Re: WPF performance on Windows XP - WPF Discussion Boards

Vasudevan Deepak Kumar2-Apr-13 10:46

2-Apr-13 10:46

Are there known issues with WPF GDI with Windows XP? I have a bunch of observations of a legacy WPF application that we have only on XP but works fine with Weven and others.

Vasudevan Deepak Kumar
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Re: WPF performance on Windows XP

SledgeHammer012-Apr-13 11:39

SledgeHammer01

2-Apr-13 11:39

WPF is flakey on XP. Known issue.

Re: WPF performance on Windows XP

Gerry Schmitz2-Apr-13 12:05

Gerry Schmitz

2-Apr-13 12:05

WPF is fine on XP ... when there are issues, it's because of crappy graphics cards (in my experience).

WPF uses DirectX; the graphics card needs to support some minimum level of DirectX.

Re: WPF performance on Windows XP

SledgeHammer012-Apr-13 12:12

SledgeHammer01

2-Apr-13 12:12

Not true. XP uses a completely different rendering mechanism then Windows 7. By default WPF on XP is software only. On Vista / Win7 its hardware accelerated.

Re: WPF performance on Windows XP

Gerry Schmitz2-Apr-13 12:38

Gerry Schmitz

2-Apr-13 12:38

"By default WPF on XP is software only".

You are mistaken; WPF on XP is "software only" as a last resort ... i.e. when the hardware is inadequate.

I suggest you read the following on "Graphics Rendering Tiers" (in WPF):

http://msdn.microsoft.com/en-us/library/ms742196(v=vs.100).aspx[^]

Re: WPF performance on Windows XP

SledgeHammer012-Apr-13 13:02

SledgeHammer01

2-Apr-13 13:02

Cool link. What's your point? Have you ever tried retrieving the rendering tier on XP?

Re: WPF performance on Windows XP

Gerry Schmitz2-Apr-13 13:45

Gerry Schmitz

2-Apr-13 13:45

Since you still don't "get it", we're done.

Re: WPF performance on Windows XP

Pete O'Hanlon2-Apr-13 12:09

Pete O'Hanlon

2-Apr-13 12:09

It's not GDI in WPF. Do these XP machines have NVidia cards in them by any chance? The NVidia drivers were flaky as dammit on XP. Also, the WPF stack took some major improvements in WPF 4 on W7.

One thing to do - find out if the WPF app is performing software or hardware rendering on your XP box. Have a look at this[^].

I was brought up to respect my elders. I don't respect many people nowadays.

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ComboBox in a DataGrid, Binding Problem

shakilahmad1232-Apr-13 1:23

shakilahmad123

2-Apr-13 1:23

<pre lang="css">We have a Datagrid, as Show in the Above Image.
The 1st Row in the Datagrid in a Parent Record, on ComboBox selectionChanged event. the Two records are being populated as ChildRecords.
The FirstColumn in the DataGrid is a Combobox and its selectedValue comes from a Field, ItemId.
The problem is happening when The Grid is binding with the Child Records, the Combobox selection is always happening to be the Last ItemId for all Combobox's in this Column.

The result required:
The Each ComboBox in each Row should have the SelectedValue as of its own Record Set.</pre>

Hello All.

caradri1-Apr-13 23:08

caradri

1-Apr-13 23:08

I need help to find (or make) a control for windows environment (xaml/wpf) that scroll up automatically lines of text in a specific speed. vertical scroll.
like a News Scroller of news sites...
thanks.

Re: Hello All.

Kenneth Haugland2-Apr-13 9:21

Kenneth Haugland

2-Apr-13 9:21

Pehaps this would work:
http://stackoverflow.com/questions/7153302/scroll-animation[^]

Data display issue with combo box in wpf data grid

ukraju1-Apr-13 7:31

ukraju

1-Apr-13 7:31

Hi,I am having one problem related to ComboBox of DataGrid. Data is binding but it is not showing in the ComboBox after binding. My xaml code is like below.

<my:DataGridTemplateColumn Header="UsgSrc">
    <my:DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <ComboBox Name="cbUsgSrc"  
                      ItemsSource="{Binding Source={StaticResource UsgSrcUOMS}}" 
                      SelectedValue="{Binding Path=UsgSrc}" 
                      SelectedValuePath="UtType" 
                      DisplayMemberPath="UtType">
            </ComboBox>
        </DataTemplate>
    </my:DataGridTemplateColumn.CellTemplate>
</my:DataGridTemplateColumn>

I am assigning the data to combo box in the code behind like below.

