Read property value from observablecollection

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I have a

C#

ObservableCollection<Owner> currentOwner

which has only one record in it.

C#

public int OwnerID { get; set; }
public string FirstName { get; set; }
public string MiddleName { get; set; }
public string LastName { get; set; }
public char Gender { get; set; }
public DateTime DateOfBirth { get; set; }

C#

DataTable ownerDataTable = new DataTable();
ownerDataTable = ownerDataOperations.Stash_GetOwnerDA(owner, ownerLogin);
currentOwner = new ObservableCollection<Owner>();

foreach (DataRow row in ownerDataTable.Rows)
{
  currentOwner.Add(new Owner()
  {
    OwnerID = (int)row["OwnerID"],
    FirstName = (string)row["FirstName"],
    MiddleName = (string)row["MiddleName"],
    LastName = (string)row["LastName"],
    Gender = (char)row["Gender"],
    DateOfBirth = DateTime.Parse(row["DateOfBirth"].ToString())
 });
}

I just want to get the OwnerID property value from the one record that exists in the collection without using loops.

What I have tried:

I tried LINQ but I know too little about it.

Posted 1-Feb-23 7:22am

Christopher Fernandes

Updated 1-Feb-23 20:10pm

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Member 15627495 1-Feb-23 15:43pm

you are lost between 'JSON syntax', and 'members of an Array' and 'OOP'.

the way you load 'currentOwner.add(...)', you're using recursion when : the_var = (type)row[...]
the row[...] is allocated in 'the_var' , then 'the_var' is allocated as members of the array of object Owner.

for OOP , you have to use 'this.OwnerId = row [...]' to fill your object values .

sure your can read your collection with 'n-dimension indexes' -> obsColl[0][0] ( for the first record )

as advise, read again about 'Class' in C# , with 'getters' and 'setters', you'll find the good syntax for your needs.

[no name] 1-Feb-23 17:44pm

If there's only "one record", don't put it in a collection. If you have a collection, you can retrieve the "single" using .First() and assign it to a variable so you can access it directly.

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George Swan · Accepted Answer · 2023-02-01T20:10:00

It seems to me that you have, at least, three options.

C#

Owner bob = new() { LastName = "Builder", OwnerID = 1 };
ObservableCollection<Owner> currentOwners = new() { bob };
//will throw ArgumentOutOfRange exception if the collection is empty
int idFromIndex = currentOwners[0].OwnerID;
//will return 0 if the collection is empty so it's best not to zero base identity Ids
int idFromLinq = currentOwners.Select(owner => owner.OwnerID).FirstOrDefault();
//will throw InvalidOperationException if the collection is empty.
int idFromLinqA = currentOwners.Select(owner => owner.OwnerID).First();