我正在添加UpdateCustomer
方法,该方法将经过修改的客户传递给数据库,以将其持久化。但是在更新文档上调用ReplaceOneAsync
时遇到错误。
我已经咨询了以下example和api reference,它们都声明要传递ReplaceOneAsync
和filter
和document
参数。
但是由于不正确的参数而引发特定错误,如下所述:
Error 1 The best overloaded method match for 'MongoDB.Driver.IMongoCollection<MongoDBApp.Models.CustomerModel>.ReplaceOneAsync(MongoDB.Driver.FilterDefinition<MongoDBApp.Models.CustomerModel>, MongoDBApp.Models.CustomerModel, MongoDB.Driver.UpdateOptions, System.Threading.CancellationToken)' has some invalid arguments
Error 2 Argument 2: cannot convert from 'MongoDB.Bson.BsonDocument' to 'MongoDBApp.Models.CustomerModel'
有人对弄明白错误有任何提示吗?
UpdateCustomer
方法:
public async Task UpdateCustomer(CustomerModel customer)
{
var collection = StartConnection();
var filter = Builders<CustomerModel>.Filter.Where(x => x.Id == customer.Id);
BsonDocument doc = new BsonDocument();
doc["_id"] = customer.Id;
doc["firstName"] = customer.FirstName;
doc["lastName"] = customer.LastName;
doc["email"] = customer.Email;
//error thrown here on the ReplaceOneAsync params..
await collection.ReplaceOneAsync(filter, doc);
}
以及相关的StartConnection方法:
private static IMongoCollection<CustomerModel> StartConnection()
{
var client = new MongoClient(connectionString);
var database = client.GetDatabase("orders");
//Get a handle on the customers collection:
var collection = database.GetCollection<CustomerModel>("customers");
return collection;
}
您需要一直使用类型化集合,这意味着要插入CustomerModel
而不是BsonDocument
的实例:
await collection.ReplaceOneAsync(filter, customer);
或将无类型的字符与BsonDocument
一起使用,但从一开始就这样做:
var collection = database.GetCollection<BsonDocument>("customers");
由于混用了这两个选项,因此出现了这些编译错误。
这对我有用
var filter = Builders.Filter.Where(x => x.Id == customer.Id);
await Collection.ReplaceOneAsync(filter, item, new ReplaceOptions { IsUpsert = true });