C# place a TYPE into a variable and use it instead of type at declaration of new variables

Question

I searched on the site for an answer that I needed, but I could not find it...

I have this:

string sNameOfClass="BusNode";

And the class already exists, and has its own properties.

Now I need to do something like this, but I dont know how...

sNameOfClass variable1 = new sNameOfClass()

and use varible1 forward in program as a normal variable...

so like

coorinateClass cs = new ks();
cs.a=11;
cs.b=33;
cs.c=55;

Any clues?

Thank you in advance

Why do you think you need to do this? What *actual problem* are you trying to solve? — Jon Skeet, Jul 08 '16 at 08:26
You need to put actual code in the question, with actual code formatting.... — Callum Linington, Jul 08 '16 at 08:34
seems like he has a typename in a string and wants to create an instance of the class the type refers to — Ashley John, Jul 08 '16 at 08:36
i have a list of classNames...witch has more then 1000 classes....and now i need to access all of them like that,... — Stefan, Jul 08 '16 at 08:40
How do you know what you're supposed to do with each of those "classes"? — Luaan, Jul 08 '16 at 08:46

score 1 · Answer 1 · answered Jul 08 '16 at 08:47

1

If you need to manage a class with its name you can use this:

//your class name
string sNameOfClass = "YourNameSpace.BusNode";
//create type class from your class name
Type T = Type.GetType(sNameOfClass);
//create new instance of class
var NewInstanse = Activator.CreateInstance(T);
//set property 
T.GetProperty("a").SetValue(NewInstanse, 11);
//get value of property
var a = T.GetProperty("a").GetValue(NewInstanse);

answered Jul 08 '16 at 08:47

aDDin

53
3

An unhandled exception of type 'System.ArgumentNullException' occurred in mscorlib.dll Additional information: Value cannot be null. ---- error at line var NewInstanse = Activator.CreateInstance(T); – Stefan Jul 08 '16 at 08:55
i see Type T = Type.GetType(sNameOfClass); is null, – Stefan Jul 08 '16 at 08:58
i see the problem, it does not recognises the namespace for that class... but that is my problem...thx bro u helped me a lot.... – Stefan Jul 08 '16 at 09:07

score 1 · Answer 2 · answered Jul 08 '16 at 08:48

1

You can use Activator.CreateInstance Method

Check out this link : Activator.CreateInstance Method (String, String)

answered Jul 08 '16 at 08:48

Kahbazi

14,331
3
45
76

score 0 · Answer 3 · answered Jul 08 '16 at 08:45

0

string sNameOfClass="BusNode";

switch (sNameOfClass)
{
 case "BusNode":
       BusNode variable1 = new BusNode()
       break;
 case "...."
       break;
}

answered Jul 08 '16 at 08:45

andy

5,979
2
27
49

Above code is useful for small number of classes....Please check once "CreateInstance vs new" http://stackoverflow.com/questions/1649066/activator-createinstancet-vs-new – andy Jul 08 '16 at 08:56

C# place a TYPE into a variable and use it instead of type at declaration of new variables

3 Answers3