How to pass class list as function parameter c#

Question

0.00/5 (No votes)

See more:

Hi I have a function like bellow.

C#

public void test(??)
        {
           ..........
           ..........
         /*Here I nedd call list ,which I send as parametar*/
  List<??> rangePlants = something;
           ..........
           ..........
            
        }

I am trying to send a list of any class of my application as parameter.suppose I have 3 class A,B,C sometimes I have to pass List , List or List<c>.can any body help me with a example?

Posted 9-Jan-15 0:42am

KuntalBose

Add a Solution

Comments

BillWoodruff 9-Jan-15 8:29am

You need to clarify if you are talking about passing a List of Class Instances, or a List of Class Types. If you are passing Instances, then do the Instances all inherit from a common Interface or a common Class ?

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

KUMPREK · Answer 1 · 2015-01-09T00:58:00

You can make use of Interface over here.
Create an interface say "I" and implement that interface in all the 3 classes A,B,C.

After that in the method Test you can accept "I" and in the list also you can use "I", like..

public void test(I interfaceImplementedObject)
        {
           ..........
           ..........
         /*Here I nedd call list ,which I send as parametar*/
  List<I> rangePlants = something;
           ..........
           ..........

        }

**Zoltán Zörgő** · Answer 2 · 2015-01-09T01:01:00

Solution 2

You better make it generic:

C#

public void test<t>(rest of the parameter list)
        {
           ..........
           ..........
  List<t> rangePlants = something;
           ..........
           ..........           
        }
</t></t>

There might be situations where generic approach this is not applicable, like in case of Activator[^], in tat case, as you can see on the link you can pass Type typed parameter.

Posted 9-Jan-15 1:01am

Zoltán Zörgő

Comments

BillWoodruff 9-Jan-15 7:19am

I'd like to see you explain why/how 'Activator becomes an issue here. thanks, Bill

Zoltán Zörgő 9-Jan-15 8:55am

No, not an issue. In cases like the Activator.CreateInstance method, you can't use the generic approach, you need the type itself. But it depend on the actual action performed in the method.