Entity Framework 6 - Knowledge Base (KB)
19 results in tag: data-binding
How do I use a WPF TreeView HierarchicalDataTemplate with LINQ to Entities?
I've got a Page class in my .edmx ADO.NET Entity Data Model file with with Parent and Children properties. It's for a hierarchy of Pages....removed dead ImageShack link - ADO.NET Entity Framework Hierarchical Page Class...This is handled in my SQL databa...
asked by Zack Peterson
WPF TreeView Binding
I've got a class with Parent and Children properties....ADO.NET Entity Framework Hierarchical Page Class http://img148.imageshack.us/img148/6802/edmxxe8.gif...I want to display this hierarchy in a WPF treeview....Here's my XAML......<TreeView Margin="12" ...
asked by Zack Peterson
Databinding ASP.net DropDownList with Entity Framework
I'm trying to bind an ASP.net DropDownList to the results of an entity framework query, while still maintaining multi-tier separation. (i.e. I don't want my UI code to contain query details, nor my Data Layer code to have UI dependencies.) My code-behin...
asked by AndrewCr
Add empty entry to combobox bound to entity list
I use a ComboBox which is bound to a List<> of Entities. How can I add a "Not selected" entry to the combobox? Adding null to the list results in empty combobox.
asked by wRAR
Does an entity model fire an event when its data changes?
I want to be notified when data changes within a particular table, represented by an entity model. Is the model aware of underlying data changes? If it does actually fire an event, how can I subscribe to it?
asked by Morgan Herlocker
Binding Entity Framework objects to a Datagridview C#
I have been trying to bind an Entity Framework object to a DataGridView but I keep hitting dead ends and I can't seem to find my answer anywhere....I can bind the whole of a table (entity) to a gridview and it will allow me to make changes and save those ...
asked by Jimbo James
Bind an ObservableCollection to a ComboBox in WPF
I'm using ...Entity Framework... as my database source and need to convert a ...Linq... query "var" type to an ObservableCollection. I then need to bind the ObservableCollection to a ComboBox on WPF form; binding to ItemsSource, DisplayMemeberPath, Select...
asked by dhamilton
How can I validate DataGridView input?
I have some serious problem with ...DataGridView... input validation:...I'm working on a project with Entity Framework and I've bound a ...DataGridView... element to a database....If the user inserts some data into a non-nullable column, and after that cl...
asked by Masoud Keshavarz
ASP.net MVC4 Multiselect ListBox with Many-to-Many relationship
I'm new to ASP.net, MVC4 and EF and having trouble making the leap from relatively simple samples to something (only slightly) more complex. I have simplified my model for the question here so consider the following. Forgive me if I have some of the ter...
asked by CuberChase
How to bind entities from Entity Framework to DataGrid?
My XAML:...<Window x:Class="Newsletter.UI.MessagesWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MessagesWindow" Name="messagesWindow" Height=...
asked by pmichna
Multiplicity constraint violated. The role xxx of the relationship xxx has multiplicity 1 or 0..1
Ive seen this question asked a few times but I'm afraid I am just not understanding the answers....In a nutshell, I have a Player that contains a property of type PlayerBaseballStat. Its a 1 to 1 relationship. PlayerBaseballStat has an ...ICollection<Ba...
asked by jason
WPF databinding to datagrid and entity framework database first
With Database First approach i've created the entities (with entity framework) inside my wpf project so i have the edmx file....From MSDN: EF generates code from your model using T4 templates. The templates shipped with Visual Studio or downloaded from ...
asked by Tom
Creating a list of entities that supports IBindingListView?
I use the following code in my data repository to return a list of entities. I want to bind to the list using a winforms bindingsource, and then to be able to support and filter the bindingsource...I currently use something like...mybindingSource.datasou...
asked by Kirsten Greed
Getter properties not found for `DbSet`s on my `Context`
I have a ...DbContext... used by a WPF client of a WCF service I 'host' in a Windows Service. Now, I don't know how this is related to what, in the WPF client, when I use the designer to place a ...SchedulerLogView... on my ...SchedulerView..., it shows a...
asked by ProfK
How to bind WinForms' DataGridView to EF navigation property (collection) in master-detail scenario?
I have a databinding problem in Windows Forms....Here's the part of the EF model that is relevant for the story:...namespace Model { class Person { [Key] public int Id { get; set; } public String Name { get; set; } ...
asked by Kornelije Petak
Binding data to a data-grid in WPF with Entity Framework
I've looked all over the web for this, and nothing I found seems to help. ...I made a model and added the model to a data source as an object. I assumed it would work like a data set where I can just drag and drop onto a form and it would bind the data fo...
asked by Gisiota
Why does a Bound Textbox not modify its associated property is the Text value is set programmatically?
I have a Windows Form with a number of Textboxes. I bind them to a DataSource as the Form Loads....public partial class FormSettings : Form { private readonly DbContext _context = new DbContext(); public FormSettings() { InitializeCom...
asked by Randy
How Can I Bind Data To DataGridView With EntityFramework In WPF
i have used Store Stored Procedure in my database (SQL Server)...select namebuffet,namefamilymember,idmember,Sum(finalpricefactorbuffet)-Sum((delivery*30)/100) as Price from Buffet_factorbuffet Inner join Buffet_buffet on idbuffet=buffetidfactor Inner ...
asked by Leonardo
What is the advantage of using INotifyPropertyChanged vs WinForms-like event handlers?
I am recoding a WinForms app (MySQL/EF6 with many fields to update) using WPF. I am examining code required to support INotifyPropertyChanged for each field, and wondering if this is an advantage over classic code behind event handling....I have develope...
asked by Charlie Peppler
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