C# 将数据从控制器传递到视图-MVC

我正在尝试进行查询，以接收数据库中的所有数据，并在视图中显示这些数据

但它不起作用。我不知道发生了什么，因为我没有得到任何错误

有人能帮忙吗

提前谢谢

控制器：

public ActionResult Details(int id = 0)
            {
                Persons p= db.persons.Find(id);

                var query = from a in db.images
                            where a.Id_Person== id
                            select a.FileName;
                ViewBag.ImgRev= query;

                if (mag == null)
                {
                    return HttpNotFound();
                }

                return View(p);
            }

@foreach (var p in ViewBag.ImgRev)
        { 
          <div>
            <img src="~/Files/" + @p /></div>
        }

ViewBag.ImgRev = query.ToList();

@ {
    var imgList = ViewBag.ImgRev as IEnumerable<string>;
}

@foreach (var p in imgList)
{ 
    <div><img src="~/Files/" + @p /></div>
}

...
var model = new SomePageViewModel { Persons = p, Files = query.ToList() };
return model;

@foreach (var file in Model.Files)
{ 
    <div><img src="~/Files/" + @file /></div>
}

查看：

public ActionResult Details(int id = 0)
            {
                Persons p= db.persons.Find(id);

                var query = from a in db.images
                            where a.Id_Person== id
                            select a.FileName;
                ViewBag.ImgRev= query;

                if (mag == null)
                {
                    return HttpNotFound();
                }

                return View(p);
            }

@foreach (var p in ViewBag.ImgRev)
        { 
          <div>
            <img src="~/Files/" + @p /></div>
        }

ViewBag.ImgRev = query.ToList();

@ {
    var imgList = ViewBag.ImgRev as IEnumerable<string>;
}

@foreach (var p in imgList)
{ 
    <div><img src="~/Files/" + @p /></div>
}

...
var model = new SomePageViewModel { Persons = p, Files = query.ToList() };
return model;

@foreach (var file in Model.Files)
{ 
    <div><img src="~/Files/" + @file /></div>
}

@foreach（ViewBag.ImgRev中的变量p）
{ 
}

在将linq语句分配给

ViewBag

之前，不会对其进行求值

尝试：

控制器：

public ActionResult Details(int id = 0)
            {
                Persons p= db.persons.Find(id);

                var query = from a in db.images
                            where a.Id_Person== id
                            select a.FileName;
                ViewBag.ImgRev= query;

                if (mag == null)
                {
                    return HttpNotFound();
                }

                return View(p);
            }

@foreach (var p in ViewBag.ImgRev)
        { 
          <div>
            <img src="~/Files/" + @p /></div>
        }

ViewBag.ImgRev = query.ToList();

@ {
    var imgList = ViewBag.ImgRev as IEnumerable<string>;
}

@foreach (var p in imgList)
{ 
    <div><img src="~/Files/" + @p /></div>
}

...
var model = new SomePageViewModel { Persons = p, Files = query.ToList() };
return model;

@foreach (var file in Model.Files)
{ 
    <div><img src="~/Files/" + @file /></div>
}

查看：

public ActionResult Details(int id = 0)
            {
                Persons p= db.persons.Find(id);

                var query = from a in db.images
                            where a.Id_Person== id
                            select a.FileName;
                ViewBag.ImgRev= query;

                if (mag == null)
                {
                    return HttpNotFound();
                }

                return View(p);
            }

@foreach (var p in ViewBag.ImgRev)
        { 
          <div>
            <img src="~/Files/" + @p /></div>
        }

ViewBag.ImgRev = query.ToList();

@ {
    var imgList = ViewBag.ImgRev as IEnumerable<string>;
}

@foreach (var p in imgList)
{ 
    <div><img src="~/Files/" + @p /></div>
}

...
var model = new SomePageViewModel { Persons = p, Files = query.ToList() };
return model;

@foreach (var file in Model.Files)
{ 
    <div><img src="~/Files/" + @file /></div>
}

查看：

public ActionResult Details(int id = 0)
            {
                Persons p= db.persons.Find(id);

                var query = from a in db.images
                            where a.Id_Person== id
                            select a.FileName;
                ViewBag.ImgRev= query;

                if (mag == null)
                {
                    return HttpNotFound();
                }

                return View(p);
            }

@foreach (var p in ViewBag.ImgRev)
        { 
          <div>
            <img src="~/Files/" + @p /></div>
        }