<pre lang="c#">

ObjectDataProvider UsageSrcUOMS = null;
UsageSrcUOMS = (ObjectDataProvider)FindResource("UsgSrcUOMS");
UsageSrcUOMS.ObjectInstance = objUtView;
Microsoft.Windows.Controls.DataGridCell cell = obj.GetCell(dgMtrHdr, J, 11);
if (cell != null)
{
ContentPresenter panel = cell.Content as ContentPresenter;
if (panel != null)
{
ComboBox cmbUsUtilit = obj.GetVisualChild<combobox>(panel);
cmbUsUtilit.IsEnabled = true;
if(objUtView!=null)
cmbUsUtilit.ItemsSource = objUtView;

cmbUsUtilit.SelectedIndex=2;
}
}

Please help me why the data is not displaying in the combo box after binding.

Re: Data display issue with combo box in wpf data grid

Richard MacCutchan1-Apr-13 21:48

Richard MacCutchan

1-Apr-13 21:48

Your XAML declares a StaticResource for the binding, which does not exist at load time; see the discussion here[^].

Use the best guess

Get File Path from ListView

MumbleB31-Mar-13 3:44

MumbleB

31-Mar-13 3:44

Hi Guys, I have a nice working app in Windows Forms. I am attempting to port it to WPF and I am stuck with selecting a row and getting a value from one of the columns.

Apologies for the long code:

In Windows Forms App I do the below:

private void lstFiles_DoubleClick(object sender, EventArgs e)
{
    if (lstFiles.SelectedItems.Count != 0)
    {
        string file = lstFiles.SelectedItems[0].Text;
        openFormGeneral(file);
    }
}

In WPF .xaml:

<ListView x:Name="lstFile" Height="357" HorizontalAlignment="Left" Margin="18,144,0,0" VerticalAlignment="Top" Width="550"
          ItemsSource="{Binding songDetails}"
          MouseDoubleClick="lstFile_MouseDoubleClick"
          IsSynchronizedWithCurrentItem="True"
          SelectedItem="{Binding Path=SelectedSong}">
    <ListView.View>
        <GridView>
            <GridViewColumn CellTemplate="{StaticResource FirstCell}" Width="30" />
            <GridViewColumn Header="File Name" DisplayMemberBinding="{Binding FileName}" />
            <GridViewColumn Header="Title" DisplayMemberBinding="{Binding Title}" />
            <GridViewColumn Header="Artist" DisplayMemberBinding="{Binding Artist}" />
            <GridViewColumn Header="Album" DisplayMemberBinding="{Binding Album}" />
            <GridViewColumn Header="Set" DisplayMemberBinding="{Binding Set}" />
            <GridViewColumn Header="Genre" DisplayMemberBinding="{Binding Genre}" />
            <GridViewColumn Header="Language" DisplayMemberBinding="{Binding Language}" />
            <GridViewColumn Header="File Path" DisplayMemberBinding="{Binding FilePath}" />
        </GridView>
    </ListView.View>
</ListView>

I Populate the ListView as follows:

public class songDetails
{
public string Title { get; set; }
public string Artist { get; set; }
public string Track { get; set; }
public string Set { get; set; }
public string Album { get; set; }
public string Genre { get; set; }
public string Language { get; set; }
public string FileName { get; set; }
public string FilePath { get; set; }
}

public IList<songDetails> songDetail { get; set; }


public void AddFile(ID3Info File)
{
    lstFile.Items.Add(new
    {
        FileName = File.FileName,
        Artist = File.ID3v2Info.GetTextFrame("TPE1"),
        Title = File.ID3v2Info.GetTextFrame("TIT2"),
        Track = File.ID3v2Info.GetTextFrame("TRCK"),
        Album = File.ID3v2Info.GetTextFrame("TALB"),
        Genre = File.ID3v2Info.GetTextFrame("TCON"),
        Language = File.ID3v2Info.GetTextFrame("TLAN"),
        FilePath = File.FilePath
    });

    artist = File.ID3v2Info.GetTextFrame("TPE1");
    track = File.ID3v2Info.GetTextFrame("TRCK");
    set = File.ID3v2Info.GetTextFrame("TPOS");
    title = File.ID3v2Info.GetTextFrame("TIT2");
    album = File.ID3v2Info.GetTextFrame("TALB");
    genre = File.ID3v2Info.GetTextFrame("TCON");
    language = File.ID3v2Info.GetTextFrame("TLAN");

    InitializeComponent();
    this.DataContext = this;
}

How do I access the FilePath from the ListView with MouseDoubleClick event? Thanks in advance

Excellence is doing ordinary things extraordinarily well.

Re: Get File Path from ListView

Mycroft Holmes31-Mar-13 12:39

Mycroft Holmes

31-Mar-13 12:39

You bound the SelectedSong so SelecedSong.FilePath should contain your information provided you double clicked on a row so test for null!

