Entity Framework 6 - Knowledge Base (KB)
29 results in tag: data-annotations
Validate data using DataAnnotations with WPF & Entity Framework?
Is there any way to validate using DataAnnotations in WPF & Entity Framework?
asked by Shimmy
Custom validation with Data annotations
I'm using data annotations to check data that's being entered, but I'm stuck when it comes to more custom way to validate data....I need to run queries against database to see if stuff exists there or not, and then report back to user if a "custom db-chec...
asked by Lasse Edsvik
Server-side validation of a REQUIRED String Property in MVC2 Entity Framework 4 does not work
I'm trying to get server-side validation of an Entity Framework String Property to work. Other server-side validation such as data type validation and required dateTime and numeric EF properties are working. ...This in VS 2010, .Net 4.0, MVC2 + Cloud, ADO...
asked by HackITMngr
Data Annotations [Required] attribute on property of split Entity Data Model
I'm using the ...Table Splitting... feature of the Entity Framework to split my Entity Data Model as follows:...+--------+ +--------------+ | News | | NewsImages | +--------+ +--------------+ | NewsID | | NewsID | | Text | | Ima...
asked by Marius Schulz
How do I specify that a property should generate a TEXT column rather than an nvarchar(4000)
I'm working with the Code First feature of Entity Framework and I'm trying to figure out how I can specify the column data types that should be created when the database is auto-generated....I have a simple model:...public class Article { public int A...
asked by Mark Bell
Entity Framework - Default value for property using Data Annotations
I have a model like this...public class MyModel { public int MyModelId { get; set; } public string Name { get; set; } public string Description { get; set; } public string Title { get; set; } } ...I was wondering if there's a way, using Da...
asked by noinstance
In MVC 3, I can't get @Html.DisplayFor to render a formatted string
I'm hoping this is quite a simple one, although after lots of Googling, I've not been able to work it out....I'm working on a shopping cart site with MVC 3, and using code-first Entity Framework. The model I'm sending over is a list of Product objects, an...
asked by Matt Winward
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
How to prevent from DataAnnotations Attributes being deleted in DataBase First Model
I have my asp.net mvc 3 application with entity framework and i used the Database First model to set it up....My Steps below: 1. Genarated a database with tables 2. Created ADO.NET Entity Data Model file (.edmx) and imported the tables 3. inside the de...
asked by python
How to hide Entity Framework entity properties from strongly typed views?
I am using Entity Framework in my ASP.NET MVC 4.0 application and I want to know how to prevent or hide fields from my entity from being generated in my strongly typed view? Right now several primary key fields and timestamp fields are being generated on ...
asked by atconway
How to make entry field to allow numbers only using EF and Data Annotations?
I am trying to figure out if there is a way to make sure that numeric only input is allowed using Data Annotations and Entity Framework....I am using the following code...[Required] [DisplayName("Client No")] [Column("client_no", TypeName = "smallint")] p...
asked by Naomi
Data annotations - DisplayFormat - formatting string of numbers
I have the following string: ..."10222002750400447092095835"...I want it to be displayed like this: ...10 2220 0275 0400 4470 9209 5835...I tried doing the following, with no result at all:...[DisplayFormat(DataFormatString = "{0:00 0000 0000 0000 0000 00...
asked by ojek
Entity Framework Code First : how to annotate a foreign key for a "Default" value?
I have 2 classes: Client and Survey....Each Client can have many surveys - but only one default survey....I have defined the classes like this:...public class Client { [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int ID { get; set;...
asked by Colin
Unique Index using Data Annotations
Is there a way to define a Unique Index using Data Annotations?...lets say I have a class:...public class User { [Key] public int UserID { get; set; } public string UserName { get; set; } public string Email { get; set; } } ...If I want Email...
asked by clifford.duke
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
Entity framework data annotation of foreign key without a navigation property
I have the following table definition:...public partial class ClientClassification { [Key, Column(Order = 0)] public long ClientId { get; set; } [Key, Column(Order = 1)] public ClientClassificationEnum ClientClassificationType { get; set;...
asked by TheEdge
Create Foreign Key using Data Annotations
In the code below, I need to set a foreign key constrant on ParentInfoAddProperties.ParentQuestionAnswersId so that it is dependent on ParentQuestionAnswers.Id (which is a Primary Key). I am attempting to do so using data annotations but Entity Framework...
asked by gemini6609
Entity Framework Code First Foreign Key issue
It seems to me like the ...ForeignKey... attribute is not working for me, but I guess I'm using it wrong ;)...It's easier to explain with code:...public class BaseCard { public int Id {get ; set; } public int BaseCardId { get; set; } public L...
asked by Rob
Creating 2 sides relationship between a model to the default ApplicationUser of a basic MVC 5 project. Working with 2 dbContext classes
I believe it's suppose to be a trivial issue, but I didn't find any relevant answer....I am working on a MVC 5 project (created by the default VS template with Identity)....I have a Post model. Only an Authorized "user" ("user" is the default Application...
asked by Dudi
Table name in data annotations in entity framework doesn't work.
I create a project in MVC 5 with entity framework 6. I am using code first approach. I want in one of the models define a different name for the table then the default. For that I use the System.ComponentModel.DataAnnotationsname space and define the clas...
asked by miguelbgouveia
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