Add a List<object> into an object.Array

Question

I have a simple way to put 2 known profiles in my profileArray list as shown below:

Parameters params = new Parameters();
params.plist = new Plist();
params.plist.profileArray = new[]
        {
            new Profile{name = "john", age = 12, country = "USA"},
            new Profile{name = "Brad", age = 20, country = "USA"}
        };

Now i have a

List<Profiles> UserProfiles

which has a bunch of profiles in it.

How do i add this list to params.plist.profileArray?

Any help is appreciated.

Thanks.

This is what is in UserProfile:

List<Profiles> UserProfiles 
foreach(Profiles userProfile in UserProfiles)
{
string name = userProfile.Name;
string age = userProfile.Age;
string country = userProfile.Country;
string sex = userProfile.Sex;
string isMarried = userProfile.IsMarried;
}

Array is fixed-size. You cannot add items to it. You can allocate new, bigger one and make plist.profileArray reference that new array. — MarcinJuraszek
– MarcinJuraszek, Commented Mar 3, 2014 at 22:54
I was not too sure of the title. If it does not sound correct please can someone correct it. Thanks — user175084
– user175084, Commented Mar 3, 2014 at 22:55
Please put that in the answers so that if it works for me i can mark it. — user175084
– user175084, Commented Mar 3, 2014 at 22:56
I think you should use more appropriate names for your variables.params is a speacial keyword. — Selman Genç
– Selman Genç, Commented Mar 3, 2014 at 23:05

Tim Schmelter · Accepted Answer · 2014-03-03 23:14:19Z

3

You can use Enumerable.ToArray:

params.plist.profileArray = UserProfiles.ToArray();

If you want to add the list to the array, an array cannot be modified, you have to create a new one, for example by using Enumerable.Concat:

var newProfile = params.plist.profileArray.Concat(UserProfiles);
params.plist.profileArray = newProfile.ToArray();

Since these are two different classes with similar properties:

var profiles = UserProfiles
   .Select(up => new Profile{name = up.Name, age = up.Age, country = up.Country});
var newProfile = params.plist.profileArray.Concat(profiles);
params.plist.profileArray = newProfile.ToArray();

edited Mar 3, 2014 at 23:14

answered Mar 3, 2014 at 22:55

Tim Schmelter

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2 Comments

user175084 Over a year ago

Please have a look at my edit. Maybe i was not too clear before. Thanks

Rodrigo Silva Over a year ago

If you know the type of the the data, why not use a List instead of an array? Since you are actually converting it from one to the other. Also, how does this not work as you expected? It seems fine.

Enigmativity · Accepted Answer · 2014-03-04 00:01:58Z

1

Try this:

params.plist.profileArray = UserProfiles.ToArray();

How about this?

params.plist.profileArray =
    UserProfiles
        .Select(up => new
        {
            name = up.Name,
            age = up.Age,
            country = up.Country,
        })
        .ToArray();

edited Mar 4, 2014 at 0:01

answered Mar 3, 2014 at 22:55

Enigmativity

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1 Comment

user175084 Over a year ago

I have a lot of other values in user profiles along with name, age and country. I don't think it will work

Nicholas Carey · Accepted Answer · 2014-03-03 23:00:53Z

0

Try

params.plist.profileArray = params
                            .plist
                            .profileArray
                            .Concat( UserProfiles )
                            .ToArray()
                            ;

answered Mar 3, 2014 at 23:00

Nicholas Carey

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Comments

Arjan Einbu · Accepted Answer · 2014-03-03 23:16:12Z

0

Since you're using an array (and arrays in C# are of fixed size), you'l need to create a new array with the combined data.

There are several ways to do this, the simplest would probably be something like this:

var newList = new List<Profile>();
newList.AddRange(params.plist.profileArray);
newList.AddRange(UserProfiles);

params.plist.profileArray = newList.ToArray();

If can you change the implementation of Plist, I would recommend changing the array to a List<Profile>. Then the code would look like this instead:

params.plist.profileArray.AddRange(UserProfiles);

edited Mar 3, 2014 at 23:16

answered Mar 3, 2014 at 22:58

Arjan Einbu

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