linq結果セットをカスタムタイプとして返​​すにはどうすればいいですか？

Question

public class LearnerInfo 
{ 
    public string Id { get; set; } 
    public string Name { get; set; } 


    public LearnerInfo(string id, string name) 
    { 
     this.Id = id; 
     this.Name = name; 
    } 
} 


public class LearnerCourse 
{ 
    public string Id { get; set; } 
    public string ExpiredCount { get; set; } 
    public string Soonduecount { get; set; } 
    public string Currentmonthcount { get; set; } 
    public string Currentmonthplus1count { get; set; } 
    public string Currentmonthplus2count { get; set; } 
    public string Currentmonthplus3count { get; set; } 
    public string Currentmonthplus4count { get; set; } 
    public string Currentmonthplus5count { get; set; } 
    public string Subtotal { get; set; } 


    public LearnerCourse(string id, string exp, string soonDue, string current, string plus1, string plus2, 
     string plus3, string plus4, string plus5) 
    { 
     this.Id = id; 
     this.ExpiredCount = exp; 
     this.Soonduecount = soonDue; 
     this.Currentmonthcount = current; 
     this.Currentmonthplus1count = plus1; 
     this.Currentmonthplus2count = plus2; 
     this.Currentmonthplus3count = plus3; 
     this.Currentmonthplus4count = plus4; 
     this.Currentmonthplus5count = plus5; 
    } 


    public LearnerCourse() 
    { } 
} 

public class InfoList : IEnumerable<CombinedInfo> 
{ 

    private List<CombinedInfo> _infoList = new List<CombinedInfo>(); 

    public InfoList() 
    { 
     _infoList = new List<CombinedInfo>(); 
    } 


    public void Add(CombinedInfo i) 
    { 
     _infoList.Add(i); 
    } 


    public IEnumerator<CombinedInfo> GetEnumerator() 
    { 
     return _infoList.GetEnumerator(); 
    } 


    //IEnumerable Members 
    System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() 
    { 
     throw new NotImplementedException(); 
    } 
} 


public class CombinedInfo 
{ 
    public string Id { get; set; } 
    public string ExpiredCount { get; set; } 
    public string Soonduecount { get; set; } 
    public string Currentmonthcount { get; set; } 
    public string Currentmonthplus1count { get; set; } 
    public string Currentmonthplus2count { get; set; } 
    public string Currentmonthplus3count { get; set; } 
    public string Currentmonthplus4count { get; set; } 
    public string Currentmonthplus5count { get; set; } 
    public string Name { get; set; } 
} 


    static void Main(string[] args) 
    { 
     LearnerCourse lc1 = new LearnerCourse("777", "1", "1", "0", "1", "0", "0", "0", "0"); 
     LearnerCourse lc2 = new LearnerCourse("589", "1", "0", "0", "0", "0", "0", "0", "0"); 

     LearnerInfo li1 = new LearnerInfo("777", "moe"); 
     LearnerInfo li2 = new LearnerInfo("589", "larry"); 

     LearnerCourse[] lCourses = new LearnerCourse[2]; 
     lCourses[0] = lc1; 
     lCourses[1] = lc2; 

     LearnerInfo[] linfos = new LearnerInfo[2]; 
     linfos[0] = li1; 
     linfos[1] = li2; 


     //test linq join for object array 
     var myJoin = (from c in lCourses 
        join i in linfos on c.Id equals i.Id 
        select new { 
         c.ExpiredCount, 
         c.Soonduecount, 
         c.Currentmonthcount, 
         c.Currentmonthplus1count, 
         c.Currentmonthplus2count, 
         c.Currentmonthplus3count, 
         c.Currentmonthplus4count, 
         c.Currentmonthplus5count, 
         c.Subtotal, 
         i.Id, 
         i.Name 
        }); 


     foreach (CombinedInfo o in l) 
     { 
      //loop through and can add to list of type CombinedInfo 
     } 
} 

foreachループを実行する代わりに、linqクエリから結果セットを取得してListを返すだけの問題があります。

提案はありますか？

Answer 1

2つのこと：カスタムクラスへ

a）のプロジェクトではなく、匿名型。あなたの場合はすでにCombinedInfoが定義されています - それを使用してください。

b）の実行を強制し、List<T>

var list = (from c in lCourses 
      join i in linfos on c.Id equals i.Id 
      select new CombinedInfo() { 
       ExpiredCount = c.ExpiredCount, 
       Soonduecount = c.Soonduecount, 
       Currentmonthcount = c.Currentmonthcount, 
       Currentmonthplus1count = c.Currentmonthplus1count, 
       Currentmonthplus2count = c.Currentmonthplus2count, 
       Currentmonthplus3count = c.Currentmonthplus3count, 
       Currentmonthplus4count = c.Currentmonthplus4count, 
       Currentmonthplus5count = c.Currentmonthplus5count, 
       Subtotal = c.Subtotal, 
       Id = i.Id, 
       Name = i.Name 
      }).ToList();