Null or default comparison of generic argument in C#

by

To avoid boxing, the best way to compare generics for equality is with EqualityComparer<T>.Default. This respects IEquatable<T> (without boxing) as well as object.Equals, and handles all the Nullable<T> “lifted” nuances. Hence:

if(EqualityComparer<T>.Default.Equals(obj, default(T))) {
    return obj;
}

This will match:

  • null for classes
  • null (empty) for Nullable<T>
  • zero/false/etc for other structs

More Related Contents:

  1. How to capture value OOPS & Generic [closed]
  2. Create Generic method constraining T to an Enum
  3. Why can’t the C# constructor infer type?
  4. Can’t operator == be applied to generic types in C#?
  5. Nullable type as a generic parameter possible?
  6. Generic constraint to match numeric types [duplicate]
  7. Generic Method Executed with a runtime type [duplicate]
  8. Is it worthwhile to initialize the collection size of a List if it’s size reasonably known?
  9. Generics – where T is a number? [duplicate]
  10. A reusable pattern to convert event into task
  11. Sorting an IList in C#
  12. c# compare two generic values [duplicate]
  13. Accessing a property of derived class from the base class in C#
  14. How do I create a generic class from a string in C#? [duplicate]
  15. Get all types implementing specific open generic type
  16. Parse string to enum type
  17. Why does this generic constraint compile when it seems to have a circular reference
  18. Calling generic method with Type variable [duplicate]
  19. Case insensitive access for generic dictionary
  20. Ambiguous call between two C# extension generic methods one where T:class and other where T:struct
  21. How do I tell if a type is a “simple” type? i.e. holds a single value
  22. How to define generic type limit to primitive types?
  23. Entity Framework – how do I get the columns?
  24. Correct way to check if a type is Nullable [duplicate]
  25. The given key was not present in the dictionary. Which key?
  26. Checking type parameter of a generic method in C#
  27. Can you use “where” to require an attribute in c#?
  28. Get derived class type from a base’s class static method
  29. C# List: why you cannot do `List foo = new List();`
  30. How to use Activator to create an instance of a generic Type and casting it back to that type?

Leave a Comment