Questions tagged [data-annotations]

Data Annotations are used by frameworks such as ASP.NET MVC to enable a model-based validation approach and enforce consistent validation throughout the application, both on client and server side. They were first introduced in ASP.NET MVC 2. In addition to ASP.NET MVC, they can also be used with other technologies such as Entity Framework, either through manual placement of attributes on properties, or automatic generation with T4 templates.

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How do I specify the columns and rows of a multiline Editor-For in ASP.MVC?

In ASP.MVC 3, how do I specify the columns and rows for a multiline EditorFor (textarea)? I am using [UIHint("MultilineText")], but can't find any documentation on how to add attributes for the text area. Desired HTML:

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        <h3><a href="../../questions/2142990/the-id-field-is-required-validation-message-on-create-id-not-set-to-required" class="question-hyperlink">"The Id field is required" validation message on Create; Id not set to [Required]</a></h3>
        <div class="excerpt">This is happening when I try to create the entity using a Create style action in Asp.Net MVC 2.
The POCO has the following properties:
public int Id {get;set;}

[Required]
public string Message {get; set}

On the creation of the entity, the Id is…</div>
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    <time class="s-user-card--time" datetime="asked Jan 26 '10 at 22:01">asked Jan 26 '10 at 22:01</time>
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        <h3><a href="../../questions/13237193/data-annotation-to-validate-confirm-password" class="question-hyperlink">Data Annotation to validate confirm password</a></h3>
        <div class="excerpt">My User model has these data annotations to validate input fields:
[Required(ErrorMessage = "Username is required")]
[StringLength(16, ErrorMessage = "Must be between 3 and 16 characters", MinimumLength = 3)]
public string Username { get; set;…</div>
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        <h3><a href="../../questions/7027613/how-to-retrieve-data-annotations-from-code-programmatically" class="question-hyperlink">How to retrieve Data Annotations from code? (programmatically)</a></h3>
        <div class="excerpt">I'm using System.ComponentModel.DataAnnotations to provide validation for my Entity Framework 4.1 project.
For example:
public class Player
{
    [Required]
    [MaxLength(30)]
    [Display(Name = "Player Name")]
    public string PlayerName { get;…</div>
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    <time class="s-user-card--time" datetime="asked Aug 11 '11 at 14:25">asked Aug 11 '11 at 14:25</time>
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        <h3><a href="../../questions/8262590/entity-framework-code-first-fluent-api-adding-indexes-to-columns" class="question-hyperlink">Entity Framework Code First Fluent Api: Adding Indexes to columns</a></h3>
        <div class="excerpt">I'm running EF 4.2 CF and want to create indexes on certain columns in my POCO objects.
As an example lets say we have this employee class:
public class Employee
{
  public int EmployeeID { get; set; }
  public string EmployeeCode { get; set; }
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        <h3><a href="../../questions/2493800/how-can-i-tell-the-data-annotations-validator-to-also-validate-complex-child-p" class="question-hyperlink">How can I tell the Data Annotations validator to also validate complex child properties?</a></h3>
        <div class="excerpt">Can I automatically validate complex child objects when validating a parent object and include the results in the populated ICollection<ValidationResult>?
If I run the following code:
using System;
using System.Collections.Generic;
using…</div>
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        <h3><a href="../../questions/3413715/how-to-create-custom-data-annotation-validators" class="question-hyperlink">How to create Custom Data Annotation Validators</a></h3>
        <div class="excerpt">Wanting to create custom data annotation validation. Are there any useful guides / samples on how to create them?
Firstly:
StringLength with minimum and maximum length. I'm aware .NET 4 can do this, but want to do the same in .NET 3.5, if possible…</div>
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        <h3><a href="../../questions/30798906/the-specified-value-does-not-conform-to-the-required-format-yyyy-mm-dd" class="question-hyperlink">The specified value does not conform to the required format yyyy-MM-dd</a></h3>
        <div class="excerpt">I have a .Net MVC 5 application that is using Data Annotations, Entity-Framework Jquery 2.1.3 and Jquery UI 1.11.4. 
When I render an edit form with an input of type date using the UK format "dd/MM/YYYY"; the following error message appears when…</div>
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        <h3><a href="../../questions/23071795/how-to-add-required-attribute-to-mvc-razor-viewmodel-text-input-editor" class="question-hyperlink">How to add "required" attribute to mvc razor viewmodel text input editor</a></h3>
        <div class="excerpt">I have the following MVC 5 Razor HTML helper:
@Html.TextBoxFor(m => m.ShortName, 
  new { @class = "form-control", @placeholder = "short name"})

I need this field to be required (i.e. have a red outline when user navigates out without putting a…</div>
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        <h3><a href="../../questions/1406046/data-annotation-ranges-of-dates" class="question-hyperlink">Data Annotation Ranges of Dates</a></h3>
        <div class="excerpt">Is it possible to use [Range] annotation for dates?
something like   
[Range(typeof(DateTime), DateTime.MinValue.ToString(), DateTime.Today.ToString())]

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        <h3><a href="../../questions/4895465/how-do-i-specify-that-a-property-should-generate-a-text-column-rather-than-an-" class="question-hyperlink">How do I specify that a property should generate a TEXT column rather than an nvarchar(4000)</a></h3>
        <div class="excerpt">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.
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public class Article
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        <h3><a href="../../questions/2245185/how-to-handle-booleans-checkboxes-in-asp-net-mvc-2-with-dataannotations" class="question-hyperlink">How to handle Booleans/CheckBoxes in ASP.NET MVC 2 with DataAnnotations?</a></h3>
        <div class="excerpt">I've got a view model like this:
public class SignUpViewModel
{
    [Required(ErrorMessage = "Bitte lesen und akzeptieren Sie die AGB.")]
    [DisplayName("Ich habe die AGB gelesen und akzeptiere diese.")]
    public bool AgreesWithTerms { get; set;…</div>
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        <h3><a href="../../questions/8244572/dataannotations-validation-regular-expression-in-asp-net-mvc-4-razor-view" class="question-hyperlink">DataAnnotations validation (Regular Expression) in asp.net mvc 4 - razor view</a></h3>
        <div class="excerpt">The DataAnnotations validator not working in asp.net mvc 4 razor view, when using the special characters in the regular expression.
Model:
[StringLength(100)]
[Display(Description = "First Name")]
[RegularExpression("^([a-zA-Z0-9 .&'-]+)$",…</div>
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        <h3><a href="../../questions/4938078/using-dataannotations-to-compare-two-model-properties" class="question-hyperlink">Using DataAnnotations to compare two model properties</a></h3>
        <div class="excerpt">How would I go about writing a custom ValidationAttribute that compares two fields? This is the common "enter password", "confirm password" scenario. I need to be sure the two fields are equal and to keep things consistent, I want to implement the…</div>
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        <h3><a href="../../questions/2001756/asp-net-mvc-displayformat" class="question-hyperlink">ASP.Net MVC DisplayFormat</a></h3>
        <div class="excerpt">In my model I have the following DataAnnotations on one of my properties
[Required(ErrorMessage = "*")]
[DisplayFormat(DataFormatString = "{0:d}")]
[DataType(DataType.Date)]
public DateTime Birthdate { get; set; }

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