[英]How fill custom class in View in asp.net core 2.1
我有几个模型,它们像这样一组在一起:
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
}
而且我有一个视图,如果我只是做标准填充
<input asp-for="SubCategory.Name" class="form-control" />
他们返回null,为什么会这样,所有这些都公开,并且已经设置
所有视图:
@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始终为null,即使仅创建如下变量:
public SubCategory SubCategory = new SubCategory();
问题在于模型绑定的一致性。 从视图传递的是一个包含两个字符串类型字段的对象,而操作中的参数包含两个对象类型字段。
尝试进行以下代码更改
视野中
<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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