Never underestimate the power of human stupidity
RAH

Re: Get File Path from ListView

MumbleB1-Apr-13 0:34

MumbleB

1-Apr-13 0:34

Hi Mycroft. Thanks for the reply. This may sound stupid but how do I do that? I have tried numerous things and nothing works or I get a very long string of all the items in the object returned. Frown | :(

Excellence is doing ordinary things extraordinarily well.

Re: Get File Path from ListView

Mycroft Holmes1-Apr-13 1:23

Mycroft Holmes

1-Apr-13 1:23

Wherever this property (SelectedSong) is declared is where you object is

SelectedItem="{Binding Path=SelectedSong}"

In your doubleclick event you need to reference the SelectedSong

string sPath = class.SelectedSong.FileName

If you are using MVVM then class = your viewmodel.

Never underestimate the power of human stupidity
RAH

Re: Get File Path from ListView

MumbleB2-Apr-13 9:10

MumbleB

2-Apr-13 9:10

Hi Mycroft. Apologies for taking this long to reply. Been a little busy. I tried the below and I get the SelectedItem but it does not get passed to "theSong". Am I going crazy or am I just missing the point completely here?

private void lstFile_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    try
    {
        var theSong = this.lstFile.SelectedItem as songDetails;

        if (theSong != null)
        {
            string filePath = theSong.FilePath;
        }
    }
    catch (Exception ex)
    {
        System.Windows.Forms.MessageBox.Show(ex.Message.ToString());
    }

}

Excellence is doing ordinary things extraordinarily well.

Re: Get File Path from ListView

Mycroft Holmes2-Apr-13 12:15

Mycroft Holmes

2-Apr-13 12:15

You are missing the point completely Smile | :)

you are thinking like winforms, stop.

You should not/never be referencing the controls in the view but the collection it is bound to in you viewmodel or code behind. Stop trying to get the info from the list control and look in the SelectedSong property where you have bound the SelectedItem to!

Never underestimate the power of human stupidity
RAH

Re: Get File Path from ListView

MumbleB3-Apr-13 7:27

MumbleB

3-Apr-13 7:27

I bound the SelectedSong to a textBox and it works now. Not the cleanest way of doing things but it works.

Thanks

Excellence is doing ordinary things extraordinarily well.

modified 3-Apr-13 17:25pm.

Collection of User Controls

Mycroft Holmes30-Mar-13 22:44

Mycroft Holmes

30-Mar-13 22:44

I have a requirement to display a collection of sections, each section needs needs to show a few combos, a couple of large textboxes, probably a grid and support drag and drop files.

I was thinking of using a listbox of user controls, the user control would be an expander (telerik) with all the bits in it.

My issues is how to put together the collection/control/viewmodel. Building the VM that accepts a SelectedSection and loads the static lists for the combos etc is not a problem. I can then bind the view datacontext to the viewmodel.

I would then use the UC as the datatemplate of the listbox. How do I bind the SectionsList collection to the listbox and the UC data template.

Are there any good examples of this!

Never underestimate the power of human stupidity
RAH

Re: Collection of User Controls

SledgeHammer0131-Mar-13 14:48

SledgeHammer01

31-Mar-13 14:48

You should not expose a collection of user controls, or any control for that matter. Define a class called Section (whatever the hell that is) that contains all the data for a section. Then define an ObservableCollection<Section> and expose that from your VM and bind it to the ListBox ItemsSource. Then simply define the ItemTemplate for the ListBox and you are good to go.

Your ItemTemplate would define the controls and their layout and bind them to the Section object which will be the ListBoxItem content.

Re: Collection of User Controls

Mycroft Holmes31-Mar-13 14:55

Mycroft Holmes

31-Mar-13 14:55

This is fine for a standard list of items, I need a UC and a VM for each item in the list.

Never underestimate the power of human stupidity
RAH

Re: Collection of User Controls

SledgeHammer0131-Mar-13 15:13

SledgeHammer01

31-Mar-13 15:13

Not quite sure what you mean. When you say "UC", you should be using a DataTemplate that defines that "UC". When you say "VM" for each item, that would be your Section object. In fact, if you want to argue semantics, your DataTemplate could just be your user control. It would inherit the DataContext.

Re: Collection of User Controls

Mycroft Holmes31-Mar-13 15:30

Mycroft Holmes

31-Mar-13 15:30

My section object is a Model, basically a POCO with onpropertychanged events.

Main View has an observable collection of Sections, these are to be displayed in a list/tree container that needs to contain a set of controls (UC) for the management of the section contents.

UC UserControl will be a set of controls required for each section (datatemplate), including combos and a drag and drop target, an expander and some large textboxes.

The UC will need bind to a ViewModel to manage the Section interactions. How to achieve the binding is my problem!

Never underestimate the power of human stupidity
RAH

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