C# 如何使用数据库中的数据构建模型对象？

我想从数据库中读取这些值，并将它们输入到

textboxfor

如何使用数据库中的数据构建Karta模型对象

控制器：

[HttpPost]
public async Task<ActionResult> PartialTabelaEcp()
{
    // for example:
    var numerMiesiaca = 1;
    var numerRoku = 2020;
    var userName = _httpContextAccessor.HttpContext.User.Identity.Name;

    // here I write to the start value database (the ones I want to load from the database)
    var dbExists = _ecpContext.Karta.FirstOrDefault(f => f.DzMiesiaca == 1 && f.Miesiac == numerMiesiaca && f.Rok == numerRoku && f.Login == userName);

    if (dbExists == null)
    {
           // I've done it, it works for me
    }

    if (dbExists != null)
    {
        var nrIdBase = _ecpContext.Karta.FirstOrDefault(f => f.DzMiesiaca == 1 && f.Miesiac == numerMiesiaca && f.Rok == numerRoku && f.Login == userName).Id;

        for (int i = 1; i <= liczbaDni; i++)
        {
            // here I want read this data
            // from database and send to textboxfor to partialview
        }
    }

    return PartialView("_TabelaEwidencja" );
}

---

这是你想要做的事情吗

[HttpPost]
public async Task<ActionResult> PartialTabelaEcp()
{
    // for example:
    var numerMiesiaca = 1;
    var numerRoku = 2020;
    var userName = _httpContextAccessor.HttpContext.User.Identity.Name;

    // you don't need to check for existing data and then get it in seperate calls to the db, just get a list at once and it will have 0+ elements.
    var karta = _ecpContext.Karta.Where(f => f.DzMiesiaca == 1 && f.Miesiac == numerMiesiaca && f.Rok == numerRoku && f.Login == userName).ToList();

    var kartaList = new List<Karta_Model>();
    if (karta.Any())
    {
        karta.ForEach(x => {
            kartaList.Add(new Karta_Model{
                //map properties here
            };
        });
    }

    //pass the list to the partial view
    return PartialView("_TabelaEwidencja", kartaList );
}

---

您使用的是

FirstOrDefault（）

，因此只获取一行，而不是列表。你的问题一点也不清楚。您在获取数据方面有问题吗？！或者在

视图中显示它们时出现问题

？！

@using AppEcp.Models
@model ParentView

@Html.TextBoxFor(m => m.Model1[nr_rows].Rozpoczecie, new { @class = "start", @type = "time" })
@Html.TextBoxFor(m => m.Model1[nr_rows].Zakonczenie, new { @class = "end", @type = "time" })
@Html.TextBoxFor(m => m.Model1[nr_rows].OdbiorGodzin, new { @class = "gethours", @type = "time" })

[HttpPost]
public async Task<ActionResult> PartialTabelaEcp()
{
    // for example:
    var numerMiesiaca = 1;
    var numerRoku = 2020;
    var userName = _httpContextAccessor.HttpContext.User.Identity.Name;

    // you don't need to check for existing data and then get it in seperate calls to the db, just get a list at once and it will have 0+ elements.
    var karta = _ecpContext.Karta.Where(f => f.DzMiesiaca == 1 && f.Miesiac == numerMiesiaca && f.Rok == numerRoku && f.Login == userName).ToList();

    var kartaList = new List<Karta_Model>();
    if (karta.Any())
    {
        karta.ForEach(x => {
            kartaList.Add(new Karta_Model{
                //map properties here
            };
        });
    }

    //pass the list to the partial view
    return PartialView("_TabelaEwidencja", kartaList );
}

@foreach (var karta in Model) {
    @Html.TextBoxFor(m => karta.Rozpoczecie, new { @class = "start", @type = "time" })
    @Html.TextBoxFor(m => karta.Zakonczenie, new { @class = "end", @type = "time" })
    @Html.TextBoxFor(m => karta.OdbiorGodzin, new { @class = "gethours", @type = "time" })
}