有沒有一種更簡單的方法來撰寫我的代碼，而不是在我添加引數時手動撰寫每個ifelse

我正在嘗試執行搜索功能，但我想添加用戶可以在搜索中執行的所有可能性，但我仍然是初學者，所以我想知道是否有更簡單的方法可以做到這一點，而不是在每個上都寫 else if范圍。

  public JsonResult getAll( string devname, string status1 , string pnumber)
        {
            List<SavePhone> reportList = new List<SavePhone>();
            List<SavePhone> p = new List<SavePhone>();
            p = GetAllReports();
            
            if (devname=="nulls" && status1 == "nulls" && pnumber=="nulls" )
            {
                return Json(p, JsonRequestBehavior.AllowGet);
            }
            else if(devname != "nulls" && status1 != "nulls" && pnumber != "nulls")
            {
                for (int i = 0; i < p.Count; i  )
                {
                    reportList = p.Where(x => x.DeviceName == devname && x.PNB == pnumber && x.Status==status1).ToList();
                }
            } else if(devname != "nulls" && status1 != "nulls" && pnumber == "nulls")
            {
                for (int i = 0; i < p.Count; i  )
                {
                    reportList = p.Where(x => x.DeviceName == devname && x.Status == status1).ToList();
                }

            }
            else if (devname != "nulls" && status1 == "nulls" && pnumber != "nulls")
            {
                for (int i = 0; i < p.Count; i  )
                {
                    reportList = p.Where(x => x.DeviceName == devname && x.PNB == pnumber).ToList();
                }
            }
            else if (devname == "nulls" && status1 != "nulls" && pnumber != "nulls")
            {
                for (int i = 0; i < p.Count; i  )
                {
                    reportList = p.Where(x => x.PNB == pnumber && x.Status == status1).ToList();
                }
            }
            else if(devname != "nulls" && status1 == "nulls" && pnumber == "nulls")
            {
                for (int i = 0; i < p.Count; i  )
                {
                    reportList = p.Where(x => x.DeviceName == devname).ToList();
                }

            }
            else if (devname == "nulls" && status1 != "nulls" && pnumber == "nulls")
            {
                for (int i = 0; i < p.Count; i  )
                {
                    reportList = p.Where(x => x.Status == status1).ToList();
                }

            }
            else if (devname == "nulls" && status1 == "nulls" && pnumber != "nulls")
            {
                for (int i = 0; i < p.Count; i  )
                {
                    reportList = p.Where(x => x.PNB == pnumber).ToList();
                }

            }
         
            var JsonResult = Json(reportList, JsonRequestBehavior.AllowGet);
            return JsonResult;
        } 

有沒有一種方法可以讓代碼自動為我完成，而無需手動添加每個引數，因為如果我有 10 個引數，那將需要很長時間。

uj5u.com熱心網友回復：

.Where您可以通過為每個引數鏈接 a 來構建您的 LINQ 查詢。

IEnumerable<SavePhone> query = p;

if (devname != 'nulls') 
{
  query = query.Where(x => x.DeviceName == devname);
}

if (status1 != 'nulls')
{
  query = query.Where(x => x.Status1 == status1);
}

//etc.

var reportList = query.ToList();

我不確定你為什么有那個for回圈，我認為它不需要。

標籤：C＃ angularjs 循环

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