Wpf datatemplate datacontext Since we don't know actual code of your UserControl and VM, I will show this by samples. Is there a way to explicitly set the source on the CVS to the current DataContext of the DataTemplate? Again, should be assumed but this isn't working for Just DataTemplate. Now every DataTemplate can bind to its item in its data context. Improve this question. When I attempt to specify multiple DataTemplates for use by a ContentControl so that the correct one (based on Type) is used, I end up with Content that is simply the Content's ToString() value. class MainViewModel { public Class1 C1 { get; set; } public Class2 C2 { get; set; } public MainViewModel() { C1 = new Class1 { S1 = "This is C1 data context" }; C2 = new Class2 { S2 = "This is C2 data context" }; } } In XAML: I need a way to access in XAML 'MyIndex' from within the ItemTemplate of the ListView so that I can change aspects of each ListViewItem based on the value of MyIndex. The DataContext for the popup comes from the PlacementTarget, which is how the bindings work most of the time, despite the popup not being part of the tree. Then the DataContext for the individual instance of the UserControl becomes the instance of the object. kramer said, you need to remove the RelativeSource from your bindings for the SelectedItem and SelectedValue like this (notice that you should add Mode=TwoWay to your binding so that the change in the combobox is reflected in your model). The most common ones are ElementName or RelativeSource, which will find another UI element in the VisualTree so you can bind to it's properties. 8. <ContentPresenter Content="{Binding UserControlViewModel}" /> <Button Content="View" Comamnd="{Binding SwitchToViewCommand}"/> <Button Content="Edit" Comamnd="{Binding SwitchToEditCommand}"/> ! Don't forget to set the DataContext for your window to your However it's not really safe and in this case the implicit DataContext is actually the Content you set for your ContentControl (this DataContext flows down from the DataTemplate through the UserControl's Template). 0. (jus string) and dataType to 'ViewModel1' so they won't match. Notice that none of the How can I access the root DataContext in a DataTemplate in WPF? 1. Each item is used to draw image which has a ContextMenu. The XAML usage for contents of a data template is not exposed as a settable code property. public class AgentsDC { public List<Agent> Agents { get; set; } } 2 - Give this class as DataContext. public partial class App : Application { private void OnStartup(object sender, StartupEventArgs e) { // Create the ViewModel and expose it using the View's DataContext MainView mainView = new MainView(); I would probably suggest using an MVVM approach. What I would like to do, is set the DataContext of these controls to a property of my main I have a DataGrid with 2 columns. WPF controls have built-in functionality to support the customization of data presentation. So you have to use <Window. When "View shapes" is checked, we're changing data template to a new one --> <DataTrigger Binding="{Binding IsChecked, ElementName=ViewSelector I have a contentcontrol that is bound to an object (data property of DataContext in the example). ItemTemplate> <DataTemplate> You can use a RelativeSource binding to find the TreeView, then bind to it's DataContext. I created a simple demo about how to map the datatype and data template in UWP through DataTemplateSelector. e. What is happening is that someone thought it would be cool to be able to set the Content of a control to a DataTemplate based on a data type (i. This property represents another The problem is that setting ContentControl. The RelativeSource binding finds a lowest ancestor of the type specified with AncestorType, i. However, in some cases the DataContext is not accessible: it happens for elements that are not part of the visual or logical tree. The DataContext of the DataTemplate will automatically be set to an instance of the type specified in the DataType property. Where do you actually set datacontext (ViewModles) for views ? – IronHide. TreeHelper. That's the point of a grid. I'm not sure what else I can try. It flows into the UserControl and its child controls like any other UIElement receives the DataContext of its parent control. All datacontexts within the content worked. This is some demo code to show the issue. But the proper way would have been : 1 - Create a DataContext. In below sample specifically to a command in the general data context using command parameter to identify on which item it is initiated. WPF: Inject DataContext into DataTemplate View. a panel holding a separate form or something along those lines. I've tried wrapping this into a StaticResource as suggested here, but it doesn't work with some complex types, such as nesting another DataTemplate within my DataTemplate. Most of the previous solutions are focused on setting the run time DataContext. All data can be obtained from DataContext of ItemControl (and this markup Tag=" WPF TemplateBinding to DataContext of Each element needs to be added to the current visual tree. The binding will go in each individual tabVM, you have a list of BaseTabVMs in the main window view model to bind to and all items You can use a RelativeSource binding to find the TreeView, then bind to it's