Linq to Compare 2 Objects

Question

I have two objects.

public class GlobalSettings
{
    public bool A { get; set; }
    public bool B { get; set; }
    public bool C { get; set; }
    public bool D { get; set; }
}

public class UserSettings
{
    public bool A { get; set; }
    public bool B { get; set; }
    public bool C { get; set; }
    public bool D { get; set; }
}

I need to compare these two objects. Depend on the property values of GlobalSettings i need to remove the property from UserSettings.

For eg.

From GlobalSettings property A value is false means i want to remove that property from UserSettings. Then i need to remove propery A from UserSettings like below.

public class UserSettings
{
    public bool B { get; set; }
    public bool C { get; set; }
    public bool D { get; set; }
}

Is it possible to do this linq?

Following post might be helpful to you. http://stackoverflow.com/questions/947241/how-do-i-create-dynamic-properties-in-c — lerner1225, May 15 '13 at 10:16
You can't delete code by using that same code, it doesn't make any sense. Do you want to do something like, relate the two, and use global settings' property if it is set, and user settings if it isn't? — Colm Prunty, May 15 '13 at 10:16

score 1 · Accepted Answer · answered May 15 '13 at 10:13

If you really wanted to automate this you could using Linq and reflection - e.g.

  var query = from aProp in a.GetType().GetProperties()
              let aValue = aProp.GetValue(a)
              let bProp = b.GetType().GetProperty(aProp.Name)
              let bValue = bProp.GetValue(b)
              where !aValue.Equals(bValue)
              select new { aProp.Name, aValue, bValue };

  var allTheSame = !query.Any();

score 1 · Answer 2 · answered May 15 '13 at 10:16

Given the 'Remove' part of your question, I think you will be much better off using a Dictionary rather than a Type for your settings.

You can't remove properties from normal static C# Types, but you can easily remove entries from Dictionaries using the Remove(key) method.

score 0 · Answer 3 · answered May 15 '13 at 10:32

Try something like this: UserSettings inherits from GlobalSettings and in this example, if you use UserSettings.A, if will check if that is false in its parent class, and use UserSettings.A if it is false, and GlobalSettings.A if it's true.

public class GlobalSettings
{
    public virtual bool A { get; set; }
}

public class UserSettings : GlobalSettings
{
    public override bool A 
    { 
        get 
        { 
            return base.A  ? base.A : A;
        }
        set
        {
            this.A = value;
        }
    }
}

Linq to Compare 2 Objects

3 Answers3