NullableTypes examples

2019-01-06 14:44:58 +01:00
parent ba2e475f5b
commit 81833c686b
5 changed files with 151 additions and 0 deletions
--- a/Nullable_types/Program.cs
+++ b/Nullable_types/Program.cs
@ -0,0 +1,50 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Nullable_types
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            //DateTime date = null; //datetime is nott nullable
+
+            Nullable<DateTime> ndate = null;
+            DateTime? nullable_date = null;
+
+            /*
+            Console.WriteLine("GetValueOrDefault(): " + nullable_date.GetValueOrDefault());
+            Console.WriteLine("HasValue: " + nullable_date.HasValue);
+            Console.WriteLine("Value: " + nullable_date.Value);
+            */
+            nullable_date = new DateTime(2014, 1, 1);
+            //DateTime date2 = nullable_date;
+            DateTime date2 = nullable_date.GetValueOrDefault();
+            DateTime? date3 = date2;
+
+            Console.WriteLine(date2);
+            Console.WriteLine(date3.GetValueOrDefault());
+
+            DateTime date4;
+
+            //Method 1
+            if (nullable_date != null)
+                date4 = nullable_date.GetValueOrDefault();
+            else
+                date4 = DateTime.Today;
+            Console.WriteLine(date4);
+            //Method 2
+
+            DateTime date5 = nullable_date ?? DateTime.Today;
+            Console.WriteLine(date5);
+
+            DateTime date6 = (nullable_date != null) ? nullable_date.GetValueOrDefault() : DateTime.Today;
+            Console.WriteLine(date6);
+
+        }
+    }
+}
+