当我提交表单并且数据库中的表当前为空时，我在Model.Any（）行上收到“ system.argumentnullexception”。视图的代码如下。
@using System.Linq
@model IEnumerable<Al_sehrawi.Models.tbl_Packing>
@{
ViewBag.Title = "AddBox2";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>AddBox2</h2>
@{
if (Model.Any())
{
foreach (var i in Model)
{
<form action="~/Packing/AddBox2" method="post">
<table>
<tr>
<td>
Id:
@{int counter = i.packing_id + 1;}
<input name="id" type="number" value="@counter" />
</td>
</tr>
<tr>
<td>
Name :
</td>
<td>
<input name="packingName" type="text" />
</td>
</tr>
<tr>
<td>
Unit :
</td>
<td>
<input name="unit" type="text" />
</td>
</tr>
<tr>
<td>
Quantity of 1st Packing :
</td>
<td>
<input name="quantity1" type="number" />
</td>
</tr>
<tr>
<tr>
<td>
Quantity of 2nd Packing :
</td>
<td>
<input name="quantity2" type="number" />
</td>
</tr>
<tr>
<td>
<input name="Submit1" type="submit" value="submit" />
</td>
</tr>
</table>
</form>
}
}
else
{
<form action="~/Packing/AddBox2" method="post">
<table>
<tr>
<td>
Id:
<input name="id" type="number" value="1" />
</td>
</tr>
<tr>
<td>
Name :
</td>
<td>
<input name="packingName" type="text" />
</td>
</tr>
<tr>
<td>
Unit :
</td>
<td>
<input name="unit" type="text" />
</td>
</tr>
<tr>
<td>
Quantity of 1st Packing :
</td>
<td>
<input name="quantity1" type="number" />
</td>
</tr>
<tr>
<tr>
<td>
Quantity of 2nd Packing :
</td>
<td>
<input name="quantity2" type="number" />
</td>
</tr>
<tr>
<td>
<input id="Submit1" type="submit" value="submit" />
</td>
</tr>
</table>
</form>
}
}
PackingController中的代码如下。
public ActionResult AddBox2()
{
PackingModel c = new PackingModel();
var id = c.getNextId();
return View(id);
}
[HttpPost]
public ActionResult AddBox2(int id, string packingName, string unit, int quantity1, int quantity2)
{
PackingModel p = new PackingModel();
p.addBox2(id, packingName, unit, quantity1, quantity2);
return View();
}
而模型是
public bool addBox2(int id, string packingName, string unit,int quantity1, int quantity2)
{
try
{
using (POSEntities1 db = new POSEntities1())
{
tbl_Packing p = new tbl_Packing();
tbl_packing_box2a b1 = new tbl_packing_box2a();
tbl_packing_box2b b2 = new tbl_packing_box2b();
p.name = packingName;
p.unit = unit;
b1.quantiity = quantity1;
b1.tbl_packing_box_id = id;
int a_Id;
var result = db.tbl_packing_box2a.OrderByDescending(b => b.tbl_packing_box1a_id).Take(1).ToList();
foreach (var item in result)
{
a_Id = item.tbl_packing_box1a_id;
b2.quantity = quantity2;
b2.tbl_packing_box2a_id = a_Id;
db.tbl_Packing.Add(p);
db.tbl_packing_box2a.Add(b1);
db.tbl_packing_box2b.Add(b2);
db.SaveChanges();
}
}
}
catch (Exception)
{
return false;
}
return true;
}
首先检查模型是否为空，然后尝试Model.Any（）
@if (Model != null)
{
if (Model.Any())
{
....
}
}
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