How to pass ienumerable list as parameter in C#

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Dear All,

I have Candidate, Certificates and ExamSession as class.

And i'm getting these in a list, IEnumerable<candidate> for list of candidates,
IEnumerable<ceritificates> for list of certificates and IEnumerable<examsessions> for list of ExamSession.

What I have tried:

Now, my question is:

I wrote a method, in which, i want to pass IEnumerable<> as a Parameter. Here I don't which object I will call(Candidate/Certificate/ExamSession).

Can any one please help me, how to pass IEnumerable as a parameter in a given method...


Thanks

Posted 4-Mar-17 22:26pm

abdul subhan mohammed

Updated 4-Mar-17 22:48pm

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Graeme_Grant 5-Mar-17 4:30am

Post your code so that we can see...

Graeme_Grant 5-Mar-17 4:34am

By post your code, I mean click on Improve question

2 solutions

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Graeme_Grant · Accepted Answer · 2017-03-04T22:33:00

Solution 1

Unclear what you are asking for but here are 2 examples...

1. Standard

C#

void FuntionName(IEnummerable<candidate> Data)
{
    // do stuff with data...
}

2. Generic

C#

void FuntionName<T>(IEnummerable<T> Data)
{
    // do stuff with data...
}

Pretty simple - programming 101...

Posted 4-Mar-17 22:33pm

Graeme_Grant

Comments

abdul subhan mohammed 5-Mar-17 4:54am

thanks

OriginalGriff · Accepted Answer · 2017-03-04T22:48:00

Unless the three classes share a base class, you can't pass a collection of them to a method, except as a collection of object instances, any more than you could write a method that would take a single instance of any of the three classes, unless there is a direct conversion from A to B and vice versa.

So you could pass a collections of objects:

C#

List<MyClass> obs = new List<MyClass>();
...
MyMethod(obs);
...
public void MyMethod(IEnumerable<object> collection)
   {
   ...
   }

But that's a very poor design.
And it's unlikely that there will be a good reason for the three classes you mention to share a common base, so it's not likely that there would be a good design reason to wrote a single method to take a collection of all three classes, as pretty much the first thing it would have to do is find out what it had been passed so it could cast the objects appropriately to use them.
A better - but not much - approach would be to create four overloads:

public void MyMethod(IEnumerable<Candidate> c) { MyMethod(c, null, null); }
public void MyMethod(IEnumerable<Certificates> c) { MyMethod(null, c, null); }
public void MyMethod(IEnumerable<ExamSession> c) { MyMethod(null, null, c); }
public void MyMethod(IEnumerable<Candidate> cand, IEnumerable<Certificates> cert, IEnumerable<ExamSession> es)
    {
    ...
    }

As at least that way you can check more easily, and retain some strong typing.

But to be honest you would be better off rethinking this approach.