CODEWITHSUNDEEP
c#.netreflection
Rocky Singh
Rocky Singh

Reputation: 15430

How can I compare two classes base their methods?

I want to find out the missing properties in one class by comparing the other class

public class User
{
    public int UserID { get; set; }
    public string UserName { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

public class UserDTO
{

    public string UserName { get; set; }
    public string FirstName { get; set; }

}

Above I should get the output like "UserID, "LastName" properties are missing in UserDTO.

Upvotes: 0

Views: 127

Answers (2)

I4V
I4V

Reputation: 35353

var list = typeof(User).GetProperties().Select(x => x.Name)
           .Except(typeof(UserDTO).GetProperties().Select(y => y.Name))
           .ToList();

EDIT

Including suggestions in comments and public Fields

public static IEnumerable<string> Diff(Type t1, Type t2)
{
    return t1.GetProperties().Select(p1 => new { Name = p1.Name, Type = p1.PropertyType })
            .Concat(t1.GetFields().Select(f1 => new { Name = f1.Name, Type = f1.FieldType }))
            .Except(t2.GetProperties().Select(p2 => new { Name = p2.Name, Type = p2.PropertyType })
                    .Concat(t2.GetFields().Select(f2 => new { Name = f2.Name, Type = f2.FieldType })))
            .Select(a => a.Name);
}

Upvotes: 10

w5l
w5l

Reputation: 5746

Use reflection to get the properties, see Type.GetProperties. Then compare both property lists to find the missing ones.

var UserProperties = typeof(User).GetProperties().Select(p => p.Name);
var UserDTOProperties = typeof(UserDTO).GetProperties().Select(p => p.Name);

var missingProperties = UserProperties.Except(UserDTOProperties);

Take into account that all inherited properties will also be present in these lists, unless yous specify BindingFlags.DeclaredOnly to the GetProperties() method, see BindingFlags.

Upvotes: 7

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