WPF Discussion Boards

Re: Stuck with Weird Exceptions

7-Sep-21 13:51

I have a Purchase Order Creation window that has dialogs to allow the user to add items to the PO. The main view model is AddEditPurchaseOrderViewModel. There are different types of items such as Equipment, Lumber, Hardware, etc, that can be added and each has its own View and VM.

In each window the user must select the item they want (Equipment, Hardware, etc) and any number of Sequence Sheets. For each Sequence Sheet selected a new line item created an added to the Purchase Order. So, if the user selects Lumber for 3 Sequence Sheets, then 3 Lumber line items are added to the PO. To create the line items I am cloning the initial line item, changing a few properties on it, and adding it to the PO.

Here's a pic of what I'm working on.

All of a sudden now, my Clone class is throwing bizzare errors. It's telling me that the dialog's viewmodel is not serializable. It doesn't need to be - the entity I get from the VM's is what's being cloned.

Here's my AddPOItem Method

private void AddPOItemExecuted()
{
    _PurchaseOrderDialogBase vm = null;

    // Create a new default PO item
    var poItem = new PurchaseOrderItemEntity
    {
        PurchaseOrderHeaderId = PurchaseOrderHeader.Id,
        JobId = PurchaseOrderHeader.JobId,
        PurchaseOrderKind = PurchaseOrderHeader.PurchaseOrderKind
    };

    // Argument class
    var args = new AddEditPOItemArgsModel
    {
        LocationId = SelectedLocation.Id,
        POItem = poItem,
        SequenceSheets = _sequenceSheets,
        POType = PurchaseOrderHeader.PurchaseOrderType
    };

    switch (PurchaseOrderHeader.PurchaseOrderType)
    {
        // Add Equipment to the PO
        case Entities.Enums.PurchaseOrderType.Equipment:
            if (SelectedVendor.Id == AppCore.DNACompany.Id ||
                SelectedVendor.Id == AppCore.ParagonCompany.Id)
            {
                vm = new AddEditEquipmentFromInventoryViewModel(args, "Add Equipment Item");
            }
            else
            {
                vm = new AddEditPOItemViewModel(args, "Add Equipment Item", SelectedVendor.Id);
            }
            break;

        // Add Lumber to the PO
        case Entities.Enums.PurchaseOrderType.Lumber:
            if (SelectedVendor.Id == AppCore.DNACompany.Id ||
                SelectedVendor.Id == AppCore.ParagonCompany.Id)
            {
                vm = new AddEditLumberFromInventoryViewModel(args, "Add Lumber Item");
            }
            else
            {
                vm = new AddEditLumberPOItemViewModel(args, "Add Lumber Item");
            }
            break;

        // OTHER CASE STATEMENTS OMMITED
    }

    if (vm != null)
    {
        DialogResultEx dialogResult = DialogService.ShowDialog(vm, typeof(MainWindowView));

        if ((bool)dialogResult.DialogResult)
        {
            // For Equipment and Tools, only add one line item
            if (PurchaseOrderHeader.PurchaseOrderType == Entities.Enums.PurchaseOrderType.Equipment ||
                PurchaseOrderHeader.PurchaseOrderType == Entities.Enums.PurchaseOrderType.Tools)
            {
                poItem.EntityState = EntityState.New;
                PurchaseOrderHeader.PurchaseOrderItems.Add(poItem);
            }
            else
            {
                // For all other types, add one line item for each selected Lot
                var selectedSheets = vm.SequenceSheetInfos.Where(x => x.IsSelected).ToList();
                foreach (var selectedSheet in selectedSheets)
                {
                    // Clone the line item
                    var newItem = poItem.Clone();    //<============= THROWS HERE

                    // Adjust properties
                    newItem.JobSequenceSheetId = selectedSheet.JobSequenceSheetId;
                    newItem.EntityState = EntityState.New;
                    newItem.PlanElevation = selectedSheet.JobLotInfo;

                    // Add the Line Item to the PO
                    PurchaseOrderHeader.PurchaseOrderItems.Add(newItem);
                }
            }
        }
    }
}

and my Clone method

public static T Clone<T>(this T source)
{
    if (!typeof(T).IsSerializable)
    {
        throw new ArgumentException("The type must be serializable.", nameof(source));
    }

    if (ReferenceEquals(source, null))
    {
        return default;
    }

    using (Stream stream = new MemoryStream())
    {
        IFormatter formatter = new BinaryFormatter();
        formatter.Serialize(stream, source);
        stream.Seek(0, SeekOrigin.Begin);
        return (T)formatter.Deserialize(stream);
    }
}

And here's a pic of the error. Not that the type passed in is PurchaseOrderItemEntity, which IS serializable, yet the exception tells me the AddEditPOItemViewModel is not serializable. Th is doesn't make any sense. I get this regardless of which dialog I opened and the message shows that VM's name.

