How do get the first occurrence of a char in Substring

Question

I'm trying to get the first occurrence in my substring start point:

string dir = Request.MapPath(Request.ApplicationPath) + "\\App_GlobalResources\\";

foreach (var file in Directory.EnumerateFiles(dir, "*.resx"))
{
    ddlResources.Items.Add(new ListItem { Text = file.Substring(firstoccuranceof("."), file.LastIndexOf(".")), Value = file });
}

if I do file.Substring(file.IndexOf("."), file.LastIndexOf(".")) I get an error

Answer 1

To answer your actual question - you can use string.IndexOf to get the first occurrence of a character. Note that you'll need to subtract this value from your LastIndexOf call, since Substring's second parameter is the number of characters to fetch, not a start and end index.

However... Instead of parsing the names, you can just use Path.GetFilenameWithoutExtension to get the filename directly.

Answer 2

First occurence

String.IndexOf('.')

Last occurence

String.LastIndexOf('.')