How do I create Tagged Litetimes in Simple Injector?

Question

What I want is Simple Injector's equivalent of Autofac's tagged lifetimes:

I've read Simple Injector's documentation. The most probable way to accomplishing this is by using Simple Injector's custom lifestyles:

But the documentation on it is very sparse and I can't figure out how to get what I want from it. How can I get the equivalent of Autofac's tagged scopes in Simple Injector?

Example of something I would want:

// Arrange
var container = new Container();

container.Register<ICommand, ConcreteCommand>(new AsyncScopedLifestyle());
container.Register<IDBContext, ConcreteDbContext>(new AsyncScopedLifestyle("dbContext"));

using (AsyncScopedLifestyle.BeginScope(container))
{
    // Act
    var iCommandInstance1 = container.GetInstance<ICommand>();
    IDBContext iDbContextInstance1 = null;
    IDBContext iDbContextInstance2 = null;

    using (AsyncScopedLifestyle.BeginScope(container, "dbContext"))
    {
        var iCommandInstance2 = container.GetInstance<ICommand>();
        iDbContextInstance1 = container.GetInstance<IDBContext>();

        // Call things that depend on IDBContext here

        // Assert
        Assert.IsTrue(object.ReferenceEquals(iCommandInstance1, iCommandInstance2));
    }

    using (AsyncScopedLifestyle.BeginScope(container, "dbContext"))
    {
        var iCommandInstance3 = container.GetInstance<ICommand>();
        iDbContextInstance2 = container.GetInstance<IDBContext>();

        // Call things that depend on IDBContext here

        // Assert
        Assert.IsTrue(object.ReferenceEquals(iCommandInstance1, iCommandInstance3));
    }

    Assert.IsFalse(object.ReferenceEquals(iDbContextInstance1, iDbContextInstance2));
}

In my case it would not make sense to have the two IDBContext instances be the same.

There is no equivalent in Simple Injector. Please provide us with an example of what it is you are trying to achieve, and why. — Steven, Jun 26 '19 at 16:19
Thank you for providing an example. Unfortunately, what you are describing is the [XY problem](https://meta.stackexchange.com/questions/66377/what-is-the-xy-problem). Can you instead explain *the actual problem*? — Steven, Jun 27 '19 at 11:14

score 0 · Accepted Answer · answered Jul 19 '19 at 12:42

Simple Injector does not support this feature. If you want to implement this feature manually with custom lifestyles, you'll have to rewrite a large part of Simple Injector. If you really want this feature, use AutoFac, or some other dependency injection framework that supports it.

How do I create Tagged Litetimes in Simple Injector?

1 Answers1