我知道这个问题被多次提出并回答，但遗憾的是没有一个答案对我有帮助。
我有树POCO模型，它们是药房，地址和公司聚集在一起的ViewModel PharmacyVM：
public class PharmacyVM
{
public Pharmacy pharmacyProp { get; set; }
public Address addressProp { get; set; }
public Company companyProp { get; set; }
public int CityId { get; set; }
public PharmacyVM()
{
pharmacyProp = new Pharmacy();
addressProp = new Address();
companyProp = new Company();
}
}
在Create方法的Get操作中，我尝试手动创建PharmacyVM对象并将其传递给视图：
public ActionResult Create()
{
ViewBag.CityId = new SelectList(db.Cities, "Id", "Name");
ViewBag.CompanyId = new SelectList(db.Companies, "Id", "Name");
ViewBag.AddressId = new SelectList(db.Addresses, "Id", "Name");
ViewBag.CityId = new SelectList(db.Cities, "Id", "Name");
ViewBag.RegionId = new SelectList(db.Regions, "Id", "Name");
ViewBag.DistrictId = new SelectList(db.Districts, "Id", "Name");
ViewBag.MicrodistrictId = new SelectList(db.Microdistricts, "Id", "Name");
ViewBag.StreetId = new SelectList(db.Streets, "Id", "Name");
ViewBag.VillageId = new SelectList(db.Villages, "Id", "Name");
var pharmacyVM = new PharmacyVM();
return View(pharmacyVM);
}
视图中有一个标准的Razor代码：
@model MEDONET.Models.PharmacyVM
@{
ViewBag.Title = "Create";
}
<h2>Create</h2>
@using (Html.BeginForm("Create", "Pharmacies", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>pharmacyProp</h4>
<hr />
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
<div class="form-group">
@Html.LabelFor(model => model.companyProp, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("CompanyId", null, "", htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.companyProp.Id, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.pharmacyProp.Name, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.pharmacyProp.Name, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.pharmacyProp.Name, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.addressProp.City, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("CityId", null, "", htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.CityId, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.CityId, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("CityId", null, "", htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.CityId, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.addressProp.Village, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("VillageId", null, "", htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.addressProp.VillageId, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.addressProp.District, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("DistrictId", null, "", htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.addressProp.DistrictId, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.HiddenFor(model => model.addressProp.RegionId)
@Html.LabelFor(model => model.addressProp.Region, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("RegionId", null, "", htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.addressProp.RegionId, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.addressProp.Microdistrict, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("MicrodistrictId", null, "", htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.addressProp.MicrodistrictId, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.addressProp.Building, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.addressProp.Building, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.addressProp.Building, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.addressProp.Street, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("MicrodistrictId", null, "", htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.addressProp.MicrodistrictId, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.pharmacyProp.IsGov, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
<div class="checkbox">
@Html.EditorFor(model => model.pharmacyProp.IsGov)
@Html.ValidationMessageFor(model => model.pharmacyProp.IsGov, "", new { @class = "text-danger" })
</div>
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.companyProp, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("companyId", null, "", htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.pharmacyProp.CompanyId, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.pharmacyProp.LargeImage, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
<input type="file" name="LargeImageFile" required />
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</div>
</div>
}
<div> @Html.ActionLink("Back to List", "Index")</div>
@section Scripts {
@Scripts.Render("~/bundles/jqueryval")
}
然后在Create方法的Post动作中，我尝试创建b和c变量：
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(PharmacyVM model, HttpPostedFileBase LargeImageFile)
{
if (ModelState.IsValid)
{
string LargeImageFileName = Path.GetFileNameWithoutExtension(LargeImageFile.FileName);
string LargeImageExtansion = Path.GetExtension(LargeImageFile.FileName);
LargeImageFileName = LargeImageFileName + DateTime.Now.ToString("yymmssfff") + LargeImageExtansion;
LargeImageFileName = Path.Combine(Server.MapPath("~/Images/Pharmacy/Banners/"), LargeImageFileName);
int b = model.CityId;
int c = model.addressProp.RegionId.Value;
//Address address = new Address()
//{
// Id = 12,//db.Addresses.AsEnumerable().Last().Id + 1,
// RegionId = PharmacyVM.Address.RegionId,
// DistrictId = PharmacyVM.Address.DistrictId,
// CityId = PharmacyVM.Address.CityId,
// MicrodistrictId = PharmacyVM.Address.MicrodistrictId,
// StreetId = PharmacyVM.Address.StreetId,
// VillageId = PharmacyVM.Address.VillageId,
// Building = PharmacyVM.Address.Building,
// Cab = PharmacyVM.Address.Cab
//};
//Address address = new Address
//{
// Id = 12,//db.Addresses.AsEnumerable().Last().Id + 1,
// RegionId = 1,
// DistrictId = 1,
// CityId = 1,
// MicrodistrictId = 1,
// StreetId = 1,
// VillageId = 1,
// Building = "1",
// Cab = "1"
//};
//db.Addresses.Add(address);
db.SaveChanges();
var pharmacy = new Pharmacy
{
Name = model.pharmacyProp.Name,
//AddressId = address.Id,
IsGov = model.pharmacyProp.IsGov,
CompanyId = model.pharmacyProp.CompanyId,
LargeImage = "~/Images/Pharmacy/Banners/" + LargeImageFileName
};
LargeImageFile.SaveAs(LargeImageFileName);
db.Pharmacies.Add(pharmacy);
db.SaveChanges();
ModelState.Clear();
return RedirectToAction("Index");
}
}
与第一个变量b不同，第二个变量c将 null ，因为addressProp属性为 null 。
那为什么这么奇怪？如何在不复制原始模型字段的情况下使用ViewModel？
答案 0 :(得分：0)
你为什么要用
SELECT count(`P_no`) AS `ab1` FROM
`scan_1`,`scan_2`,`scan_3` WHERE
((`scan_1`.`work`= 'YES') OR
(`scan_2`.`work`= 'YES') OR
(`scan_3`.`work`= 'YES'))
而不是
int b= model.addressProp.RegionId.Value
即使你的好词，最好的方法是删除所有的View包和 将所有View bag属性添加到PharmacyVM Class 不要使用两个属性进行视图绑定
示例
int b=model.addressProp.RegionId