C# 4 and .NET 4

OC92 ❘ ChaPTer 50 mAnAGed Add-in frAmewOrk
Calculate
code snippet HostAppWPF/CalculatorHostWindow.xaml
In the code-behind, the FindAddIns() method is invoked in the constructor of the Window. FindAddIns()
uses the AddInStore class to get a collection of AddInToken objects and pass them to the DataContext
property of the ListBox listAddIns for display. The first parameter of the AddInStore.FindAddIns()
method passes the abstract Calculator class, which is defined by the host view to find all add-ins from the
store that apply to the contract. The second parameter passes the directory of the pipeline that is read from
the application configuration file. When you run the sample application from the Wrox download site
(http://www.wrox.com), you have to change the directory in the application configuration file to match your
directory structure.
using System;
using System.AddIn.Hosting;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Windows;
using Wrox.ProCSharp.MAF.Properties;
namespace Wrox.ProCSharp.MAF
{
public partial class CalculatorHostWindow: Window
{
private Calculator activeAddIn = null;
private Operation currentOperation = null;
public CalculatorHostWindow()
{
InitializeComponent();
FindAddIns();
}
void FindAddIns()
{
try
{
this.listAddIns.DataContext =
AddInStore.FindAddIns(typeof(Calculator),
Settings.Default.PipelinePath);
}
catch (DirectoryNotFoundException ex)
{
MessageBox.Show("Verify the pipeline directory in the " +
"config file");
Application.Current.Shutdown();
}
}
//...
code snippet HostAppWPF/CalculatorHostWindow.xaml.cs
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