Generic method using delegates

Question

Hi All,

I have to create generic method that should return generic type.

Class Form
{
int eid;
string Ename;
string joindate;
}

Class Course
{
int eid;
string courseName;
string joindate;
}

public void getvalue()
{
eid=1;joindate="10/05/2001";

public List<Form> LstFrm= new List<Form>();
LstFrm.Add(new Form{eid=1,fname="AA",joindate="10/05/2001"});
LstFrm.Add(new Form{eid=1,fname="AA",joindate="10/05/2001"});
LstFrm.Add(new Form{eid=2,fname="AAE",joindate="11/05/2001"});

GetDetails(LstForm,eid,joindate);
public List<Course> Lstcourse= new List<Course>();
Lstcourse.Add(new Form{eid=1,courseName="BA",joindate="10/05/2001"});
Lstcourse.Add(new Form{eid=1,courseName="BA",joindate="10/05/2001"});
Lstcourse.Add(new Form{eid=2,courseName="MBA",joindate="11/05/2001"});

GetDetails(Lstcourse,eid,joindate);

}

Can anyone explain how to write GetDetails method that should return list of object as generic type

---

SaranRam

Answer 1

Hi Saranram, 

     You want your function "GetDetails" should return "Form" type when you pass "LstForm" and 'Course" type when you pass "LstCourse" ??

---

Satya R Biswal

Answer 2

Right now you are returing a void.  Use object which can be cast to most other types and other types ca be cast to an object

From : public void getvalue()
To :   public object getvalue()

---

jdweng

Answer 3

Yes Satya,

---

SaranRam

Answer 4

Ok You can return type of Object and later you can type cast that object . 

---

Satya R Biswal

Answer 5

public List<T> GetDetails<T>(List<T> lst,int eid,string joindate)
{
     //perform your task and return the list of object
}

You can try with the above code, and call as below -

GetDetails<Form>(LstForm,eid,joindate);

---

Avik Das

Answer 6

Create an empty interface and let both of your classes implement that,

public interface ICommon { }

class Form : ICommon           class Course : ICommon
{                              {
   int eid;                         int eid;
   string Ename;                    string Ename;
   string joindate;                 string joindate;
}                              }

Then you can write you GetDetails method as,

public List<T> GetDetails<T>() where T:ICommon
{
    ...
}

I hope this helps.

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