{"Element '_id' does not match any field or property of class."}

小渣渣

{"Element '_id' does not match any field or property of class."}

System.AggregateException: One or more errors occurred. ---> System.FormatException: Element '_id' does not match any field or property of class MongoDBCRUD.Program+BOSBourse. at MongoDB.Bson.Serialization.BsonClassMapSerializer`1.DeserializeClass(BsonDeserializationContext context)

[...]

at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() at MongoDBCRUD.Program.d__1.MoveNext() in C:\Users\amin-\Documents\Visual Studio 2015\Projects\MongoDBCRUD\MongoDBCRUD\Program.cs:line 60<---

登录可见。

public ObjectId _id { get; set; }

这个必须得有，而且，数据库有什么字段，对象就要定义什么属性，而且属性的类型还要和数据库里面存入的类型一致，

真是坑啊！！！！否则会抛异常

小渣渣

//_id 属性必须要有，否则在更新数据时会报错:“Element '_id' does not match any field or property of class”。
        public ObjectId _id; //BsonType.ObjectId 这个对应了 MongoDB.Bson.ObjectId