Populate ListView using custom DataTemplate and dynamic data - wpf

I have a ListView that I would like to populate in XAML. I'm using a custom DataTemplate to make each ListViewItem added contain a Label and a TextBlock.
The problem is I need to dynamically populate the text of the TextBlock of each ListViewItem with data from a settings property, and I don't know how to create this binding.
Right now I am populating the ListView with an XmlDataProvider, but I can't (or at least can't figure out how to) bind values to the xml data. (I'm not stuck using this method of data population, it's just what I was originally doing when I ran into this problem.)
Basically I need something as follows:
The user enters some data into a text box. That data is saved to user settings. When that happens, the corresponding TextBlock of the ListViewItem in the ListView is updated with the user setting data.
Normally I would bind a TextBlock's text to a user setting as follows:
Text="{Binding Source={x:Static properties:Settings.Default},Path=User_Data_1}"
But how do I do this when the text of the TextBlock is defined in the DataTemplate?
My DataTemplate and XmlDataProvider:
<DataTemplate x:Key="listViewTemplate">
<StackPanel Orientation="Vertical">
<Label x:Name="lblName" Content="{Binding XPath=name}"/>
<TextBlock x:Name="tbValue" Text="{Binding XPath=value}"/>
</StackPanel>
</DataTemplate>
<XmlDataProvider x:Key="PagesData" XPath="Pages">
<x:XData>
<Pages xmlns="">
<page id="page01">
<name>Text file:</name>
<value></value>
<source>Pages/Page_CreateFiles1.xaml</source>
</page>
<page id="page02">
<name>Xml file:</name>
<value></value>
<source>Pages/Page_CreateFiles2.xaml</source>
</page>
<page id="page03">
<name>Memory object database:</name>
<value></value>
<source>Pages/Page_CreateFiles3.xaml</source>
</page>
<page id="page04">
<name>Output database:</name>
<value></value>
<source>Pages/Page_CreateDB.xaml</source>
</page>
</Pages>
</x:XData>
</XmlDataProvider>
My ListView
<ListView x:Name="lvNavigation"
ItemTemplate="{DynamicResource listViewTemplate}"
ItemsSource="{Binding Source={StaticResource PagesData}, XPath=page}"/>

Create a view model with a collection of items
public class Item
{
public string Name { get; set; }
public string Value { get; set; }
}
public class ViewModel
{
public ObservableCollection<Item> Items { get; } = new ObservableCollection<Item>();
}
and set the MainWindow's DataContext to an instance of the view model class
public MainWindow()
{
InitializeComponent();
var vm = new ViewModel();
DataContext = vm;
vm.Items.Add(new Item { Name = "Name 1", Value = "Value 1" });
vm.Items.Add(new Item { Name = "Name 2", Value = "Value 2" });
}
Bind to it like this:
<ItemsControl ItemsSource="{Binding Items}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding Name}"/>
<TextBlock Text="{Binding Value}"/>
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>

Clemmens answer is right, but I just wanted to put it out there that I basically did his approach with a slight modification. I used events to trigger the data change in the listview.
I think it is my own fault though, because I didn't explain my problem well enough. First of all, I wanted to do everything from xaml and I don't think that was possible. Second, I failed to mention that I was using pages in a frame, where the data was coming from the pages and the listview was in my main window that contained the frame. So that's why I ended up using events to communicate between the page and the main window.
So in my main window I've defined my observable collection:
ObservableCollection<NavItem> NavItems = new ObservableCollection<NavItem>();
public MainWindow()
{
InitializeComponent();
NavItems.Add(new NavItem { Name = "Text file:", Value = "", Source = "Pages/Page_CreateFiles.xaml" });
NavItems.Add(new NavItem { Name = "Xml file:", Value = "", Source = "Pages/Page_CreateFiles.xaml" });
NavItems.Add(new NavItem { Name = "Memory object db:", Value = "", Source = "Pages/Page_CreateFiles.xaml" });
NavItems.Add(new NavItem { Name = "Output database:", Value = "", Source = "Pages/Page_CreateDB.xaml" });
lvNavigation.ItemsSource = NavItems;
...
}
"NavItem" is a class that is subscribed to INotifyPropertyChanged. Posting that code will just be a lot, so check out how to do that here: INotifyPropertyChanged
Then in each page I set up an event that I call with the data to send:
public static event EventHandler<NavUpdateMessage> UpdateMessage;
private void OnUpdateMessage(int id, string message)
{
NavUpdateMessage navUpdateMessage = new NavUpdateMessage();
navUpdateMessage.Id = id;
navUpdateMessage.Message = message;
var e = UpdateMessage;
if (e != null)
e(this, navUpdateMessage);
}
With the main window subscribed to that event:
public MainWindow()
{
...
Pages.Page_CreateFiles.UpdateMessage += Pages_UpdateMessage;
Pages.Page_CreateDB.UpdateMessage += Pages_UpdateMessage;
}
private void Pages_UpdateMessage(object sender, NavUpdateMessage e)
{
Dispatcher.BeginInvoke(new Action(() =>
{
NavItems[e.Id].Value = e.Message;
}));
}
I'm sure there's a better, more simple approach to this, but this is what I could figure out. And even though I'm sure no one will see this because this question definitely did not get any traction, please feel free to suggest a better solution so at least I can learn.

