Disposify

Warning

Currently very experimental.

Disposify is a source generator to subscribe / unsubscribe C# events with using-dispose pattern.

using System;
using Disposify;

var c = new C();

using (c.Disposify().SomeEvent(v => ++v)) // subscribe with lambda
{
    c.Invoke(100);

} // unsubscribe on Dispose()

public class C
{
    public event Func<int, int>? SomeEvent;
    public int Invoke(int a) => SomeEvent.Invoke(a);
}

It is also useful to convert callbacks into await pattern.

using System;
using System.Threading.Tasks;
using Disposify;

var c = new C();
var tcs = new TaskCompletionSource<int>();

using (c.Disposify().SomethingCompleted(result => tcs.TrySetResult(result)))
{
    var result = await tcs.Task;
}

public class C
{
    public event Action<int>? SomethingCompleted;
}

Installation

NuGet

Install from https://www.nuget.org/packages/Disposify/ .

Unity

Unity 2022.3.12f1 and later is supported.

Add a git dependency to package manager:

https://github.com/ruccho/Disposify.git?path=/Disposify.Unity/Packages/com.ruccho.disposify

Features

• Disposifying events declared in non-generic classes

Not supported yet

• Disposifying events declared in generic types and value types

Performance

• Returned IDisposables are automatically pooled after the disposal.
• Disposify() seems to return dynamic but is replaced by performant overload (no dynamic, no boxed) by the source generator.

Usages

Disposifying static events

For instance types, use ((T)null).Disposify().

using System;
using Disposify;

using (((C)null).Disposify().SomeEvent(v => ++v))
{
    C.Invoke(100);
}

public class C
{
    public static event Func<int, int>? SomeEvent;
    public static int Invoke(int a) => SomeEvent.Invoke(a);
}

For static types, use [GenerateDisposifier(typeof(T))].

using System;
using Disposify;

using (C_Disposifier.SomeEvent(v => ++v))
{
    C.Invoke(100);
}

public static class C
{
    public static event Func<int, int>? SomeEvent;
    public static int Invoke(int a) => SomeEvent.Invoke(a);
}

[GenerateDisposifier(typeof(C))]
static partial class C_Disposifier 
{
    // members will be generated
}