srch

Aug 3, 2012 · Entity Framework insert doesn't work. I have a very simple windows form project with Entity Framework. Simply I draged my tables from "Data Source" tab in my "form" and it generate for me a "DataGridView" and a "BindingSource". Data bound successfully and when I run project I can see "DataGridView" filled with data correctly and I can update any cells value from "DataGridView".

VerkkoThe solution that worked for me after trying a whole raft of other solutions posted, was to: right click on my project select Manage Nuget Packages select the browse tab thick …

What do you mean by "it doesn't work"? New record does not appear in database? Of course it won't. In this line. teachers_tableBindingSource.DataSource = context.teachers_table.ToList(); you're breaking DataSource's connection to context. Any new item inserted into it will be inserted not into teachers_table, but into List you created over it.

Solving the "Store update, insert, or delete statement affected an unexpected number of rows (0)" response.

Queries not including related data. EF Core moved away from lazy loading as a default feature. Navigation properties still exist as part of the ...

This model is built using a set of conventions - heuristics that look for common patterns. The model can then be customized using mapping attributes (also …

Install the tools. First, you'll have to install the EF Core command-line tools: We generally recommend using the .NET Core CLI tools, which work on all …

Nov 12, 2016 · I have a Entity Framework API Controller that was generated, I am now trying to add a new method to it: [ResponseType (typeof (LCPreview))] public IHttpActionResult ValidateEmail (string email) { LCPreview lCPreview = db.Data.Find (5); if (lCPreview == null) { return NotFound (); } return Ok (lCPreview); } The request is invalid.

I have a Entity Framework API Controller that was generated, I am now trying to add a new method to it: [ResponseType (typeof (LCPreview))] public …

Now Entity Framework has fetched SampleEntitys and NavProp1 entities from the database separately, but it glues them together by a process called …

I learned some basic stuff on EF 4.0 and recently upgraded to EF 6.0. I can't seem to get a simple insert working. Has the "ent.AddtoImage()" ...

I can add a new ADO.NET Entity Data Model, select tables, use LINQ to query, etc. and everything works fine. As soon as I want to add some tables or so ...

VerkkoNow Entity Framework has fetched SampleEntitys and NavProp1 entities from the database separately, but it glues them together by a process called relationship fixup. …

Hello , I observed that when I wand to add a new Model created from database is not working. Can you see in the attached .gif that Add New Item is in an …

Aug 4, 2022 · Hello , I observed that when I wand to add a new Model created from database is not working. Can you see in the attached .gif that Add New Item is in an infinite loop.

Jan 12, 2023 · When a data model change is introduced, the developer uses EF Core tools to add a corresponding migration describing the updates necessary to keep the database schema in sync. EF Core compares the current model against a snapshot of the old model to determine the differences, and generates migration source files; the files can be tracked in your project's source control like any other source file.

Hello ,. I observed that when I wand to add a new Model created from database is not working. Can you see in the attached .gif that Add New Item ...

VerkkoUsing metadata class to override EF field names in MVC view model not working Create a partial class in the MetaData class that looks something like …

Jul 21, 2022 · Entity Framework (EF) is an object-relational mapper that enables .NET developers to work with relational data using domain-specific objects. It eliminates the need for most of the data-access code that developers usually need to write. Get it: Add this to your project and start taking advantage of this powerful O/RM.

The key methods for adding entities via the DbContext are. Add<TEntity>(TEntity entity); Add(object entity); AddRange(IEnumerable<object> entities) ...

Learn how to add, udpate or delete data in the connected scenario using Entity Framework 6.x.

Mar 14, 2014 · 1 Assuming that Image is an entity generated by EF you can use ent.Images.Add (insertImg); in EF6, then the rest of your code. Share Improve this answer Follow answered Mar 14, 2014 at 7:11 Roland Kovacs 26 2 Add a comment 1 Yeah. beacause evEntities is valid only in the scope of the using statement, which is the next block.

Issues we've faced using Entity Framework · Slow processing of SELECT statements · Poor data materialization · Slow INSERT/UPDATE query processing ...

VerkkoEntity Framework appears to nullify navigation properties in memory as soon as an entity is marked as EntityState.Deleted. So to access existingUserTopic.Topic in my …