Get files from directory with pattern [duplicate]

Answer 1

If you're using .NET 4.0, I'd go with Directory.EnumerateFiles:

var files = from f in Directory.EnumerateFiles("C:\\")
            where f.EndsWith(".c") || f.EndsWith(".h")
            select f;

Answer 2

For .Net 3.5.

public IEnumerable<string> GetFiles(
     string basePath, 
     params string[] searchPatterns)
{
    if (searchPatterns == null || searchPatterns.Length == 0)
    {
        return Directory.GetFiles(basePath);
    }

    return Enumerable.SelectMany(searchPatterns, 
                         p => Directory.GetFiles(basePath, p));
}

Usage:

GetFiles(@"c:\", "*.c", "*.h");

you probably want to add some validation

Answer 3

Here's some useful helper functions to simulate having multiple filters:

// .NET 4.0 friendly
public static IEnumerable<string> EnumerateFiles(string path, params string[] filters)
{
    return filters.Length == 0
        ? Directory.EnumerateFiles(path)
        : filters.SelectMany(filter => Directory.EnumerateFiles(path, filter));
}

// .NET 3.5 friendly
public static IEnumerable<string> GetFiles(string path, params string[] filters)
{
    return filters.Length == 0
        ? Directory.GetFiles(path)
        : filters.SelectMany(filter => Directory.GetFiles(path, filter));
}

Answer 4

you can try something like this:

 var query = from p in Directory.GetFiles(@"C:\").AsEnumerable()
                    where p.Contains(".c")
                    || p.Contains(".h")
                    select p;

Answer 5

its not possible to specify multiple filters in single GetFiles() method call. You can find alternatives here

Answer 6

See How to get files with multiple extensions using extension methods.