所需数据未显示在html.dropdownlist MVC中 [英] Required data not displayed in html.dropdownlist MVC

问题描述

我正在尝试从模型中填充一些数据以在下拉列表中查看.为此，我将模型创建为

I am trying to populate some data from model to view in a dropdown list. For that I have created my model as

型号:

public class NoOfSupportingLanguages
{
    public int LanguageId { get; set; }
    public string LanguageName { get; set; }
}
public class OrganisationModel
{
      public SelectList NoofSupportingLanguages { get; set; }
}

在控制器端，类似这样:

And on the controller side , something like this:

控制器:

public ActionResult Index()
        {
            List<NoOfSupportingLanguages> LanguageOption = new         List<NoOfSupportingLanguages>{
                new NoOfSupportingLanguages{ LanguageId = 1, LanguageName="English" },
                new NoOfSupportingLanguages{ LanguageId = 2, LanguageName="Arabic" },
                new NoOfSupportingLanguages{ LanguageId = 3, LanguageName="French" }
            };
            SelectList languageList = new SelectList(LanguageOption, "LanguageId");
            model.NoofSupportingLanguages = languageList;
            return View(model);
        }

查看:

 @Html.LabelFor(m => m.NoofSupportingLanguages, "Number of languages to support :")
 @Html.DropDownList("ddlNoOfSupportingLanguages", Model.NoofSupportingLanguages)

但是在下拉菜单中，我得到的值是:

but in my dropdown I am getting values as :

Web.Models.Organisation.NoOfSupportingLanguages
Web.Models.Organisation.NoOfSupportingLanguages
Web.Models.Organisation.NoOfSupportingLanguages

请提出一些帮助.

预先感谢！

推荐答案

如果要以干净的MVC方式进行操作，则应更改模型:

If you want to do it in a clean MVC way you should change your model:

public class OrganisationModel
{
      public int SelectedLanguageId { get; set; }
      public List<SelectListItem> NoofSupportingLanguages { get; set; }
}

然后在您的控制器中:

    public ActionResult Index()
    {
        List<SelectListItem> LanguageOption = new List<SelectListItem>{
            new SelectListItem { Value = 1.ToString(), Text = "English" },
            new SelectListItem { Value = 2.ToString(), Text = "Arabic" },
            new SelectListItem { Value = 3.ToString(), Text = "French" }
        };
        //here you can set selected value
        model.SelectedLanguageId = 1;
        model.NoofSupportingLanguages = LanguageOption;
        return View(model);
    }

然后您将可以执行以下操作:

And then you will be able to do like this:

 @Html.LabelFor(m => m.NoofSupportingLanguages, "Number of languages to support :")
 @Html.DropDownListFor(m => m.SelectedLanguageId, Model.NoofSupportingLanguages, "Select Language")

现在，当您发布模型时，它将自动将选定的LanguageId绑定到SelectedLanguageId模型属性.

Now when you POST your model it will automatically bind Selected LanguageId to SelectedLanguageId model property.

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