/// <summary>
/// The format of the query information and the desired UI will usually depend on the Linq to SQLq provider
/// used by the query.
/// Therefore in this general query visualizer we only read the assembly and class for the specific
/// query visualizer from the Stream and call the method "Display" on this class, which in turn will
/// read the query information and show the UI.
/// </summary>
/// <param name="windowService"> used to display the UI </param>
/// <param name="objectProvider"> used to retrieve the data (as Stream) from the visualizer proxy</param>
protected override void Show(IDialogVisualizerService windowService, IVisualizerObjectProvider objectProvider)
{
Stream rawStream = objectProvider.GetData();
//call visualizer to serialize query info
Visualizer qv = new Visualizer();
qv.Display(windowService, rawStream);
}
/// <summary>
/// The unit tests will use this static version
/// </summary>
/// <param name="target"></param>
/// <param name="outgoingData"></param>
public static void SerializeTheQuery(object target, Stream str)
{
// get query
IQueryable query = target as IQueryable;
if (query == null) {
Error(str, "Query visualizer invoked on non-IQueryable target.");
return;
}
//get provider
Type tQueryImpl = query.GetType();
FieldInfo fiContext = tQueryImpl.GetField("context", BindingFlags.NonPublic | BindingFlags.Instance);
if (fiContext == null) {
Error(str, "Query field 'context' not found in type " + tQueryImpl.ToString() + ".");
return;
}
Object objProvider = fiContext.GetValue(query);
if (objProvider == null) {
Error(str, "Query field 'context' returned null.");
return;
}
System.Data.Linq.DataContext dataContext = objProvider as System.Data.Linq.DataContext;
if (dataContext == null) {
Error(str, "Query is not against a DataContext.");
return;
}
//call visualizer to serialize query info
//object objVisualizer = Activator.CreateInstance(providerVisualizerType);
//SourceChooser iVisualizer = objVisualizer as IProviderQueryVisualizer;
Visualizer objVisualizer = new Visualizer();
BinaryFormatter formatter = new BinaryFormatter();
objVisualizer.StreamQueryInfo(dataContext, query, str);
}