C#

Bernhard Hiller wrote:

But does it really reconnect automatically?

1. When the client first connects, it sends a unique value that helps identification (since SignalR connectionIds are not persistent).
2. This is saved in dictionary with value as true (for connected).
3. When the client is disconnected, the value is set to false.
4. When the notification is sent from server to client, we check if there is any client with value as false in the dictionary. If yes, we save the client identifiers.
5. Next time they connect, the notification is sent again.

1. Drone notes all the dogs available.
2. If any dogs runs away to eat grass or whatever, it makes note of that too.
3. If a wolf is noticed, all dogs are notified. Drone also knows one dog is not there and will need to notify this dog later.
4. As soon as dog is back, it is send message.
5. If any new dog joins in, that too gets the message.

Bernhard Hiller wrote:

We have to take care of a flock of sheep. A shepherding drone is hovering over the area and searching for wolves. After detection of a wolf, it will notify the dogs and tell them where the wolves are etc. In most case there is one drone and one dog, but sometimes there may be many. With some trees around, the connection between the drone and the network may get disrupted.

An alternative solution is the dogs querying the drone's LastWolfDetected property in short intervals. Or the drones sending the LastWolfDetected message to a server, and the dogs query the server.
Anyway, the dogs must be informed reliably.

[TestFixture]
public class UpdatestdinfoTests : Updatestdinfo

Sam 9100 wrote:

try { valueAsNumber = int.Parse(value.Value.ToString()); }
catch { }

if (!Int32.TryParse(Convert.ToString(value.Value), out valueAsNumber)
  valueAsNumber = 0; 

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]

int? valueAsNumber = null; shows null

/// <summary>
/// Parse a set of values into an instance of tbl_Mine_MineGroup using Reflection
/// </summary>
public static tbl_Location ParseLocation(IOrderedDictionary values)
{
  tbl_Location locFromValues = new tbl_Location();
  Type locType = typeof(tbl_Location);    // we KNOW this
            
  // use reflection to update properties, because I'm lazy
  foreach (DictionaryEntry value in values)
  {
    string key = value.Key as string;
    if (key == null)
      throw new InvalidOperationException(string.Format("Key is not a string: {0}", value.Key);
    string val = value.Value as string;
    bool emptyValue = string.IsNullOrEmpty(val);
    object storableValue = null;

    if (key.Equals("Latitude") || key.Equals("Longitude"))
    {
      double parsed;
      // if the parse fails treat it the same as empty and leave storableValue null
      if (!emptyValue && double.TryParse(val, out parsed))
        storableValue = parsed; 
    }
    else if (key.Contains("ID"))
    {
      int parsed;
      // if the parse fails treat it the same as empty and leave storableValue null
      if (!emptyValue && int.TryParse(val, out parsed))
        storableValue = parsed; 
    }
    else
    {
      storableValue = val;
    }
    // storableValue has null or the "boxed" values of the parsed numeric values or the string
    // this is equivalent to using double? and int? above
    locType.GetProperty(key).SetValue(locFromValues, storableValue);
  }
 
  return locFromValues;
}