Question

Lets say i have following class

public class abc
{
    int id;
    string name;
}

i am using this class as a collection of some data and my business logic appends some rows in it.

List<abc> lstData = GetData();

Now if i have to modify some property value lets say i want to modify the name property with some value.

string replaceName = 'jay';

so this jay should be in every row of the list in name property.

how to do this ? i think there is a convertAll method can we use that….

Answer 1

ConvertAll is usually used to create a new list, whereas it sounds like you just want to modify properties within existing objects. So I’d use:

foreach (abc value in lstData)
{
    value.name = replaceName;
}

(This code would look more idiomatic if you’d used names following the .NET naming conventions, by the way.)

Alternatively, you could use ConvertAll if you wanted to create new objects:

List<abc> newList = lstData.ConvertAll(old => new abc { 
    id = old.id,
    name = replaceName
});

That’s using a lambda expression for the delegate, and an object initializer to set the properties in each new object. The exact way that you’d approach this would depend on your real class.