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I can order an ordered dictionary by date

I have a dictionary where key is date and value is object. do i exist anyway, i can guarantee that when i go through this collection in chronological order always even after adding and removing items.

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You need to use SortedDictionary



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You can use LINQ:



foreach(var kvp in dictionary.OrderBy(kvp => kvp.Key)) {
    //Use kvp.Key and kvp.Value
}
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You can use SortedList: http://msdn.microsoft.com/en-us/library/ms132319.aspx
or SortedDictionary: http://msdn.microsoft.com/en-us/library/f7fta44c.aspx

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