回购方法未将数据返回到控制器（ASP.NET）

Question

I have repo method to get data from db

Here is repo method

 public List<PatientMasterDataViewModel> GetPatientData(string name)
    {
        using (var ctx = new ApplicationDbContext())
        {
            List<PatientMasterDataViewModel> patientdata = new List<PatientMasterDataViewModel>();
            var items = ctx.Patients.Where(x => x.Name.Contains(name)).ToList();
            for (int i = 1; i < items.Count; i++)
            {
                patientdata.Add(new PatientMasterDataViewModel
                {
                    Id = items[i].Id,
                    Name = items[i].Name,
                    Birthday = items[i].Date_of_Birthday
                });
            }

            return patientdata;
        }
    }

after this I need to get this data in controller method

Here is controller method

public JsonResult PatientMasterDataInfo(string name)
    {
        var masterdatainfo = _repository.GetPatientData(name);
        return Json(masterdatainfo.ToArray(), JsonRequestBehavior.AllowGet);
    }

In Repo in items I have data

Here is screen

enter image description here

But for some reasons it not adding to patientdata and as result in controller I have null.

Where is my trouble?

Answer 1

You have loop started from 1. Please start it from 0 index.

public List<PatientMasterDataViewModel> GetPatientData(string name)
{
    using (var ctx = new ApplicationDbContext())
    {
        List<PatientMasterDataViewModel> patientdata = new List<PatientMasterDataViewModel>();
        var items = ctx.Patients.Where(x => x.Name.Contains(name)).ToList();
        for (int i = 0; i < items.Count; i++)
        {
            patientdata.Add(new PatientMasterDataViewModel
            {
                Id = items[i].Id,
                Name = items[i].Name,
                Birthday = items[i].Date_of_Birthday
            });
        }

        return patientdata;
    }
}

Answer 2

It should not be null as per your code what you have but i see one issue in your code which is your loop is string from 1 not 0 so change it to :

for (int i = 0; i < items.Count; i++)
{
}