compile code at run-time and use assemblies loaded on memory

Question

I need to compile C# code at run-time. I'm using the code like this:

CSharpCodeProvider provider = new CSharpCodeProvider();
CompilerParameters parameters = new CompilerParameters();
parameters.ReferencedAssemblies.Add("MyLibrary.dll");    // File Path on Hard Drive
...

But I want to use the libraries loaded on memory instead of their file addresses. Is it possible?

This is a very persistent myth. "Loaded on memory" is an illusion, current compilers (csc.exe in your case) run out-of-process and read/write assemblies on disk. All that the GenerateInMemory property does is forcing a call to Assembly.LoadFrom(). So just don't bother. — Hans Passant
– Hans Passant, Commented Sep 2, 2014 at 11:06

Patrick Hofman · Accepted Answer · 2014-09-02 10:46:05Z

3

If it is an assembly that isn't generated in-memory only, you could use:

parameters.ReferencedAssemblies.Add
( typeof(ClassInAssemblyYouWantToAdd).Assembly.Location
);

Or:

parameters.ReferencedAssemblies.Add
( Assembly.Load("Full.Qualified.Assembly.Name").Location
);

The Location property has the path to the assembly loaded.

It has to have a hard copy of the assembly, and not just something in memory, so you can't just use generated assemblies for that. You could save the in-memory generated assemblies to disk first if you need to use them.

edited Sep 2, 2014 at 10:46

answered Sep 2, 2014 at 9:49

Patrick Hofman

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14 Comments

Ali Sepehri Over a year ago

I do some pre-process on my assemblies and load them on memory. I have their Assembly object. In this case can I use your code?

Patrick Hofman Over a year ago

Sure. Give it a try and tell me if you experience any problems.

Patrick Hofman Over a year ago

If that wrong? You can't just put there in-memory assemblies as explained in the post.

Patrick Hofman Over a year ago

No, but you can save it first. Set the compilerParams.OutputAssembly to a file path.

Patrick Hofman Over a year ago

Too bad. Also see Hans' comment. I think there is not much to do.

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