EN CSharp Keyword dynamic

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C#: dynamic

Handbook C# · Practical Guide

Defers binding of supported operations until runtime. Accessing a missing member fails when that operation executes.

Simple example (Example.cs)

Save this example separately as Example.cs. Run it independently of the other examples on this page.

Example.cs:

// PROJECT-EXAMPLE
dynamic text = "ore";
System.Console.WriteLine(text.ToUpperInvariant());

Result:

ORE

Syntax

dynamic value = expression;

Example 1: simple form

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        dynamic value = "ore";
        Console.WriteLine(value.ToUpperInvariant());
    }
}

Example 2: another practical form

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        dynamic value = new System.Dynamic.ExpandoObject();
        value.Name = "wood"; value.Count = 4;
        Console.WriteLine($"{value.Name}:{value.Count}");
    }
}

Official source: Microsoft Learn.