如何使用 asp.net MVC 在 GridView 中编辑数据？
[英]How to edit data in GridView using asp.net MVC?
问题描述
I am binding data to the gridview from SQL server but having some issues with the Edit.
我正在将数据从 SQL 服务器绑定到 gridview，但在编辑时遇到了一些问题。
Here is my model code:这是我的模型代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Data.Entity;
namespace Gridview_BugTracker.Models
{
public class BugTracker_DataHelper
{
public static List<BugTracker_DataHelper> GetList{get;set;}
public string ProjectId { get; set; }
public string projectName { get; set; }
public string Description { get; set; }
public string status { get; set; }
}
}
Here is my controller code这是我的控制器代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Data;
using Gridview_BugTracker.Models;
using System.Data.SqlClient;
using System.Data.Entity;
namespace Gridview_BugTracker.Controllers
{
public class ProjectsController : Controller
{
//
// GET: /Projects/
public ActionResult Index()
{
var bugedlist = GetList();
return View(bugedlist);
}
[HttpGet]
public ActionResult Edit(int projectId)
{
BugTracker_DataHelper bugedit = new BugTracker_DataHelper();
var edit = EditList();
bugedit.ProjectId =Convert.ToString(projectId);
return View(edit);
}
public List<BugTracker_DataHelper> GetList()
{
var modelList = new List<BugTracker_DataHelper>();
using (SqlConnection conn = new SqlConnection(@"Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=BugTracker;Data Source=SSDEV6\SQLEXPRESS"))
{
conn.Open();
SqlCommand dCmd = new SqlCommand("Select * from Projects", conn);
SqlDataAdapter da = new SqlDataAdapter(dCmd);
DataSet ds = new DataSet();
da.Fill(ds);
conn.Close();
for (int i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
{
var model = new BugTracker_DataHelper();
model.ProjectId = ds.Tables[0].Rows[i]["ProjectId"].ToString();
model.projectName = ds.Tables[0].Rows[i]["projectName"].ToString();
model.Description = ds.Tables[0].Rows[i]["Description"].ToString();
model.status = ds.Tables[0].Rows[i]["Status"].ToString();
modelList.Add(model);
}
}
return modelList;
}
[HttpPost]
public ActionResult EditList()
{
var editlist = new List<BugTracker_DataHelper>();
using (SqlConnection editconn=new SqlConnection(@"Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=BugTracker;Data Source=SSDEV6\SQLEXPRESS"))
{
editconn.Open();
var modeledit = new BugTracker_DataHelper();
SqlCommand ecmd = new SqlCommand("EditGetList", editconn);
ecmd.CommandType = CommandType.StoredProcedure;
ecmd.Parameters.Add("@projectID", SqlDbType.Int).Value = modeledit.ProjectId;
Object prjid = ecmd.ExecuteNonQuery();
editconn.Close();
editlist.Add(modeledit);
}
return View(editlist);
}
Gridview Code网格视图代码
<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<IEnumerable<Gridview_BugTracker.Models.BugTracker_DataHelper>>" %>
<!DOCTYPE html>
<html>
<head runat="server">
<title>Index</title>
</head>
<body>
<div>
<h2>Index</h2>
<table>
<tr>
<th>
ProjectName
</th>
<th>
Status
</th>
</tr>
<% foreach (var item in Model) { %>
<tr>
<td>
<%:Html.LabelForModel(item.projectName) %>
</td>
<td>
<%:Html.LabelForModel(item.status) %>
</td>
<td>
<%: Html.ActionLink("Edit", "Edit", new { projectId = item.projectName})%> |
<%: Html.ActionLink("Details", "Details", new { projectId = item.Description })%> |
<%: Html.ActionLink("Delete", "Delete", new { projectId = item.status })%>
</td>
</tr>
<%} %>
</table>
</div>
</body>
</html>
Edit page code:编辑页面代码：
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/SiteMaster.Master" Inherits="System.Web.Mvc.ViewPage<Gridview_BugTracker.Models.BugTracker_DataHelper>" %>
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
editindex
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<h2>editindex</h2>
<fieldset>
<legend>EDit</legend>
<div class="editor-label">
<%: Html.LabelFor(Model => Model.ProjectId) %>
</div>
<div class="editor-field">
<%: Html.EditorFor(model => model) %>
<%: Html.ValidationMessageFor(model => model.projectName) %>
</div>
<div class="editor-label">
<%: Html.LabelFor(model => model.Description) %>
</div>
<div class="editor-field">
<%: Html.EditorFor(model => model.Description) %>
<%: Html.ValidationMessageFor(model => model.Description)%>
</div>
<div class="editor-label">
<%: Html.LabelFor(model => model.status) %>
</div>
<div class="editor-field">
<%: Html.EditorFor(model => model.status) %>
<%: Html.ValidationMessageFor(model => model.status) %>
</div>
<p>
<input type="submit" value="Save" />
</p>
</fieldset>
</asp:Content>
When i click the edit button I am getting the following error.当我单击编辑按钮时，我收到以下错误。
Server Error in '/' Application. “/”应用程序中的服务器错误。
The parameters dictionary contains a null entry for parameter 'projectId' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult Edit(Int32)' in 'Gridview_BugTracker.Controllers.ProjectsController'.参数字典包含“Gridview_BugTracker.Controllers.ProjectsController”中方法“System.Web.Mvc.ActionResult Edit(Int32)”的不可空类型“System.Int32”的参数“projectId”的空条目。 An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.可选参数必须是引用类型、可空类型或声明为可选参数。 Parameter name: parameters Description: An unhandled exception occurred during the execution of the current web request.参数名称：parameters 描述：当前web请求执行过程中发生了未处理的异常。 Please review the stack trace for more information about the error and where it originated in the code.请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。
Can anyone please help?有人可以帮忙吗？
3 个解决方案
解决方案1
0 2012-07-16 10:46:28
I believe your problem may be in the following line.我相信您的问题可能在以下行。
<%: Html.ActionLink("Edit", "Edit", new { projectId = item.projectName})%>
Your edit action is expecting an Int but you are passing it what I am assuming is a string.您的编辑操作需要一个 Int 但您正在传递它，我假设它是一个字符串。 So its never binding correctly and therefore you end up with a null projectId.所以它永远不会正确绑定，因此你最终会得到一个 null projectId。
Hope this helps.希望这可以帮助。
解决方案2
0 2012-07-16 11:09:57
ProjectName is declared as string
public string projectName { get; set; }
While editing the item you should be passing an int but you are passing a string在编辑项目时，您应该传递一个 int 但您传递的是一个字符串
<%: Html.ActionLink("Edit", "Edit", new { projectId = item.projectName})%>
解决方案3
0 2014-12-03 07:39:17
public ActionResult Edit(int projectId)
{
BugTracker_DataHelper bugedit = new BugTracker_DataHelper();
var edit = EditList();
bugedit.ProjectId =Convert.ToString(projectId);
return View(edit);
}
I think Your problem lies in the method, the method should be rewritten as below:我认为您的问题在于方法，该方法应重写如下：
public ActionResult Edit(int projectId)
{
BugTracker_DataHelper bugedit = new BugTracker_DataHelper();
bugedit.ProjectId =Convert.ToString(projectId);
var edit = EditList();
return View(edit);
}
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