Dynamically adding .EndsWith() from combobox

user_1445985 0
Viewed 84

I have a combo box called comboFileTypes. Inside that is a drop down list containing:

MP4
MOV
MKV
VOB

And after a button press I have the following code to scan a directory for files:

var files = Directory
    .EnumerateFiles(sourceDIR.Text, "*.*", SearchOption.AllDirectories)
    .Where(s => 
        s.EndsWith(".mp4") || 
        s.EndsWith(".mov") || 
        s.EndsWith(".vob") ||
        s.EndsWith(".MP4") || 
        s.EndsWith(".MOV") || 
        s.EndsWith(".VOB"));

Which is hardcoded. I want the WHERE option to be dynamically generated from the combobox instead, so that the user can add another type of file if they need to. (Also case insensitive, if that's possible, otherwise I'll just add both cases)

Any help would be appreciated.

winforms c#
5 Answers

You can get values from ComboBox by 

var values = comboFileTypes.Items.Cast<string>()

and use it in like this:

var files = Directory
    .EnumerateFiles(sourceDIR.Text, "*.*", SearchOption.AllDirectories)
    .Where(s => values.Any(v => s.EndsWith(v, StringComparison.OrdinalIgnorecase));
user_109212860

Well, maybe I'm missing something big, but...

void onOpen()
{
    var selected = comobFileTypes.SelectedItem;

    if ( selected != null ) {
        string ext = "." + selected.ToString();

        var files = Directory.EnumerateFiles(sourceDIR.Text, "*.*", SearchOption.AllDirectories).Where(
                s => s.EndsWith( ext );

        // ...more things...
    }

    return;
}

The key here is that ComboBox has a SelectedItem property, which can be null if nothing is selected, or hold the selected option.

If you want to select all the extensions, then you can use the Items property.

void onOpen()
{
    string[] items = new string[ comboFileTypes.Items.Length ];

    foreach(int i = 0; i < items.Length; ++i) {
        items[ i ] = "." + comboFileTypes.Items[ i ].ToString();
    }

    var files = new List<string>();
    var allFiles = Directory.EnumerateFiles( sourceDIR.Text, "*.*", SearchOption.AllDirectories );

    foreach(string ext in items) {
        files.AddRange( allFiles.Where( s => s.EndsWith( ext ) );
    }

    // ...more things... with files...
    return;
}

Hope this helps.

user_2669780

Get all extensions from combobox:

 var extensions = comboFileTypes.Items.Cast<string>().Select(x => "." + x);

Search ignoring case by enumerating all files in directory:

var files = Directory.EnumerateFiles(sourceDIR.Text, "*.*", SearchOption.AllDirectories).Where(x => extensions.Any(y => y.Equals(Path.GetExtension(x), StringComparison.OrdinalIgnoreCase)));

As alternative you could search for specified extensions only:

 var files = extensions.AsParallel().SelectMany(x => Directory.EnumerateFiles(sourceDIR.Text, "*" + x, SearchOption.AllDirectories));
user_6414260

try this code:

List<string> items = new List<string>();
for (int i = 0; i < comboBox1.Items.Count; i++)
{
    items.Add(comboBox1.Items[i].ToString().ToLower());
}

var files = Directory
        .EnumerateFiles(sourceDIR.Text, "*.*", SearchOption.AllDirectories)
        .Where(file => items.Any(item => file.ToLower().EndsWith(item)));
user_44964290

another possibility, would be to use the search pattern. Unfortunately it is not possible to search for multiple patterns at once. But you could use SelectMany to scan through the pattern list and flatten the search results into a single list:

var allPatterns = comboFileTypes.Items.Cast<string>();
allPatterns.SelectMany(pattern => Directory.EnumerateFiles(@"F:\temp", $"*.{pattern}", SearchOption.AllDirectories));

The filenames will be ordered as the pattern list

user_51744690
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