Asp.net mvc 3 执行HttpPost以在数据库中存储选中的复选框值
我引用此内容是为了了解如何在数据库中发布Asp.net mvc 3 执行HttpPost以在数据库中存储选中的复选框值,asp.net-mvc-3,checkbox,checkboxlist,Asp.net Mvc 3,Checkbox,Checkboxlist,我引用此内容是为了了解如何在数据库中发布复选框所选值 但是,由于出现NullReferenceException(请参阅下面的快照),我无法在debug上获取所选的值 这是我的密码: 型号: public class ProductModel { public string ProductId { get; set; } public string ProductName { get; set; } public bool Selected { get; set; }
复选框
所选值
但是,由于出现NullReferenceException
(请参阅下面的快照),我无法在debug
上获取所选的值
这是我的密码:
型号:
public class ProductModel
{
public string ProductId { get; set; }
public string ProductName { get; set; }
public bool Selected { get; set; }
public string[] CheckedColumn { get; set; }
}
视图:
@model IEnumerable<DemoApp.Models.ViewModels.ProductModel>
@{
ViewBag.Title = "CheckView";
}
<table>
<tr>
<th>
ProductId
</th>
<th>
ProductName
</th>
<th>
Selected
</th>
<th></th>
</tr>
@foreach (var item in Model)
{
<tr>
<td>
@Html.DisplayFor(modelItem => item.ProductId)
</td>
<td>
@Html.DisplayFor(modelItem => item.ProductName)
</td>
<td>
@Html.CheckBoxFor(modelItem => item.Selected)
</td>
</tr>
}
</table>
@using (Html.BeginForm())
{
<div>
<input type="submit" name="AddResult" value="CheckView"/>
</div>
}
以下是我在运行项目时拍摄的一些快照
我的观点或控制者是否做错了什么?有人能帮我吗?您的模型为空,因为您没有从控制器操作传递任何内容。CheckView ActionMethod应该是生成视图的操作。然后,您的“CheckView”按钮应该调用另一个HttpPost操作,该操作看起来与您以前的CheckView类似。如果在评论中有帮助,请告诉我
用于视图的操作结果方法:
public ActionResult CheckView(ProductModel model)
{
return View("CheckView", model);
}
按钮单击的操作
[HttpPost]
public ActionResult TestView(FormCollection collection)
{
try
{
ProductModel model = new ProductModel();
// Get all the selected checkboxlist, do db insertion
model.CheckedColumn = collection["CheckView"].Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
return RedirectToAction("Index");
}
catch
{
return View();
}
}
鉴于这样的情况:
@using (@Html.BeginForm("TestView", "Controller Name"))
{
//all your input here
// submit button here
}
[HttpGet]
public ActionResult CheckView()
{
DatabaseEntities db = new DatabaseEntities();
var prodList = from b in db.SysUser3
select new ProductModel
{
ProductId = b.ProductId,
ProductName = b.ProductName,
Selected = b.SelectedProducts
};
var p = prodList.ToList();
return View(p);
}
[HttpPost]
public ActionResult CheckView(FormCollection collection)
{
try
{
ProductModel model = new ProductModel();
// Get all the selected checkboxlist, do db insertion
model.CheckedColumn = collection["CheckView"].Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
return RedirectToAction("Index");
}
catch
{
ModelState.addModelError("", "There was an issue processing the results.");
DatabaseEntities db = new DatabaseEntities();
var prodList = from b in db.SysUser3
select new ProductModel
{
ProductId = b.ProductId,
ProductName = b.ProductName,
Selected = b.SelectedProducts
};
return View(prodList.ToList());
}
}
您的模型为空,因为您没有从控制器操作传递任何内容。CheckView ActionMethod应该是生成视图的操作。然后,您的“CheckView”按钮应该调用另一个HttpPost操作,该操作看起来与您以前的CheckView类似。如果在评论中有帮助,请告诉我
用于视图的操作结果方法:
public ActionResult CheckView(ProductModel model)
{
return View("CheckView", model);
}
按钮单击的操作
[HttpPost]
public ActionResult TestView(FormCollection collection)
{
try
{
ProductModel model = new ProductModel();
// Get all the selected checkboxlist, do db insertion
model.CheckedColumn = collection["CheckView"].Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
return RedirectToAction("Index");
}
catch
{
return View();
}
}
鉴于这样的情况:
@using (@Html.BeginForm("TestView", "Controller Name"))
{
//all your input here
// submit button here
}
[HttpGet]
public ActionResult CheckView()
{
DatabaseEntities db = new DatabaseEntities();
