在MVC中为嵌套集合添加更多项目？ [英] Adding more items to nested collections in MVC?
问题描述
我有2个模型， employees1 和 phone_manager 。 Employees1 具有名为 employee_phone_manager 的ICollection，其中包含具有匹配员工ID的所有行。
I have 2 models, employees1 and phone_manager. Employees1 has an ICollection called employee_phone_manager that contains all the rows with the matching employee ID.
关注在线教程，我将两个模型集成在一起，以便我可以从我的创建视图中动态添加和删除项目。在我的编辑视图中，我可以编辑或删除电话号码，但不能添加。我发现的第一件事是，员工ID没有填充在动态添加的项目上，所以我修改了HTML帮助器来插入正确的员工ID，这就纠正了我对外键约束和引用完整性约束的一个问题。但是，它似乎并没有将项目插入到集合中。
Following a tutorial online, I integrated the two models together so that I could dynamically add and delete items from my create view. Inside my edit view, I can edit or delete phone numbers, but not add. The first thing I discovered was that the employee ID wasn't populating on the dynamically added items, so I modified the HTML helper to insert the proper employee ID, and this corrected an issue I was getting about foreign key constraints and referential integrity constraints. However, it appears that it doesn't actually insert the item into the collection.
这是我的编辑控制器的邮政编码：
Here is my post code for my edit controller:
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit([Bind(Include = "employee_id,assigned_id,all_id,first_name,last_name,birth_day,gender,social,address_line_1,address_line_2,city,state,zip,hire_date,termination_date,emergency_contact_name,emergency_contact_phone,notes,employee_phone_manager")] employees1 employees1)
{
if (ModelState.IsValid)
{
db.Entry(employees1).State = EntityState.Modified;
db.SaveChanges();
foreach (var item in employees1.employee_phone_manager)
{
if (item.phone_id == 0 && !item.deleted)
{
db.phone_manager.Add(item);
}
else if (item.phone_id != 0)
{
db.Entry(item).State = EntityState.Modified;
db.SaveChanges();
}
}
return RedirectToAction("Index");
}
ViewBag.phonetype = new SelectList(db.phone_types, "phone_type_id", "phone_type_name");
ViewBag.all_id = new SelectList(db.all_employees, "all_id", "all_id", employees1.all_id);
return View(employees1);
}
而我的视图
<div class="box border blue">
<div class="box-title">
<h4><i class="fa fa-phone"></i>Phone Number</h4>
<div class="tools">
<a href="javascript:;" class="collapse">
<i class="fa fa-chevron-up"></i>
</a>
@Html.RemoveLink("<i class=\"fa fa-times\"></i>", "div.phoneNumber", "input.mark-for-delete")
</div>
</div>
<div class="box-body">
@Html.HiddenFor(x => x.phone_id)
@Html.HiddenFor(x => x.employee_id)
<div class="form-group">
@Html.LabelFor(x => x.phone_type, new { @class = "control-label col-md-3" })
@Html.DropDownListFor(x => x.phone_type, (SelectList)ViewBag.phonetype, new { @class = "form-control" })
</div>
<div class="form-group">
@Html.LabelFor(x => x.phone_number, new { @class = "control-label col-md-3" })
@Html.TextBoxFor(x => x.phone_number, new { @class = "phone form-control", size = "10" })
</div>
<div class="form-group">
@Html.LabelFor(x => x.phone_extension, new { @class = "control-label col-md-3" })
@Html.TextBoxFor(x => x.phone_extension, new { size = "4", @class = "form-control" })
</div>
@Html.HiddenFor(x => x.date_added, new { @Value = System.DateTime.Now })
@Html.HiddenFor(x => x.deleted, new { @class = "mark-for-delete" })
</div>
</div>
和HTML帮助器
public static IHtmlString AddLink<TModel>(this HtmlHelper<TModel> htmlHelper, string linkText, string containerElement, string counterElement, string collectionProperty, Type nestedType, string empID = "0")
{
var ticks = DateTime.UtcNow.Ticks;
var nestedObject = Activator.CreateInstance(nestedType);
var partial = htmlHelper.EditorFor(x => nestedObject).ToHtmlString().JsEncode();
partial = partial.Replace("id=\\\"nestedObject", "id=\\\"" + collectionProperty + "_" + ticks + "_");
partial = partial.Replace("id=\\\"nestedObject", "id=\\\"" + collectionProperty + "_" + ticks + "_");
partial = partial.Replace(".employee_id\\\" type=\\\"hidden\\\" value=\\\"0", ".employee_id\\\" type=\\\"hidden\\\" value=\\\"" + empID);
var js = string.Format("javascript:addNestedForm('{0}','{1}','{2}','{3}');return false;", containerElement, counterElement, ticks, partial);
TagBuilder tb = new TagBuilder("a");
tb.Attributes.Add("href", "#");
tb.Attributes.Add("onclick", js + ";addMasks();");
tb.Attributes.Add("class", "addNewItemsLink");
tb.InnerHtml = linkText;
var tag = tb.ToString(TagRenderMode.Normal);
return MvcHtmlString.Create(tag);
}
private static string JsEncode(this string s)
{
if (string.IsNullOrEmpty(s)) return "";
int i;
int len = s.Length;
StringBuilder sb = new StringBuilder(len + 4);
string t;
for (i = 0; i < len; i += 1)
{
char c = s[i];
switch (c)
{
case '>':
case '"':
case '\\':
sb.Append('\\');
sb.Append(c);
break;
case '\b':
sb.Append("\\b");
break;
case '\t':
sb.Append("\\t");
break;
case '\n':
break;
case '\f':
sb.Append("\\f");
break;
case '\r':
break;
default:
if (c < ' ')
{
string tmp = new string(c, 1);
t = "000" + int.Parse(tmp, System.Globalization.NumberStyles.HexNumber);
sb.Append("\\u" + t.Substring(t.Length - 4));
}
else
{
sb.Append(c);
}
break;
}
}
return sb.ToString();
}
}
任何帮助都非常感谢！谢谢！
Any help is greatly appreciated! Thanks!
推荐答案
经过几个小时的修补，我终于想出了我做错了什么！原来我真的应该阅读一些文档。 EntityState 有几个不同的属性，其中一些是修改，添加和已删除。通过表示这些状态之一，我可以直接从编辑方法插入和删除。
After a few hours of tinkering, I finally figured out what I was doing wrong! It turns out I really should read some documentation. EntityState has several different properties, some of which are Modified, Added, and Deleted. By denoting one of these states I can insert and delete directly from the edit method.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(employees1 employees1)
{
if (ModelState.IsValid)
{
foreach (var item in employees1.employee_phone_manager)
{
if (item.deleted)
{
db.Entry(item).State = EntityState.Deleted;
}
else if (item.phone_id == 0)
{
db.Entry(item).State = EntityState.Added;
}
else
{
db.Entry(item).State = EntityState.Modified;
}
db.SaveChanges();
}
db.Entry(employees1).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.phonetype = new SelectList(db.phone_types, "phone_type_id", "phone_type_name");
ViewBag.all_id = new SelectList(db.all_employees, "all_id", "all_id", employees1.all_id);
return View(employees1);
}
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