ConcatオペレータでLinqクエリに失敗しました

Question

私は銀行システムを開発しようとしています。 3つのテーブルレコードを1つのテーブルに結合しようとしています。しかし、問題は私がそれをコンパイルするときに私は次のエラーがあります。

エラーCS1929 'IEnumerableを<>' 'の連結方式の' と最高の拡張メソッドのオーバーロードの定義が含まれていません 'Queryable.Concat <>（IQueryableを<>、IEnumerableを<は>'）のIQueryable「タイプの受信機が必要です<>

ここにLinqクエリがあります。ここで

public string TranscationDetails(string Account_Number) 
     { 

      var accountNumber = int.Parse(Account_Number);//It could be better to use TryParse 
      using (HalifaxDatabaseEntities context = new HalifaxDatabaseEntities()) 
      { 
       var q1 = context.Current_Account_Deposit.Where(x => x.Account_Number == accountNumber).Select(w => new 
       { 
        w.Account_Number, 
        Deposit = (decimal?)null, 
        Withdrawal = (decimal?)w.Amount, 
        w.Date 
       }).ToList(); 

       var q2 = context.Current_Account_Withdraw.Select(d => new 
       { 
        d.Account_Number, 
        Deposit = (decimal?)d.Amount, 
        Withdrawal = (decimal?)null, 
        d.Date 
       }).OrderBy(r => r.Date).ToList(); 

       var q3 = context.Current_Account_Details.Select(e => new 
       { 
        //You should perform same anonymous type which you want to concat 
        Account_Number = e.Account_Number, 
        Deposit = (decimal?)e.Account_Balance, 
        Withdrawal = (decimal?)null, 
        e.Account_Fees 
       }).ToList(); 

       var inOut = q1.Concat(q2).Concat(q3).ToList();**//Error on this line** 



       var js = new System.Web.Script.Serialization.JavaScriptSerializer(); 

       return js.Serialize(inOut); // return JSON string 
      } 
     } 

ここでは、データベースのレコード

はモデルクラスです。

Answer 1

public string TranscationDetails(string Account_Number) 
     { 

      var accountNumber = int.Parse(Account_Number);//It could be better to use TryParse 
      List<AccountTransaction> accountTransactions = new List<AccountTransaction>(); 
      using (HalifaxDatabaseEntities context = new HalifaxDatabaseEntities()) 
      { 
       accountTransactions.AddRange(context.Current_Account_Deposit.Where(x => x.Account_Number == accountNumber).Select(w => new AccountTransaction 
       { 
        AccountNumber = w.Account_Number, 
        Deposit = 0, 
        Withdrawal = w.Amount, 
        Date = w.Date, 
        Fee = 0 
       }).ToList()); 

       accountTransactions.AddRange(context.Current_Account_Withdraw.Select(d => new AccountTransaction 
       { 
        AccountNumber = d.Account_Number, 
        Deposit = d.Amount, 
        Withdrawal = 0, 
        Date = d.Date, 
        Fee = 0 
       }).OrderBy(r => r.Date).ToList()); 

       accountTransactions.AddRange(context.Current_Account_Details.Select(e => new AccountTransaction 
       { 
        //You should perform same anonymous type which you want to concat 
        AccountNumber = e.Account_Number, 
        Deposit = e.Account_Balance, 
        Withdrawal = 0, 
        Date = null, 
        Fee = e.Account_Fees 
       }).ToList()); 

       var inOut = accountTransactions; 



       var js = new System.Web.Script.Serialization.JavaScriptSerializer(); 

       return js.Serialize(inOut); // return JSON string 
      } 
     } 

public class AccountTransaction 
{ 
    public int AccountNumber { get; set; } 
    public decimal Deposit { get; set; } 
    public decimal Withdrawal { get; set; } 
    public string Date{ get; set; } 
    public decimal Fee { get; set; } 
}