了解可枚举和的ViewModels [英] Understanding Enumerables and ViewModels
问题描述
我想学习ASP.NET MVC（C＃），和我目前正在处理的ViewModels。我理解的ViewModels的目的，我可以用他们通过在屏幕上获取数据，但我具有理解与他们的关系的困难 - 我的另一个新元素 - 接口
I am trying to learn ASP.NET MVC (C#), and am currently tackling ViewModels. I understand the purpose of ViewModels, and I can get data through to the screen using them, but am having difficulties with understanding their relationship with - another new element for me - interfaces.
我想达到以下几种观点：
I want to achieve the following View:
你可以看到我有一个简单的初始插入表单添加新的工作人员，与问候下拉。在此之后，有一个编辑的第二种形式，我通过现有的工作人员进行迭代，将它们的值到相应的输入栏，在这里称呼下拉列表默认为它们的相对称呼。
You can see I have a simple initial insert form for adding a new staff member, with a dropdown for salutations. Following this, there is a second form for editing where I iterate through available staff members, placing their values into relevant input fields, where the salutation dropdown defaults to their relative salutation.
我有两个领域模型/桌， Prm_Staff 和 Prm_Salutation ，其中我访问（打错字了，我想）通过视图模型Staff_VM：
I have two Domain Models / tables, Prm_Staff and Prm_Salutation, which I am accessing (wrong word, I think) via the ViewModel Staff_VM:
public class Staff_VM
{
public int StaffID { get; set; }
public int SalutationID { get; set; }
public string FName { get; set; }
public string LName { get; set; }
public bool Active { get; set; }
public List<Prm_Salutation> AvailableSalutations { get; set; }
}
public class StaffMembers
{
public Staff_VM StaffVm;
public IEnumerable<Staff_VM> ListStaffVms;
}
在我的控制器：
var activeSalts = (from a in db.Prm_Salutations
where a.Active == true
orderby a.Desc ascending
select a).ToList();
var model = new StaffMembers
{
ListStaffVms = (from a in db.Prm_Staffs
where a.Active == true
orderby a.LName ascending
select new Staff_VM
{
StaffID = a.Prm_StaffID,
SalutationID = a.SalutationID,
FName = a.FName,
LName = a.LName,
Active = a.Active,
AvailableSalutations = activeSalts
}),
StaffVm = new Staff_VM()
{
AvailableSalutations = activeSalts
},
};
return View("StaffMembers", model);
在视图中，我指的是模型 @model November.ViewModels.StaffMembers ：
In the View, I refer to that model @model November.ViewModels.StaffMembers:
@*Record New Staff Member*@
<tr>
<td>
@Html.DropDownListFor(
model => model.StaffVm.SalutationID,
Model.StaffVm.AvailableSalutations.Select(option => new SelectListItem
{
Text = option.Desc.ToString(),
Value = option.Prm_SalutationID.ToString()
}
),
"Choose...")
</td>
<td>@Html.EditorFor(model => model.StaffVm.FName)</td>
<td>@Html.EditorFor(model => model.StaffVm.LName)</td>
<td>@Html.EditorFor(model => model.StaffVm.Active)</td>
</tr>
@*Update Existing Staff Members*@
@foreach (var staff in Model.ListStaffVms)
{
<tr>
<td>@Html.HiddenFor(model => staff.StaffID)@Html.ValueFor(model => staff.StaffID) </td>
<td>
@Html.DropDownListFor(
model => staff.SalutationID, staff.AvailableSalutations.Select(option => new SelectListItem
{
Selected = (option.Prm_SalutationID == staff.SalutationID),
Text = option.Desc.ToString(),
Value = option.Prm_SalutationID.ToString()
}
),
"Choose...")
