如何在 C# 中迭代​​数组值并更新多条记录 [关闭]

Question

我想根据数组值更新多条记录。 “userid”和“orderid”是用逗号分隔的数组值。我想遍历数组值并更新firestore的记录。用户 ID 和订单 ID 将具有相同的索引。有多少用户，那么多少 orderid 就会有多少。

示例 webapi

https://localhost:44308/AssignTruck/djK2BjrTTnuLSqD8LbeZ,djK2BjrTTnuLSqD8LbeZ/PdTXq6Rk0WfJK9FQV8vt,TmHhOapTNaZco4PcCF8j/S-1

userid - djK2BjrTTnuLSqD8LbeZ,djK2BjrTTnuLSqD8LbeZ
docid -  PdTXq6Rk0WfJK9FQV8vt,TmHhOapTNaZco4PcCF8j

代码

[HttpGet("/AssignTruck/{userid}/{orderid}/{shipid}")]
        public async Task<ActionResult> AssignTruck(string userid, string orderid, string shipid)
        {
            {
                FirestoreDb db = FirestoreDb.Create("trucks");
                DocumentReference docRef = db.Collection("users/" + userid + "/orders").Document(orderid);
                DocumentSnapshot snapshot = await docRef.GetSnapshotAsync();
                Truck truck = null;
                if (snapshot.Exists)
                {
                    truck = snapshot.ConvertTo<Truck>();
                    truck.Docid = snapshot.Id;
                    truck.shipId = shipid;
                }
                else
                {
                }
                await docRef.SetAsync(truck);
                return RedirectToAction("tables");
            }
        }

Answer 1

假设userids和orderids对应同一个index，你的代码应该如下：

    [HttpGet("/AssignTruck/{userid}/{orderid}/{shipid}")]
    public async Task<ActionResult> AssignTruck(string userid, string orderid, string shipid)
    {
        string[] uIds= userid.Split(',');
        string[] oIds= orderid.Split(',');

        for(int i=0; i<uIds.Length(); i++) {              
            FirestoreDb db = FirestoreDb.Create("trucks");
            DocumentReference docRef = db.Collection("users/" + uIds[i] + "/orders").Document(oIds[i]);
            DocumentSnapshot snapshot = await docRef.GetSnapshotAsync();
            Truck truck = null;
            if (snapshot.Exists)
            {
                truck = snapshot.ConvertTo<Truck>();
                truck.Docid = snapshot.Id;
                truck.shipId = shipid;
            }

            await docRef.SetAsync(truck);
            
        }
        return RedirectToAction("tables");
    }