Question

With this code:

Dictionary<DateTime, double> FlowInformation = new Dictionary<DateTime, double>();

foreach (DateTime key in FlowInformation)
{
    if (initialialrec != 0)
    {
        if (FlowInformation[key] > initialialrec)
            flow = key.ToShortDateString() + " " + key.ToShortTimeString() + "+";

        if (FlowInformation[key] < initialialrec)
            flow = key.ToShortDateString() + " " + key.ToShortTimeString()+"-";

        initialialrec = FlowInformation[key];
        file.WriteLine(flow);
    }

    FlowInformation.Clear();                    
}

I get a compilation error:

Strategy\theFlowStrategy.cs Cannot convert type 'System.Collections.Generic.KeyValuePair' to 'System.DateTime'   

How can I iterate though this collection?

Answer 1

A Generic dictionary is a list of KeyValuePair items.

To loop on the keys (as you are trying to do), then loop on FlowInformation.Keys. You can also loop on the values directly using FlowInformation.Values.

The other thing you could do is to use KeyValuePair as your iteration variable type. That will save you having to do FlowInformation[key] to find out which value corresponds to your key, as the value will be in the .Value property of the iteration variable.