Casting a class in another class

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Hi Friends...

Can any tell me is it possible to cast a Reader class in User defined Class

For e.x.
Suppose i have object of reader which have information of employee and i want to cast it in employee class object. Is it possible.

Thanks.

Posted 8-Jun-12 19:36pm

Varinder Raii

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Timberbird · Answer 1 · 2012-06-08T20:29:00

Solution 1

It's possible, but only when your reader is either descendant of Employee class or realizes the same interface:
1)

C#

public class Employee
{
...
}

public class Reader: Employee
{
...
}

2)

C#

interface IEmployee
{
...
}

public class Employee: IEmployee
{

...
}

public class Reader: IEmployee
{
...
}

Posted 8-Jun-12 20:29pm

Timberbird

Comments

Varinder Raii 9-Jun-12 2:35am

Here reader is SqlReader

Timberbird 9-Jun-12 2:46am

Well, it complicates things. I think you'll have to create a new class derived from SqlReader and add IEmployee interface realization to that class. Another option I initially forgot, you could overload cast operator, but that also requires new class derived from SqlReader to be created

Varinder Raii 9-Jun-12 5:41am

Actually i want to make a common method for master forms

which will retrieve data from database for all master forms. but problem is that

when reader retrieve data then how can i add this data to list.

For Ex.

Collapse | Copy Code

public static List<object> Retrieve(string TableName)
{
List<object> List = null;
using (var con = ClsCommon.ConnectionOpen())
{
using (var transaction = con.BeginTransaction())
{
string Qry = "Select * from "+TableName +"";
SqlCommand command = new SqlCommand(Qry ,con );
SqlDataReader Reader = command.ExecuteReader ();
if (Reader.HasRows )
{
while (Reader.Read ())
{
// Now here how can i add values from reader to List
}
}
}
}
return null;
}

I want to make a common method. is there any way for this problem. using Genric Class or any other thing.

Please help me i will be very thankful to you guys.