在运行时获取当前的.NET CLR版本？

using System;
using System.Reflection;

class Program
{
    static void Main()
    {
        Assembly assembly = Assembly.GetExecutingAssembly();
        AssemblyName assemblyName = assembly.GetName();
        Version version = assemblyName.Version;

        Console.WriteLine("当前的 .NET CLR 版本为：" + version);
    }
}