如何获取C＃.NET编译器程序集GUID

Question

I am trying to figure out when an assembly has changed (even when version number is the same).

Best effort for now is finding out it has been recompiled, therefore would like to use the same item that MSBuild uses, which I believe is the files GUID stored in meta data? (As per The .NET File Format )

Is there any way I can access this info without re-inventing the wheel and dropping down to file bytes?

Answer 1

Well, it seems that assemblies do not have associated GUIDs. Modules, classes, methods, fields have GUIDs, and the "GUID" stream in a assembly is a place to store them.

If you want to access meta infomations of a assembly (eg GUID of its main module), Mono.Cecil may be a good option.

But instead, you can achieve that by calucating a checksum using a hash function, or just taking a look at the modification date. System.IO.FilesystemWatcher is able to inform you, if you do not want to access the file intervally.

Answer 2

Try to store in a variable last modified date of the assembly and check against it. Here is how to get last modified date of an assembly:

System.Reflection.Assembly assembly = System.Reflection.Assembly.GetExecutingAssembly();
System.IO.FileInfo fileInfo = new System.IO.FileInfo(assembly.Location);
DateTime lastModified = fileInfo.LastWriteTime;