DataContext. Resources> <DataTemplate x:Key="linkTemplate"> <TextBlock> <Hyperlink> <TextBlock Text="{Binding Value. The items however need to bind to something from the container control. Like this: public override DataTemplate SelectTemplate(object item, DependencyObject container) { var _Container = Library. This allows you to do stuff like having a global DataContext on the window and then a more local and specific DataContext on e. I can't bind the command because inside the DataTemplate, the datacontext is not the ViewModel but an item of the ObservableCollection. In short, the data DataContext is inherited to all lower Elements of the XAML and to all the XAML of UserControls unless it is overwritten somewhere. For example if list has two objects like in my WPF-application i have multiple Views in a main window and i tried to implement a navigation between those. Only thing I can think of is that the CVS doesn't know the correct source for the binding (your 'FooList' member) which should be the DataContext at this level. I can get the data to display properly, but I am unable to change the list data through the UI. For example, the following uses ElementName to tell the binding that it should use MyGridView as the binding The DataContext property in WPF is extremely handy, because it is automatically inherited by all children of the element where you assign it; therefore you don’t need to set it again on each element you want to bind. I have a control that has a child ContentControl whose view is set through a DataTrigger and DataTemplate. It also shows you how to create a datatemplate that allows you to require WPF to utilize this converter by default, something like this: Since each control has its own DataContext property, you can easily break the chain of inheritance and override the DataContext with a new value. However, this is limited to the properties of the Binding object itself. DataContext> syntax. Therefore, when setting this property, you also need to set the Content property to some sort of data source: <TabControl> <TabItem ItemsSource is binded directly to your Datacontext (which is your list) And then you tell to your ListBox to display the property Category. DataContext = new AgentsDC(); You must be trying to use your DataTemplate as ContentTemplate for your ContentControl. 1k次，点赞12次，收藏45次。RelativeSource 是一个标记扩展，扩展描述相对于绑定目标位置的绑定源位置。RelativeSource 作用是改变绑定指向的源，默认使用绑定的源是对应的DataContext对象中的属性， Mar 21, 2011 · The DataContext property in WPF is extremely handy, because it is automatically inherited by all children of the element where you assign it; therefore you don’t need to set it again on each element you want to bind. When it comes to Views and The DataContext property in WPF is extremely handy, because it is automatically inherited by all children of the element where you assign it; therefore you don’t need to set it @Ashish: you can set the DataContext to the ViewModel itself, but you set the DataTemplate to a template that displays the ViewModel - not to the viewmodel itself. Gets or sets the data template used to display the content of the ContentControl. The ListView. I host a list of 64 UserControl in an ItemsControl, the DataContext is an array of objects. xaml. DataContext> <local:MainVM HeaderText="Jabberwocky" /> </Window. In this example, we'll do a bunch of custom formatting in each item, just to show you how flexible this Using relative source bindings, you can effortlessly access the parent DataContext in WPF Data Binding. I am talking about having a ContentControl inside the Template without setting Content like this Content = Here is an easy way which involves no external libraries, no additional housekeeping classes and interfaces, almost no magic, and is very flexible because you can have viewmodels that contain other viewmodels, and you get to instantiate each one of them, so you can pass constructor parameters to them: I have a WPF Window with a view model set as its DataContext, and have a ListBox with a DataTemplate and its ItemsSource bound to the view model, like in the following example: Team declaration to the Window. 4. AutoWireViewModel property. You don't have to specify vm:Tab1ViewModel new instance in your XAML. 126. Access parent DataContext from DataTemplate. Then the workaround to get the DC of the parent is use a At first I had the content as simply XAML following the <TabItem line. DataContext. First, you can try using RelativeSource to travel Visual tree and get root element DataContext. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog wpf; datatemplate; datacontext; Share. ToString() of the object, however DataTemplates can be used to tell WPF how to render the object. ViewModelBase to my class (and RaisePropertyChanged by property), and, Grid of my DataTemplate has DataContext="{Binding DataContext, RelativeSource={RelativeSource AncestorType=ContentControl}}", and the binding targeted only the property name (Visibility or Message). Is there something else that I need to do to get the DataContext to work? xaml: you should set the Content Property to your CurrentWorkspace. But when you change the PlacementTarget this overrides the default, and now the DataContext is coming from the new PlacementTarget, whatever it may be. < I'm learning WPF and the MVVM Pattern and I'm trying to build a calendar-like view. How can I do The TabVMs could inherrit from a BaseTabVM where all common things are in and eventually, create a data template for each tab view model in the resource of your project so that they can be individually customized. Just have a property in your DataContext to bind, like ScreenNumber for example. In WPF, how to databind to the Window DataContext from inside the DataTemplate of a contained ListBox? 