我对编程非常陌生，而且我非常简单地使用＃34;创建＆＃34;控制器和视图。
在视图中，用户声明值，应该传递给数据库。这是模特：
public class Expense
{
public int ExpenseID { get; set; }
[DisplayName("Data")]
[Column(TypeName = "DateTime2")]
public DateTime Date { get; set; }
[DisplayName("Wartość")]
public decimal Amount { get; set; }
[DisplayName("Opis")]
public string Details { get; set; }
[DisplayName("Rodzaj")]
public int CategoryID { get; set; }
public virtual Category Category { get; set; }
}
public class Category
{
public int CategoryID { get; set; }
public string Name { get; set; }
public virtual ICollection<Expense> Expenses { get; set; }
}
在同一视图中，我想要包含用于管理类别的部分视图（添加，删除）。
为了实现这一点，我实施了ViewModel：
public class ExpenseCreateViewModel
{
public Expense ExpenseCreate { get; set; }
public Category CategoryCreate { get; set; }
}
以下是我的观点代码：
@model Wydatki2._0.Models.ExpenseCreateViewModel
@{
ViewBag.Title = "Create";
}
<h2>Dodaj wydatek</h2>
<table class="table">
<tr>
<th>
<div>
@using (Html.BeginForm("CreateExpense", "ExpenseCreate", FormMethod.Post, new { }))
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
<div class="form-group">
@Html.LabelFor(model => model.ExpenseCreate.CategoryID, "Rodzaj", htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("CategoryID", null, htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.ExpenseCreate.CategoryID, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.ExpenseCreate.Amount, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.ExpenseCreate.Amount, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.ExpenseCreate.Amount, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.ExpenseCreate.Date, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.ExpenseCreate.Date, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.ExpenseCreate.Date, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.ExpenseCreate.Details, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.ExpenseCreate.Details, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.ExpenseCreate.Details, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Dodaj" class="btn btn-default" />
</div>
</div>
</div>
}
</div>
</th>
<th>
<div>
<input type="button" id="btn" class="btn btn-default" value="Dodaj/Usuń Kategorię" />
<p class="error">@ViewBag.Warning</p>
</div>
<div id="Create" style="display:none">
@Html.Partial("CreateCategory", Model.CategoryCreate)
</div>
</th>
</tr>
</table>
@section Scripts {
@Scripts.Render("~/bundles/jqueryval")
@Scripts.Render("~/bundles/toggle")
}
问题是，当我提交表单时，只能正确传递CategoryID值。其余参数只有默认值。部分视图效果很好 - 我可以添加或删除类别，然后将其传递到主视图。
我的控制器的代码：
namespace Wydatki2._0.Controllers
{
public class ExpenseCreateController : Controller
{
private WydatkiContext db = new WydatkiContext();
public ActionResult Create(bool? warn = false)
{
ExpenseCreateViewModel model = new ExpenseCreateViewModel()
{
ExpenseCreate = new Expense(),
CategoryCreate = new Category()
};
var query = from b in db.Categories
where b.CategoryID != 1
select b;
if (warn.GetValueOrDefault())
{
ViewBag.Warning = "Nie możesz usunąć tej kategorii.";
}
ViewBag.CategoryID = new SelectList(query, "CategoryID", "Name");
return View(model);
}
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult CreateExpense([Bind(Include = "ExpenseID,Date,Amount,Details,CategoryID")] Expense expense)
{
if (ModelState.IsValid)
{
db.Expenses.Add(expense);
db.SaveChanges();
return RedirectToAction("Create");
}
var query = from b in db.Categories
where b.CategoryID != 1
select b;
ViewBag.CategoryID = new SelectList(query, "CategoryID", "Name", expense.CategoryID);
return View(expense);
}
public ActionResult CreateCategory()
{
return View();
}
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult CreateCategory([Bind(Include = "CategoryID,Name")] Category category)
{
if (ModelState.IsValid)
{
Category cat = db.Categories.FirstOrDefault(c => c.Name== category.Name);
if (cat != null)
{
if (cat.CategoryID == 1 || cat.CategoryID ==2)
{
return RedirectToAction("Create", new { warn = true });
}
else
{
db.Categories.Remove(cat);
db.SaveChanges();
return RedirectToAction("Create");
}
}
else
{
db.Categories.Add(category);
db.SaveChanges();
return RedirectToAction("Create");
}
}
return View(category);
}
我倾向于认为这个问题是由我传递给视图的模型引起的，但我真的不知道，如何正确传递...任何人可以帮忙吗？
答案 0 :(得分：0)
你应该使用
([Bind(Prefix="prefixhere")]Category category)
我认为您的前缀应为CategoryCreate类别，您的模型ExpenseCreateViewModel的扩展名与您的CreateExpense相同，您的前缀应为ExpenseCreate，这样您就可以告诉控制器期望您的输入名称在此前缀之后，因此它将在您传递的前缀后的创建类别操作中查找CategoryID and Name。
像这样的东西
([Bind(Prefix="CategoryCreate")]Category category)
([Bind(Prefix="ExpenseCreate")]Expense expense)