经过大量研究，我找到了两种解决方案：
- 一种是编写具有硬编码 ID 和名称的 HTML
- 两种方法是将 ICollection/IEnumerable 转换为数组或列表（即 IList 具有“索引”的内容），并在控制器 POST 操作的 BindingModel 中拥有一个数组对象。
感谢 Phil Haack (@haacked) 2008 年的博客文章http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx/ http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx/这仍然与当今 MVC 的默认 Model Binder 的工作方式相关。
（注意：Phil 文章中示例项目和扩展方法的链接已损坏）
给我启发的 HTML 片段：
<form method="post" action="/Home/Create">
<input type="hidden" name="products.Index" value="cold" />
<input type="text" name="products[cold].Name" value="Beer" />
<input type="text" name="products[cold].Price" value="7.32" />
<input type="hidden" name="products.Index" value="123" />
<input type="text" name="products[123].Name" value="Chips" />
<input type="text" name="products[123].Price" value="2.23" />
<input type="submit" />
</form>
后数组看起来有点像：
products.Index=cold&products[cold].Name=Beer&products[cold].Price=7.32&products.Index=123&products[123].Name=Chips&products[123].Price=2.23
Model:
public class CreditorViewModel
{
public CreditorViewModel()
{
this.Claims = new HashSet<CreditorClaimViewModel>();
}
[Key]
public int CreditorId { get; set; }
public string Comments { get; set; }
public ICollection<CreditorClaimViewModel> Claims { get; set; }
public CreditorClaimViewModel[] ClaimsArray {
get { return Claims.ToArray(); }
}
}
public class CreditorClaimViewModel
{
[Key]
public int CreditorClaimId { get; set; }
public string CreditorClaimType { get; set; }
[DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:N2}")]
public Decimal ClaimedTotalAmount { get; set; }
}
控制器获取：
public async Task<ActionResult> Edit(int id)
{
var testmodel = new CreditorViewModel
{
CreditorId = 1,
Comments = "test",
Claims = new HashSet<CreditorClaimViewModel>{
new CreditorClaimViewModel{ CreditorClaimId=1, CreditorClaimType="1", ClaimedTotalAmount=0.00M},
new CreditorClaimViewModel{ CreditorClaimId=2, CreditorClaimType="2", ClaimedTotalAmount=0.00M},
}
};
return View(model);
}
编辑.cshtml：
@Html.DisplayNameFor(m => m.Comments)
@Html.EditorFor(m => m.Comments)
<table class="table">
<tr>
<th>
@Html.DisplayNameFor(m => Model.Claims.FirstOrDefault().CreditorClaimType)
</th>
<th>
@Html.DisplayNameFor(m => Model.Claims.FirstOrDefault().ClaimedTotalAmount)
</th>
</tr>
<!--Option One-->
@foreach (var item in Model.Claims)
{
var fieldPrefix = string.Format("{0}[{1}].", "Claims", item.CreditorClaimId);
<tr>
<td>
@Html.DisplayFor(m => item.CreditorClaimType)
</td>
<td>
@Html.TextBox(fieldPrefix + "ClaimedTotalAmount", item.ClaimedTotalAmount.ToString("F"),
new
{
@class = "text-box single-line",
data_val = "true",
data_val_number = "The field ClaimedTotalAmount must be a number.",
data_val_required = "The ClaimedTotalAmount field is required."
})
@Html.Hidden(name: "Claims.index", value: item.CreditorClaimId, htmlAttributes: null)
@Html.Hidden(name: fieldPrefix + "CreditorClaimId", value: item.CreditorClaimId, htmlAttributes: null)
</td>
</tr>
}
</table>
<!--Option Two-->
@for (var itemCnt = 0; itemCnt < Model.ClaimsArray.Count(); itemCnt++)
{
<tr>
<td></td>
<td>
@Html.TextBoxFor(m => Model.ClaimsArray[itemCnt].ClaimedTotalAmount)
@Html.HiddenFor(m => Model.ClaimsArray[itemCnt].CreditorClaimId)
</td></tr>
}
表单在控制器中处理：
帖子型号：
public class CreditorPostViewModel
{
public int CreditorId { get; set; }
public string Comments { get; set; }
public ICollection<CreditorClaimPostViewModel> Claims { get; set; }
public CreditorClaimPostViewModel[] ClaimsArray { get; set; }
}
public class CreditorClaimPostViewModel
{
public int CreditorClaimId { get; set; }
public Decimal ClaimedTotalAmount { get; set; }
}
控制器：
[HttpPost]
public ActionResult Edit(int id, CreditorPostViewModel creditorVm)
{
//...