Related

How to show the selected item of a WPF binding

C#:
public void SetCompetition(Window wT1)
{
//Add all the Copetition
wT1._competition = new List<Competition>();
wT1._competition.Add(new Competition { Logo = "3.png", Name = "test1", IsSelected = false });
wT1._competition.Add(new Competition { Logo = "3.png", Name = "test2", IsSelected = false });
wT1._competition.Add(new Competition { Logo = "3.png", Name = "test3", IsSelected = false });
wT1._competition.Add(new Competition { Logo = "3.png", Name = "test4", IsSelected = false });
wT1.cboSetupCompetition.ItemsSource = wT1._competition;
wT1.cboSetupCompetition.Items.Refresh();
}
Data Template:
<UserControl.Resources>
<System:Double x:Key="Double1">11</System:Double>
<DataTemplate x:Key="cmbCompetition">
<WrapPanel Height="30" >
<Label Content="{Binding Name}" ></Label>
</WrapPanel>
</DataTemplate>
</UserControl.Resources>
<ComboBox x:Name="cboSetupCompetition" ItemTemplate="{DynamicResource cmbCompetition}" HorizontalAlignment="Left" Margin="29,28,0,0" VerticalAlignment="Top" Width="173" RenderTransformOrigin="0.5,0.591" FontSize="12" Height="22" IsEditable="True" Background="#FFD8D8D8" SelectionChanged="UpdateCompetitionSelection"/>
I have a Combobox with a label and an image and when I select an item I would like to see the same format in the Combobox when it is closed. I am not getting any errors I am seeing the name of the application.Competition(this is my object Model) instead of the values of the image and label.
The SetCopetition is invoked when the application loads.
A TextBox is not able to display a Label and an Image or whatever elements that are in your DataTemplate in it.
Set the IsEditable property of the ComboBox to false and it should work as expected, i.e. your DataTemplate will be applied to the selected item when the ComboBox is closed:
<ComboBox x:Name="cboSetupCompetition" IsEditable="False" ItemTemplate="{DynamicResource cmbCompetition}" HorizontalAlignment="Left" Margin="29,28,0,0" VerticalAlignment="Top" Width="173" RenderTransformOrigin="0.5,0.591" FontSize="12" Height="22" Background="#FFD8D8D8" SelectionChanged="UpdateCompetitionSelection"/>
Your issue has nothing to do with MVVM...
the specific problem as Mn8 spotted is that IsEditable=true forces the combo to display a textbox as the selected item
However you are still thinking winforms not WPF, using code behind to link data into the view causes many problems and instability as quite often this breaks the binding connections which is what is suspected was your problem initially, using a proper MVVM approach will eliminate all these problems
the best overveiw of MVVM i know of is
https://msdn.microsoft.com/en-gb/library/hh848246.aspx
Model
this is your data layer, it handle storage and access to data, your model will handle access to files, databases, services, etc
a simple model would be
public class Model
{
public string Text { get; set; }
public Uri Uri { get; set; }
}
ViewModel
on top of your Model you have your View Model
this manages the interaction of your View with the model
for example here because it uses Prism's BindableBase the SetProperty method notifies the View of any changes to the data, the ObservableCollection automatically notifies of changes to the collection, it also uses Prism's DelegateCommand to allow method binding in the view
public class ViewModel:BindableBase
{
public ViewModel()
{
AddItem = new DelegateCommand(() => Collection.Add(new Model()
{
Text = NewText,
Uri = new Uri(NewUri)
}));
}
private string _NewText;
public string NewText
{
get { return _NewText; }
set { SetProperty(ref _NewText, value); }
}
private string _NewUri;
public string NewUri
{
get { return _NewUri; }
set { SetProperty(ref _NewUri, value); }
}
private Model _SelectedItem;
public Model SelectedItem
{
get { return _SelectedItem; }
set
{
if (SetProperty(ref _SelectedItem, value))
{
NewText = value?.Text;
NewUri = value?.Uri.ToString();
}
}
}
public ObservableCollection<Model> Collection { get; } = new ObservableCollection<Model>();
public DelegateCommand AddItem { get; set; }
}
View
the View ideally does nothing but displays and collects data, all formatting / Styling should be done here
firstly you need to define the data source, the usual way is via the data context as this auto inherits down the visual tree, in the example because i set the window's datacontext, i have also set it for everything in the window the only exception is the dataTempplate as this is set to the current item in the collection
i then bind properties to the datasource
Note the code behind file is only the default constructor no other code at all
<Window
x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApplication1"
Title="MainWindow" Height="350" Width="525">
<Window.DataContext>
<local:ViewModel/>
</Window.DataContext>
<StackPanel>
<GroupBox Header="Text">
<TextBox Text="{Binding NewText}"/>
</GroupBox>
<GroupBox Header="URI">
<TextBox Text="{Binding NewUri}"/>
</GroupBox>
<Button Content="Add" Command="{Binding AddItem}"/>
<ComboBox ItemsSource="{Binding Collection}" SelectedItem="{Binding SelectedItem}">
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Image Source="{Binding Uri}" />
<TextBlock Text="{Binding Text}"/>
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
</StackPanel>
</Window>