Anyone have any idea what's going on?

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

Richard Deeming7-Sep-21 21:28

Re: Stuck with Weird Exceptions

7-Sep-21 21:28

Based on the error, it looks like your PurchaseOrderItemEntity has gained a reference to your AddEditPOItemViewModel instance somehow. You'll need to dig into its properties to find out where that reference is, and mark the reference as "not serialized".

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Kevin Marois8-Sep-21 4:58

Disable ComboBox Hyperlinks

8-Sep-21 4:58

Thanks, but I already checked into that. No luck.

So this morning, on a hunch, I replaced my clone method with this

public static T Clone<T>(this T source) where T : class
{
    var clonedJson = JsonConvert.SerializeObject(source);
    return JsonConvert.DeserializeObject<T>(clonedJson);
}

and it now works. The previous clone code I posted was working up until something changed this week when it stopped working. Strange.

Thanks for your help.

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

Kevin Marois19-Aug-21 12:43

Re: Disable ComboBox Hyperlinks

19-Aug-21 12:43

Overview
I have a DataGrid with a DataGridTemplateColumn with a combobox inside it. The combobox is populated by enums using an ObjectDataProvider. The ComboBox DataTemplate renders the enum items hyperlinks.

Problem
I want to disable hyperlinks that should not be clickable based on some value on the entity. I'm not sure how to go about this.

Here is a screenshot of the grid

and here's the XAML

<DataGridTemplateColumn Header="Actions" 
                        Width="220">

<pre>
<DataGridTemplateColumn.CellTemplate>

    <DataTemplate>

        <ComboBox Grid.Row="0"
                    Grid.Column="1"
                    ItemsSource="{Binding Source={StaticResource actions}}"
                    Style="{StaticResource comboBoxStyle}"
                    IsEnabled="True"
                    Width="200"
                    Margin="2">

            <ComboBox.ItemTemplate>
                <DataTemplate>

                    <TextBlock>

                        <Hyperlink Style="{StaticResource HyperlinkStyle}">

                            <TextBlock Text="{Binding Converter={StaticResource enumDescConverter}}"
                                        FontSize="14"/>

                                <i:Interaction.Triggers>
                                    <i:EventTrigger EventName="Click">
                                        <i:InvokeCommandAction Command="{Binding ElementName=dispatchControl, Path=DataContext.ExecuteActionCommand}"
                                                                CommandParameter="{Binding}"/>
                                    </i:EventTrigger>
                                </i:Interaction.Triggers>

                        </Hyperlink>

                    </TextBlock>

                </DataTemplate>

            </ComboBox.ItemTemplate>

        </ComboBox>

    </DataTemplate>

</DataGridTemplateColumn.CellTemplate>

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

Richard Deeming19-Aug-21 21:35

Re: Disable ComboBox Hyperlinks

19-Aug-21 21:35

What's wrong with binding the IsEnabled property on the Hyperlink to a property on your view-model?

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Kevin Marois20-Aug-21 4:36

Re: Disable ComboBox Hyperlinks

20-Aug-21 4:36

It would need to be bound to a property on the entity - except there is no entity. I'm loading the combo box with enums.

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

Matt T Heffron25-Aug-21 11:08

Matt T Heffron

25-Aug-21 11:08

Use a DataTemplateSelector as the ComboBox.ItemTemplateSelector.
The SelectTemplate() method will be passed each item, (the enum in your case).
Select a data template specific to each case you want.

"Fairy tales do not tell children the dragons exist. Children already know that dragons exist. Fairy tales tell children the dragons can be killed."
- G.K. Chesterton

WPF DataGrid - Stretch Row Details Vertically

Kevin Marois29-Jul-21 7:39

Get MainWindow from Executing Assembly

29-Jul-21 7:39

I've got Row Details section in a DataGrid. The DataGrid's width is set to 1500, yet the row details content stretches off the right side of the grid. Here's all the XAML.

Here's a screen shot

How do I make the Row Details content wrap?

