问题描述
我有两个表“ Project”和“ Offices”,我想实现“多对多”关系,从而产生“ ProjectManagement”表。
我想在创建项目时定义负责办公室,我执行了create动作,但是[HttpPost] edit动作出现问题,我通过删除“ ProjectManagement”表中所有与之相关的先前记录来解决此问题使用当前编辑的项目,然后重新保存新的编辑,但效果不太好。
Project.cs
public class Project
{
public int Id { get; set; }
public string ProjectCode { get; set; }
public string Donor { get; set; }
public DateTime StartDate { get; set; }
public DateTime EndtDate { get; set; }
}
Office.cs
public class Office
{
public int Id { get; set; }
public int RegionId { get; set; }
public string OfficeName { get; set; }
public string OfficeAddress { get; set; }
public string Latitude_y { get; set; }
public string Longitude_x { get; set; }
public virtual Region Region { get; set; }
public bool Selected { get; set; }
}
ProjectManagement.cs
public class ProjectManagement
{
public int Id { get; set; }
public int ProjectId { get; set; }
public int OfficeId { get; set; }
public virtual Project Project { get; set; }
public virtual Office Office { get; set; }
}
Projectviewmodel.cs
public class Projectviewmodel
{
public int Id { get; set; }
public string ProjectCode { get; set; }
public string Donor { get; set; }
public DateTime StartDate { get; set; }
public DateTime EndtDate { get; set; }
public string Notes { get; set; }
public IList<SelectListItem> Offices { get; set; }
}
// GET:项目/创建
public IActionResult Create()
{
var offices = _office.Entity.GetAll();
var item = offices.Select(x => new SelectListItem()
{
Text = x.OfficeName,Value = x.Id.ToString()
}).ToList();
var projectVM = new Projectviewmodel()
{
Offices = item
};
return View(projectVM);
}
// POST:项目/创建
[HttpPost]
[ValidateAntiForgeryToken]
public IActionResult Create(Projectviewmodel model)
{
if (ModelState.IsValid)
{
Project project = new Project
{
ProjectCode = model.ProjectCode,Donor = model.Donor,StartDate = model.StartDate,EndtDate = model.EndtDate
};
_project.Entity.Insert(project);
_project.Save();
var officeIds = model.Offices.Where(x => x.Selected).Select(y => y.Value);
foreach (var id in officeIds)
{
ProjectManagement pm = new ProjectManagement
{
OfficeId = int.Parse(id),ProjectId = project.Id
};
_projectManagement.Entity.Insert(pm);
_projectManagement.Save();
}
return RedirectToAction(nameof(Index));
}
return View(model);
}
// GET:Project / Edit / 5
public IActionResult Edit(int? id)
{
if (id == null)
{
return NotFound();
}
var project = _project.Entity.GetById(id);
if (project == null)
{
return NotFound();
}
var selectedoffices = _projectManagement.Entity.GetAll().Where(a => a.ProjectId == id);
var offices = _office.Entity.GetAll();
foreach (var i in selectedoffices)
{
i.Office.Selected = true;
}
var item = offices.Select(x => new SelectListItem()
{
Text = x.OfficeName,Value = x.Id.ToString(),Selected = x.Selected
}).ToList();
Projectviewmodel projectviewmodel = new Projectviewmodel
{
Id = project.Id,ProjectCode = project.ProjectCode,Donor = project.Donor,StartDate = project.StartDate,EndtDate = project.EndtDate,Offices = item
};
return View(projectviewmodel);
}
// POST:Project / Edit / 5
[HttpPost]
[ValidateAntiForgeryToken]
public IActionResult Edit(int id,Projectviewmodel model)
{
if (id != model.Id)
{
return NotFound();
}
if (ModelState.IsValid)
{
try
{
Project project = new Project
{
Id = model.Id,ProjectCode = model.ProjectCode,EndtDate = model.EndtDate
};
_project.Entity.Update(project);
_project.Save();
}
catch (dbupdateConcurrencyException)
{
if (!ProjectExists(model.Id))
{
return NotFound();
}
else
{
throw;
}
}
var officeIds = model.Offices.Where(x => x.Selected).Select(y => y.Value);
var existingoffices = _projectManagement.Entity.GetAll().Where(x => x.ProjectId == id).ToList();
foreach (var item in existingoffices)
{
_projectManagement.Entity.Delete(item.Id);
_projectManagement.Save();
}
foreach (var i in officeIds)
{
ProjectManagement pm = new ProjectManagement
{
OfficeId = int.Parse(i),ProjectId = id
};
_projectManagement.Entity.Insert(pm);
_projectManagement.Save();
}
return RedirectToAction(nameof(Index));
}
return View(model);
}
编辑视图:
<div class="form-group">
@for (int i = 0; i < Model.Offices.Count; i++)
{
<input type="hidden" asp-for="@Model.Offices[i].Value" />
<input asp-for="Offices[i].Selected" />@Model.Offices[i].Text
}
</div>
解决方法
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