How to set filter for FileSystemWatcher for multiple file types?

user_661933 0
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Everywhere I find these two lines of code used to set filter for file system watcher in samples provided..

FileSystemWatcher watcher = new FileSystemWatcher();
watcher.Filter = "*.txt";
//or
watcher.Filter = "*.*";

But I want my watcher to monitor more file types, but not all. How can I achieve this:

//watcher.Filter = "*.txt" | "*.doc" | "*.docx" | "*.xls" | "*.xlsx";

I tried these:

 watcher.Filter = "*.txt|*.doc|*.docx|*.xls|*.xlsx"; 
 // and
 watcher.Filter = "*.txt;*.doc;*.docx;*.xls;*.xlsx*";

Both did not work. This is just basics but I miss it. Thanks..

filesystemwatcher .net c#
6 Answers

Since .Net Core 3.x and .Net 5 Preview you can simply add multiple filters to the Filters collection.

var watcher = new FileSystemWatcher();
watcher.Path = "/your/path";
watcher.Filters.Add("*.yml");
watcher.Filters.Add("*.yaml");
watcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName;
watcher.EnableRaisingEvents = true;

Alternatively if you like object initializers,

var watcher = new FileSystemWatcher
    {
        Path = "/your/path",
        Filters = {"*.yml", "*.yaml"},
        NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName,
        EnableRaisingEvents = true,
    };
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