How can I get the assembly last modified date?

user_1782 0
Viewed 23533

I want to render (for internal debugging/info) the last modified date of an assembly, so I'll know when a certain website was deployed.

Is it possible to get it through reflection?

I get the version like this:

Assembly.GetExecutingAssembly().GetName().Version.ToString();

I'm looking for something similar -- I don't want to open the physical file, get its properties, or something like that, as I'll be rendering it in the master page, and don't want that kind of overhead.

modified-date file-properties reflection asp.net .net
6 Answers

I'll second pYrania's answer:

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

But add this:

You mention you don't want to access the file system since it's in your master page and you don't want to make that extra file system hit for every page. So don't, just access it once in the Application load event and then store it as an application-level variable.

user_9450

If you default the Revision and Build Numbers in AssemblyInfo:

[assembly: AssemblyVersion("1.0.*")]

You can get the an approximate build date with:

Version version = typeof(MyType).Assembly.GetName().Version;
DateTime date = new DateTime(2000, 1, 1)
    .AddDays(version.Build)
    .AddSeconds(version.Revision * 2);
Hallgrim_154540

How about this?

System.Reflection.Assembly assembly = System.Reflection.Assembly.GetExecutingAssembly();
System.IO.FileInfo fileInfo = new System.IO.FileInfo(assembly.Location);
DateTime lastModified = fileInfo.LastWriteTime;
pYrania_332310

The RetrieveLinkerTimestamp solution will not work after the year 2038 due to the use of int32 from 1970. I suggest using the following (although this probably has its limitations too):

IO.File.GetLastWriteTime(Reflection.Assembly.GetExecutingAssembly().Location)
user_85560420

I don't believe the assembly holds last modified information as that is an operating system attribute. I believe the only way to get this information is through a file handle.

user_626230
Related