MangoDB在C#中的使用

http://blog.sina.com.cn/s/blog_927f3c2401011937.html 图形工具

http://api.mongodb.org/csharp/current/html/R_Project_CSharpDriverDocs.htm C#API

http://docs.mongodb.org/manual/reference/method/  Shell命令

http://docs.mongodb.org/manual/ MongoDB官方文档

http://blog.michaelckennedy.net/2013/04/08/optimistic-concurrency-in-mongodb-using-net-and-csharp/ MongoDB.Kennedy

https://mongodb-documentation.readthedocs.org/en/latest/ecosystem/tutorial/serialize-documents-with-the-csharp-driver.html   Serialize Documents with the CSharp Driver(使用c#对实体进行序列化)

https://www.mongodb.com/thank-you/download/mongodb-enterprise 官网下载地址

http://www.ttlsa.com/mms/follow-me-to-use-mongodb-mms-services/ 随我来使用mongodb mms服务

当类体结构改变，删除了某个属性，或者某个属性的类型发生了改变？

1、属性的类型发生了改变

 public class Address { public ObjectId Id; public string ZipCode; }

 public class ZipCodeSerializer : BsonBaseSerializer { public override object Deserialize(BsonReader bsonReader, Type nominalType, Type actualType, IBsonSerializationOptions options) { var bsonType = bsonReader.CurrentBsonType; switch (bsonType) { case BsonType.Null: bsonReader.ReadNull(); return null; case BsonType.String: return bsonReader.ReadString(); case BsonType.Int32: return bsonReader.ReadInt32().ToString(); default: var message = string.Format("ZipCodeSerializer expects to find a String or an Int32, not a {0}.", bsonType); throw new BsonSerializationException(message); } } public override void Serialize(BsonWriter bsonWriter, Type nominalType, object value, IBsonSerializationOptions options) { if (value == null) { bsonWriter.WriteNull(); } else { bsonWriter.WriteString((string)value); } } }

 BsonClassMap.RegisterClassMap<Address>(cm => { cm.AutoMap(); cm.GetMemberMap(a => a.ZipCode).SetSerializer(new ZipCodeSerializer()); });
 

2、删除了某个属性

 var allDocuments = collectionToUpdate .FindAll();foreach(var document in allDocuments ){var oldFieldValue = document ["OldFieldName"];if(!document.Contains("NewFieldName")) document.Add("NewFieldName", oldFieldValue); document.Remove("OldFieldName"); collectionToUpdate.Save(document);}

 3、使用newtonsoft.json转换为json

 class ObjectId Converter:JsonConverter{publicoverridevoidWriteJson(JsonWriter writer,object value,JsonSerializer serializer){ serializer.Serialize(writer, value.ToString());}publicoverrideobjectReadJson(JsonReader reader,Type objectType,object existingValue,JsonSerializer serializer){thrownewNotImplementedException();}publicoverride bool CanConvert(Type objectType){returntypeof(ObjectId).IsAssignableFrom(objectType);//return true;}}

         public class ObjectIdConverter : TypeConverter

         {

             public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)

             {

                 if (sourceType == typeof(string))

                 {

                     return true;

                 }

                 return base.CanConvertFrom(context, sourceType);

             }

             public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)

             {

                 if (value is string)

                     return ObjectId.Parse((string)value);

                 return base.ConvertFrom(context, culture, value);

             }

             // Overrides the ConvertTo method of TypeConverter.

             public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)

             {

                 if (destinationType == typeof(string))

                 {

                     return ((ObjectId)value).ToString();

                 }

                 return base.ConvertTo(context, culture, value, destinationType);

             }

         }
 

使用：[TypeConverter(typeof(ObjectIdConverter))]

4、实体中排除某些字段，不写入到集合中

publicclassMyClass{ [BsonIgnore]publicstringSomeProperty{get;set;}}

或者使用初始化代码的形式，设置映射关系

BsonClassMap.RegisterClassMap<MyClass>(cm=>{cm.AutoMap();cm.UnmapProperty(c=>c.SomeProperty);});

5、在连接参数中设置用户名和密码

http://docs.mongodb.org/ecosystem/tutorial/authenticate-with-csharp-driver/

6、mongodb中时间为当前小时数 减 8

分       析：存储在mongodb中的时间是标准时间UTC +0:00 而咱们中国的失去是+8.00 。

解决方法：在datetime属性上增加特性

[BsonDateTimeOptions(Kind = DateTimeKind.Local)]

public DateTime Birth{get;set;}