Question

I have a folder with files named

1. myfileone
2. myfiletwo
3. myfilethree

How can I check if file “myfilethree” is present.

I mean is there another method other than IsFileExist() method, i.e like filename contains substring “three”?

Answer 1

Substring:

bool contains  = Directory.EnumerateFiles(path).Any(f => f.Contains("three"));

Case-insensitive substring:

bool contains  = Directory.EnumerateFiles(path).Any(f => f.IndexOf("three", StringComparison.OrdinalIgnoreCase) > 0);

Case-insensitive comparison:

bool contains  = Directory.EnumerateFiles(path).Any(f => String.Equals(f, "myfilethree", StringComparison.OrdinalIgnoreCase));

Get file names matching a wildcard criteria:

IEnumerable<string> files = Directory.EnumerateFiles(path, "three*.*"); // lazy file system lookup

string[] files = Directory.GetFiles(path, "three*.*"); // not lazy