Question

运行此代码时，出现此错误：

“ /”应用程序中的服务器错误。
传递到字典中的模型项的类型为'System.Collections.Generic.List`1 [DAL.DBEntities.tblStudent]'，但此字典需要模型项为'DAL.Model.ClassPromotion'。

这是我的ClassPromotionController：

public class ClassPromotionController : BaseController
{
    studentRepository stdRepo;
    staffRepository parRepo;
    profileRepository profileRepo;
    accessControlRepository accessRepo;
    staffcategoryRepository stcRepo;
    SecurityRepository secRepo;
    classRepository classRepo;
    schoolRepository schoolRepo;

    public ClassPromotionController()
    {
           if (currentUser != null)
           {
               schoolRepo = new schoolRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
               stdRepo = new studentRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
               parRepo = new staffRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
               profileRepo = new profileRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
               accessRepo = new accessControlRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
               classRepo = new classRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
               stcRepo = new staffcategoryRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
               secRepo = new SecurityRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
           }
    }

    public ActionResult Index(int? ddlClassID)
    {
           if (currentUser != null)
           {
               schoolRepo = new schoolRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
               stdRepo = new studentRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
               parRepo = new staffRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
               profileRepo = new profileRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
               accessRepo = new accessControlRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
               classRepo = new classRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
               stcRepo = new staffcategoryRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
               secRepo = new SecurityRepository(new DBEntities(base.BuildConnectionString(currentUser.SqlDataSource, currentUser.SqlDatabase, currentUser.SqlUser, currentUser.SqlPassword)));
           }
    }

    public ActionResult Index(int? ddlClassID)
    {
        var info = schoolRepo.getSchoolInfo();
        ViewBag.SessionList = schoolRepo.getSessionList();
        ViewBag.ClassList = classRepo.getClassList();
        ViewBag.ClassID = ddlClassID;

        return View(stdRepo.getStudentList(currentUser.User.SchoolInfo.Session, ddlClassID));
    }
}

这是视图（index.html）：

    @model DAL.Model.ClassPromotion
    @{
        ViewBag.Title = "Index";
        Layout = "~/Views/Shared/_Layout.cshtml";
        DAL.Model.UserSession sess = (DAL.Model.UserSession)HttpContext.Current.Session["UserSession"];
     }
    <hr />
    <h4>
        <i class="fa fa-arrow-circle-right"></i>
        <b>Manage Class Promotion</b>
    </h4>
    <hr />

    <div class="form-group">
    <div class="row">
    <div class="col-md-12">
   <label class="col-md-1 control-label">From Class</label>
        <div class="col-md-3">
            @Html.DropDownList("ddlClassID", new SelectList(ViewBag.ClassList, "ClassID", "ClassName", (object)ViewBag.ClassID), "All", new Dictionary<string, object> { { "class", "form-control selectpicker" }, { "data-live-search", "true" } })
            @Html.ValidationMessage("ddlClassID")
        </div>
        <label class="col-md-3 control-label">Session :</label>
        <div class="col-md-9">
            @Html.DropDownListFor(model => model.Session, new SelectList(ViewBag.SessionList, "Session", "Session"), new Dictionary<string, object> { { "class", "form-control selectpicker" }, { "data-live-search", "true" } })
        </div>

        <label class="col-md-1 control-label">To Class</label>
        <div class="col-md-3">
            @Html.DropDownList("ddlClassID", new SelectList(ViewBag.ClassList, "ClassID", "ClassName", (object)ViewBag.ClassID), "All", new Dictionary<string, object> { { "class", "form-control selectpicker" }, { "data-live-search", "true" } })
            @Html.ValidationMessage("ddlClassID")
        </div>
        <label class="col-md-3 control-label">Session :</label>
        <div class="col-md-9">
            @Html.DropDownListFor(model => model.Session, new SelectList(ViewBag.SessionList, "Session", "Session"), new Dictionary<string, object> { { "class", "form-control selectpicker" }, { "data-live-search", "true" } })
        </div>

        <span class="pull-right">
            <button id="AddNew" class="btn btn-danger ">Promoted</button>
        </span>
    </div>
    </div>
</div>

Answer 1

我没有足够的声誉点可以发表评论，因此我很抱歉将其发布为解决方案。

但是，查看模型会很有帮助。我不一定认为您的控制器是问题所在。我注意到的一件事是“ @model DAL.Model.ClassPromotion”'Model.ClassPromotion'全部为蓝色。通常，该文件夹不是蓝色的。但是我不确定您的文件夹结构是什么样的，或者该名称是否合法。

那么您的文件夹名称是什么，传递给View的模型是什么？

此外，您可以将“新的DBEntities（base.BuildConnectionString（currentUser.SqlDataSource，currentUser.SqlDatabase，currentUser.SqlUser，currentUser.SqlPassword）”或至少其中一部分转换为变量，以便于阅读。肯定有更好的方法，尤其是在使用Entity Framework的情况下，但这并不是问题所在。

运行我的应用程序时，出现错误

1 个答案: