CODEWITHSUNDEEP
c#system.reflection
Scorpion
Scorpion

Reputation: 4575

Null Reference Exception with System.Reflection.Assembly

I have developed a Library for internal email reporting. When I am using that Library from another project (By Adding Reference).

It gives NullReferenceException on the following line. 

System.Reflection.Assembly.GetEntryAssembly().GetName().Name

Any idea, why Assembly is null?

Upvotes: 19

Views: 11320

Answers (3)

veuncent
veuncent

Reputation: 1712

Answering both the OP's and @Neeraj 's questions: sometimes it can also be useful to get the root of your assembly with Assembly.GetExecutingAssembly().Location (e.g. when the Resharper test runner is making your life hard when using GetEntryAssembly())

string rootDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
string someFile = Path.Combine(
            rootDir ?? throw new InvalidOperationException(),
            "Foo",
            "Bar.txt");

Upvotes: 0

Scorpion
Scorpion

Reputation: 4575

problem is solved guys,

I am using 

Assembly.GetAssembly(ex.TargetSite.DeclaringType.UnderlyingSystemType).GetName().Name

to get the EntryAssemblyName.
In this case I already has parameter which is taking Exception 'ex', so I solved it by using that.

Many Thanks Guys, specially @Aliostad

Cheers

Upvotes: 2

Aliostad
Aliostad

Reputation: 81660

This is expected especially in the Windows Services where they are loaded by an unmanaged runtime.

Use:

  Process.GetCurrentProcess().MainModule.FileName

To get unmanaged entry point file.

Update

It seems you are looking for this:

  System.Reflection.Assembly.GetExecutingAssembly().GetName().Name

Upvotes: 30

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