var type relies on the C# compiler to figure out the type, while dynamic type depends on the runtime to infer the type.
Compare the following code.
using System;
class Test
{
static void Main()
{
var i = 5;
i = "rntsoft.com";
}
}
Compile time error:
C:\g>csc Program.cs
Microsoft (R) Visual C# 2010 Compiler version 4.0.30319.1
Copyright (C) Microsoft Corporation. All rights reserved.
Program.cs(8,13): error CS0029: Cannot implicitly convert type 'string' to 'int'
using System;
class Test
{
static void Main()
{
dynamic i = 5;
Console.WriteLine(i.GetType());
i = "rntsoft.com";
Console.WriteLine(i);
Console.WriteLine(i.GetType());
}
}
The output:
System.Int32
rntsoft.com
System.String