EN CSharp Keyword var

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C#: var

Handbook C# · Practical Guide

Asks the compiler to infer the static type of a local variable from its initializer. This is not dynamic.

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
var count = 3;
System.Console.WriteLine(count.GetType().Name);

Result:

Int32

Syntax

var 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)
    {
        var number = 12;
        var name = "ore";
        Console.WriteLine($"{number.GetType().Name}:{name.GetType().Name}");
    }
}

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)
    {
        var item = new { Name = "ore", Count = 3 };
        var list = new List<int> { 1, 2, 3 };
        Console.WriteLine($"{item.Name}:{list.Sum()}");
    }
}

Official source: Microsoft Learn.