• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 563
  • Last Modified:

Easy load a two dimensional array from a SqlDataReader

I want to read two columns from a SqlDataReader into a dynamic two-dimensional string array - or some way to easily persist the data so I can iterate through it. What is the best way to do this?

example:

var someCollection = new someCollection();
while (reader.Read()
{
   someCollection.Add(reader["col1"].ToString(),reader["col2"].toString());
}
0
purplesoup
Asked:
purplesoup
  • 3
  • 2
  • 2
  • +1
2 Solutions
 
klakkasCommented:
Why not put it in a Datatable and use this to iterate through your data?

0
 
Daniel Van Der WerkenIndependent ConsultantCommented:
There are bunches of ways to do this.  If you want a Key/Value pairing, you can use a HashTable.  Myself, I might create a struct with the values like:

public struct MyStruct
{
    string ColumnOneValue;
    string ColumnTwoValue;
}

List<MyStruct> myStructList = new List<MyStruct>();

Then, in the loop:

MyStruct ms = new MyStruct();
ms.ColumnOneValue = reader["col1"].ToString();
ms.ColumnTwoValue = reader["col2"].ToString();

and

if ( !myStructList.Contains( ms ) )
{
   myStructList.Add( ms ) );
}

or you could use a HashSet instead of a List.
0
 
Gururaj BadamCommented:
I'm proposing to use Anonymous Types if you don't to bother for the Type of each item. And also notice I'm not using .ToString() as it may throw exception if the value is null.
IList list = new List();
            while (reader.Read())
                list.Add(new { ColumnOne = (string)reader["col1"], ColumnTwo = (string) reader["col2"] });

Open in new window

0
Keep up with what's happening at Experts Exchange!

Sign up to receive Decoded, a new monthly digest with product updates, feature release info, continuing education opportunities, and more.

 
purplesoupAuthor Commented:
klakkas - yes a DataTable is an option, I'd like to understand what the other options are first before using it.

Dan7el - I don't want key/value pairing so no hashtable, I'd also rather not create a separate structure just to hold the values.

Novice_Novice - I was wondering about anonymous types, this might be the way to go, I'd like to use strong typing though with strings.

I'll keep this open a little longer and see if anything else comes up..
0
 
Gururaj BadamCommented:
It will be good to know your intent to help us understand better and suggest the best.
0
 
purplesoupAuthor Commented:
I'm iterating through a master/detail table relationship.
0
 
Gururaj BadamCommented:
No, actually I meant what you will do with this list?
0
 
klakkasCommented:
I will stick with the suggestion of the datatable for your problem purplesoup, for the following reasons:

1. It is easy to load the data to the datatable from the DataReader.
2. It is very easy to iterate through the data
3. You do not worry about datatypes, DataRowItem can contain anything.
4. Important: You can use the Datatable.Select method to either select some data off your datatable or even sort it automatically.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

  • 3
  • 2
  • 2
  • +1
Tackle projects and never again get stuck behind a technical roadblock.
Join Now