EverythingNet 
Check demo app
https://github.com/ju2pom/EverythingNetDemo
What
EverythingNet is a C# library that wraps the great library from voidtools named Everything. This library lets you search for files and folders incredibly fast. For more information jump to the official page
EverythingNet provides a simple .NET API that wraps aforementioned library (which is coded in C). It doesn't rely on Windows Search at all but on a specific service which is much faster and lighter.
EverythingNet exposes a fluent API that ease access to specific search functions.
Features
The fluent API provides the following set of features:
- [x] thread safety
- [x] search for files only or folders only or both
- [x] name contains/start with/end with
- [x] search by extension or list of extensions
- [x] logical operators (Not, And, Or)
- [x] size search criteria
- [x] picture properties search criteria (format, dimensions)
- [x] audio search criteria (ID3 Tags)
- [x] dates search criteria (creation, modification, access, execution)
- [ ] file content (maybe later)
How
The library exposes a fluent API that ease access to specific search functions. Here is a very simple example:
IEverything everything = new Everything();
var results = everything.Search().Name.Contains("temp");