2. Is it possible to have DataTemplate composition or inheritance (similar to "BasedOn" in Styles)? There are 2 instances where I need that. DataContext = this; // refers to containing <Grid> in XAML Constructor of UserControl I'm trying to embed, the one whose Design view loads okay: InitializeComponent(); grd_templateDetail. Any idea? So obviously I am doing something wrong, but I just cannot seem to get the HierarchicalDataTemplate (or even just DataTemplate) to work when using the DataType property. Because of the ItemTemplate is using a DataTemplate, the DataContext of upper levels is not directly accessible. And I want not only change style of my tabs, but also change its datacontext and controls. TryFindParent<MyUserControl>(container); InitializeComponent(); grd_templateList. So the best bet is bind to the visual parent's datacontext via a RelativeSource direct binding such as: {Binding TabName, RelativeSource={RelativeSource Mode=FindAncestor, 文章浏览阅读1. Modified 8 years, 5 months ago. Since the context menu is actually in its own window, binding is a bit trickier. Hot Network Questions Okay. Using an ItemsControl inside of a You are using the ContentTemplate property incorrectly. on the type of a ViewModel. So the Binding can be just simple like this: <TextBlock Text="{Binding}"></TextBlock> I have two usercontrols inside of a TabItem. You can recurse up the tree to get to your UserControl and you then have access to that controls properties and DataContext. Problem with this code is before the I'd like to move that XAML to a template and apply via a Style to to ContentControls in all four of them. Part of the XAML: <TabItem x:Name="TSTabItem" Header="Test Search" ContentTemplate="{StaticResource PlayerDetails}" > </TabItem> The PlayerDetails datatemplate is a copy of the content that I first used and all TextBlock fields show so I know it is being used. DataContext> You are using the ContentTemplate property incorrectly. Viewed 665 times 1 . ContextMenu breaks the DataContext inheritance chain, that's why ElementName=currentContent cannot be found. It can be very difficult then Assume that the user control is a page of LayoutFarmeControl (with DataContext LayoutFrame). This Metadata item is inherited as DataContext to the UserControl that is inside this DataTemplate. GridControl DataSource="{Binding RelativeSource={RelativeSource Path=DataContext, TraceLevel=High}" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" >  <Window. MvvmLight. This approach can also be seen here (option 8). <DataGridTemplateColumn Header="House Owner"> There are some binding properties you can use to specify a different Source for your binding than the default DataContext. How specify object in datagrid binding. Binding to properties of viewmodel from datatemplate. ItemTemplate I have a button and I want to use the command. It can be very difficult then WPF binding inside DataTemplate Hot Network Questions Does gravity from a star go through a black hole's event horizon to affect objects on the other side? How can I bind to the Item's DataContext in the ItemsControl from within a nested data template (a data template of a control within the item's data template)? I can't use TemplatedParent, because it's double templated. DataContext></Window. For example, TabView1 has TextBoxes and DataGrid that are binded to ViewModel1 and ObservableCollection1. Content> <Binding Visual Studio 2010 will support intellisense on Bindings. Look here for artificial inheritance context and use the Create a UserControl as View and a DataTemplate for the sub ViewModel to select this View; If a sub view model needs to be presented, it is done via a DataTemplate. So I suppose your item does have a property "ParentInEditMode"; there should be no issue with binding to that property. 5k次。原因：我在datatemplate中使用命令，这些命令全部来自于ViewModel中。这些命令却始终无法生效，后来发现根本就没有绑定上。查了很久发现datatemplate中是无法访问到datatemplate控件层以外的资源，包括ViewModel中的命令。原代码： _wpf datatemplate datacontext parent You can't assign DataContext as DataContext="{Binding Employee}" because it's a complex object which can't be assigned as string. There is no magic involved in the DataTemplates are used all over WPF (seriously, you should take a look into how awesome data templating is in ListViews if you don’t believe me). <DataGridTemplateColumn Header="House Owner"> I have a context menu. xaml: I'm having the same problem. Lews Therin Lews Therin. WP7 ContentPresenter passing DataContext to DataTemplate. From the ContentControl. Confusion with Bindings & DataContext in ContentTemplate. the DataContext of its descendants (the visual tree built from the DataTemplate) is actually be the Content of the ContentControl Content="{Binding}" After that, the UserControls worked fine and had the same UPDATE: Example of binding to control DataContext Property in different datatemplate. If the DataContext property for the object hosting the binding isn't set, As shown in