Does use of foreign key in EDM of MVC slowers execution?
Nope, Basically what is EDM or Lets take an example of Linq to Sql, It is just a converter of your Object Queries to SQL, and then it fires the same as the Inline query , using a SqlConnection object. This Question is two - fold : Is the Database...
Migrating from WCF Data Services to WebApiOdata
entity-framework,odata,wcf-data-services,edmx,asp.net-web-api-odata
RESTier is a layer of abstraction over Web API OData that should feel similar in ways to WCF Data Services, but still allow the flexibility of Web API OData. It already has an EF provider so ideally you should be up and running within minutes with a very small amount...
The complex type 'MyData.AssetReading' refers to the entity type 'MyData.Asset' through the property 'Asset'
entity-framework,asp.net-web-api,odata,edmx,asp.net-web-api-odata
This error message is caused by the fact that the current version of Web API for OData V4 doesn't support defining navigation properties on a complex type in the model. I.e. complex type can't refer to entity type(s) yet. This work is tracked by this GitHub issue: https://github.com/OData/WebApi/issues/65. Weigh in...
why does ListBox populate individual characters from (.edmx) model on new line
c#,asp.net-mvc,visual-studio-2013,entity-framework-5,edmx
it's because GameTitle property is type of string(a sequence of characters). so, try like this: ViewBag.items = listSelectItems; return View(dbdata); in your View: @Html.ListBox(Model.GameTitle,(IEnumerable<SelectListItems>)ViewBag.items) you don't need: dbdata.GameTitle = selectList.Text; dbdata.Value = selectList.Value; Or you can put a property of type List<SelectListItem> in your dbdata model, then assign listSelectItems to...
Using WebApi + Odata on an Edmx
entity-framework,asp.net-web-api,odata,edmx,asp.net-web-api-odata
You may try using RESTier -- a .Net framework built upon Web API OData. There are several things you may need to pay attention: RESTier has an EF provider which is quite similar with WCF data services. So it should work wiht the edmx model with little tweak. RESTier is...
Entity Framework 1to1 relationship via association table not working in EDMX
c#,sql-server,entity-framework,entity-framework-6,edmx
It is a "bug" with the entire EF design: Entity Framework 4-6.1x Only Honors Multiplicity on Primary Keys. Thus even though we know (and the RA models) that it is a 1-1 relationship due to a Candidate Key Constraint, EF does not and will not like it. Tough luck. The...
How can I reference two databases using Entity Framework database first?
c#,asp.net-mvc,entity-framework,edmx,database-first
try to use fully qualified namespace and see what happens. if you hate too long namespace assign an alias for namespace
The difference between EF6 and EF4.1 in files hierarchy
c#,entity-framework,visual-studio-2012,entity-framework-6,edmx
So lets make it clear step by step: You've got your .edmx file, which was created from designer or generated from existing database. But it's only an xml file, which contains info about the database structure that is used - storage scheme, info about entities - conceptual schema and mappings...
Why is my Partial View is not Showing anything in ASP.NET MVC4 with EDMX model
c#,asp.net-mvc,entity-framework,asp.net-mvc-4,edmx
You are not loading anything from the database. You create an new instance of the view model, and only assign empty lists, which means the view model is empty, and there's nothing to show in the views. You wouldn't get an error in that case. It should be something like....
The number of primary key values passed must match number of primary key values defined on the entity
.net,sql-server,asp.net-mvc,entity-framework,edmx
If you set your Primary Key in .edmx you should update your database too, because you have PK in your model and not in your database.
The namE attribute is not supported in this context
.net,vb.net,edmx,name-attribute
Solved I am using EntityFramework 6.0 version instead of 5.0. I fixed it by downloading the dll of EntityFramework 5.0 and remove reference of EntityFramework 6.0 in my Project and give it again reference of EntityFramework 5.0 dll and finally clean and rebuild the project which solved my problem....
Visual Studio 2013 error creating an EDMX file
c#,entity-framework,visual-studio-2013,edmx,edmx-designer
Based on the error "XmlModels involved in this transaction are not editable", I was able to track down a response to a similar issue: Entity Framework Unable to refresh database tables under TFS 2010 In short, my project and solution were stored on disk at C:\Code\C#\Application\[etcetera] The issue was the...
Cannot convert type 'System.Collections.Generic.List' to 'System.Collections.Generic.List'
c#,asp.net-mvc,asp.net-mvc-4,generics,edmx
You have to convert the library.Class1 to website.Class1. Even if they have same name the classes are different because they are in separate libraries. List<website.Class1> a = objLibraryRef.GetFileLists1() .Select(c => new website.Class1 { property1 = c.property1, ... propertyN = c.propertyN }).ToList(); Note: Replace property1..N with your properties (i.e. Name). For...
How does Entity framework implement deleting parent and a child record on the ame SaveChanges()
entity-framework,entity-framework-5,entity-framework-6,edmx,dbset
You tried to delete a Dept which has a collection of Emp assigned to it. The following exception occurred The DELETE statement conflicted with the REFERENCE constraint That means that there's a constraint to the Dept - Emp relationship. My guess is that it's an one - to many relationship,...
Entity Framework files are not nested under the EDMX file
c#,asp.net-mvc,entity-framework,t4,edmx
Edit you .csproj and make sure you have "DependentUpon>Model.edmx</DependentUpon>" under <Content Include="Model.tt">. if you don't find it, add DependentUpon tag and save your .csproj file. <Content Include="Model.tt"> <Generator>TextTemplatingFileGenerator</Generator> <DependentUpon>Model.edmx</DependentUpon> <LastGenOutput>Model.cs</LastGenOutput> </Content> ...
How to add an EF6 Association to a Candidate Key / Unique Key which is not the Primary Key?
entity-framework,entity-framework-6,foreign-key-relationship,edmx,unique-key
Looks like "missing important feature" .. The Entity Framework currently only supports basing referential constraints on primary keys and does not have a notion of a unique constraint. You can remove foreign key in DB scheme and use LINQ to join tables: from item in ExternalDataItems join map in ExternalMaps...