官网插件文档是2.0的，现在新版的插件2.4的文档没有，按照2.0的写法不对，求指点。

[zjszk]

`using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using SiteServer.Plugin;

namespace Site.Teacher
{
public class Main : PluginBase
{

    private const string SubTitle1 = "SubTitle";
    private const string ImageUrl1 = "ImageUrl";
    private const string Content1 = "Content";
    private const string stardata = "stardata";

    public override void Startup(IService service)
    {
        service.AddContentModel("cms_teacher", new List<TableColumn>
    {
        new TableColumn
        {
            AttributeName = SubTitle1,
            DataType = DataType.VarChar,
            DataLength = 255,
            InputStyle = new InputStyle
            {
                InputType = InputType.Text,
                DisplayName = "最高职称",
                IsRequired = true
            }
        },
        new TableColumn
        {
            AttributeName = ImageUrl1,
            DataType = DataType.VarChar,
            DataLength = 200,
            InputStyle = new InputStyle
            {
                InputType = InputType.Image,
                DisplayName = "照片",
                IsRequired = true,
             }
        },
        new TableColumn
        {
            AttributeName = Content1,
            DataType = DataType.Text,
            InputStyle = new InputStyle
            {
                InputType = InputType.TextEditor,
                DisplayName = "教师介绍",
                IsRequired = true
            }
        },
        new TableColumn
        {
            AttributeName = stardata,
            DataType = DataType.DateTime,
            InputStyle = new InputStyle
            {
                InputType = InputType.Date,
                DisplayName = "参加工作时间",
                IsRequired = true
            }
        }
     });
    }
}

}
`
运行提示：TableColumn 未找到类型名或者命名空间， DataType 上下文不存在。插板库版本2.4，求指点，小白。