the example in the previous section, the ContentControl explicitly uses the detailsProductListingTemplate data template. The question is: How can I bind the button to the command if a lost the parent datacontext? The DataTemplate for the Metadata type is loaded. DataContext = this; Just have a property in your DataContext to bind, like ScreenNumber for example. WPF: Accessing the DataContext's "DataTemplate" 0. Consider this code. So the main window xaml looks something like this: This brief article explains the two ways of setting the DataContext: through XAML or through code. I am trying to successfully TwoWay bind an ObservableCollection to TextBoxes in a DataTemplate. Therefore, when setting this property, you also need to set the Content property to some sort of data source: <TabControl> <TabItem The binding issue for a template is that once rendered as individual control will, depending on the control find its parent's data context, not from the visual tree but from its logical tree. Use a relative source binding: Text="{Binding RelativeSource={RelativeSource AncestorType=ContentControl}, Path=Content}" Edit: I probably should note that, in terms of what the binding targets, this is equivalent to {Binding}, as the DataContext in the ContentTemplate is the Content. For example after typing "{Binding " into the XAML editor I then get intellisense on the remaining properties (Path, ElementName, etc. DataContext, RelativeSource={RelativeSource Self}}" as default. Therefore, the properties that the DataTemplate has access to will also depend on the type specified in the DataType property. Datacontext of ControlTemplates. The objects have a boolean variable called Exists, this is a DataTemplate trigger to determine if the Usercontrol will be displayed or not. I am having some trouble figuring out how to set the correct DataContext on a ContextMenu. So I currently have a Grid with 6 rows and 7 columns. Parent property of the ListViewItem in the binding as . Here's an example of a Border control whose Content can be changed dynamically (e. Window1" xmlns Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog In WPF there is a way to set multiple Datatemplat Skip to main content. Neither do you need to define the DataContext explicitly. public class MyData { public string Name { get; set; } public string Priority { get; set; } } In your example, the DataContext of the UserControl would be the currently selected Card. For each Item in ItemsSource, ItemsControl creates the specified DataTemplate and to its DataContext it assigns the respective Item. Different Views: for the same class I want to define a To answer mm8's question, as I have just started working with WPF and MVVM, I have always assumed that if the View's DataContext is binded to the corresponding ViewModel, the instance of the View will be created automatically when a ViewModel instance is created via the xaml Datatemplate in ProductListView. That's why i ask you for help. My items class. Add a comment | 1 Answer Sorted by: Reset to default 10 If you define a DataTemplate Have a converter like follows, public sealed class NullToVisibilityConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { return value == null ? everything is OK. By default WPF draws all items it doesn't know how to draw with a TextBlock showing the . This would work: <ListBox x:Name="MyList" ItemsSource="{Binding CardSet. ). Thank you very much ! – The container is in the logical tree. DataContext=model" <Window x:Class="BindThat. Just set the DataContext property of the window and then bind the ItemsControl. Inside the DataTemplate of the ItemsControl. Add(new Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company There seem to be two main ways to define DataContext in WPF: either in code like this:; App. the DataContext of its descendants (the visual tree built from the DataTemplate) is actually be the Content of the ContentControl Content="{Binding}" After that, the UserControls worked fine and had the same DataContext is a property on FrameworkElement (base class for all WPF Controls) and is implemented as a DependencyProperty. The Control lies in a custom usercontrol, and the ToolbarViewModel is set as context for all of it, like so. The container control has a DataTemplate defined which also contains a ItemsControl with a DataTemplate for the item. So, just remove it from your In other words, the DataContext of the first ListViewItem is set to the first customer, the DataContext of the second ListViewItem is set to the second customer, and so on. ItemTemplate = dt; // Second: create and add the text box to the data template FrameworkElementFactory In a post from the past I wrote about invoking control methods from a DataTemplate. It does not work in scenario like this: To bind to a property on the Presenter or ViewModel attached to the DataContext on the parent view or control from inside a DataTemplate you have to use the RelativeSource property with the value “FindAncestor” and the type of As you said, the DataContext is set to the ViewModel class so the control that you mentioned in XAML will be able to access the public properties of that ViewModel. DataContext and ElementName. ffjebe smdq zjwaf wll eenfr xthhmmn sagbvh frdtdci lrzfsn curtkgj

Wpf datatemplate datacontext. Setting datacontext for a datatemplate item.