无法找到接口的类型或命名空间;不确定缺少什么

Question

我有两个处理程序，ArticleIndexer.ashx和MediaHighlightsIndexer.ashx。为了创建MediaHighlights，我复制了ArticleIndexer并将“article”替换为“highlght”，它们是相似的（两者之间的唯一区别是Article数据对象和MediaHighlight数据对象的属性）。当我试图运行MediaHighlightsIndexer.ashx时，我收到了这个错误：

“无法找到类型或命名空间名称'IMediaHighlightDao'（您是否缺少using指令或程序集引用？'）

但ArticleIndexer.ashx没有此问题并正确运行。

这个问题会在哪里发生？这会是处理程序中的问题，还是MediaHighlightDao.cs中的问题？所有MediaHighlight文件都与文章文件位于相同的文件夹中，并且它们都具有相同的引用。

这是界面：

using MITSloan.Common.Model;
using System;
using System.Collections.Generic;

namespace MITSloan.Common.Dao
{
    public interface IMediaHighlightDao
    {
        IEnumerable<MediaHighlight> GetHighlights(Int64 categoryId);

        MediaHighlight GetHighlight(Int64 highlightId);

        MediaHighlight GetHighlight(Int64 highlightId, string html);
    }
}

这是处理程序：

<%@ WebHandler Language="C#" Class="MediaHighlightIndexer" %>

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Web;
using Ektron.Cms;
using Ektron.Cms.Framework;
using Ektron.Cms.Framework.Organization;
using MITSloan.Common.Dao;
using MITSloan.Common.Model;
using MITSloan.Data.Dao;
using MITSloan.Search;

public class MediaHighlightIndexer : IHttpHandler {

    private IndexManager _indexManager;
    public IndexManager IndexManager
    {
        get { return _indexManager ?? (_indexManager = new IndexManager()); }
    }

    private static IMediaHighlightDao _mediaHighlightDao;
    public static IMediaHighlightDao MediaHighlightDao
    {
        get { return _mediaHighlightDao ?? (_mediaHighlightDao = new MediaHighlightDao()); }
    }

    private static FolderManager _folderManager;
    public static FolderManager FolderManager
    {
        get { return _folderManager ?? (_folderManager = new FolderManager(ApiAccessMode.Admin)); }
    }

    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        string core = !String.IsNullOrEmpty(context.Request["core"]) ? context.Request["core"] : "offline";

        var metadata = new Dictionary<string, object>(1);
        var folderHighlights = GetHighlightsByFolderId();
        foreach (var f in folderHighlights)
        {
            metadata["folderId"] = f.Key;
            IndexManager.IndexHighlights(f.Value, metadata, core);
        }
        IndexManager.IndexCommit(core);
        context.Response.Write("Success");
    }

    private Dictionary<long, IEnumerable<MediaHighlight>> GetHighlightsByFolderId()
    {
        long highlightFolderId;
        if (!Int64.TryParse(ConfigurationManager.AppSettings["ektron.highlightFolderId"], out highlightFolderId))
        {
            return new Dictionary<long, IEnumerable<MediaHighlight>>();
        }

        //temporary hardcoded folderID for dev folder
        highlightFolderId = 471;

        FolderData highlightFolder = FolderManager.GetTree(highlightFolderId);
        if (highlightFolder == null )
        {
            return new Dictionary<long, IEnumerable<MediaHighlight>>();
        }


        // get highlights in highlights folder
        Dictionary<long, IEnumerable<MediaHighlight>> rv = new Dictionary<long, IEnumerable<MediaHighlight>>();
        var highlights = MediaHighlightDao.GetHighlights(highlightFolder.Id).ToList();
        rv.Add(highlightFolder.Id, highlights);

        //// in case there are folders within the highlights folder, get those too
        //foreach (var f in highlightFolder.ChildFolders)
        //{
        //    highlights = highlightDao.Gethighlights(f.Id).ToList();

        //    rv.Add(f.Id, highlights);
        //}

        return rv;

        //return highlightFolder.ChildFolders
        //    .ToDictionary(f => f.Id, f => highlightDao.Gethighlights(f.Id));
    }

    public bool IsReusable {
        get {
            return false;
        }
    }

}