<DataGrid x:Name="seqSheetDataGrid"
          Grid.Row="1"
          Grid.Column="0"
          ItemsSource="{Binding SequenceSheets, Mode=TwoWay}"
          SelectedItem="{Binding SelectedSequenceSheet, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
          RowDetailsVisibilityMode="Visible"
          behaviors:SortDescriptionBehavior.Property="SeqSheetGridSortDescription"
          MaxWidth="1700">

    <DataGrid.Resources>
        <Style TargetType="DataGridCell" BasedOn="{StaticResource dataGridCellStyle}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Status}" Value="Removed">
                    <Setter Property="FontStyle" Value="Italic" />
                    <Setter Property="Foreground" Value="LightGray" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </DataGrid.Resources>

    <DataGrid.RowStyle>
        <Style TargetType="DataGridRow"
               BasedOn="{StaticResource dataGridRowStyle}">
            <Setter Property="BorderBrush" Value="SteelBlue" />
            <Setter Property="BorderThickness" Value="0,0,0,1" />
            <Setter Property="Height" Value="{x:Static sys:Double.NaN}"/>
        </Style>
    </DataGrid.RowStyle>

    <DataGrid.Style>
        <Style TargetType="DataGrid"
               BasedOn="{StaticResource dataGridStyle}">

            <Setter Property="IsReadOnly" Value="True" />
            <Style.Triggers>
                <MultiDataTrigger>
                    <MultiDataTrigger.Conditions>
                        <Condition Binding="{Binding AreFieldsEnabled}" Value="True" />
                        <Condition Binding="{Binding Job.ContractDate, Converter={StaticResource IsNotNullConverter}}" Value="True" />
                        <Condition Binding="{Binding Job.ContractDateInitials, Converter={StaticResource IsNotNullConverter}}" Value="True" />
                    </MultiDataTrigger.Conditions>

                    <MultiDataTrigger.Setters>
                        <Setter Property="IsReadOnly" Value="False" />
                    </MultiDataTrigger.Setters>
                </MultiDataTrigger>
            </Style.Triggers>
        </Style>
    </DataGrid.Style>

    <DataGrid.Columns>

        <DataGridTextColumn Header="Sequence"
                            Binding="{Binding Sequence, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                            Width="120"
                            SortDirection="Ascending"
                            SortMemberPath="Sequence"
                            IsReadOnly="True"/>

        <DataGridTextColumn Header="Lot's / Bldgs"
                            Binding="{Binding Lot, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                            Width="120"
                            SortMemberPath="Lot"
                            IsReadOnly="True"/>

        <DataGridTextColumn Header="Plan"
                            Binding="{Binding Plan, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                            Width="120"
                            SortMemberPath="Plan"
                            IsReadOnly="True"/>

        <DataGridTextColumn Header="Square Feet"
                            Binding="{Binding SquareFeet, StringFormat={}{0:#,#}, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                            Width="120"
                            HeaderStyle="{StaticResource dataGridRightAlignColHeaderStyle}"
                            SortMemberPath="SquareFeet"
                            IsReadOnly="True">

            <DataGridTextColumn.ElementStyle>
                <Style>
                    <Setter Property="TextBlock.TextAlignment" Value="Right" />
                </Style>
            </DataGridTextColumn.ElementStyle>

        </DataGridTextColumn>

        <DataGridTextColumn Header="Elevation"
                            Binding="{Binding Elevation, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                            Width="120"
                            SortMemberPath="Elevation"
                            IsReadOnly="True"/>

        <DataGridComboBoxColumn Header="Garage Type"
                                SelectedValueBinding="{Binding GarageTypeId}"
                                SelectedValuePath="Id"
                                DisplayMemberPath="Caption"
                                Width="120"
                                SortMemberPath="GarageTypeId"
                                IsReadOnly="True">

            <DataGridComboBoxColumn.ElementStyle>
                <Style TargetType="{x:Type ComboBox}">
                    <Setter Property="ItemsSource" Value="{Binding ElementName=jobView, Path=DataContext.GarageTypes}" />
                </Style>
            </DataGridComboBoxColumn.ElementStyle>
            <DataGridComboBoxColumn.EditingElementStyle>
                <Style TargetType="{x:Type ComboBox}">
                    <Setter Property="ItemsSource" Value="{Binding ElementName=jobView, Path=DataContext.GarageTypes}" />
                </Style>
            </DataGridComboBoxColumn.EditingElementStyle>

