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Hi, maybe everybody can help me with Dependency Properties and a custom Control, this costumer Control contains a grid, the grid shall be created progammatically- new columns with Buttons and external controls.
I have a dependency properties in this custom Control, but when i call the custom Control then the grid doesn't change.
It seems I have no accessto the grid? Because nothing will created in the grid, no column, no button. What do I wrong?
What I have tried:
my dependency property :
public static DependencyProperty Symbol1Name =
DependencyProperty.Register("Sym1Name", typeof(string), typeof(UserControl1), new FrameworkPropertyMetadata("test", OnSymbol1PropertyChanged))
public string Sym1Name
{
get { return (string)this.GetValue(UserControl1.Symbol1Name); }
set { this.SetValue(UserControl1.Symbol1Name, value); }
}
The onChange Function
private static void OnSymbol1PropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
{
UserControl1 ak = dependencyObject as UserControl1;
ak.OnPropertyChanged("Symbol1Name");
ak.OnSymbol1PropertyChanged(e);
}
The function to Change works in normal WPF App:
private void OnSymbol1PropertyChanged(DependencyPropertyChangedEventArgs e)
{
try
{
change(Sym1Name, 0);
}
catch (System.Exception ex)
{
MessageBox.Show(ex.Message);
}
}
The XAML:
<Grid x:Name="Grid1" Grid.Column="1" Background="Gray" Margin="5,0,0,0" >
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
</Grid>
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It is possible to show group summary rows in a standard WPF Data Grid? I've been Googling and I can't see to find what I'm looking for.
Do I need a third party grid for this? If so, any suggestions?
Thanks
If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.
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Kevin Marois wrote: It is possible to show group summary rows
I presume you mean Sub Total rows - not sure if the standard DG will do it but the Telerik one certainly does. 
Actually I will bet every commercial DG will have that feature.
Google foo wpf datagrid grouping subtotal - Google Search[^]
Never underestimate the power of human stupidity
RAH
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Thanks. I was hoping to not have to buy one.
BTW, why did you post a Google search? Not sure what that's for when I already said I Googled it.
If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.
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Kevin Marois wrote: I already said I Googled it
Missed that and it looked like there was some reasonable hacks to the standard DG. I have used Gerry's suggestion in the past, inserting total rows manually, it may not be grouping but you do get the sub totals.
Never underestimate the power of human stupidity
RAH
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Calculate group total objects and add them to the data grid's data source (at the end of each group). Add a type code and style accordingly; or use a template selector.
"(I) am amazed to see myself here rather than there ... now rather than then".
― Blaise Pascal
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The subject really say it all, even if it sounds over-complicated. Please hang on.
I have a DataGrid. There are several columns in the DataGrid.
One of the columns contains a ListView. The listView holds several rows.
Each row contains a TextBlock and a Button.
The TextBlock's Text property contains a name, which I want to pass to my ViewModel.
I have managed to create a small example of this which should be just to "copy-paste-run".
Since it is "a lot" of code I have made a public gist to store it in.
Link to source in GIT Gist[^]
Setup:
* I use Visual Studio 2015 and compiling to NET 4.5.2.
* I also use Fody.PropertyChanged, then I'm not needed to manually type all stuff required for the INotifyPropertyChanged interface.
* Create a new WPF application and call it: WpfTest.
* Save the project.
* Install the Fody.Propertychanged in the NuGet Package Manager.
* Create the FodyWeavers.xml file.
* Paste all code from the Gist.
Note:
If the compiler says: "Fody: Could not find a weaver named 'PropertyChanged'. ..."
Remove the <PropertyChanged /> from the FodyWeaver.xml file and try again. That line is not neccessary for this and I don't understand why it sometimes fail when compiling.
This is what I want
If you click any of the buttons in the DataGrid I want the associated name on the same row in the ListView to be bound to the SelectedName property in the ViewModel.
I have no clue how to do the binding of the selected Textblock's Text property to the ViewModel in the View's xaml code.
For example: Press the button to the right of NameA. I then want my ViewModels SelectedName to be "NameA".