ViewBag.ImgRev = query.ToList();

@ {
    var imgList = ViewBag.ImgRev as IEnumerable<string>;
}

@foreach (var p in imgList)
{ 
    <div><img src="~/Files/" + @p /></div>
}

...
var model = new SomePageViewModel { Persons = p, Files = query.ToList() };
return model;

@foreach (var file in Model.Files)
{ 
    <div><img src="~/Files/" + @file /></div>
}

@foreach（Model.Files中的var文件）
{ 
}

在将linq语句分配给

ViewBag

之前，不会对其进行求值

尝试：

控制器：

public ActionResult Details(int id = 0)
            {
                Persons p= db.persons.Find(id);

                var query = from a in db.images
                            where a.Id_Person== id
                            select a.FileName;
                ViewBag.ImgRev= query;

                if (mag == null)
                {
                    return HttpNotFound();
                }

                return View(p);
            }

@foreach (var p in ViewBag.ImgRev)
        { 
          <div>
            <img src="~/Files/" + @p /></div>
        }

ViewBag.ImgRev = query.ToList();

@ {
    var imgList = ViewBag.ImgRev as IEnumerable<string>;
}

@foreach (var p in imgList)
{ 
    <div><img src="~/Files/" + @p /></div>
}

...
var model = new SomePageViewModel { Persons = p, Files = query.ToList() };
return model;

@foreach (var file in Model.Files)
{ 
    <div><img src="~/Files/" + @file /></div>
}

查看：

public ActionResult Details(int id = 0)
            {
                Persons p= db.persons.Find(id);

                var query = from a in db.images
                            where a.Id_Person== id
                            select a.FileName;
                ViewBag.ImgRev= query;

                if (mag == null)
                {
                    return HttpNotFound();
                }

                return View(p);
            }

@foreach (var p in ViewBag.ImgRev)
        { 
          <div>
            <img src="~/Files/" + @p /></div>
        }

ViewBag.ImgRev = query.ToList();

@ {
    var imgList = ViewBag.ImgRev as IEnumerable<string>;
}

@foreach (var p in imgList)
{ 
    <div><img src="~/Files/" + @p /></div>
}

...
var model = new SomePageViewModel { Persons = p, Files = query.ToList() };
return model;

@foreach (var file in Model.Files)
{ 
    <div><img src="~/Files/" + @file /></div>
}

查看：

public ActionResult Details(int id = 0)
            {
                Persons p= db.persons.Find(id);

                var query = from a in db.images
                            where a.Id_Person== id
                            select a.FileName;
                ViewBag.ImgRev= query;

                if (mag == null)
                {
                    return HttpNotFound();
                }

                return View(p);
            }

@foreach (var p in ViewBag.ImgRev)
        { 
          <div>
            <img src="~/Files/" + @p /></div>
        }

ViewBag.ImgRev = query.ToList();

@ {
    var imgList = ViewBag.ImgRev as IEnumerable<string>;
}

@foreach (var p in imgList)
{ 
    <div><img src="~/Files/" + @p /></div>
}

...
var model = new SomePageViewModel { Persons = p, Files = query.ToList() };
return model;

@foreach (var file in Model.Files)
{ 
    <div><img src="~/Files/" + @file /></div>
}

@foreach（Model.Files中的var文件）
{ 
}

您是否已调试并看到有数据？请检查。。它是空的。。我错了什么？我错过了一些东西。你调试过并看到有数据吗？检查一下。。它是空的。。我错了什么？我错过了一些东西Romoku你从哪里来？我猜到了类名。我尝试了你的代码，但现在我得到了这个错误：对象引用未设置为对象的实例：断点foreachi已在控制器中设置了breakpont，并已检查查询，但仍然为空…确保它已连接到数据库。romoku您来自何处？我猜到了类名。我尝试了您的代码，但现在发现以下错误：对象引用未设置为对象的实例：断点foreachi已在控制器中设置了breakpont，并已检查查询，但仍然为null…确保它已连接到数据库。