barcode in asp net core

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Whenever a new log entry generated, the syslogd daemon will append that entry into the messages file The entry takes on the following syntax: date time hostname message where date and time holds the date and timestamp when the event happened The hostname contains the hostname of this machine, and message is the information about the event An example log entry is shown in Listing 8-1 Listing 8-1 A Log Entry in the Messages File May 16 11:11:33 localhost avahi-daemon[4355]: Registering new address record for 192168111 on eth0 You can see here that the log was made on May 16 at 11:11:33 am You can also see that the time is in timestamp format, which includes seconds for accuracy of the entry The log entry was generated by this computer, localhost, using the avahi-daemon service with the process number 4355 used to identify that.

There s one glaring omission: the ListView isn t showing any data. And that s because, as mentioned previously, it doesn t have built-in support for data binding. We re going to need to write some code. Fortunately, it s relatively straightforward the binding source raises events to let us know whenever something has changed. If you select the entriesSource item in the form s design view and then go to the Properties panel and select the lightning bolt symbol to show the available events, there s a ListChanged event. We can add a handler by double-clicking that event. We expect three kinds of changes in the application addition of new items, updates to existing items, and deletion of existing items so we ll be writing three methods to handle that. The change event argument tells us which kind of change we re getting, so we just pick the relevant method based on the change type, as Example 22-3 shows.

private void entriesSource_ListChanged(object sender, ListChangedEventArgs e) { switch (e.ListChangedType) { case ListChangedType.ItemAdded: MakeListViewItemForNewEntry(e.NewIndex); break; case ListChangedType.ItemDeleted: RemoveListViewItem(e.NewIndex); break; case ListChangedType.ItemChanged: UpdateListViewItem(e.NewIndex); break;

The last part is the reason why this log entry has been recorded: this log was made to inform the administrator that the avahi-daemon assigned the IP address for this machine to 192168111 on the first.

}

}

In this chapter, to make the IfElse activities easier to change, you re going to remove the CodeConditions from all the IfElse activities within the Purchase Order application and replace them with Declarative Rule Conditions. By doing this, if the workflow was in production, the rules could be changed on the fly without needing to redistribute the application or even rebuild the application. Instead, the rules file could be changed. To begin, open the VBPurchaseOrderConsole application. Open the PurchaseOrderProcess workflow and click each of the left and right branches of the various IfElse activities. Change the Condition property to None for now. After you change the CodeCondition to None, you ll see a red exclamation point appear near that branch of the IfElse activity, as shown in Figure 5-17.

You might be wondering why we are asking the binding source to tell us when items have been added and changed, when we re writing the code that adds and changes items in the first place. The main reason is that there are certain tricky cases, such as what happens if you have an event handler for a text box s TextChanged event that runs as a result of a data-binding-related change, but which in turn causes further data binding changes; it s easy to tie yourself in knots, or end up with code that s rather fragile because it depends on things happening in a specific order. But if we just perform updates when the data binding system tells us to (via the events that BindingSource raises) things tend to run more smoothly. Let s start with the code that handles the addition of a new entry. We need to create a new ListViewItem for the list and ensure that it contains two columns. Since a new ListViewItem already has one column by default, we need to add a second one, as Example 22-4 shows. And then we just insert it into whatever position the binding source said it was added to in this application we always expect that to be the end, but since we re given a specific index, we may as well use it.

hardware network card, eth0. For developers of the avahi-daemon, the number inside the square brackets (4355) may be of interest because that is the process ID of the service. That can be used as an aid for fixing problems, if there are any.

private void MakeListViewItemForNewEntry(int newItemIndex) { ListViewItem item = new ListViewItem(); item.SubItems.Add(""); entriesListView.Items.Insert(newItemIndex, item); }

This code doesn t bother to provide values for the newly created item, because the binding source immediately follows a new item notification with an item change notification. So by putting code to update the list view item in the change notification handler, shown in Example 22-5, we cover two cases: new items and changes to existing items.

private void UpdateListViewItem(int itemIndex) { ListViewItem item = entriesListView.Items[itemIndex]; ToDoEntry entry = entries[itemIndex]; item.SubItems[0].Text = entry.Title; item.SubItems[1].Text = entry.DueDate.ToShortDateString(); }

Note: The source machine that generated the log entry is not only limited to your computer, localhost. It is

Finally, Example 22-6 shows the code for handling deleted items. We ve not added the code to perform deletions yet, but we need this method in place for Example 22-3 to compile.

private void RemoveListViewItem(int deletedItemIndex) { entriesListView.Items.RemoveAt(deletedItemIndex); }