        </DataGridComboBoxColumn>

        <DataGridTextColumn Header="Enhanced Rear"
                            Binding="{Binding EnhancedRear, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource TrueFalseYesNoConverter}}"
                            Width="120"
                            SortMemberPath="EnhancedRear"
                            IsReadOnly="True"/>

        <DataGridTextColumn Header="Enhanced Left"
                            Binding="{Binding EnhancedLeft, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource TrueFalseYesNoConverter}}"
                            Width="120"
                            SortMemberPath="EnhancedLeft"
                            IsReadOnly="True"/>

        <DataGridTextColumn Header="Enhanced Right"
                            Binding="{Binding EnhancedRight, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource TrueFalseYesNoConverter}}"
                            Width="120"
                            SortMemberPath="EnhancedRight"
                            IsReadOnly="True"/>

        <DataGridTextColumn Header="Address"
                            Binding="{Binding Address, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                            Width="400"
                            SortMemberPath="Address"
                            IsReadOnly="True"/>

        <DataGridTextColumn Header="Status"
                            Binding="{Binding Status, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                            Width="150"
                            SortMemberPath="Status"
                            IsReadOnly="True"/>

    </DataGrid.Columns>

    <DataGrid.RowDetailsTemplate>
        <DataTemplate>

            <StackPanel Orientation="Horizontal">

                <TextBlock Text="Options: "
                           FontWeight="Bold"
                           Margin="2" />

                <TextBlock Text="{Binding OptionsText}"
                           TextWrapping="Wrap"
                           Margin="2" >
                    <TextBlock.Style>
                        <Style TargetType="TextBlock">
                            <Style.Triggers>
                                <DataTrigger Binding="{Binding Status}" Value="Removed">
                                    <Setter Property="FontStyle" Value="Italic" />
                                    <Setter Property="Foreground" Value="LightGray" />
                                </DataTrigger>
                            </Style.Triggers>
                        </Style>
                    </TextBlock.Style>
                </TextBlock>

            </StackPanel>

        </DataTemplate>

    </DataGrid.RowDetailsTemplate>

</DataGrid>

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

modified 29-Jul-21 13:48pm.

Kevin Marois23-Jul-21 8:59

Re: Get MainWindow from Executing Assembly

23-Jul-21 8:59

Is it possible to get the MainWindow from the exeucting assembly?

I am opening a dialog contained in another assembly and in that dialog I want to set the Owner to the Main Window of my executing app.

I know in the dialog I can do

var callingAssembly = Assembly.GetCallingAssembly();

which gives me the assembly of my main app. But Can I then somehow get access to that assembly's Application.Current.MainWindow?

What I'd really like, in my dialog, is something like this:

public MyDialog()
{
    var window = //??? Get the calling assembly's Application.Current.MainWindow

    this.Owner = window;
}

Thanks!

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

modified 23-Jul-21 15:42pm.

Richard Deeming27-Jul-21 23:18

Re: Get MainWindow from Executing Assembly

27-Jul-21 23:18

Assuming you're not using a separate AppDomain to load the assembly, Application.Current.MainWindow should still work from the other assembly.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Kevin Marois28-Jul-21 10:04

Can anyone recommend a free WPF editor control?

28-Jul-21 10:04

OK, that worked. Thanks

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

Mike Hankey23-Jul-21 4:25

Mike Hankey

23-Jul-21 4:25

I'm looking at a couple editors but have not used them.

smithhtmleditor on CodePlex Archive[^]
GitHub - ngaillet/WPF-RichText-Editor: WPF RichText Editor Control with conversion from and to HTML (XAML)[^]

Has anyone used either of these?

[ed. Moved]

The less you need, the more you have.

Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?

JaxCoder.com

modified 23-Jul-21 11:36am.

Slacker00723-Jul-21 4:39

Slacker007

23-Jul-21 4:39

Not sure why you would not use Visual Studio Community Edition to manage/edit your WPF files and projects. that has everything, and is free. Visual Studio Community 2019 - Free IDE and Developer Tools[^]

But, if Visual Studio is out of the question, then there is always this:

Building WPF Applications in Visual Studio Code with PowerShell[^]

if you just want to edit the actual xaml files then Visual code should be good.

both are free as far as I know.

youtube video: Building WPF Applications in Visual Studio Code with PowerShell - YouTube[^]

modified 23-Jul-21 10:45am.

Richard Andrew x6423-Jul-21 4:45

Richard Andrew x64

23-Jul-21 4:45

Slacker007 wrote:
Not sure why you would not use Visual Studio Community Edition to manage/edit your WPF files and projects.

