Heidel Heidel - 15 days ago 5
C# Question

String MinLength and MaxLength validation don't work (asp.net mvc)

I have this class

using System.ComponentModel.DataAnnotations;
using Argussoft.BI.DAL.Domain.Users;

namespace Argussoft.BI.DAL.DTOs.UserDTOs
{
public class CreateUserDto
{
[Required(ErrorMessage = "Введите логин")]
[MaxLength(User.EmailLength, ErrorMessage = "Максимальная длина логина 40 символов")]
[RegularExpression(User.NameRegularExpression, ErrorMessage = "Логин может содержать только латинские символы, дефисы, подчеркивания, точки")]
public string Name { get; set; }

[Required(ErrorMessage = "Введите Email")]
[MaxLength(User.EmailLength, ErrorMessage = "Максимальная длина адреса электронной почты 100 символов")]
[RegularExpression(User.EmailRegularExpression, ErrorMessage = "Введите корректный адрес электронной почты")]
public virtual string Email { get; set; }

[Required(ErrorMessage = "Введите имя пользователя")]
[MaxLength(User.FullNameLength, ErrorMessage = "Максимальная длина имени пользователя 100 символов")]
[RegularExpression(User.NameRegularExpression, ErrorMessage = "Имя пользователя может содержать только латинские символы, дефисы, подчеркивания, точки")]
public virtual string FullName { get; set; }

public virtual int Role { get; set; }

[RegularExpression(User.PhoneRegularExpression, ErrorMessage = "Введите корректный номер телефона")]
public virtual string Phone { get; set; }

public virtual int Status { get; set; }

[Required(ErrorMessage = "Введите пароль")]
[MinLength(User.PasswordMinLength, ErrorMessage = "Минимальная длина пароля 5 символов")]
[MaxLength(User.PasswordMaxLength, ErrorMessage = "Максимальная длина пароля 20 символов")]
[RegularExpression(User.PasswordRegularExpression, ErrorMessage = "Пароль может содержать только латинские символы, дефисы, подчеркивания, точки")]
public virtual string Password { get; set; }
}
}


and this form

@model Argussoft.BI.DAL.DTOs.UserDTOs.CreateUserDto

@using (Ajax.BeginForm("CreateUser", "User", new AjaxOptions { OnSuccess = "onSuccessCreateUser" }, new { id = "dialog_form", @class = "form-horizontal" }))
{
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
<h4>Добавить пользователя</h4>
</div>
<div class="modal-body">

<!-- Name -->
<div class="control-group">
<label class="control-label" for="@Html.NameFor(model => model.Name)">Логин</label>
<div class="controls">
<div class="input-prepend">
@Html.TextBoxFor(model => model.Name, new { @class = "span3", id = "input_name" })
<br />
@Html.ValidationMessageFor(model => model.Name)
</div>
</div>
</div>

<!-- Email -->
<div class="control-group">
<label class="control-label" for="@Html.NameFor(model => model.Email)">Email</label>
<div class="controls">
<div class="input-prepend">
@Html.TextBoxFor(model => model.Email, new { @class = "span3", id = "input_email" })
<br />
@Html.ValidationMessageFor(model => model.Email)
</div>
</div>
</div>

<!-- FullName -->
<div class="control-group">
<label class="control-label" for="@Html.NameFor(model => model.FullName)">Имя пользователя</label>
<div class="controls">
<div class="input-prepend">
@Html.TextBoxFor(model => model.FullName, new { @class = "span3", id = "input_full_name" })
<br />
@Html.ValidationMessageFor(model => model.FullName)
</div>
</div>
</div>

<!-- Role -->
<div class="control-group">
<label class="control-label" for="@Html.NameFor(model => model.Role)">Роль пользователя</label>
<div class="controls">
<div class="input-prepend">
@Html.DropDownList("Role", (SelectList)ViewBag.Roles,new{id ="input_role"})
<br />
@Html.ValidationMessageFor(model => model.Role)
</div>
</div>
</div>

<!-- Phone -->
<div class="control-group">
<label class="control-label" for="@Html.NameFor(model => model.Phone)">Контактный телефон</label>
<div class="controls">
<div class="input-prepend">
@Html.TextBoxFor(model => model.Phone, new { @class = "span3", id = "input_phone" })
<br />
@Html.ValidationMessageFor(model => model.Phone)
</div>
</div>
</div>

<!-- Status -->
<div class="control-group">
<label class="control-label" for="@Html.NameFor(model => model.Status)">Статус пользователя</label>
<div class="controls">
<div class="input-prepend">
@Html.DropDownList("Status", (SelectList)ViewBag.UserStatuses,new{id ="input_status"})
<br />
@Html.ValidationMessageFor(model => model.Status)
</div>
</div>
</div>

<!-- Password -->
<div class="control-group">
<label class="control-label" for="@Html.NameFor(model => model.Password)">Пароль пользователя</label>
<div class="controls">
<div class="input-prepend">
@Html.TextBoxFor(model => model.Password, new { @class = "span3", id = "input_password" })
<br />
@Html.ValidationMessageFor(model => model.Password)
</div>
</div>
</div>

</div>
<div class="modal-footer">
<a href="@Url.Action("UserIndex", "User")" class="btn">Отменить</a>
<button type="submit" id="save_button" class="btn btn-primary">Сохранить</button>
</div>
}


but my validation works only for Required and
RegularExpression
and doesn't work for
MinLength
and
MaxLength
and I don't get any error message in this case.

What can be a reason?

Answer

MaxLength is used for the Entity Framework to decide how large to make a string value field when it creates the database.

From MSDN:

Specifies the maximum length of array or string data allowed in a property.

StringLength is a data annotation that will be used for validation of user input.

From MSDN:

Specifies the minimum and maximum length of characters that are allowed in a data field.

Non Customized

Use [String Length]

[RegularExpression(@"^.{5,}$", ErrorMessage = "Minimum 3 characters required")]
[Required(ErrorMessage = "Required")]
[StringLength(30, MinimumLength = 3, ErrorMessage = "Invalid")]

30 is the Max Length
Minimum length = 3

Customized StringLengthAttribute Class

public class MyStringLengthAttribute : StringLengthAttribute
{
    public MyStringLengthAttribute(int maximumLength)
        : base(maximumLength)
    {
    }

    public override bool IsValid(object value)
    {
        string val = Convert.ToString(value);
        if (val.Length < base.MinimumLength)
            base.ErrorMessage = "Minimum length should be 3";
        if (val.Length > base.MaximumLength)
            base.ErrorMessage = "Maximum length should be 6";
        return base.IsValid(value);
    }
}

public class MyViewModel
{
    [MyStringLength(6, MinimumLength = 3)]
    public String MyProperty { get; set; }
}
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