C#通過文件頭判斷flv文件

代碼如下： 

private void button1_Click(object sender, EventArgs e)
{
    string path = Application.StartupPath + "\\test.flv";

    //3byte 總是FLV（0x46 0x4C 0x56）
    byte[] Type = new byte[3];
    using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))
    {
        fs.Read(Type, 0, Type.Length);
    }

    String content = Encoding.ASCII.GetString(Type, 0, Type.Length);

}

FLV格式參考：https://www.cnblogs.com/lidabo/p/9018548.html