Entity Framework 6 - Knowledge Base (KB)
15 results in tag: validation
Entity Framework Validation
I'm getting ready to start a new project and I've been researching the entity framework. My question is what is the best strategy for validating the entities? Other projects I've worked on have used attributes for most of the validation, but obviously thi...
asked by Micah
Best practice entity validation in ASP.NET MVC & ADO.NET Entity Framework
i am using ASP.NET MVC & ADO.NET Entity Framework in a project. I want to add validation logic to my entities via partial classes. It works similar like shown in the ...NerdDinner.com ASP.NET MVC Application... which is using LINQ2SQL. The main difference...
asked by Alexander
Validate data using DataAnnotations with WPF & Entity Framework?
Is there any way to validate using DataAnnotations in WPF & Entity Framework?
asked by Shimmy
Using DataAnnotations with Entity Framework
I have used the Entity Framework with VS2010 to create a simple person class with properties, firstName, lastName, and email. If I want to attach DataAnnotations like as is done in this ...blog post... I have a small problem because my person class is dy...
asked by dcompiled
Handling required fields in ASP.NET MVC when using Entity Framework
Let me start out by describing my app in a step by step format....First I have my Entity Framework generated model. Within it I have the following entities:...http://www.codetunnel.com/EFEntities.jpg...Now, to implement validation on an entity, I use part...
asked by Chev
MVC Entity Framework validation to prevent duplicate records
Hi i'm new to MVC and EF so this may be a really simple question but what is the best way to prevent the user from trying to enter duplicate records?...I have a simple look up table with one column which is the primary key. I'm creating a maintenance scre...
asked by Jammy
using Metadata with Entity Framework to validate using Data Annotation
I have a entity called Product,this is a part of it's declration:...[EdmEntityTypeAttribute(NamespaceName="NorthwindModel", Name="Product")] [Serializable()] [DataContractAttribute(IsReference=true)] public partial class Product : EntityObject { #regi...
asked by Arian
@Html.ValidationMessageFor did not work as expected
I have a two model classes which have relationship of one to many....public class CycleType { [Required(ErrorMessage = "Cycle is required.")] public int CycleTypeID { get; set; } [Required(ErrorMessage = "Cycle Type is required.")] [Strin...
asked by Frank Myat Thu
Entity Framework validation with partial updates
I'm using Entity Framework 5.0 with DbContext and POCO entities. There's a simple entity containing 3 properties:...public class Record { public int Id { get; set; } public string Title { get; set; } public bool IsActive { get; set; } } ...The...
asked by Skog
Allow empty strings for fields marked with PhoneAttribute or UrlAttribute
I'm using CodeFirst Entitty framework 5. I have a class representing a user....public class User { [Key] public int UserId { get; set; } [Url] [DataType(DataType.Url)] [Required(AllowEmptyStrings= true)] public string WebSite { ge...
asked by Nu-hin
Solution for "Validation failed for one or more entities. See 'EntityValidationErrors' property for more details."
I encountered this error, it did not provide any detail as to what the root cause was but I figured out what the problem is. I wanted to share it so that others that encounter it might have success in solving the problem....I had the following class:... ...
asked by FrankO
C# Entity Framework: Data validation between add to context and saveChanges()
I have a simple scenario using the Entity Framework in C#. I have an Entity Post: ...public class Post { public int Id { get; set; } public string Name { get; set; } public string Description { get; set; } } ...In my PostManager I have these m...
asked by Andrea Moraglia
Entity Framework GetValidationErrors empty for unique index
I want to check for validation errors before I save the context. I call context.GetValidationErrors(), which is empty, then I call context.SaveChanges() and I get the error for a duplicate row for my unique index....using(var context = new DefaultDbContex...
asked by Tony
how to change type validation error messages?
I'm using entity framework code first in an ASP MVC project, and I'd like to change the error message that appears for validation of a numeric type....I have a property like...public decimal Amount1 { get; set; } ...If I enter a non-number in the field, I...
asked by Mike
Query database and unsaved changes for validation with Entity Framework 6
I have a data layer using Entity Framework 6 ...Database First.... One of my entities represents a time span - it has a start date and an end date....public class Range { public Guid ID { get; set; } public DateTime StartDate { get; set; } pub...
asked by xr280xr
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