[英]How fill custom class in View in asp.net core 2.1
我有幾個模型,它們像這樣一組在一起:
public class AllData
{
public Category Category {get;set;} // just two string properties ID and Name
public SubCategory SubCategory {get;set;} // three string properties ID, Name, Parent_ID
}
而且我有一個視圖,如果我只是做標准填充
<input asp-for="SubCategory.Name" class="form-control" />
他們返回null,為什么會這樣,所有這些都公開,並且已經設置
所有視圖:
@model CategoryBD.Models.AllData
@{
ViewData["Title"] = "Create";
}
<h2>Create</h2>
<h4>Subcategory</h4>
<hr />
<div class="row">
<div class="col-md-4">
<form asp-action="Create">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<div class="form-group">
<label asp-for="subcategory.Name" class="control-label"></label>
<input asp-for="subcategory.Name" class="form-control" />
<span asp-validation-for="subcategory.Name" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="subcategory.Parent_ID" class="control-label"></label>
<input asp-for="subcategory.Parent_ID" class="form-control" />
<span asp-validation-for="subcategory.Parent_ID" class="text-danger"></span>
</div>
<div class="form-group">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</form>
</div>
</div>
<div>
<a asp-action="Index">Back to List</a>
</div>
@section Scripts {
@{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}
控制器:
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create(AllData subcategory)
{
if (ModelState.IsValid)
{
_context.Add(subcategory);
await _context.SaveChangesAsync();
return RedirectToAction(nameof(Create));
}
return View(subcategory);
}
在控制器中subcategory.subcategory始終為null,即使僅創建如下變量:
public SubCategory SubCategory = new SubCategory();
問題在於模型綁定的一致性。 從視圖傳遞的是一個包含兩個字符串類型字段的對象,而操作中的參數包含兩個對象類型字段。
嘗試進行以下代碼更改
視野中
<form asp-action="Create">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<div class="form-group">
<label asp-for="@Model.SubCategory.Name" class="control-label"></label>
<input asp-for="@Model.SubCategory.Name" class="form-control" />
<span asp-validation-for="@Model.SubCategory.Name" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="@Model.SubCategory.Parent_ID" class="control-label"></label>
<input asp-for="@Model.SubCategory.Parent_ID" class="form-control" />
<span asp-validation-for="@Model.SubCategory.Parent_ID" class="text-danger"></span>
</div>
<div class="form-group">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</form>
控制器:
public async Task<IActionResult> Create(SubCategory subcategory)
{
}
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