StructureMap creating instance

Question

I have the concrete types for interfaces configured at startup, but I want to create instances of the concrete type at runtime with setting properties or setting different values in the constructor. All the creating of instances I see have the knowledge of what the concrete type is, at runtime I don't know the concrete type. Is there a way to create a concrete instance of an interface/class without knowing the concrete type? This is what I have seen:

[Test]
public void DeepInstanceTest_with_SmartInstance()
{
    assertThingMatches(registry =>
    {
        registry.ForRequestedType<Thing>().TheDefault.Is.OfConcreteType<Thing>()
                .WithCtorArg("name").EqualTo("Jeremy")
                .WithCtorArg("count").EqualTo(4)
                .WithCtorArg("average").EqualTo(.333);
        });
}

OR:

var container = new  Container(x =>
{
    x.ForConcreteType<SimplePropertyTarget>().Configure
     .SetProperty(target =>
     {
         target.Name = "Max";
         target.Age = 4;
     });
});

I want to do something similar...but don't know the concrete type....only the abstract class or interface (would have properties in this case). The concrete type is configured though.

CSharpAtl · Accepted Answer · 2009-02-25 14:02:44Z

2

Found the answer with direction from Jeremy Miller (author of StructureMap). Here is where he pointed me to:

http://structuremap.sourceforge.net/RetrievingServices.htm#section5

here is an example of what I used:

IDatabaseRepository repo =
                ObjectFactory.With("server").EqualTo("servername").
                With("database").EqualTo("dbName").
                With("user").EqualTo("userName").
                With("password").EqualTo("password").
                GetInstance<IDatabaseRepository>();

answered Feb 25, 2009 at 14:02

CSharpAtl

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Community · Accepted Answer · 2017-05-23 11:47:54Z

0

You need some kind of factory pattern to create the concrete instances. The instant of creation necessarily needs to know what the concrete implementation is.

edited May 23, 2017 at 11:47

CommunityBot

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answered Feb 24, 2009 at 23:28

JaredReisinger

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1 Comment

CSharpAtl Over a year ago

you dont need a factory pattern because StructureMap takes care of that for you. I did find the answer though...thanks.

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