将DropDownList SelectList转换为List<> [英] Convert DropDownList SelectList to List<>

问题描述

新SelectList出错：无法将SelectList转换为List<>

Error on new SelectList: "Can not convert SelectList to List<>"

listclass tables = new listclass();
public ActionResult Index()
{
    tables.list = new SelectList(new[] {
                    new {ID="1",Name="name1"},
                    new{ID="2",Name="name2"},
                    new{ID="3",Name="name3"},
                },
                "ID", "Name", 1);
    return View(tables);
}

Class1.cs

Class1.cs

namespace DropDownList2.Models
{
    public class Table1
    {
        [Key]
        public int ID { get; set; }
        public string Name { get; set; }
    }
    public class listclass
    {
        public List<Table1> list { get; set; }
    }
}

Index.cshtml

Index.cshtml

@model DropDownList2.Models.listclass


@Html.DropDownList("ddl0", new SelectList(Model.list, "ID", "Name"))

推荐答案

tables.list = new SelectList

list属性是List< Table>并且您将其设置为SelectList。 SelectList不是List< Table>所以这是行不通的。 Google提供了如何使用下拉列表和使用MVC的SelectList的示例。

The "list" property is List<Table> and you are setting it to SelectList. SelectList isn't List<Table> so that won't work. Google for examples of how to use dropdowns and SelectList with MVC.

您的属性类型为列表< Table1> 。



您正在尝试将其设置为 SelectList 类型的值。



这是两种完全不同的类型，它们之间没有隐式转换。



更改代码以将属性设置为正确的值类型：

Your property is of type List<Table1>.

You are trying to set it to a value of type SelectList.

Those are two completely different types, and there is no implicit conversion between them.

Change your code to set the property to a value of the correct type:

tables.list = new List<Table1>
{
    new Table1 { ID = "1", Name = "name1" },
    new Table1 { ID = "2", Name = "name2" },
    new Table1 { ID = "3", Name = "name3" },
};

如果你不明白为什么你不能将一种类型的值赋给不同类型的属性，那么你需要阅读一些基本的C＃教程。

If you don't understand why you can't assign a value of one type to a property of a different type, then you need to read some basic C# tutorials.

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