从现有 MVC 创建

Question

所以我有我的模型，我想从下拉列表中选择的现有植物创建一个新植物，该植物具有与旧植物相同的属性，除了科学 name.I 创建的函数将采用新工厂名称和旧工厂并使用旧工厂创建新工厂 properties.I 想知道我应该在我的控制器中做什么并查看才能从现有工厂创建这个新工厂。

这是我的模型

public class ExistingPlant
{

    public string selectedPlant { get; set; }
    public Dictionary<Guid,string> plantList { get; set; }
}

这是我的控制器代码

public ActionResult CreateFrom()
    {
        ExistingPlant existing = new ExistingPlant();

        Dictionary<Guid, string> plants = new Dictionary<Guid, string>();

        foreach(var item in context.Plants){

            plants.Add(item.PlantId , item.ScientificName);
             }

        existing.plantList = plants;
        existing.selectedPlant = "Value";

        var plant = context.Plants.Where(d => d.ScientificName == existing.selectedPlant);
        string temp = existing.selectedPlant;
        Plant p = (Plant) plant;
        CopyExisting(p,temp);

        return View(existing);
    }

和我的查看代码：

@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)
<fieldset id="field">
    <div>
        <label> Scientific Name:</label>
    </div>

    <div class="editor-field">
        @Html.EditorFor(m => m.selectedPlant)
        @Html.ValidationMessageFor(m =>m.selectedPlant)
    </div>

    <p>
        <input type="submit" value="Create" />
    </p>

</fieldset>
@Html.DropDownListFor(
    m => m.selectedPlant,
    new SelectList(Model.plantList, "Key", "Value")
)

}

Answer 1

您的视图模型中需要一个属性用于新名称，当您提交表单时，获取选定的植物，克隆它，根据视图模型更新学名并保存。

将您的视图模型更改为

public class CopyPlantVM
{
  [Display(Name = "Existing Plant")]
  [Required(ErrorMessage = "Please select an existing plant")]
  public Guid ExistingPlant { get; set; }
  public SelectList ExistingPlantList { get; set; }
  [Display(Name = "New scientific name")]
  [Required(ErrorMessage = "Please enter new scientific name")]
  public string Name { get; set; }
}

以及对

的看法

@model CopyPlantVM
@using (Html.BeginForm())
{
  @Html.LabelFor(m => m.ExistingPlant)
  @Html.DropDownListFor(m => m.ExistingPlant, Model.ExistingPlantList, "Please select")
  @Html.ValidationMessageFor(m => m.ExistingPlant)

  @Html.LabelFor(m => m.Name)
  @Html.TextBoxFor(m => m.Name)
  @Html.ValidationMessageFor(m => m.Name)

  <input type="submit" value="Create" />
}

控制器方法

public ActionResult CreateFrom()
{
  CopyPlantVM model = new CopyPlantVM();
  ConfigureViewModel(model);
  return View(model);
}

[HttpPost]
public ActionResult CreateFrom(CopyPlantVM model)
{
  if (!ModelState.IsValid)
  {
    ConfigureViewModel(model);
    return View(model);
  }
  // Get the selected plant
  Plant existingPlant = db.Plants.Where(p => p.PlantID = model.ExistingPlant).FirstOrDefault();
  // Create a new plant based on existing plant but with new name
  Plant newPlant = new Plant
  {
    ScientificName = model.Name,
    // set other properties based on existing plant
  };
  db.Plants.Add(newPlant);
  db.SaveChanges();
  return RedirectToAction(...);
}

private void ConfigureViewModel(CopyPlantVM model)
{
  model.ExistingPlantList = new SelectList(db.Plants, "PlantId", "ScientificName");
}

从现有 MVC 创建

Create from Existing MVC

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