在开始执行此任务之前，我强烈建议您阅读 Steven Sanderson 的 Editing a variable length list, ASP.NET MVC 2-style。
准备好了吗？
好的，现在我们可以进入实现了。
第一件事是为任务定义我们的视图模型。已经有了，只要在上面定义相应的验证规则即可：
public class Person
{
[Required]
public string FullName { get; set; }
[Required]
public string LastName { get; set; }
[Required]
public string Address{ get; set; }
}
我想我的这个页面的模型应该是列表
是的，绝对的。
让我们继续创建我们的PersonsController：
public class PersonsController : Controller
{
public ActionResult Index()
{
var model = new[]
{
new Person()
};
return View(model);
}
[HttpPost]
public ActionResult Index(IEnumerable<Person> persons)
{
if (!ModelState.IsValid)
{
return View(persons);
}
// To do: do whatever you want with the data
// In this example I am simply dumping it to the output
// but normally here you would update your database or whatever
// and redirect to the next step of the wizard
return Content(string.Join(Environment.NewLine, persons.Select(p => string.Format("name: {0} address: {1}", p.FullName, p.Address))));
}
public ActionResult BlankEditorRow()
{
return PartialView("_PersonEditorRow", new Person());
}
}
现在让我们定义视图 (~/Views/Persons/Index.cshtml)：
@model IEnumerable<Person>
@using (Html.BeginForm())
{
<div id="editorRows">
@foreach (var item in Model)
{
Html.RenderPartial("_PersonEditorRow", item);
}
</div>
@Html.ActionLink(
"Add another person",
"BlankEditorRow",
null,
new { id = "addItem" }
)
<p>
<button type="submit">Next step</button>
</p>
}
<script type="text/javascript">
$('#addItem').click(function () {
$.ajax({
url: this.href,
cache: false,
success: function (html) { $('#editorRows').append(html); }
});
return false;
});
$(document).delegate('a.deleteRow', 'click', function () {
$(this).parents('div.editorRow:first').remove();
return false;
});
</script>
以及对应的局部视图（~/Views/Persons/_PersonEditorRow.cshtml）：
@model Person
<div class="editorRow">
@using(Html.BeginCollectionItem("persons"))
{
<div>
@Html.LabelFor(x => x.FullName)
@Html.EditorFor(x => x.FullName)
@Html.ValidationMessageFor(x => x.FullName)
</div>
<div>
@Html.LabelFor(x => x.LastName)
@Html.EditorFor(x => x.LastName)
@Html.ValidationMessageFor(x => x.LastName)
</div>
<div>
@Html.LabelFor(x => x.Address)
@Html.EditorFor(x => x.Address)
@Html.ValidationMessageFor(x => x.Address)
</div>
<a href="#" class="deleteRow">delete</a>
}
</div>
备注：此处使用的 Html.BeginCollectionItem 助手取自 Steven Sanderson 的博客文章，我之前在我的答案中链接到了该文章，您已经阅读并熟悉了该文章。以下是完整的源代码：
public static class HtmlPrefixScopeExtensions
{
private const string idsToReuseKey = "__htmlPrefixScopeExtensions_IdsToReuse_";
public static IDisposable BeginCollectionItem(this HtmlHelper html, string collectionName)
{
var idsToReuse = GetIdsToReuse(html.ViewContext.HttpContext, collectionName);
string itemIndex = idsToReuse.Count > 0 ? idsToReuse.Dequeue() : Guid.NewGuid().ToString();
// autocomplete="off" is needed to work around a very annoying Chrome behaviour whereby it reuses old values after the user clicks "Back", which causes the xyz.index and xyz[...] values to get out of sync.
html.ViewContext.Writer.WriteLine(string.Format("<input type=\"hidden\" name=\"{0}.index\" autocomplete=\"off\" value=\"{1}\" />", collectionName, html.Encode(itemIndex)));
return BeginHtmlFieldPrefixScope(html, string.Format("{0}[{1}]", collectionName, itemIndex));
}
public static IDisposable BeginHtmlFieldPrefixScope(this HtmlHelper html, string htmlFieldPrefix)
{
return new HtmlFieldPrefixScope(html.ViewData.TemplateInfo, htmlFieldPrefix);
}
private static Queue<string> GetIdsToReuse(HttpContextBase httpContext, string collectionName)
{
// We need to use the same sequence of IDs following a server-side validation failure,
// otherwise the framework won't render the validation error messages next to each item.
string key = idsToReuseKey + collectionName;
var queue = (Queue<string>)httpContext.Items[key];
if (queue == null)
{
httpContext.Items[key] = queue = new Queue<string>();
var previouslyUsedIds = httpContext.Request[collectionName + ".index"];
if (!string.IsNullOrEmpty(previouslyUsedIds))
foreach (string previouslyUsedId in previouslyUsedIds.Split(','))
queue.Enqueue(previouslyUsedId);
}
return queue;
}
private class HtmlFieldPrefixScope : IDisposable
{
private readonly TemplateInfo templateInfo;
private readonly string previousHtmlFieldPrefix;
public HtmlFieldPrefixScope(TemplateInfo templateInfo, string htmlFieldPrefix)
{
this.templateInfo = templateInfo;
previousHtmlFieldPrefix = templateInfo.HtmlFieldPrefix;
templateInfo.HtmlFieldPrefix = htmlFieldPrefix;
}
public void Dispose()
{
templateInfo.HtmlFieldPrefix = previousHtmlFieldPrefix;
}
}
}
更新：
我的错，我刚刚注意到您的问题标有asp.net-mvc-2。所以我想我的 Razor 观点不适用于你的情况。尽管如此，其他一切都应该是一样的。您需要做的就是更新视图，以便它们使用 WebForms 视图引擎：
这是~/Views/Persons/Index.aspx：
<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<IEnumerable<Person>>" %>
<% using (Html.BeginForm()) { %>
<div id="editorRows">
<% foreach (var item in Model) { %>
<% Html.RenderPartial("_PersonEditorRow", item); %>
<% } %>
</div>
<%= Html.ActionLink(
"Add another person",
"BlankEditorRow",
null,
new { id = "addItem" }
) %>
<p>
<button type="submit">Next step</button>
</p>
<% } %>
<script type="text/javascript">
$('#addItem').click(function () {
$.ajax({
url: this.href,
cache: false,
success: function (html) { $('#editorRows').append(html); }
});
return false;
});
$(document).delegate('a.deleteRow', 'click', function () {
$(this).parents('div.editorRow:first').remove();
return false;
});
</script>
最后是 (~/Views/Persons/_PersonEditorRow.ascx) 部分：
<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<Person>" %>
<div class="editorRow">
<% using(Html.BeginCollectionItem("persons")) { %>
<div>
<%= Html.LabelFor(x => x.FullName) %>
<%= Html.EditorFor(x => x.FullName) %>
<%= Html.ValidationMessageFor(x => x.FullName) %>
</div>
<div>
<%= Html.LabelFor(x => x.LastName) %>
<%= Html.EditorFor(x => x.LastName) %>
<%= Html.ValidationMessageFor(x => x.LastName) %>
</div>
<div>
<%= Html.LabelFor(x => x.Address) %>
<%= Html.EditorFor(x => x.Address) %>
<%= Html.ValidationMessageFor(x => x.Address) %>
</div>
<a href="#" class="deleteRow">delete</a>
<% } %>
</div>