CODEWITHSUNDEEP
c#asp.net-3.5
Philly
Philly

Reputation: 251

compare two stringbuilders usng C#

Hi i have two string builders s1 and s2. I am assigning orders to that stringbuilder using comma separator. I want to compare two string builders. I want to know that all the orders in s1 are in s2 as well. If not i want know which order is missing in s2. How to achieve that?

if (!IsPostBack)
{
    int reccount = dsResult.Tables[0].Rows.Count;
    for (int count = 0; count < reccount;count++)
    {
        HashSet<string> arrayOrdId = new HashSet<string>();
        arrayOrdId.Add(dsResult.Tables[0].Rows[count][1].ToString());
        // arrayOrdId[count] = dsResult.Tables[0].Rows[count][1].ToString();
    }
}

Upvotes: 0

Views: 630

Answers (2)

Jon Skeet
Jon Skeet

Reputation: 1502816

I would suggest not using StringBuilder at all for this - instead, create two List<string> or possibly HashSet<string> to build up the order IDs, then compare those. If you need to create a string representation for other reasons, do that separately. (I'm assuming your order IDs are strings. If they're not, use the appropriate type of collection instead.)

It's not clear whether the order matters, but if it doesn't, HashSet<string> is what you should be using. You can find the differences easily enough:

var missingFromX = y.Except(x);
var missingFromY = x.Except(y);
// Do whatever you want with those differences

Upvotes: 7

Jodrell
Jodrell

Reputation: 35726

Somthing like

var orders1 = new HashSet<string>();
var orders2 = new HashSet<string>();

// add the orders to the sets, not stringbuilders, here

var order1sInOrders2 = orders1.Intersect(orders2);
var order2sNotInOrders1 = orders2.Except(orders1);

You might want to consider doing this straight on IEnumerables of some custom Order class rather than strings.

Upvotes: 1

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