Question

我使用ASP .NET MVC4 WebAPI，我有一些类

public class Recipe
{
    [BsonId]
    [BsonRepresentation(BsonType.ObjectId)]
    public string _id { get; set; }

    [BsonElement]
    [Display(Name = "Title")]
    public string Title { get; set; }

    [BsonElement]
    [Display(Name = "Description")]
    public string Description { get; set; }

    [BsonElement]
    [Display(Name = "Cost")]
    public int Cost { get; set; }

    [BsonElement]
    [Display(Name = "CategoryId")]
    public string CategoryId { get; set; }

    [BsonElement]
    [Display(Name = "ProductList")]
    public List<string> ProductList { get; set; }

    [BsonConstructor]
    public Recipe(string title, string description, string type, int cost, List<string> productList)
    {
        Title = title;
        Description = description;
        CategoryId = type;
        Cost = cost;
        ProductList = productList;
    }
}

比我在mongoDB中提取一些文件

var collection = database.GetCollection<Recipe>("Recipes");
var doc = collection.FindAllAs<Recipe>(); // exception

为什么我得到这个例外

＆＃34;该物业＆＃39; _id＆＃39;类型＆＃39; CourseServer.Models.Recipe＆＃39;不能使用元素名称＆＃39; _id＆＃39;因为它已被财产“_id＆＃39;。＆＃34;

使用

我有类Person，我使用相同的属性，它可以工作。

public class Person
{
    [BsonId]
    [BsonRepresentation(BsonType.ObjectId)]
    public string _id { get; set; } // and other some fields

Answer 1

_id由MongoDb保留。尝试使用＆＃34; Id＆＃34;代替。

Answer 2

我认为你的班级应该是这样的：

[DataContract]
    public class Recipe
    {
        public Recipe()
        {
            Title = "";
            Description = "";
            CategoryId = "";
            Cost = cost;
            ProductList = new List<string>();
        }

        [BsonId]
        public ObjectId _id { get; set; }

        [DataMember]
        public string Id
        {
            get { return _id.ToString(); }
            set { _id = ObjectId.Parse(value); }
        }    

        [DataMember]
        public string Title { get; set; }

        [DataMember]
        public string Description { get; set; }

        [DataMember]
        public int Cost { get; set; }

        [DataMember]
        public string CategoryId { get; set; }

        [DataMember]
        public List<string> ProductList { get; set; }  
    }

Answer 3

道格约翰逊是对的。检查一下，你应该能够进行调整。

https://groups.google.com/forum/#!topic/mongodb-user/NXrED5i7Imo

MongoDB c# driver - Can a field called Id not be Id?

Answer 4

您是否尝试过也包括Bson元素名称在模型上声明的代码示例

[BsonElement("ProductList")]

[Display(Name = "ProductList")]

public List<string> ProductList { get; set; }

也可以参考，https://www.c-sharpcorner.com/article/simple-crud-operation-using-asp-net-mvc-and-mongodb/

麻烦与mongoDB。该物业＆＃39; _id＆＃39;类型...不能使用元素名称＆＃39; _id＆＃39;

4 个答案: