private void FieldDescriptionsProvider_GetDescriptionsDataAsyncCompleted(object sender, GetDescriptionsDataCompletedEventArgs e)
{
var filedDescriptionProvider = sender as IFieldDescriptionProvider;
this.StopListeningForGetDescriptionsData(filedDescriptionProvider);
IDataProvider provider = this;
if (provider.FieldDescriptionsProvider != filedDescriptionProvider)
{
return;
}
if (e.Error == null)
{
this.descriptionsData = e.DescriptionsData;
this.InitializeDescriptions();
this.OnStatusChanged(new DataProviderStatusChangedEventArgs(DataProviderStatus.DescriptionsReady, false, null));
if (this.refreshRequested)
{
this.Refresh();
}
}
else
{
this.OnStatusChanged(new DataProviderStatusChangedEventArgs(DataProviderStatus.Uninitialized, false, e.Error));
}
}
protected void RefreshFieldDescriptions()
{
this.descriptionsData = null;
IDataProvider provider = this as IDataProvider;
if (this.FieldDescriptionsReadyForUpdate)
{
this.OnStatusChanged(new DataProviderStatusChangedEventArgs(DataProviderStatus.Initializing, false, null));
provider.FieldDescriptionsProvider.GetDescriptionsDataAsyncCompleted += this.FieldDescriptionsProvider_GetDescriptionsDataAsyncCompleted;
provider.FieldDescriptionsProvider.GetDescriptionsDataAsync(this.State);
}
}
public void GetDescriptionsDataAsync()
{
Exception ex = null;
try
{
this.GetDescriptionsDataAsync(null);
}
catch (Exception e)
{
ex = e;
this.data = new EmptyFieldInfoData();
}
this.OnDescriptionsDataCompleted(new GetDescriptionsDataCompletedEventArgs(ex, null, this.data));
}
protected void RefreshFieldDescriptions()
{
this.descriptionsData = null;
IDataProvider provider = this;
if (this.FieldDescriptionsProvider != null && !this.FieldDescriptionsProvider.IsBusy)
{
if (this.ItemsSource != null)
{
this.OnStatusChanged(new DataProviderStatusChangedEventArgs(DataProviderStatus.Initializing, false, null));
provider.FieldDescriptionsProvider.GetDescriptionsDataAsyncCompleted += this.FieldDescriptionsProvider_GetDescriptionsDataAsyncCompleted;
}
provider.FieldDescriptionsProvider.GetDescriptionsDataAsync(this.State);
}
}
private void GetDescriptionsData()
{
Exception error = null;
try
{
this.IsBusy = true;
this.data = this.GenerateDescriptionsData();
}
catch (Exception e)
{
error = e;
this.data = new EmptyFieldInfoData();
}
finally
{
this.OnDescriptionsDataCompleted(new GetDescriptionsDataCompletedEventArgs(error, this.CurrentState, this.data));
}
}
internal static void UpdateFilterMemberAccess(IFieldInfoData data, IEnumerable <FilterDescriptorBase> descriptors)
{
foreach (var filterDescriptor in descriptors)
{
var propertyFilterDescriptor = filterDescriptor as PropertyFilterDescriptor;
if (propertyFilterDescriptor != null)
{
IDataFieldInfo field = data.GetFieldDescriptionByMember(propertyFilterDescriptor.PropertyName);
if (field != null)
{
propertyFilterDescriptor.MemberAccess = field as IMemberAccess;
}
}
else
{
var compositeFilter = filterDescriptor as CompositeFilterDescriptor;
if (compositeFilter != null)
{
UpdateFilterMemberAccess(data, compositeFilter.Descriptors);
}
}
}
}
private static void InitializeMemberAccess(IEnumerable <DescriptionBase> descriptions, IFieldInfoData fieldInfoData)
{
IMemberAccess access;
foreach (var item in descriptions)
{
access = fieldInfoData.GetFieldDescriptionByMember(item.GetMemberName()) as IMemberAccess;
if (access != null)
{
item.MemberAccess = access;
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="GetDescriptionsDataCompletedEventArgs"/> class.
/// </summary>
public GetDescriptionsDataCompletedEventArgs(Exception error, object userState, IFieldInfoData data)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
this.DescriptionsData = data;
this.Error = error;
this.State = userState;
}
public override void GetDescriptionsDataAsync(object state)
{
this.data = this.ActionToExecuteAsync();
}