How to show nested relationship in TreeView

Struggling with showing nested relationship in my TreeView. Here is the scenario:
In the database I have Category and Account tables. Each category can have zero or more sub-categories so this table has a nested relationship with itself. Each category/sub-category can have zero or more Account in it, there is a one-to-many relation between Category and Account. Simple, isn't it!
On top of my DB, I have EDMX, with Categories and Accounts entities in it and their associations as I mentioned above. For ease of understanding, I have renamed navigation properties so that Categories now has ParentCategory, ChildCategories and Accounts properties in it.
On top of EDMX, I have my ViewModel, which defines a public property named AllCategories. My TreeView will bind to this property. I initialize this property at the startup like this:
using (MyEntities context = new MyEntities())
Categories = context.Categories.Include(x => x.Accounts).ToList();
Finally I use the following HierarchicalDataTemplate to show this stuff:
<HierarchicalDataTemplate DataType = "{x:Type local:Category}" ItemsSource = "{Binding Path=ChildCategories}">
<TreeViewItem Header="{Binding Name}" ItemsSource="{Binding Accounts}" />
</HierarchicalDataTemplate>
<DataTemplate DataType = "{x:Type local:Account}">
<TextBlock Text="{Binding Name}" />
</DataTemplate>
This runs fine and shows categories, sub-categories and accounts in the tree, but the problem is that sub-categories show up not only under their parent category, but also at the root-level. This happens for categories of all depths. What am I doing wrong here?
Note: If I add .Where(x=>!x.ParentID.HasValue) in the VM, it shows only the root category and its immediate children, nothing else.
Edit
Here's what it currently looks like. Everything goes fine up to the dotted white line (I added that line manually for illustration; has nothing to do with WPF). After that, the sub-categories start repeating with their child sub-categories. This process continues over and over till the leaf sub-categories. I believe I understand what's going on here, but don't have a solution for it. For reference, this guy presents a solution of the problem, but he is using DataSets, whereas I'm working with EF and can't translate his solution into my scenario.
The idea is to connect your business data by ObservableCollections and leave your Hierarchical templates simple, so that the treeview won't show duplicate entries.
The sample code shows nested viewmodel relationship and the corresponding hierarchical templates. For simplification, the Root is an ObservableCollection (otherwise you would need to add INotifyPropertyChanged here and selective ItemsSource Binding in the TreeView)
<Window x:Class="MyWpf.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:MyWpf"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<HierarchicalDataTemplate DataType = "{x:Type local:RootItem}" ItemsSource = "{Binding Path=Categories}">
<TextBlock Text="{Binding Header}"></TextBlock>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType = "{x:Type local:CatNode}" ItemsSource = "{Binding Path=Items}">
<TextBlock Text="{Binding Header}"></TextBlock>
</HierarchicalDataTemplate>
</Window.Resources>
<Grid>
<TreeView ItemsSource="{Binding MyRoot}"/>
</Grid>
</Window>
namespace MyWpf
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = this;
MyRoot = new ObservableCollection<RootItem>();
MyRoot.Add(new RootItem());
}
public ObservableCollection<RootItem> MyRoot { get; set; }
}
public class RootItem
{
public RootItem()
{
Categories = new ObservableCollection<CatNode>();
Categories.Add(new CatNode { Header = "Cat1" });
Categories[0].Items.Add("Item11");
Categories[0].Items.Add("Item12");
Categories.Add(new CatNode { Header = "Cat2" });
Categories[1].Items.Add("Item21");
Categories[1].Items.Add("Item22");
}
public string Header { get { return "Root"; }}
public ObservableCollection<CatNode> Categories { get; set; }
}
public class CatNode
{
public CatNode()
{
Items = new ObservableCollection<string>();
}
public string Header { get; set; }
public ObservableCollection<string> Items { get; set; }
}
}

