如何绑定MVC5中的dropdownlist控件的值 [英] How to bind values for dropdownlist control in MVC5
问题描述
大家好，我只是想将值绑定到下拉列表控件。我看不到任何例子，但它对我不起作用。请找到我的代码和错误，并帮我解决这个问题。
//我的模特
public class SubjectModel
{
public int selectedid {get; set;}
public List< SelectListItem> ddllist {get; set;}
public SubjectModel（）
{
ddllist = new List< SelectListItem> ;（）;
}
}
//我的控制器
public ActionResult DropDownTest（）
{
SubjectModel model = new SubjectModel（）;
model.ddllist.Add（new SelectListItem {Text =Physics，Value =1}）;
model.ddllist.Add（new SelectListItem {Text =Chemistry，值=2}）;
model.ddllist.Add（new SelectListItem {Text =Mathematics，Value =3}）;
model.selectedid = 0;
返回查看（型号）;
}
//我的观点
<！DOCTYPE HTML PUBLIC - // W3C // DTD XHTML 1.0 Transitional // ENhttp：//www.w3。 org / TR / xhtml1 / DTD / xhtml1-transitional.dtd>
<％@ Page Language =C＃Inherits =System.Web.Mvc.ViewPage< dopdownbinding.models.subjectmodel>％>
< html>
< head>
< meta charset =UTF-8 />
< meta name =viewportc />
< title> DropDownBinding< / title>
< / head>
< body>
< label for =timezone>主题< / label>
@ Html.DropDownListFor（model => model。 selectedid，new SelectList（Model.ddllist，SubCategoryId，SubCategoryName，Model.selectedid））
< / body>
< / html>
我收到这个执行此操作时出错。
表达式树可能不包含动态操作
我是ASP.Net MVC的新手，如果出现问题，请帮我纠正。谢谢< DIV class =h2_lin>解决方案
现在已经解决了。
我的下拉剃须刀代码应该是
@ Html.DropDownListFor（model => model.selectedid，Model.ddllist）
由于我的ddllist属性已经是List< selectlistitem>，它可以正常使用此代码。
Hi All, I am just trying to bind values to a dropdownlist control. I could see no of examples but it is not working for me. Please find my code and the error and help me to solve this.
//My model
public class SubjectModel
{
public int selectedid {get;set;}
public List<SelectListItem> ddllist{get;set;}
public SubjectModel()
{
ddllist = new List<SelectListItem>();
}
}
//My controller
public ActionResult DropDownTest()
{
SubjectModel model = new SubjectModel();
model.ddllist.Add(new SelectListItem { Text = "Physics", Value = "1" });
model.ddllist.Add(new SelectListItem { Text = "Chemistry", Value = "2" });
model.ddllist.Add(new SelectListItem { Text = "Mathematics", Value = "3" });
model.selectedid = 0;
return View(model);
}
//My View
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@Page Language="C#" Inherits="System.Web.Mvc.ViewPage<dopdownbinding.models.subjectmodel>"%>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" c/>
<title>DropDownBinding</title>
</head>
<body>
<label for="timezone">Subjects</label>
@Html.DropDownListFor(model => model.selectedid, new SelectList(Model.ddllist, "SubCategoryId", "SubCategoryName", Model.selectedid))
</body>
</html>
I am getting this error while executing this.
An expression tree may not contain a dynamic operation
I am new to ASP.Net MVC and please help me correct if something is wrong.Thanks
This has been resolved now.
My dropdown razor code should be
@Html.DropDownListFor(model => model.selectedid, Model.ddllist)
since my ddllist property is already a List<selectlistitem>, it works fine with this code.
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