.NET Core/MVC-视图将空模型发布回控制器 [英] .NET Core/MVC - View Posting Null Model Back to Controller
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问题描述
我正在使用C#/.Net Core和MongoDB.我的编辑操作采用一个包含字符串值列表的模型,然后需要编辑该列表中的每个值.但是,当我调用编辑(提交)操作时,我的模型为null或返回一个空列表.
I'm using C#/.Net Core and MongoDB. My edit action takes in a model that contains a list of string values and then needs to edit each value in that list. However, when I call the edit (submit) action, my model is null or returns an empty list.
编辑获取:
[HttpGet]
public IActionResult EditUser(string userId)
{
if (userId == null)
return NotFound();
var user = _mongoService.RecordLookup(userId);
if (user == null)
return NotFound();
var viewModel = new EditRecordViewModel { Records = user };
return View(viewModel);
}
编辑帖子:
[HttpPost]
public IActionResult EditUser(EditRecordViewModel model)
{
try
{
foreach (var rec in model.Records)
{
var id = rec.Id;
var filter = Builders<RecordModel>.Filter.Eq("Id", id);
var modified = rec.Modified_At;
modified = DateTime.Now;
var updater = Builders<RecordModel>.Update.Set("Modified_At", modified);
var val = rec.Value;
updater = updater.Set("Value", val);
_mongoService.EditRecord(filter, updater);
}
}
catch(Exception ex)
{
throw ex;
}
return RedirectToAction("Index");
}
查看:
@model EditRecordViewModel
@using (Html.BeginForm("EditUser", "Grid", FormMethod.Post))
{
<div class="card">
<div class="card-body px-lg-5 pt-0 list-group-flush form-horizontal">
<div class="row list-group-item form-control">
@foreach (var rec in Model.Records)
{
@rec.ColumnName @Html.TextBoxFor(m => rec.Value, new { @class = "form-control" })
}
</div>
</div>
<div class="row list-group-item form-control">
<div class="col-md-12">
<input type="submit" class="btn btn-outline-success btn-rounded"
value="Save Edits" />
@Html.ActionLink("Cancel", "Index", "Grid", null, new { @class="btn btn-outline-black btn-rounded" })
</div>
</div>
</div>
}
查看模型:
using System.Collections.Generic;
namespace Medhub_API.Data.Models
{
public class EditRecordViewModel
{
public List<RecordModel> Records { get; set; }
}
}
在这里我可能缺少一些基本的或简单的东西,但是非常感谢任何建议!
I might be missing something fundamental or easy here but any suggestions are very much appreciated!
推荐答案
foreach
是问题所在.使用 for
循环和集合的索引来获取要正确发布回控制器的值
The foreach
is the problem. Use a for
loop and the index of the collection to get the values to be properly posted back to the controller
例如
@model EditRecordViewModel
@using (Html.BeginForm("EditUser", "Grid", FormMethod.Post)) {
<div class="card">
<div class="card-body px-lg-5 pt-0 list-group-flush form-horizontal">
<div class="row list-group-item form-control">
@for(var i = 0; i < Model.Records.Count; i++) {
@Model.Records[i].ColumnName @Html.TextBoxFor(m => m.Records[i].Value, new { @class = "form-control" })
}
</div>
</div>
</div>
<div class="row list-group-item form-control">
<div class="col-md-12">
<input type="submit" class="btn btn-outline-success btn-rounded"
value="Save Edits" />
@Html.ActionLink("Cancel", "Index", "Grid", null, new { @class="btn btn-outline-black btn-rounded" })
</div>
</div>
}
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