private static async void Update()
{
//User u = new User() { Name = "xiaopangu", Age = 22, UserID = 1 };
//var filter = Builders<User>.Filter.Eq(u=>u.UserID, 1);
//var filter = Builders<User>.Filter.Where(u => u.UserID == 1);
//var update = Builders<User>.Update.Set(u => u.Name, "xiaopangu");
User u = new User() { UserID = 2, Age = 111, Name = "xiaopangu2", Id = new ObjectId("56213446f8a4413d38eb5ebd") };
await db.UpdateAsync<User>("user", e => e.UserID == 2, u);
//await db.UpdateAsync<User>("user", u);
Console.WriteLine("Update successfully");
//await db.GetCollection<User>("user").UpdateOneAsync(filter, update);
//await db.UpdateOneAysnc<User>("user", u => u.UserID, 1, "name", "xiaopangu");
}
private static async void Test()
{
//var projection = Builders<User>.Projection.Expression(u => new { name = u.Name });
//var list = db.GetCollection<User>("user").Aggregate().Match(u => u.Name == "xiaopotian").ForEachAsync(u => { Console.WriteLine(u.Name); });
//db.GetCollection<User>("user").UpdateOneAsync<User>(u=>u.Name=="xiaopotian",MongoQueryable<User>)
//User entity = await db.GetCollection<User>("user").Find(u => u.Name == "xiaopotian").FirstOrDefaultAsync();
//entity.Name = "xiaopangu";
User uu = new User { Name = "xiaopangu", Age = 22, UserID = 1 };
await db.GetCollection<User>("user").ReplaceOneAsync<User>(u => u.Name == "xiaopangu", uu);
}