foreach 循环 MVC 中的表单

Question

我遇到 MVC 控制器已发送记录列表的情况。这些记录显示在视图中，以便每条记录都是一个表格，因此可以逐条记录发布。

@model IList<FMS.Application.Models.TransferLineUpdateResponse>

@{
    ViewData["Title"] = "Transfer Lines Page";
}
<div class="row">
    <div class="col-12">

        @foreach (var item in Model)
        {
            <form method="post" class="form-inline">
                <div class="form-group">
                    <input type="hidden" asp-for="@item.Id" readonly class="form-control" />
                    <input type="hidden" asp-for="@item.TransferHeaderId" readonly class="form-control" />
                </div>
                <div class="form-group">
                    <label asp-for="@item.Item"></label>
                    <input asp-for="@item.Item" readonly class="form-control" />
                </div>
                <div class="form-group">
                    <label asp-for="@item.ToLocationId"></label>
                    <select class="form-control" asp-for="@item.ToLocationId" asp-items="ViewBag.ToLocations"></select>
                </div>
                <div class="form-group">
                    <input type="submit" asp-route-status="Accepted" class="btn btn-success" /> |
                    <input type="submit" asp-route-status="Rejected" class="btn btn-danger" />
                </div>
            </form>

        }
    </div>
</div>

当单击两个按钮之一并调用表单提交时，作为控制器中的参数，我的所有记录（如 Id、ToLocationId）都是 null 或空 guid，以防属性具有类型 guid。为什么不获取实际已更改的数据？问候

P.S.here是controller的代码

[HttpGet("Transfer/Details/{id}")]
public async Task<IActionResult> Details(Guid id)
{
    var lines = await _transferLineService.GetTransferLines(id);
    var locations = await _locationService.GetLocations();
    var customLocations = locations
        .Where(w=>w.Code != "Tranzit")
        .Select(s => new
    {
        Id = s.Id,
        Description = $"{s.Code} - {s.Description}"
    });
    ViewBag.ToLocations = new SelectList(customLocations, "Id", "Description");
    return View(lines);
}

[HttpPost("Transfer/Details/{transferHeaderId}")]
public async Task<IActionResult> AcceptDetails(Guid transferHeaderId, TransferLineUpdateResponse update)
{
    var result = await _transferLineService.UpdateTransferLine(update);
    await _transferHeaderService.UpdateTransferHeaderStatus(update.TransferHeaderId);
    return RedirectToAction("Details",new { transferHeaderId = update.TransferHeaderId });
}

Answer 1

Why it is not taken data which has been actually changed in view ?

模型绑定在源中查找名称模式 prefix.property_name。如果没有找到，它只查找 property_name 而没有 prefix.In 你的代码，asp-for 标签助手将生成如下名称：item.propertyName。它无法与后端匹配model.You 可以使用 [Bind(Prefix ="item")] 指定前缀。

更改如下：

[HttpPost("Transfer/Details/{transferHeaderId}")]
public async Task<IActionResult> AcceptDetails(Guid transferHeaderId,[Bind(Prefix ="item")] TransferLineUpdateResponse update)
{
    //do your stuff...
    //_context.Update(update);
    //await _context.SaveChangesAsync();

    //your get method used [HttpGet("Transfer/Details/{id}")]
    //so,it should be id not transferHeaderId
    return RedirectToAction("Details", new { id = update.TransferHeaderId });//also change here...
}

结果：

foreach 循环 MVC 中的表单

Forms inside foreach loop MVC

model-view-controller

asp.net-core-mvc