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IValueConverter does not fire when XamGrid is deserialized
posted

Dear community,

While I have worked with C# for a number of years now, I must admit that I am new to WPF + Infragistics controls.  If you have any insight, I would love to hear your thoughts on the following:

  1. The PersistenceManager is configured for the XamGrid using XAML. (see: [B] Persist Everything)
  2. application starts (for the first time)
  3. XamGrid is bound to a datasource
  4. binding includes a converter (see: [A] Column Binding )
  5. the converter works as expected
  6. user adjusts the size of the `Id` column
  7. data is serialized via: PersistenceManager.Save(IgPersistenceGroup);
  8. application closed
  9. application started (for the second time)
  10. XamGrid is derserialized via: PersistenceManager.Load(IgPersistenceGroup, _persistedData.IgPersistenceMemoryStream);
  11. XamGrid is bound to the data source
  12. new data is displayed as expected
  13. the converter is never called
  14. the `Id` column is the expected size

In this particular case, the XamGrid's entire object tree is being serialized/deserialized.  As a result, I suspect that my problem is related to:

  1. the bindings being serialized/deserialized, or
  2. the converter is being referenced as a StaticResource and that that reference no longer makes sense when the application starts for a second time
Practically speaking, there is no need to persist the entire XamGrid object tree.  So... I implemented [C] Persist Customized Values.  Even though the PersistenceManager is able to Save/Load the XamGrid without issue (no binding errors, no exceptions, etc.) , this scenario does not work - the `Id` column size will always revert back to it's original width when the application is launched (as defined in XAML).  
Thoughts?

ADDITIONAL CONTEXT

  • Infragistics controls version 12.1.20121.2286

SAMPLE CODE

[A] Column Binding

<ig:TemplateColumn.ItemTemplate>
   <DataTemplate>
      <Image HorizontalAlignment="Center" Width="16" Height="16" Source="{Binding Converter={StaticResource SourceToTargetConverter}}" />
   </DataTemplate>
</ig:TemplateColumn.ItemTemplate>

** SourceToTargetConverter: is not the converter's real name - the converter's name is irrelevant here

[B] Persist Everything

<ig:XamGrid ig:PersistenceManager.PersistenceGroup="{DynamicResource igPG}" 

<ig:PersistenceManager.Settings>
   <ig:PersistenceSettings SavePersistenceOptions="AllButIgnored" >
      <ig:PersistenceSettings.PropertySettings>
         <ig:PropertyNamePersistenceInfo PropertyName="FilteringSettings"/>
      </ig:PersistenceSettings.PropertySettings>
   </ig:PersistenceSettings>
</ig:PersistenceManager.Settings>

[C] Persist Customized Values

<ig:XamGrid ig:PersistenceManager.PersistenceGroup="{DynamicResource igPG}" 

<ig:PersistenceManager.Settings>
   <ig:PersistenceSettings SavePersistenceOptions="OnlySpecified" LoadPersistenceOptions="OnlySpecified">
      <ig:PersistenceSettings.PropertySettings>
         <ig:PropertyNamePersistenceInfo PropertyName="ColumnResizingSettings"/>
         <ig:PropertyNamePersistenceInfo PropertyName="ColumnMovingSettings"/>
         <ig:PropertyNamePersistenceInfo PropertyName="SortingSettings"/>
         <ig:PropertyNamePersistenceInfo PropertyName="ColumnChooserSettings"/>
         <ig:PropertyNamePersistenceInfo PropertyName="GroupBySettings" Options="Contains"/>
      </ig:PersistenceSettings.PropertySettings>
   </ig:PersistenceSettings>
</ig:PersistenceManager.Settings>

Sample code is from: XamGrid Persistence Settings
http://es.infragistics.com/community/forums/t/63366.aspx?PageIndex=1

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  • 225
    Verified Answer
    posted

    It appears that the TemplateColumn.ItemTemplate is not being serialized when the XamGrid is persisted using the ig:PersistenceManager. As a result:

    1. When the application starts for the first time, the TemplateColumn.ItemTemplate is loaded from BAML and the column is displayed with the appropriate formatting (using the supplied IValueConverter).
      • NOTE: you will be able to see the ItemTemplate using Visual Studio's debugger and theWatch window
    2. In the current configuration, the ig:PersistenceManager is explicitly setting the TemplateColumn.ItemTemplate to null when the XamGrid is being deserialized.
      • the reason why unformatted data is being displayed in the column is because the XamGrid is automatically falling back to the ig:TemplateColumn's Key to load data from the DataContext
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