Query a list for multiple items

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I have the following:

C#

public class DeviceListItem
{
    public DeviceListItem();
    public string AssignedLot { get; set; }
    public string ID { get; set; }
}

The list can contain
1. Only one item such as ID-001 and Lot-AA
2. Multiple items with different ID's but common Lots, such as ID-001 with LOT-AA and ID-002 with LOT-AA
3. Multiple items with different ID's and different Lots, such as ID-001 with LOT-AA and ID-002 with LOT-BB

I also have the following function that returns a string

C#

private string generateErrorMessage(List<DeviceListItem> mixedDeviceList)
{
 string error = string.Empty;
 // If only 1 device - "Device [<ID>] does not belong to this lot.  It belongs to lot [<Lot>]."
 if (mixedDeviceList.Count == 1)
 error = "Device" + mixedDeviceList[0].ID + " does not belong to this lot. It belongs to lot " + mixedDeviceList[0].AssignedLot;

 // Multiple, same Lot - "There are <n> devices from lot [<Lot>] mixed with the current lot."
 // Multiple, multiple - "There are <n> devices from multiple lots mixed with the current lot."
return error;
}

I need to query the list and build the appropriate string to be returned for the remarked code above.

Any solutions ?

What I have tried:

Tried to do something using Linq but no sucess

Posted 25-Aug-16 5:02am

datt265

Updated 25-Aug-16 5:39am

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Richard Deeming · Accepted Answer · 2016-08-25T05:39:00

Easy to do with LINQ:

C#

if (mixedDeviceList.Count == 1)
{
    return string.Format("Device {0}  does not belong to this lot. It belongs to lot {1}.", mixedDeviceList[0].ID, mixedDeviceList[0].AssignedLot);
}

string firstLot = mixedDeviceList[0].AssignedLot;
bool multipleLots = mixedDeviceList.Skip(1).Any(d => d.AssignedLot != firstLot);

if (multipleLots)
{
    return string.Format("There are {0} devices from multiple lots mixed with the current lot.", mixedDeviceList.Count);
}

return string.Format("There are {0} devices from lot [{1}] mixed with the current lot.", mixedDeviceList.Count, firstLot);

Or, if you'd prefer to avoid LINQ:

C#

if (mixedDeviceList.Count == 1)
{
    return string.Format("Device {0}  does not belong to this lot. It belongs to lot {1}.", mixedDeviceList[0].ID, mixedDeviceList[0].AssignedLot);
}

string firstLot = mixedDeviceList[0].AssignedLot;

bool multipleLots = false;
for (int index = 1; index < mixedDeviceList.Count; index++)
{
    if (mixedDeviceList[index].AssignedLot != firstLot)
    {
        multipleLots = true;
        break;
    }
}

if (multipleLots)
{
    return string.Format("There are {0} devices from multiple lots mixed with the current lot.", mixedDeviceList.Count);
}

return string.Format("There are {0} devices from lot [{1}] mixed with the current lot.", mixedDeviceList.Count, firstLot);