看到论坛讨论帖：（https://www.52pojie.cn/thread-1879511-1-1.html），有了这篇注册机分析与注册机。
分析过程
从原帖可知Net程序，有混淆。
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直接de4处理并找到注册验证：
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[C#] 纯文本查看 复制代码 private void method_0(object sender, EventArgs e)
{
ProjectData.ClearProjectError();
if (Class18.bool_16)
{
base.Close();
}
else if (Strings.Len(Class15.string_1) == 0)
{
Interaction.MsgBox("机器码不能为空，如不能解决，请与南方联系。", MsgBoxStyle.OkOnly, null);
}
else
{
Conversions.ToString(Class1.smethod_0().Registry.GetValue("HKEY_CURRENT_USER\Software\NanfangSoft .net\ProName730", "PCNB", ""));
string text = Strings.Trim(this.vmethod_2().Text);
string text2 = Strings.Trim(this.vmethod_6().Text);
if ((text2.Length 15)) //长度15位
{
this.vmethod_0().Text = "注册码不对！";
}
else
{
string text3 = Strings.Mid(text2, 1, 4) + Strings.Mid(text2, 9, 4);
string text4 = Strings.Mid(text2, 5, 1);
string text5 = Strings.Mid(text2, 6, 1);
string text6 = Strings.Mid(text2, 7, 1);
string text7 = Strings.Mid(text2, 8, 1);
string text8 = Strings.Mid(text2, 13, 1);
string str = Strings.Mid(text2, 14, 1);
if ((Operators.CompareString(text4, "6", false) == 0) | (Operators.CompareString(text4, "7", false) == 0) | (Operators.CompareString(text4, "B", false) == 0))
{
text4 = "1";
}
if ((Operators.CompareString(text4, "8", false) == 0) | (Operators.CompareString(text4, "9", false) == 0) | (Operators.CompareString(text4, "C", false) == 0))
{
text4 = "2";
}
if (Operators.CompareString(text5, "A", false) == 0)
{
text5 = "0";
}
if (Operators.CompareString(text5, "B", false) == 0)
{
text5 = "1";
}
if (Operators.CompareString(text5, "C", false) == 0)
{
text5 = "2";
}
if (Operators.CompareString(text5, "D", false) == 0)
{
text5 = "3";
}
if (Operators.CompareString(text5, "E", false) == 0)
{
text5 = "4";
}
if (Operators.CompareString(text5, "F", false) == 0)
{
text5 = "5";
}
if (Operators.CompareString(text5, "G", false) == 0)
{
text5 = "6";
}
if (Operators.CompareString(text5, "H", false) == 0)
{
text5 = "7";
}
if (Operators.CompareString(text5, "J", false) == 0)
{
text5 = "8";
}
if (Operators.CompareString(text5, "K", false) == 0)
{
text5 = "9";
}
string value = "20" + text4 + text5;//5、6位组成年份
if ((Operators.CompareString(text6, "6", false) == 0) | (Operators.CompareString(text6, "7", false) == 0) | (Operators.CompareString(text6, "B", false) == 0))
{
text6 = "1";
}
if ((Operators.CompareString(text6, "4", false) == 0) | (Operators.CompareString(text6, "5", false) == 0) | (Operators.CompareString(text6, "A", false) == 0))
{
text6 = "0";
}
if (Operators.CompareString(text7, "A", false) == 0)
{
text7 = "0";
}
if (Operators.CompareString(text7, "B", false) == 0)
{
text7 = "1";
}
if (Operators.CompareString(text7, "C", false) == 0)
{
text7 = "2";
}
if (Operators.CompareString(text7, "D", false) == 0)
{
text7 = "3";
}
if (Operators.CompareString(text7, "E", false) == 0)
{
text7 = "4";
}
if (Operators.CompareString(text7, "F", false) == 0)
{
text7 = "5";
}
if (Operators.CompareString(text7, "G", false) == 0)
{
text7 = "6";
}
if (Operators.CompareString(text7, "H", false) == 0)
{
text7 = "7";
}
if (Operators.CompareString(text7, "J", false) == 0)
{
text7 = "8";
}
if (Operators.CompareString(text7, "K", false) == 0)
{
text7 = "9";
}
string value2 = text6 + text7;//7、8位组成月份
if (Operators.CompareString(text8, "A", false) == 0)
{
text8 = "0";
}
if (Operators.CompareString(text8, "B", false) == 0)
{
text8 = "1";
}
if (Operators.CompareString(text8, "C", false) == 0)
{
text8 = "2";
}
string value3 = text8 + str;//13、14位组成日
if (((text2.Length == 15) & ((Operators.CompareString(Strings.Mid(text2, 15, 1), "1", false) == 0) | (Operators.CompareString(Strings.Mid(text2, 15, 1), "2", false) == 0))) && Class1.smethod_0().FileSystem.FileExists(Class20.string_8 + "\syspnam730.dll"))
{
Class1.smethod_0().FileSystem.DeleteFile(Class20.string_8 + "\syspnam730.dll");
}
int num = Conversions.ToInteger(value);//年 28) | (num 2030) | (num2 12) | (num
分析可知：注册码长度15位，1-4位+9-12位为机器码转换信息，5、6位授权年份信息，7、8位授权月份信息，13、14位授权日信息，第15位1或2固定。
且年
机器码和注册码比较Class18.smethod_3(ref text, ref text3)
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跟进看一下，调用太复杂，不容易得到算法，也是原贴楼主困惑的地方，相互调用太多了，直接挖代码可能有难度，换个思路直接反射调用。
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注册机编写
试了下反射调用成功。
获取机器码：
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机器码转换：
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注册码拼接：
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搞定~~~
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