Category "entity-framework"

HTTP Patch Delta is Null with oData web service

I am using entity framework code first. My entities and controller were generated by Visual Studio and have not been modified. This issue seems to be that the

How can I avoid TimeOut exception using Entity Framework with a stored procedure?

I'm using Entity Framework to call a stored procedure which takes 2 minutes to execute. As a result, I get a timeout exception. Is there any way I can use my

.NET Core 6/EF Core 6.referencing Microsoft.Data.SqlClient, Version=2.0.20168.4

We've created a Web API using .NET Core 6 and EF Core 6. In development environment all works good but when I do the publish application fails with an error Sy

Multiple using of || and && operands

I have a query using Entity Framework. It has many different operands and I am confused with its priority. I am getting the wrong result. I need all records tha

In my flutter app when i open gps or camera or map , or any url , getting error "Lost connection to device." everytime

I am testing on a real device(Redmi 7A) when I open Camera ,URL,GPS, app always get error "Lost connection to device." but when i test on Samsung m31 or Samsung

A fatal error occurred. The required library libhostfxr.dylib could not be found

I'm working on ASP.NET Project with .NET 5.0. For Database creation, I've run the command dotnet tool install --global dotnet-ef After the installing, when I

Dynamic Search Using Entity Framework

I have a search screen with optional fields using Entity Framework, I want to build a dynamic query without selecting the object and filter on it. I want to Op

Entity Framework Core: load related data after object is queried

It is clear how to query an entity and include all the related data; e.g.: using (var context = new BloggingContext()) { var blogs = context.Blogs .

What is the best way to perform partial updates in EF core and never update certain properties?

I know you can do something like var myObj = _db.MyTable.FirstOrDefault(x=>x.Id==id) and then update myObj property by property that you want to update but i

The instance of entity type cannot be tracked because another instance of this type with the same key is already being tracked

I have a Service Object Update public bool Update(object original, object modified) { var originalClient = (Client)original; var modifiedClient = (Cli

SQL Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding

I am using Microsoft.EntityFrameworkCore.SqlServer 2.2.6. I have a stored procedure which typically takes 1 to 2 seconds to execute. I am using .NET Core 2.2 wi

'Nullable object must have a value.' for List in LINQ c#

In database I have next model tblWorkItem with next field: public List<xWorkItemItemFailReason> WorkItemItemFailReasons { get; set; } When I am trying

Adding a New Column to an Existing Table in Entity Framework

I have added a new column to a table in my database. The table is already defined in the existing Entity Framework model. I've been through most of the items he

Cast IQueryable<DomainModel> to IQueryable<EntityModel> for EntityFramework

I'm trying to convert an IQueryable to IQueryable to allow me to take advantage of the dynamic filtering offered by Linq in the EntityFramework context. I'm try

Why doesn't scaffolding work as expected?

I am trying to scaffold and I get the following error: There was an error running the selected code generator: 'No parameterless constructor defined for typ

How to get all DbSet from DbContext

I need to get all tables in the database using EF. I need them to go table by table and extract certain information from each. Any idea how?

Entity Migration. Could not drop constraint. See previous errors

Here is the code that produce this error. I've tried solution for renaming the AddForeignKey but the error is same. 'PK_dbo.Item' is not a constraint. Co

How to Bulk Update records in Entity Framework?

I am trying to bulk update records using Entity Framework. I have tried Entity Framework.Extensions Update method. The Update method is able to bulk update for

scaffold-DbContext , command results in exception: System.Reflection.TargetInvocationException

When attempted to run a scaffold command I am now receieving the exception noted below. It may be important to note that this stopped working all of a sudden. C

Entity type ‘Business_attrib2object’ has composite primary key defined with data annotations. To set composite primary key, use fluent API

I set composite primary key using fluent API, it is still an error, when I'm trying to create ClassesController (MVC Controller with Views Using Entity Framewor

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