Perhaps Mike is secretly part of a large, enterprise development team.

The difficult we do right away...
...the impossible takes slightly longer.

Mike Hankey23-Jul-21 4:50

Mike Hankey

23-Jul-21 4:50

What I'm looking for is a control I can slip into my app. Guess I didn't make that plain.

The less you need, the more you have.

Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?

JaxCoder.com

Re: Can anyone recommend a free WPF editor control?

Slacker00723-Jul-21 5:01

Slacker007

23-Jul-21 5:01

Sorry, Mike. I did not notice.

Richard Deeming27-Jul-21 23:16

Re: Can anyone recommend a free WPF editor control?

27-Jul-21 23:16

Looks like the SmithHtmlEditor project has moved to GitHub:
GitHub - adambarath/SmithHtmlEditor: The source code is about html editor usage in WPF application.[^]

It doesn't seem to have much detail there, and is still pointing to the (now defunct) CodePlex archive for more information. But the GitHub version seems to have been updated more recently.

There don't seem to be a huge number of other options - there's this one[^] from 2015, and this one[^], also from 2015, but beyond that Google is only suggesting commercial products.

I've not tried it, but you might have better luck embedding a WebView2[^] control and using a Javascript HTML editor.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Mike Hankey28-Jul-21 2:05

Mike Hankey

28-Jul-21 2:05

Thanks Richard,

I considered the CodeProject one but settled on the smithhtmleditor. Seems to be working Ok, a little quirky with fonts but other than that fairly easy to use. All I need is some basic editing for keeping notes in the app I'm working on.

The less you need, the more you have.

Even a blind squirrel gets a nut...occasionally.

JaxCoder.com

Installing Test Mode vs Production Mode

Kevin Marois19-Jul-21 8:55

19-Jul-21 8:55

I'm working on a WPF app that we now want to have a 'Test Mode'.

Right now, I have an 'IsTestMode' property in the app.config. If I set it to True, then the login window's border is red, and there's a red TEST MODE banner across the top of the main window. The Test Mode copy is installed in a different location then the production copy.

In the code behind of the Main Window I have:

Uri iconUri = null;
if (AppCore.IsTestMode)
{
    iconUri = new Uri("my_test.ico", UriKind.Relative);
}
else
{
    iconUri = new Uri("my.ico", UriKind.Relative);
}

this.Icon = BitmapFrame.Create(iconUri);

This changes the Taskbar Icon, not the desktop icon

This all works fine.

Now I want to add an installer project, but I'm stuck on how to make the Test Mode changes during installation. I'd like to do the following during installation and not let the user change them:

Set the installation location
Set the IsTestMode setting
Change the desktop icon.

Can anyone shed some light on how to do this?

Thanks

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

modified 19-Jul-21 15:14pm.

Routed Event Args Null

Kevin Marois28-Jun-21 16:28

Re: Routed Event Args Null

28-Jun-21 16:28

I have a user control with a custom Routed Event. I'm trying to pass event args:

public class NavigationViewFilterEventArgs : RoutedEventArgs
{
    public List<LookupEntity> StatusFilters { get; private set; }

    public List<LookupEntity> FilterItems { get; private set; }

    public NavigationViewFilterEventArgs(RoutedEvent e, List<LookupEntity> statusFilters, List<LookupEntity> filterItems) :
        base(e)
    {
        StatusFilters = statusFilters;
        FilterItems = filterItems;
    }
}

Here's the UserControl code behind:

public static readonly RoutedEvent FilterExecutedEvent =
            EventManager.RegisterRoutedEvent("FilterExecuted",
            RoutingStrategy.Bubble,
            typeof(RoutedEventHandler),
            typeof(NavigationView));

public event RoutedEventHandler FilterExecuted
{
    add { AddHandler(FilterExecutedEvent, value); }
    remove { RemoveHandler(FilterExecutedEvent, value); }
}

private void RaiseFilterExecutedEvent()
{
    var args = new NavigationViewFilterEventArgs(FilterExecutedEvent, StatusFilters, FilterItems);
    RaiseEvent(args);
}

The control is on the Main Window:

<ctrls:NavigationView Grid.Row="7" 
                        Caption="Companies"
                        StatusFilters="{Binding DataContext.CompanyStatusFilterItems, 
                                                ElementName=window, Mode=TwoWay, 
                                                UpdateSourceTrigger=PropertyChanged}">