</td>
<td>@Html.EditorFor(model => staff.FName)</td>
<td>@Html.EditorFor(model => staff.LName)</td>
<td>@Html.EditorFor(model => staff.Active)</td>
<td><a href="/Settings/DeleteStaff?id=@Html.ValueFor(model => staff.StaffID)">Delete</a></td>
</tr>
}
的ActionResult：
ActionResult:
public ActionResult UpdateStaff(StaffMembers list)
{
if (ModelState.IsValid)
{
foreach (var staffVm in list.ListStaffVms)
{
Prm_Staff staff = db.Prm_Staffs.Find(staffVm.StaffID);
staff.SalutationID = staffVm.SalutationID;
staff.FName = staffVm.FName;
staff.LName = staffVm.LName;
staff.Active = staffVm.Active;
}
db.SaveChanges();
ViewBag.rtrn = "Successfully Updated.";
return RedirectToAction("Parameters", new { param = "Staff Members", rtrn = ViewBag.rtrn });
}
else
{
ViewBag.rtrn = "Failed ! Please try again.";
return RedirectToAction("Parameters", new { param = "Staff Members", rtrn = ViewBag.rtrn });
}
}
编辑：更新，以显示最新的更改
Updated to show most recent changes
推荐答案
我想你应该考虑改变你的视图模型。还做这样的事情如下：
I think you should consider change your ViewModel. Also do something like below:
视图模型
public class Staff_VM
{
public int ID { get; set; }
public int SalutationID { get; set; }
public string FName { get; set; }
public string LName { get; set; }
public bool Active { get; set; }
}
public class MyViewModel
{
public Staff_VM StaffVm { get; set; }
public List<Staff_VM> ListStaffVms { get; set; }
public List<Prm_Salutation> AvailableSalutations { get; set; }
}
Add_Update_Staff动作
[HttpGet]
public ActionResult Add_Update_Staff()
{
var model = new MyViewModel
{
ListStaffVms = (from a in db.Prm_Staffs
where a.Active == true
orderby a.LName ascending
select new Staff_VM
{
ID = a.Id,
SalutationID = a.SalutationID,
FName = a.FName,
LName = a.LName,
Active = a.Active
}),
AvailableSalutations = (from p in db.Prm_Salutations
where a.Active == true
orderby p.Desc ascending
select p).ToList()
};
return View(model);
}
更新后的工作人员
[HttpPost]
public ActionResult Add_Update_Staff(MyViewModel model, string buttonType)
{
if (buttonType == "Insert")
{
if (ModelState.IsValid)
{
//save a new staff info
return RedirectToAction("Index", "Home");
}
}
if (buttonType == "Update")
{
foreach (var staffVm in model.ListStaffVms)
{
// update each record here
}
return RedirectToAction("Index", "Home");
}
model.AvailableSalutations = (from p in db.Prm_Salutations
orderby p.Desc ascending
select p).ToList();
return View(model);
}
查看
您可能需要添加验证插入和更新员工信息
You may need to add validation for insert and update staff info
@using (Html.BeginForm("Add_Update_Staff", "Staff"))
{
<tr>
<td>
@Html.DropDownListFor(
model => model.StaffVm.SalutationID, Model.AvailableSalutations.Select(option => new SelectListItem
{
Text = option.Desc.ToString(),
Value = option.Prm_SalutationID.ToString()
}
), "Choose...")
</td>
<td>@Html.EditorFor(model => model.StaffVm.FName)</td>
<td>@Html.EditorFor(model => model.StaffVm.LName)</td>
<td>@Html.EditorFor(model => model.StaffVm.Active)</td>
</tr>
<input type="submit" value="Insert" name="buttonType" />
for (int i = 0; i < Model.ListStaffVms.Count(); i++)
{
<tr>
<td>@Html.HiddenFor(m => m.ListStaffVms[i].ID)@Html.ValueFor(m => m.ListStaffVms[i].ID) </td>
<td>
@Html.DropDownListFor(
m => m.ListStaffVms[i].SalutationID, Model.AvailableSalutations.Select(option => new SelectListItem
{
Selected = (option.Prm_SalutationID == Model.ListStaffVms[i].SalutationID),
Text = option.Desc.ToString(),
Value = option.Prm_SalutationID.ToString()
}), "Choose...")
</td>
<td>@Html.EditorFor(model => model.ListStaffVms[i].FName)</td>
<td>@Html.EditorFor(model => model.ListStaffVms[i].LName)</td>
<td>@Html.EditorFor(model => model.ListStaffVms[i].Active)</td>
<td><a href="/Settings/DeleteStaff?id=@Html.ValueFor(model => model.ListStaffVms[i].ID)">Delete</a></td>
<hr />
</tr>
}
<input type="submit" value="Update" name="buttonType" />
}
这篇关于了解可枚举和的ViewModels的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
