.NET5以上显示build time

date

Sep 27, 2022

slug

10062

status

Published

tags

summary

type

Post

Displaying the build date

As pointed out by @c00000fd in the comments. Microsoft is changing this. And while many people don't use the latest version of their compiler I suspect this change makes this approach unquestionably bad.

https://stackoverflow.com/questions/1600962/displaying-the-build-date

Add a class like this to your project:

namespace SuperDuper
{
    [AttributeUsage(AttributeTargets.Assembly)]
    public class BuildDateTimeAttribute : Attribute
    {
        public string Date { get; set; }
        public BuildDateTimeAttribute(string date)
        {
            Date = date;
        }
    }
}

Update the .csproj of your project to include something like this:

<ItemGroup>
    <AssemblyAttribute Include="SuperDuper.BuildDateTime">
        <_Parameter1>$([System.DateTime]::Now.ToString("s"))</_Parameter1>
    </AssemblyAttribute>
</ItemGroup>

Note that _Parameter1 is a magical name - it means the first (and only) argument to the constructor of our BuildDateTime attribute class.

That's all that is needed to record the build datetime in your assembly.

And then to read the build datetime of your assembly, do something like this:

private static DateTime? getAssemblyBuildDateTime()
{
    var assembly = System.Reflection.Assembly.GetExecutingAssembly();
    var attr = Attribute.GetCustomAttribute(assembly, typeof(BuildDateTimeAttribute)) as BuildDateTimeAttribute;
    if (DateTime.TryParse(attr?.Date, out DateTime dt))
        return dt;
    else
        return null;
}

Note (per Flydog57 in the comments) that if your .csproj has property GenerateAssemblyInfo listed in it and set to false, the build won't generate assembly info and you'll get no BuildDateTime info in your assembly. So either do not mention GenerateAssemblyInfo in your .csproj (this is the default behaviour for a new project, and GenerateAssemblyInfo defaults to true if not specifically set to false), or explicitly set it to true.