[C#] ListView troubles

[RiZe]

Hi,
I have a ListView on my server's GUI which is filled with connected clients data and I have to keep this data fresh. For example add new item for new client connection or remove item of disconnected client etc. I wrote this:

/**
 * This fills the ListView with new data. Client is class with getter of
 * IP adress, client's ID, name and socket. Clients is a Hashtable filled 
 * by instances of Client class (HT Key is (Double)Id, Value (Client) 
 * new Client(...))
 * 
 * The first loop works fine, if the Client is not in LstvClients, it will be
 * added.
 */
foreach (IMServer.Core.Client Client in Clients.Values)
{
    ListViewItem ListItem   = new ListViewItem(Convert.ToString(Client.Id));
    ListItem.Name           = Convert.ToString(Client.Id);
    ListItem.SubItems.Add(Client.Name);
    ListItem.SubItems.Add(Client.IpAddress);
 
    if (!LstvClients.Items.ContainsKey(ListItem.Name))
    {
        LstvClients.Items.Add(ListItem);
    }
}
/**
 * But this not. It should remove the item of disconnected client 
 * (client isn't in Clients Hashtable, removed by server). This code
 * remove all clients from ListView.
 */
foreach (ListViewItem Item in LstvClients.Items)
{    
    if (!Clients.ContainsKey(Item.Name))
    {
        LstvClients.Items.Remove(Item);
    }
}
 

Thanks for any advice and sorry for my English,
RiZe

[joedeene]

So what exactly are you having trouble with? Are you not able to keep it updated? Are you even getting the items added successfully with the Clients ID or information you want. I just need to know what exactly you're having difficulties with.

joedeene

[RiZe]

First loop add new item to the ListView. The second loop should remove disconnected clients from ListView but it remove the new client too. I will describe on an example.

Application is running and server is listening, no client is connected (Hashtable Clients is clear), no item is in ListView. When client connect to the server, server create his own instance of Client class which is saved to Hashtable (Key (Double)Id of client, (Client) instance of Client class). The first loop will check ListView for clients and add new row with our client (ID 0). The second loop should check if some client disconnected from server and remove his row from ListView but it removes the row of our connected client too so when the client connect the ListView is empty, first loop added his row and the second removed it.

[RiZe]

I got it. ListView.Items.ContainsKey method pass through only String but I was using Double so the solution is converts the key values in Hashtable Clients to String.