C# : Convert string to Object

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Dear All,
I want to write a function whose arguments are generic (so that i can pass ny type like string or defined struct. I wore like below

C#

public struct Book
{
    public decimal price;
    public string title;
    public string author;
}


public int GenericFun(                                            Object i_objCondition,
                                            List<Object> io_objListOutValue)
{
// Do some operation
}

int main()
{
    List<string>    Obj1      = null;
            string          s1= ""s1;
            string          s2= "s2";

            Obj1.Add(strLoginName);
            Obj1.Add(strpassword);
            Obj1.Add(strdomain);

    string sCondition = "";
    GenericFun(sCondition, Obj1);

    List<Book> objBook = null;
    Book Book1;
    Book Book2;
    GenericFun(sCondition, objBook);
}

But I';m getting error "Argument 2: cannot convert from System.Collections.Generic.List<string> to System.Collections.Generic.List<object>

Posted 29-Apr-12 20:22pm

vidiking

Updated 29-Apr-12 20:29pm

v2

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3 solutions

Solution 1

C#

//In GenericFun() method call, use casting as below
GenericFun((Object)sCondition, (List<Object>)objBook);
</string>

Posted 29-Apr-12 20:34pm

summon_19

Updated 29-Apr-12 20:43pm

v3

Comments

vidiking 30-Apr-12 2:42am

GenericFun(sCondition, (List<Object>)objBook);
is giving below error.
error CS0030: Cannot convert type System.Collections.Generic.List<string>' to 'System.Collections.Generic.List<object>'

summon_19 30-Apr-12 2:48am

was your first problem with the first method call or the second method call?

vidiking 30-Apr-12 2:56am

Both. :(

Solution 2

A penality in using these generics is boxing/unboxing. I guess, you have to convert List<string> to List<object> and then pass on to the method.
You can try using Obj1.CovertAll(...) method for doing this

Posted 29-Apr-12 20:44pm

Lakamraju Raghuram

Comments

vidiking 30-Apr-12 2:54am

Thank u Lakamraju. I'm new to C#. Can u plz tell me how to do?

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VJ Reddy · Accepted Answer · 2012-04-29T21:31:00

A similar problem is discussed here
http://stackoverflow.com/questions/6557/in-c-why-cant-a-liststring-object-be-stored-in-a-listobject-variable[^]

To convert List<string> to List<object>, each element of List<string> is to be cast to object type as below

C#

List<string> Obj1 = new List<string>();
Obj1.Add(strLoginName);
Obj1.Add(strpassword);
Obj1.Add(strdomain);
List<object> Obj1AsObjects = Obj1.Cast<object>().ToList();
string scondition = "";
GenericFun(scondition, Obj1AsObjects);

But then in GenericFun what operation can be done on the parameters. Because, Object type has only the basic methods, which may not be much useful to perform some practical calculations or other manipulations. Hence, it is preferable create a heirarchy using classes and interfaces and then pass the parameter type as the base class of this heirarchy.