Question

我在序列化过程中遇到了问题。我已经花了很多时间，我找不到解决方案。我有一个类，我想序列化到一个文档集合。如果我班上有四个属性，一切都很棒，但是一旦我添加了另一个属性，我就有了这个例外：

An incorrect number of type args were specified for the declaration of a Func type.

这是我的代码：

   class Class1
   {
      [BsonId]
      public ObjectId _id { get; set; }

      public string Modelname { get; set; }
      public string Sn { get; set; }
      public string Filename { get; set; }

      public byte[] DataBin { get; set; }
      [BsonIgnore]
      public MyCustomClass data { get; set; }

      [BsonConstructor]
      public Class1()
      { }

      public Class1(string Modelname, string Sn, string Filename, MyCustomClass data)
      {
         this.Modelname = Modelname;
         this.Sn = Sn;
         this.Filename = Filename;
         this.data = data;

         BinaryFormatter formatter = new BinaryFormatter();
         using(MemoryStream stream = new MemoryStream())
         {
            formatter.Serialize(stream, this.data);
            this.DataBin = stream.ToArray();
         }
      }

      [BsonConstructor]
      public Class1(string Modelname, string Sn, string Filename, byte[] dataBin)
      {
         this.Modelname = Modelname;
         this.Sn = Sn;
         this.Filename = Filename;
         this.DataBin = dataBin;

         BinaryFormatter formatter = new BinaryFormatter();
         using(MemoryStream stream = new MemoryStream(this.DataBin))
         {
            this.data = (MyCustomClass)formatter.Deserialize(stream);
         }
      }
   }

类Class1在我的集合中很好地序列化了。

     MongoClient client = new MongoClient();
     MongoServer server = client.GetServer();
     MongoDatabase database = server.GetDatabase("mydb");
     MongoCollection<Class1> collection = database.GetCollection<Class1>("testCollection");
     MyCustomClass data = new MyCustomClass();
     Class1 doc = new Class1("test", "sn", "filename", data);
     collection.Save<Class1>(doc);

但是，如果我添加另一个属性，则抛出异常：

   class Class1
   {
      [BsonId]
      public ObjectId _id { get; set; }

      public string Modelname { get; set; }
      public string Sn { get; set; }
      public string Filename { get; set; }

      public double Num { get; set; }

      public byte[] DataBin { get; set; }
      [BsonIgnore]
      public MyCustomClass data { get; set; }

      [BsonConstructor]
      public Class1()
      { }

      public Class1(string Modelname, string Sn, string Filename, double Num, MyCustomClass data)
      {
         this.Modelname = Modelname;
         this.Sn = Sn;
         this.Filename = Filename;
         this.Num = Num;
         this.data = data;

         BinaryFormatter formatter = new BinaryFormatter();
         using(MemoryStream stream = new MemoryStream())
         {
            formatter.Serialize(stream, this.data);
            this.DataBin = stream.ToArray();
         }
      }

      [BsonConstructor]
      public Class1(string Modelname, string Sn, string Filename, double Num, byte[] dataBin)
      {
         this.Modelname = Modelname;
         this.Sn = Sn;
         this.Filename = Filename;
         this.Num = Num;
         this.DataBin = dataBin;

         BinaryFormatter formatter = new BinaryFormatter();
         using(MemoryStream stream = new MemoryStream(this.DataBin))
         {
            this.data = (MyCustomClass)formatter.Deserialize(stream);
         }
      }
   }

Answer 1

好的，我发现了这个问题。我尝试使用另一种解决方案在同一台计算机上，一切正常。所以我将代码复制到我的实际解决方案中并且它不起作用：相同的代码，相同的计算机，但结果不同！最后，我意识到我的实际解决方案使用的是.NET 3.5。我将其更改为.NET 4.0，它可以工作！

结论：官方的C＃驱动程序据说是在.NET 3.5下构建的，但它在.NET 4.0下运行得更好

Mongodb C＃带驱动1.9序列化参数数量有限？

1 个答案: