问题描述
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.
I have a view where the user should select several listed items by checkboxes, which should then be worked within the controller.
但是,我没有将值传递给控制器的POST方法.调试时,列表为空.
However, I am not getting the values passed to the POST method of the controller; the List comes in null when debugging.
在寻找答案时,我找不到与C#和Html.CheckboxFor
匹配的多个值.
While searching for answers, I was not able to find one matching with C# and the Html.CheckboxFor
for multiple values.
我觉得这可能只是个小问题,但是现在几天我都无法解决.
I feel that this may be just a minor thing to fix, but I cannot figure it out for several days now.
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>
}
推荐答案
使用foreach
这样,它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:
Using foreach
that way it's not generating indexed name list in the post. As you iterate by item
and set modelItem
, it generates something like this in the post:
但是控制器期望索引列表,例如:
But the controller is expecting an indexed list e.g.:
结果,映射器无法绑定帖子中的数据.我已经检查了一下帖子.尝试改用for
...
As a result, mapper is unable to bind the data in your post. I've figured out by inspecting the post. Try using for
instead...
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)
这篇关于将Html.CheckBoxFor的多个复选框值返回给控制器的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!