I tried this in the ListView, but no luck:
<ListView ItemsSource="{Binding Names}" SelectedItem="{Binding SelectedName}">
I also tried this, with no luck:
<ListView ItemsSource="{Binding Names}" SelectedItem="{Binding Path=DataContext.SelectedName, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}">
Please, how can I do this?
P.S
I can kinda get this to work by binding the SelectedItem property from the DataGrid and the SelectedIndex property from the ListView. But that feels like a work-around.
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No sympathy.
- Add a click handler / delegate that "stuffs" the "selection"; i.e. "code behind". (It's PLUMBING).
- And you don't need all that "property changed stuff". If you know you are refreshing all controls on a container, you can call propertychanged with "no name" (on the container) and refresh all with one statement. You need a really "slow" machine for individual "property changed" events to make a difference.
"(I) am amazed to see myself here rather than there ... now rather than then".
― Blaise Pascal
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Hi everybody,
I would like to set a background image to a Groupbox and have it displayed at run time.
Below are the lines inserted in the xaml file at the appropriate locations:
<Window.Resources>
<VisualBrush x:Key="myNewBrush">
<VisualBrush.Visual>
<Grid>
<Rectangle Fill="Transparent"/>
<Image Source = "/Resources/Images/BartMap.png"/>
</Grid>
</VisualBrush.Visual>
</VisualBrush>
</Windows.Resources>
<GroupBox Grid.Row="1" Grid.Column="0" Background="Transparent">
<GroupBox.Header>
<Label FontWeight="Bold">Track plan </Label>
</GroupBox.Header>
<Grid Background="{StaticResource myNewBrush}">
</Grid>
</GroupBox>
My problem: The image background is not displayed at runtime.
Could anyone help me with this issue?
Best regards,
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I copied your code into a project and ran it successfully. The only thing that's different in my version is that I have a different image (obviously). Check that the image is set to a Build Action of Resource and that Copy To Output Directory is set to Do Not Copy. My successful code:
<Window x:Class="WpfSample.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfSample"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<VisualBrush x:Key="myNewBrush">
<VisualBrush.Visual>
<Grid>
<Rectangle Fill="Transparent"/>
<Image Source = "real-sense-images.png" />
</Grid>
</VisualBrush.Visual>
</VisualBrush>
</Window.Resources>
<Grid>
<GroupBox Background="Transparent">
<GroupBox.Header>
<Label FontWeight="Bold">Track plan</Label>
</GroupBox.Header>
<Grid Background="{StaticResource myNewBrush}"/>
</GroupBox>
</Grid>
</Window>
This space for rent
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Hi Pete,
Thank you for your reply.
I'm wondering if you could precise a little bit what you mean by: "<i>Check that the image is set to a Build Action of Resource and that Copy To Output Directory is set to Do Not Copy</i>".
Best regards,
Hervend
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I've checked and the two settings have the default values you specified.
Up to now I don't understand what's going on. 
Hervend
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Thank you all for your replies.
I have set the property Copy To Output Directory to Always Copy.
And everything seems now to be in order.
thank you for your support.
Hervend
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Would you not be better off creating a style element:
<GroupBox Grid.Row="4" Header="Test" BorderBrush="Black" BorderThickness="1">
<GroupBox.Style>
<Style TargetType="GroupBox">
<Setter Property="Background" Value="{StaticResource myNewBrush}"/>
</Style>
</GroupBox.Style>
<Button Grid.Row="0" Name="_buttonPressMe" Content="Press me!" Click="_buttonPressMe_Click" Width="80"/>
</GroupBox>
Obviously the layout in the above is rubbish, but the background is set correctly. I tested this in a demo app and it ran fine.
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Or like this:
<GroupBox Grid.Row="4" Header="Test" BorderBrush="Black" BorderThickness="1" Background="{StaticResource myNewBrush}">
<Button Grid.Row="0" Name="_buttonPressMe" Content="Press me!" Click="_buttonPressMe_Click" Width="80"/>
</GroupBox>
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Thank you for your reply Leif,
But it doesn't seem to work neither. unfortunately ...
