EF 5忽略Int类型的[Required]属性 [英] EF 5 Is Ignoring [Required] Attribute On Int Type

问题描述

当包含在int字段中时，Entity Framework 5.0.0似乎忽略[Required]属性，并自动包含0值而不是引发异常.但是，如果该字段是字符串，则required属性似乎确实起作用.下面的简单模型和创建函数不会引发任何异常.为简洁起见，未显示具有DbSet度的DbContext类.

Entity Framework 5.0.0 seems to ignore the [Required] attribute when included on an int field and automatically includes a 0 value instead of throwing an exception. The required attribute does seem to work if the field is a string though. The simple model and create function below throws no exceptions. DbContext class with DbSet Degrees not shown for brevity.

public class Degree
{
    public int Id { get; set; }
    public string Name { get; set; }
    [Required]
    public int Field { get; set; }
}


private static void CreateDegree()
{
    var degree = new Degree { Name = "Mechanical Engineering" };
    var db = new Context();
    db.Degrees.Add(degree);

    // try statement
}

这对我来说可能是一个简单的误解，但是任何想法/帮助都将不胜感激.

This maybe a simple misunderstanding on my part, but any thoughts / help would be greatly appreciated.

推荐答案

[Required]属性指示必须存在一个值.构造Degree时，将Field初始化为0，因为这是int的默认值.由于0是一个值，因此它满足[Required]属性.

The [Required] attribute indicates that a value must be present. When a Degree is constructed, Field is initialized to 0 because that is the default value for ints. Since 0 is a value, it satisfies the [Required] attribute.

您可能想尝试使用[Range]属性来指定该值必须大于0.或者您可以将模型更改为具有int?，这样它将成为null，除非将其初始化为一些价值.

You may want to try a [Range] attribute to specify that the value must be greater than 0. Or you could change the model to have an int?, so that it would be null unless it got initialized to some value.

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