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I'm trying to upload a file and change its name below. I need to get the file extension. The code below has a underline under "Path" am I missing a using statement? Or what is the correct syntax for what I'm doing?
if (FileUpload1.HasFile)
try
{
var FileExtension = Path.GetExtension(FileUpload1.PostedFile.FileName).Substring(1);
var newName = DateTime.Now.ToLongDateString();
//Map path to folder
string realpath = Server.MapPath("Pictures\\") + Guid.NewGuid() + FileExtension;
FileUpload1.SaveAs(realpath);
Label1.Text = "File name: " +
FileUpload1.PostedFile.FileName + "<br>" +
FileUpload1.PostedFile.ContentLength + " kb<br>" +
"Content type: " +
FileUpload1.PostedFile.ContentType;
}
catch (Exception ex)
{
//Handle the error
throw ex;
}
else
{
Label1.Text = "You have not specified a file.";
}
437
There are a few different ways to extract the extension from a filename with PHP, which is given below: Using pathinfo() function: This function returns information about a file. If the second optional parameter is omitted, an associative array containing dirname, basename, extension, and the filename will be returned.
To get a filename extension, you can use a combination of split() and pop() methods. The split() method will convert a string into an array of substrings, separated by the character you passed as the method's parameter. And that's how you can get the file extension from a filename.
Right-click the file. Select the Properties option. In the Properties window, similar to what is shown below, see the Type of file entry, which is the file type and extension.
FileInfo fi = new FileInfo(fileName);
string ext = fi.Extension;
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