Question

错误是：Using the generic type 'System.Collections.Generic.List<T>' requires 1 type arguments

我不知道为什么会发生这种情况，请记住我对C＃很新，并且还不清楚如何使用它。我正在尝试让文件从数据库表中检索列并将其插入带有额外标头的CSV文件中。数据库表是cmsDictionary，列是键，这应该填充CSV键列，其他应该是空白的，由用户填充，然后将其导入到cmsLanguageText表中。

//This is my controller file which is throwing the error.

using UmbracoImportExportPlugin.Models;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;
using System.Text;
using Umbraco.Core.Persistence;
using Umbraco.Web;
using Umbraco.Web.WebApi;
using System.Data;
using System.Data.SqlClient;

namespace UmbracoImportExportPlugin.App_Code
{
    public class ExportDictionaryAllController : UmbracoAuthorizedApiController
    {

        [System.Web.Http.AcceptVerbs("GET", "POST")]
        public static void ExportAll(List<Item> DictionaryItems)
        {
            getList(List<Item> DictionaryItems);
            string attachment = "attachment; filename= DictionaryItems.csv";
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.ClearHeaders();
            HttpContext.Current.Response.ClearContent();
            HttpContext.Current.Response.AddHeader("Content-Disposition", attachment);
            HttpContext.Current.Response.ContentType = "text/csv";
            HttpContext.Current.Response.AddHeader("Pragma", "public");
            WriteColumnName();
            foreach (Item item in DictionaryItems)
            {
                WriteItemInfo(item);
            }
            HttpContext.Current.Response.End();
        }

        private static void WriteItemInfo(Item item)
        {
            StringBuilder sb = new StringBuilder();
            AddComma(item.Key, sb);
            AddComma(item.English, sb);
            AddComma(item.Hebrew, sb);
            AddComma(item.Russian, sb);
            HttpContext.Current.Response.Write(sb.ToString());
            HttpContext.Current.Response.Write(Environment.NewLine);
        }

        private static void AddComma(string value, StringBuilder sb)
        {
            sb.Append(value.Replace(',', ' '));
            sb.Append(", ");
        }

        private static void WriteColumnName()
        {
            string columnNames = "Key, English, Hebrew, Russian";
            HttpContext.Current.Response.Write(columnNames);
            HttpContext.Current.Response.Write(Environment.NewLine);
        }

        public List<String> getList(List<Item> DictionaryItems)
        {
            UmbracoDatabase db = ApplicationContext.DatabaseContext.Database;
            var select = new Sql("SELECT key FROM cmsDictionary");
            List<Item> DictionaryItems = db.Fetch<Item>(select);
            return DictionaryItems;
        }
    }
}

Answer 1

嗯，这条线似乎错了：

getList(List<Item> DictionaryItems);

应该是：

getList(DictionaryItems);

编译器错误应该在代码文件中给出一行错误。

Answer 2

将此作为您的方法定义：

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                            <a data-toggle="tab" href="#demo-lft-tab-1">Tab1</a>
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</script>

不知道为什么我收到这个C＃错误

2 个答案: