CODEWITHSUNDEEP
c#generics
Yash Saraiya
Yash Saraiya

Reputation: 1055

Combining ViewStates in C# OR combining generic lists in C#

I have the following two ViewStates 1 storing all the start dates and the other storing all the End dates of a particular event:

private List<DateTime> SelectedStartDates
    {
        get
        {
            if (ViewState["SelectedStartDates"] != null)
                return (List<DateTime>)ViewState["SelectedStartDates"];

            return new List<DateTime>();
        }
        set
        {
            ViewState["SelectedStartDates"] = value;
        }
    }

    private List<DateTime> SelectedEndDates
    {
        get
        {
            if (ViewState["SelectedEndDates"] != null)
                return (List<DateTime>)ViewState["SelectedEndDates"];

            return new List<DateTime>();
        }
        set
        {
            ViewState["SelectedEndDates"] = value;
        }
    }

Question:

Is there a way in which I can have a combined List of values stored in these two ViewStates in the following manner:

List[0] = first value of Start date

List[1] = first value of End date

List[2] = second value of Start date

List[3] = second value of End date

.

.

.

and so on till the last value of both the Lists in the ViewState.

The other way I can think of is to combine the Generic List returned by the ViewState again in a manner as mentioned above.

Also, I would like to keep the duplicate values in the combined list

Is there a work-around for this?

Upvotes: 1

Views: 78

Answers (2)

NoName
NoName

Reputation: 8025

You can do like this:

List<DateTime> combine = new List<DateTime>();
for (int i = 0; i < SelectedStartDates.Count; i++)
{
    combine.Add(SelectedStartDates[i]);
    combine.Add(SelectedEndDates[i]);
}

If two input lists is List<string> type, and each items in these lists are valid DateTime (for example, it item is inserted by (DateTime).ToString() function), you can use:

List<string> SelectedStartDates = new System.Collections.Generic.List<string>();
List<string> SelectedEndDates = new System.Collections.Generic.List<string>();

List<DateTime> combine = new List<DateTime>();
for (int i = 0; i < SelectedStartDates.Count; i++)
{
    combine.Add(DateTime.Parse(SelectedStartDates[i]));
    combine.Add(DateTime.Parse(SelectedEndDates[i]));
}

You you're not sure about if a string is valid DateTime format or not, you can use DateTime.TryParse.

You can read about:

Upvotes: 2

Cetin Basoz
Cetin Basoz

Reputation: 23797

If you want to have it like you said, up until the minimum count of both lists, then you can use the Zip() method. ie:

SelectedStartDates.Zip( SelectedEndDates, (s, e) => new 
   {Start = s, End = e});

Upvotes: 1

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