我有一个视图,用户应在其中通过复选框选择多个列出的项目,然后应在控制器中进行操作。
但是,我没有将值传递给控制器的POST方法;调试时,列表为空。
在搜索答案时,我找不到与C#匹配的一个,而Html.CheckboxFor
则找不到多个值。
我觉得这可能只是个小问题,但现在我几天都无法解决。
这是我的模特:
public class ShownListofTools// This List is given to the View to contain all Tools
{
public IEnumerable<CheckboxItem> ToolsInShownList { get; set; } = new List<CheckboxItem>();
}
public class CheckboxItem //This Model is used to bring the Tools to the View
{
public int ShownToolID { get; set; }
public bool IsChecked { get; set; }
public string DisplayName { get; set; }
public int RemainingWorkTime { get; set; }
}
这是控制器:
[HttpGet]
public ActionResult IndexforLend()
{
// 1)
var notwornouttools = db.Tools.Where(t => t.Max_Worktime - t.CurrentWorktime > 0); // List Tools that are not worn out yet
var tools = notwornouttools.Where(t => t.UserID == null); //refine Filter to all tools that are currently not lent by other users
// 2)
List<CheckboxItem> SelectListTools = new List<CheckboxItem>(); //temporary list, to gather all needed items
// 3)
foreach(var item in tools)//work down the "tool" list from above
{
SelectListTools.Add(
new CheckboxItem()//Add a new Checkbox Item
{
DisplayName = item.Tooltype + " " + item.Diameter+"mm", //Transfer the Attributes from the "tool" list
ShownToolID = item.ID,
IsChecked = false,
RemainingWorkTime = item.Max_Worktime - item.CurrentWorktime,
}
);
}
//Checkboxlist.ToolsInShownList = SelectListTools; //The Checkbox Items are Added to the List "Checkboxlist".
return View(SelectListTools); // The List "Checkboxlist" is transferred to the View.
}
//POST: Add Tools to a User
[HttpPost]
public ActionResult IndexforLend([Bind(Include = "IsChecked,ShownToolID")] List<CheckboxItem> chklist) //import from View, but make it numerable
{
foreach(var item in chklist) //go through the entire Checkboxlist
{
if (item.IsChecked == true) // if the Checkbox was Checked - not sure if only checked objects are returned
{
var id = item.ShownToolID; // take the Tool-ID to the variable "id"
foreach(var realtool in db.Tools) //go through all Tools in Database
{
if (realtool.ID == id) // if the Id from the Checkbox is found
{
realtool.UserID = LoggedInUser.ID; // set the Foreign Key UserID to the ID of the Logged in User
db.Entry(realtool).State = EntityState.Modified;
db.SaveChanges();
}
}
};
}
return RedirectToAction("Index");
}
视图:
@model List<WZ_Web2.Models.CheckboxItem>
<p></p>
<p></p>
<div>Please select the Tools you want to lend:</div>
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<table class="table">
@**@
<tr>
<th>
Select
</th>
<th>
Tool Name
</th>
<th>
Remaining Work Time
</th>
</tr>
@foreach (var item in Model)
{
<tr>
<td>
@Html.CheckBoxFor(modelItem => item.IsChecked)
@Html.HiddenFor(modelItem => item.ShownToolID)
</td>
<td>
@Html.DisplayFor(modelItem => item.DisplayName)
</td>
<td>
@Html.DisplayFor(modelItem => item.RemainingWorkTime)
</td>
</tr>
}
</table>
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="submit" class="btn btn-default" />
</div>
}
以这种方式使用foreach
,不会在帖子中生成带索引的姓名列表。当您通过item
进行迭代并设置modelItem
时,它会在帖子中生成如下内容:
item.IsChecked = true&item.ShownToolID = 1&item.IsChecked = false ...
但是控制器期望一个数组列表,例如:
model [0] .IsChecked = true&model [0] .ShownToolID = 1&model [1] .IsChecked = false ...
尝试改用for
。
您认为:
@for (int i = 0; i < Model.Count; i++ )
{
<tr>
<td>
@Html.CheckBoxFor(item => Model[i].IsChecked)
@Html.HiddenFor(item => Model[i].ShownToolID)
</td>
<td>
@Html.DisplayFor(item => Model[i].DisplayName)
</td>
<td>
@Html.DisplayFor(item => Model[i].RemainingWorkTime)
</td>
</tr>
}
在您的控制器中:
[HttpPost]
public ActionResult IndexforLend(List<CheckboxItem> chklist)