What are the lists of static classes in .NET?

The .NET framework includes several static classes that provide utility methods, constants, and services for various purposes. Here are some notable static classes in .NET:

1. System.Math:

   • Provides static methods for common mathematical operations, such as trigonometric, logarithmic, and rounding functions.

2. System.Console:

   • Provides static methods for console input and output operations, such as reading from or writing to the console.

3. System.String:

   • Although String is a class, it has many static methods for string manipulation, such as String.Concat, String.Format, and String.Join.

4. System.DateTime:

   • Provides static methods and properties for working with dates and times, such as DateTime.Now, DateTime.Today, and various parsing and formatting methods.

5. System.IO.File:

   • Provides static methods for working with files, such as reading, writing, and manipulating file attributes.

6. System.IO.Directory:

   • Provides static methods for working with directories, such as creating, moving, and deleting directories.

7. System.Convert:

   • Provides static methods to convert base data types to other base data types, such as converting a string to an integer.

8. System.Environment:

   • Provides information about and control over the current environment and platform, including methods to retrieve environment variable values.

9. System.Diagnostics.Debug:

   • Provides static methods for interacting with the debugging and tracing features of the .NET runtime.

10. System.Diagnostics.Trace:

    • Provides static methods for emitting trace messages from applications.

11. System.Threading.Thread:

    • Provides static methods for working with threads, such as creating and controlling thread execution.

12. System.Collections.Generic.List<T>:

    • While List<T> is primarily a generic class, it has many static methods, such as List<T>.Sort and List<T>.ForEach, that operate on instances of the List<T> class.

13. System.Collections.Generic.Dictionary<TKey, TValue>:

    • Similar to List<T>, Dictionary<TKey, TValue> is a generic class, but it includes static methods like Dictionary<TKey, TValue>.TryGetValue for dictionary-related operations.

These are just a few examples, and the .NET framework includes many more static classes that cover a wide range of functionalities. When working with .NET, it's helpful to explore the available classes in the relevant namespaces to discover the utility methods and services provided by static classes. Additionally, many third-party libraries and frameworks may introduce their own static classes for specific purposes.