Recently learning to upload files part of the content, including the creation of folders, set folder properties, upload files and save.
Front Code:
<HTML xmlns="http://www.w3.org/1999/xhtml">
<head runat="Server">
<meta http-equiv= "content-type" content= "text/html; Charset=utf-8 " />
< title></title>
</head> <body>
<form runat= "server" id= "Form1" method= "post" enctype= "Multipart/form-data" >
&NBSP; < Input name= "F" type=< Span class= "Attribute-value" > "file" />
<input name="s" type="Submit" />
</form>
</body>
</html>
Background code:
System.Web.HttpFileCollection _file = System.Web.HttpContext.Current.Request.Files;
if (_file. Count > 0)
{
File size
Long size = _file[0]. ContentLength;
File type
String type = _file[0]. ContentType;
Filename
String name = _file[0]. FileName;
File format
String _tp = System.IO.Path.GetExtension (name);
if (_TP. ToLower () = = ". jpg" | | _tp. ToLower () = = ". jpeg" | | _tp. ToLower () = = ". gif" | | _tp. ToLower () = = ". png" | | _tp. ToLower () = = ". swf")
{
Get file stream
System.IO.Stream Stream = _file[0]. InputStream;
Save File
String savename = DateTime.Now.ToString ("YYYYMMDDHHMMSS") + _tp;
String path = Server.MapPath ("") + "/upload/area/" + savename;
_file[0]. SaveAs (path);
}
}
Later thought, how to determine whether the folder exists? If it does not exist, the direct save will be wrong, or already exist, will not overwrite it?
Use the following method to determine if there is a non-existent create
if (! Directory.Exists (spath))
{
Directory.CreateDirectory (spath);
}
The folder was later created, or the path error was reported, the reason conjecture: 1, not included in the project. 2, no permissions.
Workaround:
1, it is possible to manually include it in the project, it can be solved, but very uncomfortable, because the program runs on the server, you can not create a folder, and then manually to add him into the project.
2, the online search is created by the folder is read-only properties, but I manually put the program created by the folder properties read-only removed, or unsuccessful, but use the following code to remove the folder Properties "read-only", the upload succeeded.
Remove read-only properties for folder: System.IO.DirectoryInfo dirinfo = new DirectoryInfo ("filepath");
Dirinfo.attributes = Fileattributes.normal & fileattributes.directory;
Remove read-only properties of the file: System.IO.File.SetAttributes ("filepath", System.IO.FileAttributes.Normal);
After that, the new folder part of the code was re-organized into:
String _tp = System.IO.Path.GetExtension (name);
if (_TP. ToLower () = = ". jpg" | | _tp. ToLower () = = ". jpeg" | | _tp. ToLower () = = ". gif" | | _tp. ToLower () = = ". png" | | _tp. ToLower () = = ". swf")
{
String savename = DateTime.Now.ToString ("YYYYMMDDHHMMSS") + _tp;
string file = "/" + DateTime.Now.ToString ("yyyyMMdd") + "/";
String path = Server.MapPath ("~") +file;
if (! Directory.Exists (PATH))
{
Directory.CreateDirectory (path);
DirectoryInfo dirinfo = new DirectoryInfo (path);
Dirinfo.attributes = fileattributes.normal&fileattributes.directory;
}
_file[0]. SaveAs (Path+savename);
Viewbag.imgpath = file + savename;//can be saved to a database or XML and other places, I am here to test, directly back to the front desk
}
HTML plus C # uploading files
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