New attribute binding

JeffRogholt — Fri, 06 Sep 2013 17:45:23 GMT

Not every graphic in our feature dataset has geometry and I'd like to add a column to the datagrid to identify this. Before assigning the feature layer to the datagrid graphics layer, I loop thru the graphics and add an attribute called "HasShape" and assign a value of "True" or "False" (string data type not boolean).

When I debug my code, the attribute list includes "HasShape" but this is the exception I get when I bind the data to the grid:
'HasShape' property not found on 'ESRI.ArcGIS.Client.Toolkit.DataSource.TempTypeMinus2021084955'

Here's the code I'm using to add the attribute:

Dim lyr As New ESRI.ArcGIS.Client.FeatureLayer lyr = CType(Mainpage.MyMap.Layers("MyFeatureLayer"), ESRI.ArcGIS.Client.FeatureLayer)  For Each item As ESRI.ArcGIS.Client.Graphic In lyr.Graphics     If item.Geometry Is Nothing Then       item.Attributes.Add("HasShape", "False")        Else       item.Attributes.Add("HasShape", "True")     End If Next  Mainpage.MyDataGrid.GraphicsLayer = Mainpage.MyMap.Layers("MyFeatureLayer")

I do NOT auto generate the datagrid's columns so here is my code to add the "HasShape" column:

        Dim col As New DataGridTextColumn         col.Binding = New Windows.Data.Binding("HasShape")         col.Header = "Has Shape"         col.Width = New DataGridLength(80.0)         col.IsReadOnly = True         MyDataGrid.Columns.Add(col)

Please let me know if this is possible or maybe there's a better way to identify if there's a geometry.

Thanks,
Jeff

Re: New attribute binding

DenisT — Sat, 07 Sep 2013 03:47:28 GMT

Try the following code:

col.Binding = New Windows.Data.Binding("Attributes[HasShape]")

Please let me know if this is possible or maybe there's a better way to identify if there's a geometry.

You can bind to the Geometry itself but use a custom IValueConverter implementation. Then the geometry changes will be tracked automatically.

Re: New attribute binding

DenisT — Sun, 08 Sep 2013 08:45:52 GMT

My fault, just noticed you were using FeatureDataGrid.

In that case you can add your new Field description to lyr.LayerInfo.Fields.
Not sure if there will be any side-effects during feature layer editing.

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