Hi,

I'm having the same problem and the sample solution doesn't work for me. I have a xamdatagrid whose underlying datasource type changes dynamically at run time. The fields will change but I need to keep the same FieldLayout (they are in the same hierarchy and I need to hide some common fields that would be of no interest to the user.) I have a fieldlayout set as per the sample project but this is unfortunately only used the first time the grid is rendered and never again. I need to apply the FieldLayout every time the grid renders, but am struggling. Any help would be greatly appreciated!

Thanks,

Ben

Ben -

1) I worked on this code over 3 years ago.  Anything I share may be outdated or no longer compatible with latest XamDataGrid.

2) Although I didn't want to, the only solution I found that consistently worked was to make deep copies of all the fields in the original field layout and copy them into a new field layout.

3) This code may not be efficient or optimized.  Use at your own risk.  I'm sharing it to give you an idea of what I did to get things to "work".

Because I wanted a bindable XamDataGrid (I was using Caliburn Micro and wanted two-way data binding), I extended XamDataGrid.  I then created a MaintainDefaultFieldLayout XAML property.  Finally, I overrode OnFieldLayoutInitializing.  

Attached is the code for BindableXamDataGrid (note other methods used to help two-way data bind data, note I also think there was an issue with Tooltips which explains some of the other Tooltip override logic).  You will need to add in the correct using statements and there may be some "application" specific code from my app that you will need to remove because it won't exist in your app and you won't have the projects or DLLs.

To use it in XAML, just define the grid as a normal XamDataGrid but set the MaintainDefaultFieldLayout to true and define the FieldLayouts property:

<local:BindableXamDataGrid x:Name="TestUsersGrid"
Theme="Office2k7Black"
Grid.Row="1"
Grid.Column="2"
Grid.RowSpan="3"
MinWidth="250"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
MaintainDefaultFieldLayout="True"
DataSource="{Binding RoleUsersMatrix}"
SelectedRecordsDataItems="{Binding SelectedAssignedUsers}"
UseFieldLabelsForToolTips="True">

Also, in the BindableXamDataGrid, I use an extension method CloneWithNetDataSerializer.  Here is that definiton which creates a clone of an object using the built-in .Net Data Serializer to ensure the "copied" LayoutFields exactly match the properties of the fields defined in XAML:

/// <summary>
/// Perform a deep Copy of the object using standard serialization. Object being
/// cloned must be ISerializable
/// </summary>
/// <typeparam name="T">The type of object being copied.</typeparam>
/// <param name="source">The object instance to copy.</param>
/// <returns>The copied object.</returns>
public static T CloneWithNetDataSerializer<T>(this T source)
{
// Don't serialize a null object, simply return the default for that object
if (Object.ReferenceEquals(source, null))
{
return default(T);
}

string obj = CloneExtensions.NetDataSerializeObject<T>(source);

if (Object.ReferenceEquals(obj, null))
return default(T);
else
return CloneExtensions.NetDataDeserializeObject<T>(obj);
}

Hope this helps,

Nate