MarshalByRefProxy 0.2.1

There is a newer version of this package available.
See the version list below for details.
dotnet add package MarshalByRefProxy --version 0.2.1                
NuGet\Install-Package MarshalByRefProxy -Version 0.2.1                
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="MarshalByRefProxy" Version="0.2.1" />                
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add MarshalByRefProxy --version 0.2.1                
#r "nuget: MarshalByRefProxy, 0.2.1"                
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install MarshalByRefProxy as a Cake Addin
#addin nuget:?package=MarshalByRefProxy&version=0.2.1

// Install MarshalByRefProxy as a Cake Tool
#tool nuget:?package=MarshalByRefProxy&version=0.2.1                



A .NET library for marshalling any object by reference that do not require the object to inherit from MarshalByRefObject.

This project is based on ImpromptuInterface.

Basic usage

using MarshalByRefAsProxy;

public interface IProxyInterface
    string GetCurrentAppDomainName();

// UnmarshallableClass is not required to inherit from IProxyInterface.
// Here we inherit from IProxyInterface just to be able to call CreateInstance() for comparison.
class UnmarshallableClass : IProxyInterface
    public string GetCurrentAppDomainName() => AppDomain.CurrentDomain.FriendlyName;

class ClassFactory : MarshalByRefObject
    public IProxyInterface CreateInstance() => new UnmarshallableClass();

    public IProxyInterface CreateMarshalByRefInstance() => new UnmarshallableClass().MarshalByRefAs<IProxyInterface>();

public void TestCrossAppDomain()
    // Create an application domain named TestDomain
    AppDomain domain = AppDomain.CreateDomain("TestDomain");
    ClassFactory factory = (ClassFactory)domain.CreateInstanceFromAndUnwrap(typeof(ClassFactory).Assembly.Location, typeof(ClassFactory).FullName);

    // Try to marshal an unmarshallable object, which throws a SerializationException
    Assert.Throws<SerializationException>(() => factory.CreateInstance().GetCurrentAppDomainName());

    // Try to marshal an unmarshallable object via MarshalByRefProxy, which works fine
    Assert.AreEqual("TestDomain", factory.CreateMarshalByRefInstance().GetCurrentAppDomainName());


class TaskTest : MarshalByRefObject
    // Cannot be an async method
    // The return type cannot be IAwaitable<T>
    public IAwaitable GetCurrentAppDomainNameAsync()
        // IAwaitable is defined by MarshalByRefProxy
        return Task.Run(() => AppDomain.CurrentDomain.FriendlyName).MarshalByRefAs<IAwaitable>();

public async Task TestTask()
    AppDomain domain = AppDomain.CreateDomain("TestDomain");
    TaskTest test = (TaskTest)domain.CreateInstanceFromAndUnwrap(typeof(TaskTest).Assembly.Location, typeof(TaskTest).FullName);

    string name = (string)await test.GetCurrentAppDomainNameAsync();
    Assert.AreEqual("TestDomain", name);

Why can we await IAwaitable? Because C# can await any awaitable expressions, which is exactly what IAwaitable stands for.


  • IAwaitable<T>
  • MarshalByRefWrapper Code Generators
  • MarshalByRefObject Code Generators
Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

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Version Downloads Last updated
0.3.0 358 1/25/2023
0.2.1 257 1/20/2023
0.2.0 262 1/20/2023
0.1.0 262 1/20/2023