Binding to 2 Datasources

I want to bind my Datatemplate to 2 Datasources, one datasource that will actually define what is in the ListBox and other that will determine how many ListBoxes are there and what Items in the Listbox are selected\checked.
I have following XAML
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<DataTemplate x:Key="TokenListTemplate">
<StackPanel Orientation="Horizontal">
<CheckBox x:Name="chkToken" IsChecked="{Binding Path=IsSelected, Mode=TwoWay}">
<TextBlock Text="{Binding Path=Text}" />
</CheckBox>
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="ItemTemplate">
<Border BorderThickness="1">
<StackPanel Margin="3">
<TextBlock Text="{Binding Path=Header}"/>
<ListBox ItemTemplate="{StaticResource TokenListTemplate}"
ItemsSource="{Binding Path=Tokens}" >
</ListBox>
</StackPanel>
</Border>
</DataTemplate>
</Window.Resources>
<Grid>
<ListBox ItemTemplate="{StaticResource ItemTemplate}"
ItemsSource="{Binding}">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
</Grid>
And this is the codebehind
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
ObservableCollection<DataEntity> _actualObjects;
List<Token> tokens1 = new List<Token>()
{
new Token("1"),
new Token("2"),
new Token("3"),
new Token("4")
};
List<Token> tokens2 = new List<Token>()
{
new Token("11"),
new Token("21"),
new Token("31")
};
_actualObjects = new ObservableCollection<DataEntity>()
{
new DataEntity(tokens1, "A", "1,2,3", 1),
new DataEntity(tokens1, "B", "2,3", 1),
new DataEntity(tokens2, "C", "21,31", 2)
};
DataContext = _actualObjects;
}
class DataEntity
{
public DataEntity(List<Token> tokens, string header, string tokenString, int entityTypeId)
{
Tokens = tokens;
Header = header;
TokenString = tokenString;
EntityTypeId = entityTypeId;
}
public List<Token> Tokens { get; set; }
public String Header { get; set; }
public String TokenString { get; set; }
public int EntityTypeId { get; set; }
}
public class Token
{
public bool IsSelected { get; set; }
public string Text { get; set; }
public Token(string text)
{
this.IsSelected = false;
this.Text = text;
}
}
}
It produces this
I don't want to inject token1 or token2 List into DataEntity object so in other words I want DataEntity constructor to be
public DataEntity(string header, string tokenString, int entityTypeId)
Listbox DataTemplate should select
tokens1 List as datasource for its LisBoxItems if
Dataentity.EntityTypeId = 1
tokens2 List as datasource for its LisBoxItemsif
DataEntity.EntityTypeId = 2
Also TokenString in DataEntity should be bound to items in the Listbox i.e. if Listbox shows 1 2 3 4
and DataEntity for this listbox has its TokenString value set to "1,2,3" then 1 2 3 should be checked in the listbox
I would recommend to create a ViewModel as a layer between your model and the view. In the ViewModel you can arrange the data to fit to the used controls without changing your model.
So the ViewModel could for example split the tokenString of the DataEntity into a list of tokens.
Just Google for MVVM (Model-View-ViewModel) for examples and furter explanations or look here on SO (like MVVM: Tutorial from start to finish?).
You're not thinking about this correctly. You need to create one class (some may call a view model) with the responsibility of providing all of the data that the view (or UI) will need. Therefore, you will need to have one property which holds a collection of type DataEntity (if I understand you correctly) to 'define what is in the outer ListBox' as you say.
Then you need a DataTemplate to describe what should be displayed for each item in the ListBox - your 'ItemTemplate' template. This DataTemplate should have another ListBox inside in which to display your Token objects. Your DataEntity should have something like this property in it:
public List<Token> Tokens
{
get
{
if (EntityTypeId == 1) return tokens1;
else if (EntityTypeId == 2) return tokens2;
}
}
You will then need another DataTemplate for your Token objects - your 'TokenListTemplate' template, but without the StackPanel... the inner ListBox replaces that, eg. if there are two Token objects in one DataEntity object, then that object would show two Checkboxes... you have correctly bound the IsChecked property to the Token.IsSelected property.
This may be complicated, but it is entirely possible. Just start with the first layer and get your DataEntity objects displayed in the outer ListBox using your 'ItemTemplate' template. Once that bit is ok, move on to the inner ListBox. Good luck.

