https://www.red-gate.com/dynamic/products/dotnet-development/reflector/download
https://github.com/sailro/Reflexil/releases
The .NET Assembly Editor http://reflexil.net
Reflexil is an assembly editor and runs as a plug-in for Red Gate's Reflector, ILSpy and Telerik's JustDecompile.
Reflexil is using Mono.Cecil, written by Jb Evain and is able to manipulate IL code and save the modified assemblies to disk. Reflexil also supports C#/VB.NET code injection.
https://www.codeproject.com/Articles/20565/Assembly-Manipulation-and-C-VB-NET-Code-Injection
需要注意的是右下角的editor不是自动出现的，需要选择菜单Tools，然后选择Reflexil v2.3，然后才会出现edit的页面
修改完之后，另存为
另存为一次，好像就自动签名了。再次编辑之前另存为的，会提示