Hervend
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Then as Pete suggests, it must be your image and its settings, or the way you specified your image in the xaml.
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For those familiar with them, TVPs are a great way to reduce the number of calls to the database and improve performance. I use them to great effect in the MVC web app using the general technique below. In the stored procedure I use a cursor to iterate through the rows and do all the db stuff in one whack.
I copied the same routines to a WPF app I'm doing, however, and it flames out calling the proc. I've since deleted it and gone the multiple calls route so I don't remember the precise error message but in general it was barking about not liking the parameters.
I'm on the same box, same version of VS, etc. and literally copied and pasted my routines. Works in MVC, no joy in WPF.
Have any of you successfully used table value parameters in a WPF app, and if so, is there a trick I'm missing?
DataTable tvp = new DataTable();
tvp.Columns.Add(new DataColumn("Id", Type.GetType("System.Int32")));
tvp.Columns.Add(new DataColumn("RowIdx", Type.GetType("System.Int32")));
tvp.Columns.Add(new DataColumn("ParentId", Type.GetType("System.Int32")));
tvp.Columns.Add(new DataColumn("MemberId", Type.GetType("System.Int32")));
DataRow row = null;
int iRowIdx = 0;
foreach (int iId in Ids)
{
row = tvp.NewRow();
row["Id"] = 0;
row["RowIdx"] = iRowIdx++;
row["ParentId"] = iListId;
row["MemberId"] = iId;
tvp.Rows.Add(row);
}
...
Command.Parameters.AddWithValue("@Entries", tvp);
...
ExecuteNonQuery(), etc.
Thanks!
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ADO.NET is ADO.NET; there's no difference whether you're calling it from ASP.NET, WPF, or a console application.
If it works in your ASP.NET application, but not in your WPF application, then there's a difference in the code which you haven't shown. For example, verify that Command is a SqlCommand instance, and not some other type.
NB: You can replace your Type.GetType calls with the typeof keyword[^]:
tvp.Columns.Add(new DataColumn("Id", typeof(int)));
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Hey, Richard.
Appreciate the feedback. Yeah, that was my take on it as well - ADO.NET should be ADO.NET. However, after a few decades of dealing with MS technologies, I never take that as gospel.
When I get some time I'm going to try it again as the performance difference is significant, but I eyeballed the code pretty intensely and am as sure as I ever am about such things that it was the same in both environments. I hope to be wrong about that because otherwise I'm out of ideas.
Do you use TVPs in your ADO.NET apps?
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Christopher Duncan wrote: Do you use TVPs in your ADO.NET apps?
Yes, although I tend to use the IEnumerable<SqlDataRecord> approach, rather than a DataTable.
private static IEnumerable<SqlDataRecord> AsTableValuedParameter(IEnumerable<string> value)
{
var record = new SqlDataRecord(new SqlMetaData("Value", SqlDbType.NVarChar, 0x100));
foreach (string item in value)
{
record.SetValue(0, item);
yield return record;
}
}
...
IEnumerable<string> roleNames = ...;
var parameter = command.Parameters.AddWithValue("@RoleNames", AsTableValuedParameter(roleNames));
parameter.SqlDbType = SqlDbType.Structured;
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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That's a nice approach. The DataTable was from an example I found on TVPs. I was focused on making the db interaction worked and never thought to convert it to something more elegant. Deadlines and all that.
I'm going to take another swing at this today. Hopefully I just fat fingered something when I cloned the MVC code I was using. Appreciate all the help.
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Well, apparently the fingers are indeed fat. Tried again this morning and it worked without a fuss.
Still using DataTable approach at this point. MS says SqlDataRecord is resource abusive and recommends not creating a new one but reusing a single instance. That aside, are there any benefits to the enumerable approach over populating a data table?
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Christopher Duncan wrote: MS says SqlDataRecord is resource abusive and recommends not creating a new one but reusing a single instance.
Which is why I was doing that in the sample I posted. 
Christopher Duncan wrote: are there any benefits to the enumerable approach over populating a data table?
Not that I'm aware of.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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