C#

Predicate   is the delegate like   Func   and   Action   delegates. It represents a method containing a set of criteria and checks whether the passed parameter meets those criteria. A predicate delegate methods must take one input parameter and return a boolean - true or false. The  Predicate  delegate is defined in the  System  namespace, as shown below: Predicate signature:  public   delegate   bool   Predicate < in  T>(T obj); Same as other delegate types,  Predicate  can also be used with any method, anonymous method, or lambda expression. Example: Predicate delegate static bool IsUpperCase( string str) { return str.Equals(str.ToUpper()); } static void Main( string [] args) { Predicate < string > isUpper = IsUpperCase; bool result = isUpper( "hello world!!" ); Console .WriteLine(result); } Try it Output: false An anonymous method can also be assigned to a Predicate d...