I have two assemblies:
- The parent assembly is compiled against .NET Framework.
- The child assembly is compiled against .NET Core.
I want to call a method in the child assembly, and retrieve its return object. The constructor doesn't take any parameters. The method does not take any parameters, and returns a Microsoft.OData.Edm.IEdmModel
Things I've tried so far:
- Creating a separate appdomain, and calling
domain.CreateInstanceAndUnwrap:
AppDomainSetup setup = new AppDomainSetup()
{
ApplicationBase = path
PrivateBinPath = path
};
AppDomain domain = AppDomain.CreateDomain("Child", null, setup);
AssemblyName assemblyName = AssemblyName.GetAssemblyName(assemblyPath);
object instance = domain.CreateInstanceAndUnwrap(assemblyName.FullName, className);
- Creating a class that extends
MarshalByRefObject, and using that to load the assembly, call the function, and marshal the return type:
AppDomain domain = AppDomain.CreateDomain("Child");
BinaryMarshal marshal = (BinaryMarshal) domain.CreateInstanceAndUnwrap(typeof(BinaryMarshal).Assembly.FullName, typeof(BinaryMarshal).FullName);
IEdmModel model = marshal.LoadEdmModel(path, className, functionName);
//BinaryMarshal.cs:
internal class BinaryMarshal : MarshalByRefObject
{
public IEdmModel LoadEdmModel(string binary, string className, string functionName)
{
Assembly assembly = Assembly.LoadFrom(binary);
Type type = assembly.GetType(className); //returns null because of exception listed below
}
}
In both cases, the code doesn't work because of the following exception (obtained from Fuslogvw.exe):
*** Assembly Binder Log Entry (4/29/2019 @ 10:34:48 AM) ***
The operation failed.
Bind result: hr = 0x80070002. The system cannot find the file specified.
Assembly manager loaded from: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll
Running under executable C:\develop\parent\out\debug-amd64\Parent.exe
--- A detailed error log follows.
=== Pre-bind state information ===
LOG: DisplayName = System.Runtime, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
(Fully-specified)
LOG: Appbase = file:///C:/develop/parent/out/debug-amd64/
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = NULL
LOG: AppName = Parent.exe
Calling assembly : Child, Version=5.0.0.0, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in LoadFrom load context.
WRN: Native image will not be probed in LoadFrom context. Native image will only be probed in default load context, like with Assembly.Load().
LOG: Using application configuration file: C:\develop\parent\out\debug-amd64\Parent.exe.Config
LOG: Using host configuration file:
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework64\v4.0.30319\config\machine.config.
LOG: Post-policy reference: System.Runtime, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
LOG: GAC Lookup was unsuccessful.
LOG: Attempting download of new URL file:///C:/develop/parent/out/debug-amd64//System.Runtime.DLL.
LOG: Attempting download of new URL file:///C:/develop/parent/out/debug-amd64//System.Runtime/System.Runtime.DLL.
LOG: Attempting download of new URL file:///C:/develop/parent/out/debug-amd64//System.Runtime.EXE.
LOG: Attempting download of new URL file:///C:/develop/parent/out/debug-amd64//System.Runtime/System.Runtime.EXE.
LOG: Attempting download of new URL file:///C:/develop/child/out/debug-amd64/netcoreapp2.0/System.Runtime.DLL.
LOG: Attempting download of new URL file:///C:/develop/child/out/debug-amd64/netcoreapp2.0/System.Runtime/System.Runtime.DLL.
LOG: Attempting download of new URL file:///C:/develop/child/out/debug-amd64/netcoreapp2.0/System.Runtime.EXE.
LOG: Attempting download of new URL file:///C:/develop/child/out/debug-amd64/netcoreapp2.0/System.Runtime/System.Runtime.EXE.
LOG: All probing URLs attempted and failed.
From what I can tell, it's trying to load System.Runtime, which fails because parent app already has a different version of System.Runtime loaded.
Is this even possible?
