I have a WCF workflow service application. The service is defined as follows:

and the binding configuration is:

Now if I run this in IIS Express everything works fine... In IIS however ServiceSecurityContext.Current is null. Does anybody have any idea?

Like this:

<Window x:Class="SDKSample.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Window.Resources>

<XmlDataProvider x:Key="MyData" XPath="/Info">
	<x:XData>
		<Info xmlns="">
			<AccessEvents Name="A" Text="Hello"/>
			<AccessEvents Name="B" Text="Hi" />
			<AccessEvents Name="C" Text="Bye" />
		</Info>
	</x:XData>
</XmlDataProvider>

<DataTemplate x:Key="SecondCell">
	<CheckBox IsChecked="{Binding Path=IsSelected, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListViewItem}}}" Content ="{Binding XPath=@Text}"/>
</DataTemplate>

</Window.Resources>

<ListView ItemsSource="{Binding Source={StaticResource MyData}, XPath=AccessEvents}" >
	<ListView.View>
		<GridView>
			<GridViewColumn Header="Access Event" DisplayMemberBinding="{Binding XPath=@Name}" Width="150"/>
			<GridViewColumn Header="Deliver" CellTemplate="{StaticResource SecondCell}" Width="80"/>
		</GridView>
	</ListView.View>
</ListView>
</Window>

First you need to think if you really need to do this. It seems a bit odd what you want. One way to do it, is using a template selector (DataTemplateSelector to be more precise). With this thing you can create several templates and, based on some properties of the object you are binding to (in this case "Name"), select one of them. Of course this only works if you only have a few templates... Here's a nice example: http://www.beacosta.com/blog/?p=16[^] Mihai,

It's nothing wrong with what you did. I'd still use the Tag property because it can handle any object and not just strings and because you never know when you might need the tooltip property for a real tooltip.

The simplest solution is to start the dragdrop with this line "DragDrop.DoDragDrop(tvi, dragContext.Description, DragDropEffects.Copy);" I assume that Description is a string. You can than just forget about the other two events. The textbox already knows how to handle the dragover and dragdrop events with strings. This is what is causing the behaviour. The textbox already has a command binding for the paste command which handles the two events and marks them as handled. If you want to drag drop other things than string, you'll have to handle the events before textbox does, and to mark them as hadled so it can't override your settings:

TextBox AllowDrop="True" Drop="TextBlock_Drop" PreviewDragOver="TextBlox_DragOver" PreviewDragEnter="TextBlox_DragOver"

private void TextBlox_DragOver(object sender, DragEventArgs e) { if (e.Data.GetDataPresent(typeof(Button))) { e.Effects = DragDropEffects.Copy; } else { e.Effects = DragDropEffects.None; } e.Handled = true; }

What you are doing is quite strange ... it's not a good idea to keep important data in the tooltip property.

private UIElement getElement(int column, int row)
        {
            foreach (UIElement e in MyGrid.Children)
                if (Grid.GetColumn(e) == column)
                    if (Grid.GetRow(e) == row)
                        return e;

            return null;
        }

You will have to cast the UIElement to textblock to get the tooltip.

<ScrollViewer VerticalScrollBarVisibility="Auto">
    <TextBlock Text="" Width="Auto" Height="Auto" TextAlignment="Left" TextWrapping="Wrap"/>
</ScrollViewer>

Not exactly what you want, but you can achieve the same effect by placing the textblock in a scrollviewer and letting it strecth as much as it needs to. Mihai,

For objects that are placed inside a grid a combination of HorizontalAlignment, VerticalAlignment and Margin can be used to control the position in a similar way to "Anhor". Anchor right & bottom <=> HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin=",,," Anchor left & right <=> HorizontalAlignment="Stretch". As I said the controls must be placed inside a grid; Mihai,

what happens if you try this: DataType="{x:Type local:NonDataNode}" instead of DataType="local:NonDataNode" ? Mihai,

That's it; Thanks.

This sounds like the expander contol.

I've got this datatemplate for a listbox or combobox. How can I make the red grid be as large as the item; at the moment it shrinks down to the size of the textblock.<DataTemplate x:key="DataTemplate2"> <Grid Background="#FFFF0000" > <TextBlock Text="{Binding}" /> </Grid> </DataTemplate>

You could try binding the background brush to the textbox and use a custom converter that receives as a parameter the string from the cell. Mihai,

I'm quite sure that is impossible. Anyway, a singleton control sounds like a very bad idea. First of all why would you need such a thing? Seccondly, how would you expect it to work when you add a seccond "instance" of the control? I'm asking this because a control can only have one parent, so it can't be in to places at once. On the other side, if you want to make sure that the control is only used once, you could keep track of the number of instances created in a static variable, and throw an error when another instance has already been created. Mihai,

Is anybody aware of a bug (and a fix) in VS 2005 SP1 that generates errors in datasets when adding an insert/update/delete query. The error is "reference is not set to an instance of an object" (usually line 1) and is generated because the "Name" attribute is not saved in the xml file. Sometimes, simply loading the dataset in Visual Studio, and saving it clears all the "Name" attributes in the xml; and this has happened on multiple computers. Mihai,

It's not binding but here it goes: You should replace these lines with the proper values entry.Path = "GC://****"; entry.Username = txtUN.Text; entry.Password = txtPW.Text; DirectoryEntry entry = new DirectoryEntry(); entry.Path = "GC://****"; entry.Username = txtUN.Text; entry.Password = txtPW.Text; DirectorySearcher ds = new DirectorySearcher(entry); ds.Filter = txtQuery.Text; ds.CacheResults = false; ds.SearchScope = SearchScope.Subtree; foreach (string s in cols) ds.PropertiesToLoad.Add(s); src = ds.FindAll(); cbResults.Items.Clear(); for (int i = 0; i < src.Count; i++) { if (src[i].GetDirectoryEntry().Properties["mail"].Value != null) cbResults.Items.Add(src[i].GetDirectoryEntry().Properties["mail"].Value); else cbResults.Items.Add(i); } private string[] cols = { "displayName", "givenName", "sn", "ou", "employeeType", "mail", "telephoneNumber", "samAccountNumber", "whenCreated", "whenChanged", "objectGUID", "c", "objectCategory", "anr", "otherTelephone", "cn", "badPwdCount", "lockoutTime", "pwdLastSet", "lastLogon", "mobile", "Profile", "LastLogin", "MaxStorage", "PasswordAge", "Description", };

You didn't mention adding the project dependencies (right click main project/Add reference/ Choose VC project). You should now be able to step into unmanaged code. However, there are lots of strange behaviours (like functions which completly ignore return statements and so on) when debugging managed and unmanaged code in the same time.

Not exactly sure this is the right messaeg board for this question... How can I hide the blue selection background on a wpf listbox? -- modified at 3:48 Thursday 21st June, 2007

I need to implement drag and drop with some files between a database and the desktop. The problem is that when dragging from the server to the desktop I don't have an actual file to set the data object. I'm looking for something like "delayed rendering" or something else which would allow me to download the file after the user dropped it. Mihai,