为DbContext中的每个DbSet准备字段和显示名称的列表

Question

在我的项目（MVC5，EF6，.Net4.8）中，我需要准备一个文档，其中包含所有字段名称及其DisplayName的列表。例如，我的DbContext中具有以下类：

public class Teacher
{
    [Key]
    public int Id { get; set; }
    [Display(Name = "First name of the teacher")]
    public string FirstName { get; set; }
    [Display(Name = "Last name of the teacher")]
    public string LastName { get; set; }
    [Display(Name = "Phone number of the teacher")]
    public string Phone { get; set; }
}

public class Student
{
    [Key]
    public int Id { get; set; }
    [Display(Name = "First name of the student")]
    public string FirstName { get; set; }
    [Display(Name = "Last name of the student")]
    public string LastName { get; set; }
    [Display(Name = "Birthdate of the student")]
    public DateTime Birthdate { get; set; }
}

而且我需要每个字段名称及其对应的DisplayName的列表，如下所示：

["Teacher", "Id", null]
["Teacher", "FirstName", "First name of the teacher"]
["Teacher", "LastName", "Last name of the teacher"]
["Teacher", "Phone", "Phone number of the teacher"]

["Student", "Id", null]
["Student", "FirstName", "First name of the student"]
["Student", "LastName", "Last name of the student"]
["Student", "Birthdate", "Birthdate of the student"]

是否可以自动创建这样的列表？

Answer 1

您可以使用反射：

typeof(YourContext)
    .GetProperties()
    .Where(prop => prop.PropertyType.IsGenericType
        && prop.PropertyType.GetGenericTypeDefinition() == typeof(DbSet<>))
    .SelectMany(dbSet => dbSet.GetGenericArguments()
        .Single()
        .GetProperties()
        .Select(prop => new [] { prop.DeclaringType.Name, prop.Name, prop.GetCustomAttribute<DisplayAttribute>()?.Name }))
    .ToList();

Answer 2

您可以使用Reflection获得预期的结果：

private static List<List<string>> GetMembers(Type type)
{
    return type.GetProperties()
    .Select(x => new List<string> 
    { 
        type.Name, 
        x.Name, 
        (x.GetCustomAttribute(typeof(DisplayAttribute)) is DisplayAttribute displayAttribute) ? displayAttribute.Name : null 
    })
    .ToList();
}

测试

List<List<string>> mebmers = GetMembers(typeof(Teacher));

结果：

foreach(var item in mebmers)
{
   Console.WriteLine(string.Join(",", item));
}

我希望能帮到您。