Lightswitch: Get multi-selected items from DataGrid

This allows you to access all the selected items in the grid instead of just one (the SelectedItem property)

private const string Grid = "gridname";
private DataGrid _gridControl = null;

partial void Screen_InitializeDataWorkspace(List<IDataService> saveChangesTo)
{      
    this.FindControl(Grid).ControlAvailable += 
                     new EventHandler<ControlAvailableEventArgs>(Grid_ControlAvailable);
  
}

void Grid_ControlAvailable(object sender, ControlAvailableEventArgs e)
{
    _gridControl = e.Control as DataGrid;
 
    if (_gridControl != null)
        _gridControl .SelectionMode = DataGridSelectionMode.Extended;
}

partial void SomeAction_Execute()
{     foreach (ObjectName e in _gridControl.SelectedItems)     {         ...    
    } 
}

Lightswitch: Get choice value of a property

I have found quite a number of things from the internet when I was doing my Lightswitch development, but I cannot remember most of the source now. So thanks for people in the community who have contributed but sorry I cannot acknowledge them properly.

 

Here is an extension method for getting the choice value of a property in code:

public static string GetDisplayedChoiceValue(this IEntityStorageProperty property)
{
    // If the value is null, it has no display value
    if (null == property.Value)
        return null;

    string valueAsString = property.Value.ToString();
    // Get the list of choices for this property
    IEnumerable<ISupportedValueAttribute> choices = property.
                   GetModel().Attributes.OfType<ISupportedValueAttribute>();
    // Find the choice that matches the property value
    ISupportedValueAttribute choice = choices.Single(
                   c => String.Equals(c.Value, valueAsString, StringComparison.Ordinal));

    // If the choice does not have a display name, return the choice value instead
    if (String.IsNullOrEmpty(choice.DisplayName))
        return choice.Value;
    else
        return choice.DisplayName;
}

To use it with your object:

CodeName = o.Details.Properties.Code.GetDisplayedChoiceValue(),