    <i:Interaction.Triggers>
        <i:EventTrigger EventName="FilterExecuted">
            <i:InvokeCommandAction Command="{Binding DataContext.CompanyFilterExecutedEventCommand, 
                                                        ElementName=window}"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>

</ctrls:NavigationView>

And finally the handler in the Main Window view model:

private ICommand _CompanyFilterExecutedEventCommand;
public ICommand CompanyFilterExecutedEventCommand
{
    get
    {
        if (_CompanyFilterExecutedEventCommand == null)
            _CompanyFilterExecutedEventCommand = new RelayCommand<NavigationViewFilterEventArgs>(p => CompanyFilterExecutedEventExecuted(p), p => CompanyFilterExecutedEventCanExecute());
        return _CompanyFilterExecutedEventCommand;
    }
}

private bool CompanyFilterExecutedEventCanExecute()
{
    return true;
}

private void CompanyFilterExecutedEventExecuted(NavigationViewFilterEventArgs args)
{
}

When I run this and click the button, the event reaches the Main Window VM's CompanyFilterExecutedEventExecuted method, but the param is always null.

I could use some help here.

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

Richard Deeming28-Jun-21 22:34

How to change background color in combobox in code behind?

28-Jun-21 22:34

The problem isn't that the EventArgs object is null; it's that the EventArgs object isn't being passed as the command parameter to your RelayCommand.

If you're using the Microsoft.Xaml.Behaviors.Wpf[^] package, you need to set PassEventArgsToCommand="True" on your <i:InvokeCommandAction> element.

If you're using Prism, that will pass the event args automatically if the command parameter is not set. But that would use a different namepsace prefix on the InvokeCommandAction element.
6: Advanced MVVM Scenarios Using the Prism Library 5.0 for WPF | Microsoft Docs[^]

Other platforms will have different approaches. There are quite a few documented on this SO thread:
wpf - MVVM Passing EventArgs As Command Parameter - Stack Overflow[^]

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Cường Nguyễn Văn 202123-Jun-21 6:56

Cường Nguyễn Văn 2021

23-Jun-21 6:56

I want to change the combobox's backgound but when set the default background it doesn't change, I want to change the background color in the code behind, thank!

Make textbox fill up and resizie

Acuena21-Jun-21 20:59

Acuena

21-Jun-21 20:59

Hi!
Sorry for weird subject but was a bit unsure on what to call it.

Anyway, I have a WPF-form where I have some items below a textbox. I want the textbox to fill up the grid above the bottom controls but leave space for them.

<Window x:Class="SMS_Sender_3._0.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:SMS_Sender_3._0"
        mc:Ignorable="d"
        Title="SMS Sender 3.0" Height="350" Width="525">
    <Grid>
        <Border Margin="8">
            <StackPanel>

                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="50" />
                        <ColumnDefinition Width="*" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Grid.Column="0" Text="Phone:" />
                    <TextBox Grid.Column="1" />
                </Grid>

                <TextBlock Text="Message:" />

                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="50" />
                        <ColumnDefinition Width="*" />
                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="225" />
                    </Grid.RowDefinitions>

                    <TextBox Grid.Column="1" />
                </Grid>

                <Grid Margin="0,3,0,0">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="50" />
                        <ColumnDefinition Width="150" />
                        <ColumnDefinition Width="60" />
                        <ColumnDefinition Width="*" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Grid.Column="0" Text="Mall:" />
                    <ComboBox Grid.Column="1" />
                    <TextBlock Margin="5,0,0,0" Grid.Column="2" Text="0/160(1)" />
                    <Button Grid.Column="3" HorizontalAlignment="Right" Content="_Send" Width="100" />
                </Grid>
                <Grid Margin="0,3,0,0">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="50" />
                        <ColumnDefinition Width="*" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Grid.Column="0" Text="Type:" />
                    <ComboBox Grid.Column="1" HorizontalAlignment="Left" Width="150" />
                </Grid>
            
            </StackPanel>
        </Border>
    </Grid>
</Window>

As it is now, the textbox will change it width but not it's height, due to it being set to 225 in the grid definition. However, I am unsure how to set the grid so that it will take up the space but leave the bottom controls visible. Basically I want it to be as it is now but able to resize.

I am thankfull for any suggestions.

Have a nice day!
I am using JetBrains Rider!

Re: Make textbox fill up and resizie

Richard Deeming21-Jun-21 21:58