DatagridComboBoxColumn.ItemsSource does not reflect changes from source other than the source bound for datagrid

ComboBox items do not reflect changes made from its source
Here is what I am trying to accomplish:
I have a WPF datagrid that binding to a database table, inside the datagrid there is a combobox(group ID) column bind to one of the columns from the database table; the combobox items are from another table(a list of group ID). The problem now is when the groupd ID list is changed from other table, the combo box items does not take effect.
Can anyone help? Have been stuct for a long time.
Here is XAML code:
<DataGridTemplateColumn Header="Group ID">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding GroupID, Mode=OneWay}"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<ComboBox Name="ComboBoxTeamGrpID" SelectedItem="{Binding GroupID, Mode=TwoWay}" ItemsSource="{StaticResource ResourceKey=GroupIDList}">
</ComboBox>
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
Here is the code for GroupIDList:
public class GroupIDList : List<string>
{
public GroupIDList()
{
try
{
string tmp = ConfigurationManager.AppSettings["DataSvcAddress"];
Uri svcUri = new Uri(tmp);
JP790DBEntities context = new JP790DBEntities(svcUri);
var deviceQry = from o in context.Devices
where o.GroupID == true
select o;
DataServiceCollection<Device> cList = new DataServiceCollection<Device>(deviceQry);
for (int i = 0; i < cList.Count; i++)
{
this.Add(cList[i].ExtensionID.Trim());
}
this.Add("None");
//this.Add("1002");
//this.Add("1111");
//this.Add("2233");
//this.Add("5544");
}
catch (Exception ex)
{
string str = ex.Message;
}
}
}
Here is another problem related, can anyone help? thank you.
It is either because your GroupIdList is a List and not an ObservableCollection, or because you're binding to a StaticResource, which WPF assumes is unchanged so is only loaded once.
Change your List<string> to an ObservableCollection<string> which will automatically notify the UI when it's collection gets changed, and if that still doesn't work than change your ItemsSource from a StaticResource to a RelativeSource binding, such as
ItemsSource="{Binding
RelativeSource={RelativeSource AncestorType={x:Type DataGrid}},
Path=DataContext.GroupIdList}"
Edit
Your parent ViewModel which has your DataGrid's ItemsSource collection should look something like below. Simply add another public property for GroupIdList and have it return your list. Then use the above RelativeSource binding to access it, assuming your DataGrid's ItemsSource is bound in the form of <DataGrid ItemsSource="{Binding MyDataGridItemsSource}" ... />
public class MyViewModel
{
private ObservableCollection<MyDataObject> _myDataGridItemsSource;
public ObservableCollection<MyDataObject> MyDataGridItemsSource
{
get { return _myDataGridItemsSource; }
set
{
if (value != _myDataGridItemsSource)
{
_myObjects = value;
ReportPropertyChanged("MyDataGridItemsSource");
}
}
}
private ObservableCollection<string> _groupIdList = new GroupIdList();
public ObservableCollection<string> GroupIdList
{
get { return _groupIdList; }
}
}
WPF will not poll everytime and check if your list changed. In Order to do this, as Rachel pointed at you should do something like :
public class GroupIDList : ObseravableCollection<string>
EDIT :
Here is my suggestion :
I actually wouldn't do it the way you did. What I do is I create a View Model for the whole grid, that looks like :
public class MyGridViewModel : DependencyObject
Which I would use as data context for my grid:
DataContext = new MyGridViewModel ();
Now the implementation of MyGridViewModel will contain a list of ViewModel that represent my GridRows, which is an ObservableCollection
public ObservableCollection<RowGridViewModel> RowItemCollection { get; private set; }
I will this in my dataGrid as such :
<Grid>
<DataGrid AutoGenerateColumns="False" ItemsSource="{Binding RowItemCollection}" SelectionMode="Extended" SelectionUnit="Cell">
<DataGrid.Columns>
and All you need to do, is to fill in you RowItemColleciton with the correct data, and then bind you Columns to the correct Property in RowGridViewModel...in your case it would look like (but you have to initialize the GroupIDList :
public class RowGridViewModel: DependencyObject
{
public List<String> GroudIDList { get; set;
}
}
Let me if that help

