entityset

Generic List to EntitySet Conversion

由 送分小仙女□ 提交于 2019-12-23 06:57:28
问题 How do I Convert a System.Collections.Generic.List<T> to a System.Data.Linq.EntitySet<T> ? 回答1: Don't think you can convert a List<T> to an EntitySet<T> but you can put the content of your list in the entitySet. var list = new List<string> { "a", "b", "c" }; var entitySet = new EntitySet<string>(); entitySet.AddRange(list); Here's a extension method for that: public static EntitySet<T> ToEntitySet<T>(this IEnumerable<T> source) where T : class { var es = new EntitySet<T>(); es.AddRange(source

Where is EntitySet<T>'s “Results View”?

由 纵饮孤独 提交于 2019-12-23 03:26:19
问题 When looking at a linked EntitySet<T> of a LINQ to SQL mapped entity, I see the following: I'd like to see the following (achieved by using the .AsQueryable() extension method) so that I can click the little refresh icon and see the content: Why can't I see the Results View on a regular plain EntitySet<T> ? Also, I've noticed that on this MSDN page it says: In LINQ to SQL, the EntitySet<TEntity> class implements the IQueryable interface. From what I can see, EntitySet<TEntity> doesn't inherit

WPF binding not notifying of changes

由 ▼魔方 西西 提交于 2019-12-11 04:23:22
问题 I have a WPF sorting/binding issue. (Disclaimer: I am very new to WPF and databinding so apologise if I am asking a really dumb question :-)) Firstly, I have a linqToSql entity class Contact with an EntitySet<Booking> property Bookings on it. If I directly bind this Bookings property to a ListView , the application seems to correctly notify of changes to the selected item in the ListView , such that a textbox with {Binding Path=Bookings/Comments} updates correctly. // This code works, but

ASP.NET MVC Model Binding Related Entities on Same Page

由 。_饼干妹妹 提交于 2019-12-10 04:59:34
问题 This problem has been driving me crazy for several hours now... In my domain, I have 2 entities that are related to each other Sku and Item . Each sku can have many items. public class Sku { private readonly EntitySet<Item> items; public Sku() { items = new EntitySet<Item>(AttachItems, DetachItems); } public int SkuId { get; set; } public string LongDescription { get; set; } public EntitySet<Item> Items { get { return items; } set{ items.Assign(value);} } private void AttachItems(Item entity)

LINQ-to-SQL + One-to-Many + DataBinding deleting

由 余生长醉 提交于 2019-12-06 21:38:32
问题 I use LINQ-to-SQL to load data from a database that has two tables in a one-to-many relationship (one Recipe has many Ingredients). I load a Recipe and LINQ retrieves Ingredient objects into an EntitySet that is binded into a ListBox. If I want to delete some Ingredients off a Recipe, I get a "An attempt was made to remove a relationship between a Recipe and a Ingredient. However, one of the relationship's foreign keys (Ingredient.RecipeID) cannot be set to null. I SOLVED this problem using

ASP.NET MVC Model Binding Related Entities on Same Page

由 蓝咒 提交于 2019-12-05 10:13:25
This problem has been driving me crazy for several hours now... In my domain, I have 2 entities that are related to each other Sku and Item . Each sku can have many items. public class Sku { private readonly EntitySet<Item> items; public Sku() { items = new EntitySet<Item>(AttachItems, DetachItems); } public int SkuId { get; set; } public string LongDescription { get; set; } public EntitySet<Item> Items { get { return items; } set{ items.Assign(value);} } private void AttachItems(Item entity) { entity.Sku = this; } private static void DetachItems(Item entity) { entity.Sku = null; } } public

How do you sort an EntitySet<T>

由 拟墨画扇 提交于 2019-12-02 08:26:31
问题 The MSDN documentation states that an EntitySet implements IBindingList (see 'Binding to EntitySets' at http://msdn.microsoft.com/en-us/library/bb546190.aspx) However, it can be clearly seen that an EntitySet does not implement this interface! So how do I sort? For context, I'm binding this set to a WPF ListView. For wider context of problem I'm trying to solve please see this post. 回答1: EntitySet<T> doesn't implement IBindingList...it provides a method to get an IBindingList. You need to

How do you sort an EntitySet<T>

由 淺唱寂寞╮ 提交于 2019-12-02 04:51:43
The MSDN documentation states that an EntitySet implements IBindingList (see 'Binding to EntitySets' at http://msdn.microsoft.com/en-us/library/bb546190.aspx ) However, it can be clearly seen that an EntitySet does not implement this interface! So how do I sort? For context, I'm binding this set to a WPF ListView. For wider context of problem I'm trying to solve please see this post . EntitySet<T> doesn't implement IBindingList...it provides a method to get an IBindingList. You need to call .GetNewBindingList() to get an instance of EntitySetBindingList<T>, which derives from

RIA Services EntitySet does not support 'Edit' operation

由 ◇◆丶佛笑我妖孽 提交于 2019-11-30 17:11:44
Making my first steps in RIA Services (VS2010Beta2) and i encountered this problem: created an EF Model (no POCOs), generic repository on top of it and a RIA Service(hosted in an ASP.NET MVC application) and tried to get data from within the ASP.NET MVC application: worked well. Next step: Silverlight client. Got a reference to the RIAService (through its context), queried for all the records of the repository and got them into the SL application as well (using this code sample): private ObservableCollection<Culture> _cultures = new ObservableCollection<Culture>(); public ObservableCollection

RIA Services EntitySet does not support 'Edit' operation

由 最后都变了- 提交于 2019-11-30 00:37:40
问题 Making my first steps in RIA Services (VS2010Beta2) and i encountered this problem: created an EF Model (no POCOs), generic repository on top of it and a RIA Service(hosted in an ASP.NET MVC application) and tried to get data from within the ASP.NET MVC application: worked well. Next step: Silverlight client. Got a reference to the RIAService (through its context), queried for all the records of the repository and got them into the SL application as well (using this code sample): private
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