Entity Framework 6 - Knowledge Base (KB)
19 results in tag: data-binding
How can I utilize LINQ to Entities with a WPF TreeView HierarchicalDataTemplate?
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
TreeView Binding in WPF
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
ASP.NET DropDownList Databinding 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 an empty item to the combobox associated with the 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
When the data in an entity model changes, does it trigger an event?
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
Using C# to connect Entity Framework objects to a Datagridview
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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