activator and how we can use it

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1.50/5 (2 votes)

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what is the exact use of activator class???

C#

 Type ClassType = Type.GetType(ClassName + ", TMS.API, Version=1.0.0.0, Culture=neutral,  Custom=null");
            try
            {
                // Open connection
                OpenConnection();
                // Create the command
                //Execute the SP and return Reader
                dataReaderToFill = ExecuteReaderForXML(spName, baseObject.GetXML());
                int ColumnLength = dataReaderToFill.FieldCount;
                while (dataReaderToFill.Read())
                {
                    Object ClassObject = Activator.CreateInstance(ClassType);

...

Posted 24-Jun-13 6:27am

anurag19289

Updated 24-Jun-13 6:31am

Ron Beyer

v2

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[no name] 24-Jun-13 12:31pm

You will get along much better if you just start reading the documentation instead of these endless "what is x used for" postings. http://msdn.microsoft.com/en-us/library/system.activator.aspx

2 solutions

Solution 2

Activator is part of the reflection stuff built into .Net, and as such, is good for dynamically instantiating a class.

If you're using the factory pattern, Activator is your best friend.

I frequently use it for process-handler factories (don't confuse this with HTTP handlers, they're different). I build an abstract base class and some processes that use that base class, calling its abstract methods to get something done. Then I put the fully-qualified type name of the child classes into a database or other configuration, and instantiate from that.

Typically it goes something like this:

C#

// do something to get type name here, for now, just pretend it's stored in childClassName
Type t = Type.GetType(childClassName);
FooBaseClass fbc = (FooBaseClass)Activator.CreateInstance(t);
// fbc is ready to use as an instance of a child class of FooBaseClass

That's the core of a configuration-driven factory.

Posted 24-Jun-13 10:20am

Mattintosh

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Ron Beyer · Accepted Answer · 2013-06-24T06:30:00

Solution 1

Quote:
Contains methods to create types of objects locally or remotely, or obtain references to existing remote objects.

System.Activator[^]

In the case above, its being used to create a class based on the type of the class. The type of the class is created dynamically in the first line.

Posted 24-Jun-13 6:30am

Ron Beyer

Updated 24-Jun-13 6:32am

v3

Comments

Sergey Alexandrovich Kryukov 24-Jun-13 12:53pm

5ed. ThePhantomUpvoter correctly pointed out that such questions are not productive.
—SA