I am developing a silverlight application where you can set sales target for specific kind of product.
I have a combobox which has some product types in it like Rice , Tea etc. Once you select a type, all products of that type gets loaded into a datagrid with following info:
Product Name, Session(this is the time for which the target is going to be activated,selected using a datepicker before,and added to datagrid as string), Target Amount.
I have defined the datagrid like below:
<sdk:DataGrid x:Name="productListGrid" Margin="8,117,8,8" ColumnHeaderStyle="{StaticResource DataGridColumnHeaderStyle}" CellStyle="{StaticResource DataGridCellStyle}" RowHeight="50" AutoGenerateColumns="False">
<sdk:DataGrid.Columns>
<sdk:DataGridTextColumn Binding="{Binding ProductName}" CanUserSort="True" CanUserReorder="True" CellStyle="{x:Null}" CanUserResize="True" ClipboardContentBinding="{x:Null}" DisplayIndex="-1" DragIndicatorStyle="{x:Null}" EditingElementStyle="{x:Null}" ElementStyle="{x:Null}" Foreground="{x:Null}" FontWeight="Normal" FontStyle="Normal" FontSize="NaN" HeaderStyle="{x:Null}" Header="Name" IsReadOnly="False" MaxWidth="Infinity" MinWidth="0" SortMemberPath="{x:Null}" Visibility="Visible" Width="Auto"/>
<sdk:DataGridTextColumn Binding="{Binding Session}" CanUserSort="True" CanUserReorder="True" CellStyle="{x:Null}" CanUserResize="True" ClipboardContentBinding="{x:Null}" DisplayIndex="-1" DragIndicatorStyle="{x:Null}" EditingElementStyle="{x:Null}" ElementStyle="{x:Null}" Foreground="{x:Null}" FontWeight="Normal" FontStyle="Normal" FontSize="NaN" HeaderStyle="{x:Null}" Header="Session" IsReadOnly="False" MaxWidth="Infinity" MinWidth="0" SortMemberPath="{x:Null}" Visibility="Visible" Width="Auto"/>
<sdk:DataGridTextColumn Binding="{Binding TargetQuantity, Mode=TwoWay}" CanUserSort="True" CanUserReorder="True" CellStyle="{x:Null}" CanUserResize="True" ClipboardContentBinding="{x:Null}" DisplayIndex="-1" DragIndicatorStyle="{x:Null}" EditingElementStyle="{x:Null}" ElementStyle="{x:Null}" Foreground="{x:Null}" FontWeight="Normal" FontStyle="Normal" FontSize="NaN" HeaderStyle="{x:Null}" Header="Target Quantity" IsReadOnly="False" MaxWidth="Infinity" MinWidth="0" SortMemberPath="{x:Null}" Visibility="Visible" Width="Auto"/>
</sdk:DataGrid.Columns>
</sdk:DataGrid>
I have a class that represents each row:
public class DataGridRow
{
public string ProductName{get;set;}
public string Session { get; set; }
public string TargetQuantity { get; set; }
}
And then using the following method I set itemssource of the datagrid:
private void initDataGrid(string product_type)
{
List<DataGridRow> rows = new List<DataGridRow>();
if (start.Equals(NullDate) || end .Equals(NullDate))
{
MessageBox.Show("Please select start and end date first!");
}
else
{
var products_list = _context.Products.Where(entity => entity.ProductType.Equals(product_type));
var product_name_list = from product in products_list select product.ProductName;
foreach (string name in product_name_list)
{
rows.Add(new DataGridRow()
{
ProductName = name,
Session = this.Months[start.Month-1] + "," + start.Year + "->" + this.Months[end.Month-1] + "," + end.Year,
TargetQuantity = "0.0"
});
}
try
{
this.productListGrid.ItemsSource = rows;
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
I have checked the list rows by a for loop if it was filled properly, and saw that it was.
This method is invoked once I select a product type from combo box:
private void productCombo_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
{
string product_type=(string)e.AddedItems[0];
this.initDataGrid(product_type);
}
But once I run the app and select something from the combobox the whole screen becomes blank.Then I commented out the line this.productListGrid.ItemsSource = rows; from initDataGrid method and then I could select items from combo except the datagrid left blank this time(usual actually, the itemssource is not set)
So it seems when I set the ItemsSource for DataGrid my silverlight app gets crashed. I have been struggling with it for few hours,searched Google & StackOF so many times,but no way… so I need help badly.
If any body can solve the problem please give a bit explanation too as I am new to silverlight and don’t want to make the mistake again due to lack of knowledge.
Thanks in advance.
Since you’re not giving an exception we don’t have much to go on. I would guess since you’re posting it here that there isn’t a specific line it’s breaking on then it’s probably a Xaml issue. For starters, try simplifying your datagrid’s columns. You’re setting a bunch of properties you have no business setting. I’m also noticing you’re setting DisplayIndex to -1 on each of them which I suspect is the issue.
Try this: