从List <KeyValuePair <string,string >>返回匹配

Question

我目前有一个类使用KeyValuePairwith List来存储Key = track,Value = artist格式的音轨集合.

我正在尝试提供一种搜索特定曲目的方法,如果有任何匹配,则返回整个匹配的CD.

这是我到目前为止的尝试:

public CompilationCD FindTrackInComCD(string track)
{
    CompilationCD temp = new CompilationCD();

    List<CD> tempComCols = _cdCollection.FindAll(delegate(CD cd)
    { return cd.GetType() == temp.GetType(); });

    foreach (KeyValuePair<string, string> comCD in tempComCols)
    {
        if (comCD.Key.Contains(track))
        {
            return comCD;
        }
    }

    throw new ArgumentException("No matches found");
}

我有一个CD类型的CD集合,List<CD>因此我List<>通过将它与临时列表进行比较来创建一个新的适当类型.

编译时我收到以下错误:

Cannot convert type 'CDCollection.CD' to System.Collections.Generic.KeyValuePair<string,string>'

Cannot implicitly convert type 'System.Collections.Generic.KeyValuePair<string,string>'

(CDCollection是我的项目命名空间,CD/CompilationCD是类)

对不起,这似乎与我之前提出过的问题类似.我尝试使用之前给出的方法,但我有点难过; 我没有用List<>或者KeyValuePair非常频繁.

这是CD类:

using System;

使用System.Collections; 使用System.Collections.Generic; 使用System.Linq; 使用System.Text;

namespace CDCollection {public class CD {#region Fields private readonly string _artist; private readonly string _album; private List _track = new List(); #endregion

    #region Constructors
    public CD()
    {
        _artist = "";
        _album = "";
        _track = null;
    }

    public CD(string albumName)
    {
        _album = albumName;
    }

    public CD(string artistName, string albumName)
    {
        _artist = artistName;
        _album = albumName;
    }

    #endregion

    #region Properties
    /// <summary>
    /// Get/Set Artist Name
    /// </summary>
    public virtual string Artist
    {
        get
        {
            return _artist;
        }
        set
        {
            value = _artist;
        }
    }

    /// <summary>
    /// Get/Set Album
    /// </summary>
    public string Album
    {
        get
        {
            return _album;
        }
        set
        {
            value = _album;
        }
    }

    /// <summary>
    /// Get/Set Track Name
    /// </summary>
    public virtual List<string> Track
    {
        get
        {
            return _track;
        }
        set
        {
            value = _track;
        }
    }

    #endregion

    #region ToString()
    /// <summary>
    /// Custom ToString() Method
    /// </summary>
    /// <returns></returns>
    public override string ToString()
    {
        //Create new StringBuilder object
        StringBuilder sb = new StringBuilder();

        sb.Append("Artist Name");

        //Display error if Artist is not available
        if (_artist == null || _artist == "")
        {
            sb.Append("\nNo Artist Entered");
        }
        else
        {
            sb.Append("\n" + this._artist);
        }

        sb.Append("\n");
        sb.Append("\nAlbum Name");

        //Display error if Album is not available
        if (_album == null || _album == "")
        {
            sb.Append("\nNo Album Entered");
        }
        else
        {
            sb.Append("\n" + this._album);
        }

        sb.Append("\n");
        sb.Append("\nTrack Name");
        sb.Append("\n");

        //Iterate through all tracks stored in list
        foreach (string trackName in _track)
        {
            //Print each artist
            sb.Append("\n" + trackName);
        }

        sb.Append("\nEnd of CD Record.........");

        return sb.ToString();
    }

    #endregion
}

}

这是CompilationCD类:

using System;

使用System.Collections.Generic; 使用System.Linq; 使用System.Text;

namespace CDCollection {public class CompilationCD:CD {#region Fields

    private readonly string _artist;
    private readonly string _album;
    private List<KeyValuePair<string,string>> _tracks = new List<KeyValuePair<string,string>>();

    //List<KeyValuePair> Reference.
    //http://msdn.microsoft.com/en-us/library/6sh2ey19(VS.85).aspx

    #endregion

    #region Constructors

    public CompilationCD()
    {
        _album = "";
        _artist = "Various Artists";
    }

    public CompilationCD(string albumName):base(albumName)
    {
        _album = albumName;
        _artist = "Various Artists";
    }

    #endregion

    public void AddTracks(string track, string artist)
    {
        _tracks.Add(new KeyValuePair<string, string>(track, artist));
    }

    #region Properties

    public override string Artist
    {
        get
        {
            return this._artist;
        }
    }

    public new List<KeyValuePair<string,string>> Track
    {
        get
        {
            return _tracks;
        }
        set
        {
            _tracks = value;
        }
    }


    #endregion

    #region ToString()

    //TEST
    public override string ToString()
    {
        //Create new StringBuilder object
        StringBuilder sb = new StringBuilder();

        sb.Append("Artist Name");

        //Display error if Artist is not available
        if (_artist == null || _artist == "")
        {
            sb.Append("\nNo Artist Entered");
        }
        else
        {
            sb.Append("\n" + this._artist);
        }

        sb.Append("\n");
        sb.Append("\nAlbum Name");

        //Display error if Album is not available
        if (base.Album == null || base.Album == "")
        {
            sb.Append("\nNo Album Entered");
        }
        else
        {
            sb.Append("\n" + base.Album);
        }

        sb.Append("\n");
        sb.Append("\nTrack Name");
        sb.Append("\n");

        ////Iterate through all tracks stored in list
        //foreach (string trackName in base.Track)
        //{
        //    //Print each artist
        //    sb.Append("\n" + trackName);
        //}

        for(int i = 0; i <= _tracks.Count; i++)
        {
            string track = _tracks[i].Key;
            string artist = _tracks[i].Value;

            sb.Append("\nTrack");
            sb.Append(track);
            sb.Append("\nArtist");
            sb.Append(artist);
        }

        sb.Append("\nEnd of Compilation CD Record.........");

        return sb.ToString();
    }

    #endregion
}

}

我有严格的规则意味着我必须继承CD以创建我的CompilationCD以及使用List>作为我的轨道集合,它需要同时拥有一个轨道和艺术家.疯了我知道= /

此外,我必须将所有类型的CD存储在CD(List)类型的列表中.

Answer 1

为什么不用字典？它们是键值对的列表,但可通过键轻松访问.