Simple .NET/ASP.NET PDF document editor web control SDK

private Record LoadRecord(int recordId) { ... Code to load the record would go here ... } private bool IsStale(Record result) { ... Code to work out whether the record is stale would go here ... }

}

private void DiscardAnyOldCacheEntries() { ... Cache removal policy code would go here ... }

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Figure 2-15. All widgets in a vertical layout You can find the list widget in the group item widgets in the widget box. Place it on the form in the middle of the free space. Then click on a free spot on the form, which selects the actual form. You can see that you have selected the actual form by looking at the Object

Notice that this code does not use the indexer to look up a cache entry. Instead, it uses a method called TryGetValue. You use this when you re not sure if the dictionary will contain the entry you re looking for in this case, the entry won t be present the first time we look it up. (The dictionary would throw an exception if we use the indexer to look up a value that s not present.) TryGetValue returns true if an entry for the given key was found, and false if not. Notice that its second argument uses the out qualifier and it uses this to return the item when it s found, or a null reference when it s not found.

You might be wondering why TryGetValue doesn t just use a null return value to indicate that a record wasn t found, rather than this slightly clumsy arrangement with a bool return value and an out argument. But that wouldn t work with value types, which cannot be null. Dictionaries can hold either reference types or value types.

for (int i = 1; i < nRows; i++) { ny = Convert.ToDouble(dtTable.Rows[i].ItemArray[1]); XDate tmpDate = new XDate( Convert.ToDateTime(dtTable.Rows[i].ItemArray[0])); nx = (double)tmpDate; pt.Add(nx, ny); }

We need to create a client program to talk to our service. Again, to keep things simple we ll make it a console application. We ll add this to the same solution, calling the project ChatClient. (Obviously, you ll need to stop the ChatHost program first if you re trying this out and it s still running in the debugger.) When you right-click on a project s References item in Visual Studio s Solution Explorer, you re offered an Add Service Reference menu item as well as the normal Add Reference entry. We re going to use that to connect our client to our server via WCF. The Add Service Reference dialog offers a Discover button (shown in Figure 13-6) which attempts to locate services in your current solution. Disappointingly, if we were to click it with our code as it is now, it would report that it didn t find any services. That s because we wrote all the hosting code by hand for ChatHost Visual Studio doesn t realize that our console application is hosting services. It usually looks only in web projects if we d hosted the service in an ASP.NET web application, it would have found it. But with the approach we re taking here, it needs a little help.

Inspector. When the dialog is chosen, you have the right selection. Now apply a grid layout by clicking the appropriate button in the toolbar. Applying a layout when having selected a widget containing other widgets applies that layout to the form (layout is an attribute of the parent widget, not the children within it). Figure 2-16 shows the form after the list widget has been added, and Figure 2-17 shows the form after the layout has been applied.