I was having trouble with performance when using Roslyn to compile to a dynamic assembly. Compilation was taking ~3 seconds, compared to ~300 milliseconds to compile the same code when using the CodeDom
compiler. Here's a pared-down version of the code I'm using to do the compilation:
var compilation = CSharpCompilation.Create(
"UserPayRules.dll",
syntaxTrees,
assembliesToAdd);
using (var stream = new MemoryStream())
{
stopWatch.Start();
var result = compilation.Emit(stream);
stopWatch.Stop();
Debug.WriteLine("Compilation: {0}", stopWatch.ElapsedMilliseconds);
if (!result.Success)
{
throw new InvalidOperationException();
}
var assembly = Assembly.Load(stream.GetBuffer());
}
This answer suggests passing a ModuleBuilder object into the Emit method instead of a MemoryStream in order to speed things up. I tried to follow that pattern, like so:
var compilation = CSharpCompilation.Create(
"UserPayRules.dll",
syntaxTrees,
assembliesToAdd);
var assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(
new AssemblyName("ThisAssembly"),
AssemblyBuilderAccess.RunAndCollect);
var moduleBuilder = assemblyBuilder.DefineDynamicModule("ThisModule");
var result = compilation.Emit(moduleBuilder);
Debug.WriteLine("Compilation: {0}", stopWatch.ElapsedMilliseconds);
if (!result.Success)
{
throw new InvalidOperationException();
}
var assembly = Assembly.Load(stream.GetBuffer());
But my version of Roslyn apparently doesn't have an overload of the Emit
method that takes a ModuleBuilder
. That version is:
Id: Microsoft.CodeAnalysis
Version: 0.6.4033103-beta (Prerelease)
Project Information: http://msdn.microsoft.com/en-US/roslyn
Obviously, this is a prerelease, so it's not strange that the api might have changed. However,
My Question(s)
- Does anyone know why the
Emit
method no longer seems to have an overload that takes a ModuleBuilder
?
- Is there another way to make this compilation faster while still using Roslyn (Roslyn offers a couple advantages over the
CodeDom
and Mono compilers that I'd prefer not to give up)?
See Question&Answers more detail:
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