Thursday, 20 March 2014

what is the difference between using exists over contains

1.       Exists is not the linq standard; Exist is there from 2.0;
2.       Just as IndexOf, Contains search strings. It checks if one of the substring is contained in another.
3.       Exists returns whether any of the List elements found. You can use a loop and if-statement also;
4.       The difference is only  Contains support by Linq parametrs to Entities, Exists does not supported
5.       How to use Exists in c#

class Program
    {
        static void Main(string[] args)
        {
            List<int> list = new List<int> { 1, 2, 3, 4 };
            // See if any elements equal to 3
            bool exists = list.Exists(element => element == 3); // True
            Console.WriteLine(exists);
            // Check for numbers eqal to 5
            exists = list.Exists(element => element == 5); // False
            Console.WriteLine(exists);
        }
    }

6.       How to Use Contain in c#
class Program
    {
        static void Main(string[] args)
        {
            string s1 = "Check for the contains method in C#";
            string s2 = "contains"; // Contains is case sensetive
            bool bln;
            bln = s1.Contains(s2);
            Console.WriteLine("string, s2, in string, s1?: {0}", bln); //bln =true
        }
    }

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