'GB2312' is not a supported encoding name. For information on defining a custom encoding

在.net core3.1使用GB2312时抛出以下异常
System.ArgumentException:“’gb2312’ is not a supported encoding name. For information on defining a custom encoding, see the documentation for the Encoding.RegisterProvider method.

在NuGet 添加“System.Text.Encoding.CodePages”
在代码中还需要添加

Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

核心代码如下

static void Main(string[] args)
{
    Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
    byte[] bytes = Encoding.GetEncoding("gb2312").GetBytes("哈哈哈www.tnblog.net");
    string s = Encoding.GetEncoding("GB2312").GetString(bytes);
    Console.WriteLine("Hello tnblog");
}