有什么办法可以使多个下拉菜单在同一剃刀页面上显示来自同一数据库实体的数据，而无需创建具有新ID（例如ResourceID，ResourceID1; ResourceID2）的多个类？
我能够在'Create.cshtml'和'Edit.cshtml'剃须刀页面中显示来自MS SQL数据库的适当数据的下拉列表，但是保存时所选的数据将显示所选资源的ID，而不是“ Index.cshtml”，“ Detail.cshtml”和“ Delete.cshtml”视图中的资源名称。
资源模型：
namespace ProjectReporting.Models
{
public class Resource
{
public int ID { get; set; }
[Display(Name = "First Name")]
public string FirstName { get; set; }
[Display(Name = "Last Name")]
public string LastName { get; set; }
[Display(Name = "Long Name")]
public string LongName { get; set; }
[DefaultValue(true)]
[Display(Name = "Active")]
public bool IsActive { get; set; } = true;
[Display(Name = "Is Manager")]
public bool IsManager { get; set; }
[Display(Name = "Is Forecast Owner")]
public bool IsForecastOwner { get; set; }
public ICollection<Project> Projects { get; set; }
}
}
项目模型：
namespace ProjectReporting.Models
{
public class Project
{
public int ID { get; set; }
[Display(Name = "ID")]
public int PID { get; set; }
[Display(Name = "Project Name")]
public string ProjectName { get; set; }
[Display(Name = "Forecast Owner")]
public int ResourceID { get; set; }
public Resource Resource { get; set; }
[Display(Name = "DSM")]
public int? ResourceID1 { get; set; }
public ICollection<ProjectComment> ProjectComments { get; set; }
}
}
[Create.cshtml页面：
@page
@model ProjectReporting.Pages.Projects.CreateModel
@{
ViewData["Title"] = "Create";
}
<h1>Create</h1>
<h4>Project</h4>
<hr />
<div class="row">
<div class="col-md-4">
<form method="post">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<div class="form-group">
<label asp-for="Project.PID" class="control-label"></label>
<input asp-for="Project.PID" class="form-control" />
<span asp-validation-for="Project.PID" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Project.ProjectName" class="control-label"></label>
<input asp-for="Project.ProjectName" class="form-control" />
<span asp-validation-for="Project.ProjectName" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Project.ResourceID" class="control-label"></label>
<select asp-for="Project.ResourceID" class="form-control" asp-items="ViewBag.ResourceID"><option value="" default="" selected="">-- Select --</option></select>
</div>
<div class="form-group">
<label asp-for="Project.ResourceID1" class="control-label"></label>
<select asp-for="Project.ResourceID1" class="form-control" asp-items="ViewBag.ResourceID1"><option value="" default="" selected="">-- Select --</option></select>
</div>
<div class="form-group form-check">
<label class="form-check-label">
<input class="form-check-input" asp-for="Project.IsArchived" /> @Html.DisplayNameFor(model => model.Project.IsArchived)
</label>
</div>
<div class="form-group">
<input type="submit" value="Create" class="btn btn-primary" />
</div>
</form>
</div>
</div>
<div>
<a asp-page="Index">Back to List</a>
</div>
@section Scripts {
@{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}
[Create.cshtml页面：
namespace ProjectReporting.Pages.Projects
{
public class CreateModel : PageModel
{
private readonly ProjectReporting.Data.ApplicationDbContext _context;
public CreateModel(ProjectReporting.Data.ApplicationDbContext context)
{
_context = context;
}
public IActionResult OnGet()
{
ViewData["OrganisationID"] = new SelectList(_context.ProjectType.Where(a => a.IsActive == true), "ID", "TypeName");
ViewData["ResourceID"] = new SelectList(_context.Resource.Where(a => a.IsActive & a.IsForecastOwner == true), "ID", "LongName");
ViewData["ResourceID1"] = new SelectList(_context.Resource.Where(a => a.IsActive == true), "ID", "LongName");
return Page();
}
[BindProperty]
public Project Project { get; set; }
// To protect from overposting attacks, please enable the specific properties you want to bind to, for
// more details see https://aka.ms/RazorPagesCRUD.
public async Task<IActionResult> OnPostAsync()
{
if (!ModelState.IsValid)
{
return Page();
}
_context.Project.Add(Project);
await _context.SaveChangesAsync();
return RedirectToPage("./Index");
}
}
}
Index.cshtml页面：
@page
@model ProjectReporting.Pages.Projects.IndexModel
@{
ViewData["Title"] = "Index";
}
<h1>Index</h1>
<p>
<a asp-page="Create">Create New</a>
</p>
<table class="table">
<thead>
<tr>
<th>
@Html.DisplayNameFor(model => model.Project[0].PID)
</th>
<th>
@Html.DisplayNameFor(model => model.Project[0].Organisation)
</th>
<th>
@Html.DisplayNameFor(model => model.Project[0].ProjectName)
</th>
<th>
@Html.DisplayNameFor(model => model.Project[0].Resource)
</th>
<th>
@Html.DisplayNameFor(model => model.Project[0].ResourceID1)
</th>
<th>
@Html.DisplayNameFor(model => model.Project[0].IsArchived)
</th>
<th></th>
</tr>
</thead>
<tbody>
@foreach (var item in Model.Project) {
<tr>
<td>
@Html.DisplayFor(modelItem => item.PID)
</td>
<td>
@Html.DisplayFor(modelItem => item.Organisation.OrgName)
</td>
<td>
@Html.DisplayFor(modelItem => item.ProjectName)
</td>
<td>
@Html.DisplayFor(modelItem => item.Resource.LongName)
</td>
<td>
@Html.DisplayFor(modelItem => c)
</td>
<td>
@Html.DisplayFor(modelItem => item.IsArchived)
</td>
<td>
<a asp-page="./Edit" asp-route-id="@item.ID">Edit</a> |
<a asp-page="./Details" asp-route-id="@item.ID">Details</a> |
<a asp-page="./Delete" asp-route-id="@item.ID">Delete</a>
</td>
</tr>
}
</tbody>
</table>
item.Resource.LongName对于第一个资源工作正常，但我希望item.Resource.LongName发生相同的情况。
The Index.cshtml.cs
namespace ProjectReporting.Pages.Projects
{
public class IndexModel : PageModel
{
private readonly ProjectReporting.Data.ApplicationDbContext _context;
public IndexModel(ProjectReporting.Data.ApplicationDbContext context)
{
_context = context;
}
public IList<Project> Project { get;set; }
public async Task OnGetAsync()
{
Project = await _context.Project
.Include(p => p.Resource).ToListAsync();
}
}
}
我已经在迁移文件中设置了FK以创建能够检索数据的数据库，并希望避免必须按资源创建一个类文件。
table.ForeignKey(
name: "FK_Project_Resource_ResourceID",
column: x => x.ResourceID,
principalTable: "Resource",
principalColumn: "ID",
onDelete: ReferentialAction.Restrict);
table.ForeignKey(
name: "FK_Project_Resource_ResourceID1",
column: x => x.ResourceID1,
principalTable: "Resource",
principalColumn: "ID",
onDelete: ReferentialAction.Restrict);
结果将在下拉列表中显示正确的数据，并在保存时选择正确的资源ID。但是，索引，详细信息和删除页面仅显示ResourceID，而不显示LongName。如果我对第二个ResourceID1使用Resource.LongName，则它正确显示与ResourceID相同的LongName。
如何在页面上具有指向同一实体的多个资源下拉菜单，并在“索引”，“详细信息”和“删除”页面上显示LongName？