Checking file type

[Guest]

Hello,

I 'm using drag-n-drop and if the user drops a file, I want to make sure
that it is either an Excel file or a plain text file.

Is the right way to do this to check that the last three chars of the file
name are either xls or txt, or is there another way?

Thanks,
-Flack

 

[Mythran]

Hello,

I 'm using drag-n-drop and if the user drops a file, I want to make sure
that it is either an Excel file or a plain text file.

Is the right way to do this to check that the last three chars of the file
name are either xls or txt, or is there another way?

Thanks,
-Flack

I would check the extension, rather than the last three chars of the
filename:

IE:

using System.IO;

namespace MyNamespace
{
public class Class1
{
public bool IsTextFile(string FileName)
{
string ext = Path.GetExtension(FileName).ToLower();
return (ext == ".txt" || ext == ".csv");
}

public bool IsExcelFile(string FIleName)
{
string ext = Path.GetExtension(FileName).ToLower();
// Add the rest of the excel file extensions you want to the
list below.
return (ext == ".xls" || ".xlt" || ".xla" || ".xlm");
}
}
}

HTH,
Mythran