Question

I have a simple class like this:

class QuickReport
{
    public string DeviceName { get; set; }
    public string GroupName { get; set; }
    public string PinName { get; set; }

    public override string ToString()
    {            
        return DeviceName + "," + GroupName + "," + PinName;
    }
}

Later I make a list of items with this class:

List<QuickReport> QR = new List<QuickReport>();

Later in my program it will fill up and when I save it in a text file it will be like this example:

HBM\D1,GND,10
HBM\D1,GND,12
HBM\D1,NT_IOp,115
HBM\D1,NT_IOp,117
HBM\D2,GND,8
HBM\D2,NT_IOp,115
HBM\D2,NT_IOp,116

Now I want to make a function to save the text file in more readable manner. That is formatting it by DEVICE, GROUPS and PINS. So the above example would result in:

HBM\D1
GND: 10, 12
NT_IOp: 115, 117

HBM\D2
GND: 8
NT_IOp: 115, 116

can you please help and give some ideas?

Thanks!

Answer 1

var query = QR.ToLookup(i=>i.DeviceName, i => new {i.GroupName, i.PinName})
              .Select(i=> 
                     new {DeviceName = i.Key, 
                          Groups = i.ToLookup(g=>g.GroupName, g=>g.PinName)});

        var sb = new StringBuilder();
        foreach ( var device in query)
        {
            sb.AppendLine(device.DeviceName);
            foreach ( var gr in device.Groups)
            {
               sb.Append(gr.Key + ": ");
               sb.Append(String.Join(", ", gr.ToArray()));
               sb.AppendLine();
            }
            sb.AppendLine();
        }
        var stringToWrite = sb.ToString();