DateTime - In
A T extension method to determines whether the object is equal to any of the provided values.
public static void Main() { DateTime date = new DateTime(2018, 12, 25); DateTime [] values = {new DateTime(2018, 12, 25), new DateTime(2019, 2, 28), new DateTime(2019, 2, 24), new DateTime(2017, 5, 12)}; // C# Extension Method: DateTime - In if(date.In(values)) { Console.WriteLine("{0} exists in the list.", date); } else { Console.WriteLine("{0} doesn't exists in the list.", date); } }
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using System; public static partial class Extensions { /// <summary> /// A T extension method to determines whether the object is equal to any of the provided values. /// </summary> /// <param name="this">The object to be compared.</param> /// <param name="values">The value list to compare with the object.</param> /// <returns>true if the values list contains the object, else false.</returns> /// ### /// <typeparam name="T">Generic type parameter.</typeparam> public static bool In(this DateTime @this, params DateTime[] values) { return Array.IndexOf(values, @this) != -1; } }