如何通过C＃类将包含子文档数组的文档插入到MongoDB中？ [英] How to Insert a document with array of subDocuments into MongoDB by C# classes?

问题描述

嗨
我是mongodb和C＃驱动程序的业余爱好者。

我尝试按类别插入包含子文档数组的文档。

my代码是这些：

这是我的课程：

  public   class 实体
 {
 
  public   string  name { get ;  set ; } 
  public   string  family { get ;  set ; } 
  public 列表< sc>得分{得到;  set ; } 
} 
 
  public   class  sc 
 { 
  public   int 数学{获取;  set ; } 
 
  public   int  copyright {获得;  set ; } 
} 

这是我填写字段的代码并插入文档：

< pre lang =c＃> var en = new Entity（）;
var sc1 = new sc（）;
var sc2 = new sc（）;
sc1.Math = 14 ;
sc1.literature = 15 ;
sc2.Math = 16 ;
sc2.literature = 19 ;
en.score [ 0 ] = sc1;
en.score [ 1 ] = sc2;
en.name = Esi;
en.family = Moja;
collection.Insert（en）;

但是当我运行它时会出现这个错误：

 对象引用不是 set 到 object 。

我该如何解决这个问题？请帮帮我。

解决方案

Hi I'm amateur with mongodb and C# driver.
I try to Insert a document with array of sub-documents by class.
my codes are these:
This is my classes:

public class Entity
        {

            public string name { get; set; }
            public string family { get; set; }
            public List<sc> score { get; set; }
        }

        public class sc
        {
            public int Math{ get; set; }

            public int literature{ get; set; }
        }

And this is my code for fill fields and insert document:

var en = new Entity();
            var sc1 = new sc();
            var sc2 = new sc();
            sc1.Math= 14;
            sc1.literature= 15;
            sc2.Math= 16;
            sc2.literature= 19;
            en.score[0] = sc1;
            en.score[1] = sc2;
            en.name = "Esi";
            en.family = "Moja";
            collection.Insert(en);

But i get this error when i run it:

Object reference not set to an instance of an object.

How can i fix this problem? Please help me.

解决方案

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