Beginning C# 6.0 Programming with Visual Studio 2015 by Hammer Jacob Vibe & Reid Jon D

Author:Hammer, Jacob Vibe & Reid, Jon D. [Hammer, Jacob Vibe]
Language: eng
Format: azw3
ISBN: 9781119096559
Publisher: Wiley
Published: 2016-01-04T05:00:00+00:00

WARNING

The following example is for illustrative purposes only! In general, you should use dynamic types only when they are your only option — for example, when you are dealing with non-.NET objects.

TRY IT OUT

Using Dynamic Types: Ch13Ex06\Program.cs

Create a new console application called Ch13Ex06 and save it in the directory C:\BegVCSharp\Chapter13.

Modify the code in Program.cs as follows:using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using Microsoft.CSharp.RuntimeBinder; namespace Ch13Ex06 { class MyClass1 { public int Add(int var1, int var2) => var1 + var2; } class MyClass2 {} class Program { static int callCount = 0; static dynamic GetValue() { if (callCount++ == 0) { return new MyClass1(); } return new MyClass2(); } static void Main(string[] args) { try { dynamic firstResult = GetValue(); dynamic secondResult = GetValue(); WriteLine($"firstResult is: {firstResult.ToString()}"); WriteLine($"secondResult is: {secondResult.ToString()}"); WriteLine($"firstResult call: {firstResult.Add(2, 3)}"); WriteLine($"secondResult call: {secondResult.Add(2, 3)}"); } catch (RuntimeBinderException ex) { WriteLine(ex.Message); } ReadKey(); } } }

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