();";
Utility. Terminate (RegEx. Replace (JavaScript, "([// $] {1})", JS ));
}
}
}
Public static void terminate (string description)
{
Httpcontext. Current. response. Write (description );
Httpcontext. Current. response. End ();
}
# Region File Upload-obtain the physical path of the server
Public static string getserverpath (INT userid, string posted_filename, string posted_filetype, out string resulturl, string realfilename)
{
Resulturl = NULL;
If (posted_filename = NULL)
Return "";
If (posted_filename.lastindexof (".") =-1)
Return "";
If (posted_filename.indexof ("//") =-1)
Return "";
If (posted_filename.length <8)
Return "";
If (posted_filename.substring (1, 2 )! = "://")
Return "";
String [] arr = posted_filename.split (New char [] {'//'});
String filename = arr [arr. getupperbound (0)]. Trim (). tolower ();
String suffix = filename. Split (New char [] {'.'}) [1];
If (
Suffix = "SWF" |
Suffix = "GIF" |
Suffix = "jpg" |
Suffix = "BMP" |
Suffix = "Jpeg" |
Suffix = "jpe ")
{
Resulturl = "/uploadfiles /";
String filepath = system. Web. httpcontext. Current. server. mappath (resulturl );
Utility. createdirectory (filepath );
Filepath + = userid + "//";
Utility. createdirectory (filepath );
String filetype = "Images ";
If (suffix = "SWF ")
{
Filetype = "flashs ";
}
Filepath + = filetype + "//";
Utility. createdirectory (filepath );
If (realfilename! = NULL)
{
// If the source name of the uploaded file is not blank, use the source file name, which is generally used for batch upload.
Filepath + = realfilename;
Resulturl + = userid + "/" + filetype + "/" + realfilename;
Return filepath;
}
Else
{
String name = system. datetime. Now. ticks. tostring ();
Filepath + = Name + "." + suffix;
Resulturl + = userid + "/" + filetype + "/" + name + "." + suffix;
Return filepath;
}
}
Else
{
Return "";
}
}
# Endregion
# Region file directory-createdirectory
Public static void createdirectory (string folder)
{
If (Folder. indexof (":") =-1)
Folder = system. Web. httpcontext. Current. server. mappath (folder );
Try
{
If (! System. Io. Directory. exists (folder ))
{
System. Io. directoryinfo dir = system. Io. Directory. createdirectory (folder );
Dir = NULL;
}
}
Catch (exception ex)
{
Utility. Terminate ("Folder creation exception:" + ex. tostring ());
}
}
# Endregion
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