WPF ItemsSource Binding

I have a Datagrid control in my WPF application and I am trying to bind that control to an ObservableCollection property in my Main Window's class. The property I'm trying to bind to is defined as:
private ObservableCollection<RequestResult> m_SentRequests = new ObservableCollection<RequestResult>();
public ObservableCollection<RequestResult> SentRequests { get { return m_SentRequests; } }
My datagrid is in a group by which has the datacontext set to the MainWindow:
<GroupBox Header="Results" Height="275" HorizontalAlignment="Stretch" Margin="0,305,0,0" Name="grpResults" VerticalAlignment="Top" Width="712" DataContext="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=my:MainWindow, AncestorLevel=1}}">
<Grid>
<DataGrid AutoGenerateColumns="False" Height="246" HorizontalAlignment="Stretch" Margin="6,6,6,0" Name="dgResults" VerticalAlignment="Top" ItemsSource="{Binding Path=SentRequests}" DataContext="{Binding}" IsSynchronizedWithCurrentItem="True" />
</Grid>
</GroupBox>
The problem that I'm having is that in the properties window, after I select SentRequests as my ItemsSource, I still can't select the "Edit Property-Bound Columns" option. I get a "You must set ItemsSource before you can perform this action" dialog. I get the same error when selecting "Generate Columns" and "Remove Columns". It's as if I haven't set anything in the ItemsSource property for my Dialog.
I can set AutoGenerateColumns to true though and I see my data get bound though (however, not with the columns I want to show).
I'm very new to WPF and I'm just writing this as a quick test app for testing a windows service.
Any one know what I'm doing wrong here?
I don't believe you need the Path parameter within your itemSource. You should be able to just set the binding as ItemsSource={Binding SentRequests}
You can also bind to the grid item source in code for example if I create a dummy collection:
public class People
{
public string FirstName { get; set; }
public string LastName { get; set; }
public string Age { get; set; }
public string address { get; set; }
public string zip { get; set; }
}
and then populate it
this.AllPeople = new ObservableCollection<People>();
private void FillData()
{
People p1 = new People();
p1.FirstName = "John";
p1.LastName = "Doe";
p1.Age = "24";
p1.address = "123 Main Street";
p1.zip = "11111";
People p2 = new People();
p2.FirstName = "Jane";
p2.LastName = "Smith";
p2.Age = "36";
p2.address = "456 Water Street";
p2.zip = "22222";
People p3 = new People();
p3.FirstName = "Larry";
p3.LastName = "Williams";
p3.Age = "24";
p3.address = "785 Water Street";
p3.zip = "33333";
this.AllPeople.Add(p1);
this.AllPeople.Add(p2);
this.AllPeople.Add(p3);
}
I could then set the items source in the mainpage contsructor or method as:
this.gridviewname.ItemsSource = "AllPeople";
This is probably a result of some of the trickery that the designer does to render without constantly compiling (like skipping code-behind constructors). Try moving your collection to a separate class and use an instance of that as your DataContext (like an MVVM ViewModel). The other class should be able to initialize normally and provide the bound property to the designer.
Have you tryed without the DataContext tags? Both in GroupBox and DataGrid.
EDIT
something like this:
<GroupBox Header="Results" Height="275" HorizontalAlignment="Stretch" >
<Grid>
<DataGrid AutoGenerateColumns="False" Height="246" HorizontalAlignment="Stretch" Name="dgResults" VerticalAlignment="Top" ItemsSource="{Binding Path=SentRequests}" IsSynchronizedWithCurrentItem="True" />
</Grid>
</GroupBox>

Resources