var prodList = from b in db.SysUser3
select new ProductModel
{
ProductId = b.ProductId,
ProductName = b.ProductName,
Selected = b.SelectedProducts
};
var p = prodList.ToList();
return View(p);
}
[HttpPost]
public ActionResult CheckView(FormCollection collection)
{
try
{
ProductModel model = new ProductModel();
// Get all the selected checkboxlist, do db insertion
model.CheckedColumn = collection["CheckView"].Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
return RedirectToAction("Index");
}
catch
{
ModelState.addModelError("", "There was an issue processing the results.");
DatabaseEntities db = new DatabaseEntities();
var prodList = from b in db.SysUser3
select new ProductModel
{
ProductId = b.ProductId,
ProductName = b.ProductName,
Selected = b.SelectedProducts
};
return View(prodList.ToList());
}
}
我同意博贝克的观点。问题是您没有在post操作中重新初始化模型。大概是这样的:
@using (@Html.BeginForm("TestView", "Controller Name"))
{
//all your input here
// submit button here
}
[HttpGet]
public ActionResult CheckView()
{
DatabaseEntities db = new DatabaseEntities();
var prodList = from b in db.SysUser3
select new ProductModel
{
ProductId = b.ProductId,
ProductName = b.ProductName,
Selected = b.SelectedProducts
};
var p = prodList.ToList();
return View(p);
}
[HttpPost]
public ActionResult CheckView(FormCollection collection)
{
try
{
ProductModel model = new ProductModel();
// Get all the selected checkboxlist, do db insertion
model.CheckedColumn = collection["CheckView"].Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
return RedirectToAction("Index");
}
catch
{
ModelState.addModelError("", "There was an issue processing the results.");
DatabaseEntities db = new DatabaseEntities();
var prodList = from b in db.SysUser3
select new ProductModel
{
ProductId = b.ProductId,
ProductName = b.ProductName,
Selected = b.SelectedProducts
};
return View(prodList.ToList());
}
}
您可能还希望重构select语句以避免重复代码。当你处理列表时,它们不会保持它们的状态。我同意bobek的观点。问题是您没有在post操作中重新初始化模型。大概是这样的:
@using (@Html.BeginForm("TestView", "Controller Name"))
{
//all your input here
// submit button here
}
[HttpGet]
public ActionResult CheckView()
{
DatabaseEntities db = new DatabaseEntities();
var prodList = from b in db.SysUser3
select new ProductModel
{
ProductId = b.ProductId,
ProductName = b.ProductName,
Selected = b.SelectedProducts
};
var p = prodList.ToList();
return View(p);
}
[HttpPost]
public ActionResult CheckView(FormCollection collection)
{
try
{
ProductModel model = new ProductModel();
// Get all the selected checkboxlist, do db insertion
model.CheckedColumn = collection["CheckView"].Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
return RedirectToAction("Index");
}
catch
{
ModelState.addModelError("", "There was an issue processing the results.");
DatabaseEntities db = new DatabaseEntities();
var prodList = from b in db.SysUser3
select new ProductModel
{
ProductId = b.ProductId,
ProductName = b.ProductName,
Selected = b.SelectedProducts
};
return View(prodList.ToList());
}
}
您可能还希望重构select语句以避免重复代码。当您处理列表时,它们不会保持其状态。这是一个已知的错误。将javascript函数附加到提交按钮,该按钮将遍历复选框选项数组并使用.selected=true;在被检查的那个上面。只有这样,它们才会通过post发送。这是一个已知的错误。将javascript函数附加到提交按钮,该按钮将遍历复选框选项数组并使用.selected=true;在被检查的那个上面。只有这样,它们才会通过post发送。您提到的第一段代码,是HttpGet方法吗?请检查问题中我更新的代码。我也加入了HttpGet方法,我也尝试过。虽然在你提到的第二个代码块中,我遇到了一些问题。我对你加入的新“TestView”代码感到困惑。请你帮我一下好吗?是的。因此,基本上,表单正在调用TestView。每当您单击表单上的submit按钮时,TestView操作就是要响应的操作。CheckView操作是在开始时加载视图的操作。请看这里:您提到的第一块代码,是HttpGet方法吗?请检查问题中我更新的代码。我也加入了HttpGet方法,我也尝试过。虽然在你提到的第二个代码块中,我遇到了一些问题。我对你加入的新“TestView”代码感到困惑。请你帮我一下好吗?是的。因此,基本上,表单正在调用TestView。每当您单击表单上的submit按钮时,TestView操作就是要响应的操作。CheckView操作是在开始时加载视图的操作。请过来: