Concat 연산자로 Linq 쿼리를 수행하지 못했습니다.

Question

나는 뱅킹 시스템을 개발하려고합니다. 세 개의 테이블 레코드를 단일 테이블에 조인하려고했습니다. 하지만 문제는 내가 컴파일 할 때 나는 다음과 같은 오류가있다.

오류 CS1929 '는 IEnumerable <>는' 'CONCAT'에 대한 정의와 'Queryable.Concat <> (된 IQueryable <>, IEnumerable을 <이>)'타입의 수신기가 필요합니다 '최고의 확장 메서드 오버로드를 포함하지 않는 된 IQueryable <>

다음은 Linq 쿼리입니다. 여기

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 
      } 
     } 

는 데이터베이스 레코드 여기

모델 클래스입니다.

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; } 
}