1 Answers
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);
}
Output:
false