Activator createinstance examples

Purpose of Activator. CreateInstance with example? C Using Activator. CreateInstance Creating an object without knowing the class name at design time. CreateInstance null, node. Attributes["Type"] ; This is very useful, for building dynamic enviroments. CreateInstance typeof object , instances. CreateInstance Type. GetType instances[i] ; instlist.

FullName, o. ToString , o. OR another case is when you have a common entities factory, which creates entity, and is also responsible on initialization of an entity by data received from DB:.

The Activator. CreateInstance method creates an instance of a specified type using the constructor that best matches the specified parameters. For example, let's say that you have the type name as a string, and you want to use the string to create an instance of that type. You could use Activator. CreateInstance for this:.

Building off of deepee1 and this , here's how to accept a class name in a string, and then use it to read and write to a database with LINQ. I use "dynamic" instead of deepee1's casting because it allows me to assign properties, which allows us to dynamically select and operate on any table we want. Why would you use it if you already knew the class and were going to cast it? Why not just do it the old fashioned way and make the class like you always make it?

There's no advantage to this over the way it's done normally. Is there a way to take the text and operate on it thusly:. Coupled with reflection, I found Activator. CreateInstance to be very helpful in mapping stored procedure result to a custom class as described in the following answer.

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Ask Question. Asked 10 years, 3 months ago. Active 4 months ago. Viewed k times. Can someone explain Activator. CreateInstance purpose in detail? Improve this question. Tabriz Atayi Tabriz Atayi 5, 7 7 gold badges 27 27 silver badges 32 32 bronze badges.

Probably that the greater documentation and example isn't available in the generic overloads. The MSDN page just has a single explanatory line, "Contains methods to create types of objects locally or remotely, or obtain references to existing remote objects.

This class cannot be inherited. An array of one or more attributes that can participate in activation. Typically, an array that contains a single UrlAttribute object that specifies the URL that is required to activate a remote object.

This parameter is related to client-activated objects. Client activation is a legacy technology that is retained for backward compatibility but is not recommended for new development. Distributed applications should instead use Windows Communication Foundation. An instance of the specified type, or null if typeName is not found. The supplied arguments are used to resolve the type, and to bind the constructor that is used to create the instance.

A non-empty activation attributes array is passed to a type that does not inherit from MarshalByRefObject. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Create Instance Method Reference Is this page helpful? Activator Class contains methods to create types of objects locally or remotely, or obtain references to existing remote objects.

The factory method is used Activator. CreateInstance to create the object by the use of a fully qualified string class name. Activator class is used dynamically to construct objects at run time. And the Activator. CreateInstance is makes the method completely agnostic as to the class that is being created. In other words, the code will never make a direct reference to the class name.

Activator is used with so-many member's like some are:. Home Explore Tags Contribute.