关于c＃：’csc’不被识别为内部或外部命令，可操作程序或批处理文件

'csc' is not recognized as an internal or external command, operable program or batch file

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我对C还比较陌生，我正在尝试使用cmd编译一个名为test.cs的hello world基本文件。它包含以下内容：

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// Similar to #include<foo.h> in C++, includes system namespaces in a program

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

// A name space declaration, a class is a group of namespaces
namespace Program1
{
class Hello // my class here, classes can contain multiple functions called methods which define it's behavior
{
static void Main(string[] args) // main method, just like in C/C++ it's the starting point for execution cycle
{
Console.WriteLine("Hello World");
Console.ReadKey(); // similar to _getch() in C++ waits for user to input something before closing
}
}
}

/*
* Other notes, .cs is a c# file extension
* cs files can be built via terminal by using csc foo.cs to generate foo.exe run it with foo
*/

当我尝试运行行csc test.cs时，我得到以下输出： img of issue