數據庫查詢foreach循環c＃

Question

我正在開發一些客戶端的工具，他們不想使用LINQ to SQL，他們也不想使用WPF，但我使用它，他們害怕到新的編碼或其他東西......但我不能與數據庫，因爲他們不知道任何關於LINQ ......所以他們給了我這個討厭的類（http://pastebin.com/VUzvN44i太長，粘貼在這裏，對不起）這是「好」當檢索行逐行...

但我有以下功能，這是完全與linq sql的功能，但我失去了他們給了我這個類...所以，如果有人可以給我一些建議如何在不修改課程的情況下做到這一點非常有幫助。謝謝。

private void GenerarFichero_Click(object sender, RoutedEventArgs e) 
{ 
    string valEmisora = "02827003"; 
    string codigoCabecera; 
    if (DateTime.Today.Day > 7) 
     codigoCabecera = "AE570200"; 
    else 
     codigoCabecera = "AE570100"; 
    DataBaseDataContext dc = new DataBaseDataContext(); 
    using (StreamWriter sw = new StreamWriter(codigoCabecera.Remove(6, 2))) 
    { 
     sw.WriteLine("775701 " + DateTime.Now.ToString("yy") + DateTime.Now.Month.ToString("d2") + DateTime.Now.AddDays(1).Day.ToString("d2") + DateTime.Now.Hour.ToString("d2") + DateTime.Now.Minute.ToString("d2") + "008910     00" + txtBanco.Text + codigoCabecera + txtBanco.Text + ""); 
     sw.WriteLine("0170  " + valEmisora + " " + this.txtBanco.Text + "   10" + DateTime.Now.ToString("MM") + DateTime.Now.ToString("yy")); 

     var OutputQuery = 
      from o in dc.Seguros 
      group o by o.emisora; 
     List<int> TotalRegistros = new List<int>(); 
     List<int> TotalSumas = new List<int>(); 
     foreach (var grupo in OutputQuery) 
     { 
      sw.WriteLine("0270  " + valEmisora + grupo.Key + " " + this.txtBanco.Text + "   10" + DateTime.Now.ToString("MM") + DateTime.Now.ToString("yy")); 
      List<int> Suma = new List<int>(); 
      foreach (var data in grupo) 
      { 
       Suma.Add(Convert.ToInt32(data.importe + data.importe_dec)); 
       sw.WriteLine("6070  " + valEmisora + data.emisora + "1" + data.banco + data.sucursal + data.fecha + data.importe + data.importe_dec + data.identificacion + "      " + data.referencia); 
      } 
      TotalRegistros.Add((grupo.Count() + 2)); 
      TotalSumas.Add(Suma.Sum()); 
      sw.WriteLine("8070  " + valEmisora + grupo.Key + " " + (grupo.Count() + 2).ToString().PadLeft(6, '0') + "  " + Suma.Sum().ToString().PadLeft(12, '0')); 
     } 
     sw.WriteLine("9070  " + valEmisora + " " + (TotalRegistros.Sum() + 2).ToString().PadLeft(6, '0') + "  " + TotalSumas.Sum().ToString().PadLeft(12, '0')); 
     this.txtTotal.Text = TotalSumas.Sum().ToString(); 
    } 
    MessageBox.Show("El fichero ha sido guardado, ya no se puede editar"); 
} 

Answer 1

好了，我最終代碼的工作，我把它換成OutputQuery與DataTable.AsEnumerable，實際上它是工作......這是現在的代碼如下

private void GenerarFichero_Click(object sender, RoutedEventArgs e) 
{ 
    string valEmisora = "02827003"; 
    string codigoCabecera; 
    if (DateTime.Today.Day > 7) 
     codigoCabecera = "AE570200"; 
    else 
     codigoCabecera = "AE570100"; 
    using (StreamWriter sw = new StreamWriter(codigoCabecera.Remove(6, 2))) 
    { 
     sw.WriteLine("775701 " + DateTime.Now.ToString("yy") + DateTime.Now.Month.ToString("d2") + DateTime.Now.AddDays(1).Day.ToString("d2") + DateTime.Now.Hour.ToString("d2") + DateTime.Now.Minute.ToString("d2") + "008910     00" + txtBanco.Text + codigoCabecera + txtBanco.Text + ""); 
     sw.WriteLine("0170  " + valEmisora + " " + this.txtBanco.Text + "   10" + DateTime.Now.ToString("MM") + DateTime.Now.ToString("yy")); 

     SelectBD sel = new SelectBD(App.ConexBD, "SELECT * FROM Seguros"); 
     var Query = sel.DataTable.AsEnumerable().Select(row => 
       { 
        return new  
        {  
         banco = row["banco"].ToString(), 
         emisora = row["emisora"].ToString(), 
         sucursal = row["sucursal"].ToString(), 
         fecha = row["fecha"].ToString(), 
         identificacion = row["identificacion"].ToString(), 
         importe = row["importe"].ToString(), 
         importe_dec = row["importe_dec"].ToString(), 
         provincia = row["provincia"].ToString(), 
         referencia = row["referencia"].ToString(), 
        }; 
       }); 
     var OutputQuery = Query.GroupBy(l => l.emisora); 
     List<int> TotalRegistros = new List<int>(); 
     List<int> TotalSumas = new List<int>(); 
     foreach (var grupo in OutputQuery) 
     { 
      sw.WriteLine("0270  " + valEmisora + grupo.Key + " " + this.txtBanco.Text + "   10" + DateTime.Now.ToString("MM") + DateTime.Now.ToString("yy")); 
      List<int> Suma = new List<int>(); 
      foreach (var data in grupo) 
      { 
       Suma.Add(Convert.ToInt32(data.importe + data.importe_dec)); 
       sw.WriteLine("6070  " + valEmisora + data.emisora + "1" + data.banco + data.sucursal + data.fecha + data.importe + data.importe_dec + data.identificacion + "      " + data.referencia); 
      } 
      TotalRegistros.Add((grupo.Count() + 2)); 
      TotalSumas.Add(Suma.Sum()); 
      sw.WriteLine("8070  " + valEmisora + grupo.Key + " " + (grupo.Count() + 2).ToString().PadLeft(6, '0') + "  " + Suma.Sum().ToString().PadLeft(12, '0')); 
     } 
     sw.WriteLine("9070  " + valEmisora + " " + (TotalRegistros.Sum() + 2).ToString().PadLeft(6, '0') + "  " + TotalSumas.Sum().ToString().PadLeft(12, '0')); 
     this.txtTotal.Text = TotalSumas.Sum().ToString(); 
    } 
    MessageBox.Show("El fichero ha sido guardado, ya no se puede editar"); 
} 

Answer 2

我不感到自豪我會說，但既然你迫切需要在這裏解決它去...... 與此有關的工作快速和骯髒的方法是：

var connection = InitalizeConnectionToDb(); 
var select = new SelectBD(); 
// Get the data from database 
select.Open(connection, @"select * from Seguros"); 
// Simulate the grouping 
var dictionary = new Dictionary<string, List<DataRow>>(); 
foreach(var row in select.DataTable) 
{ 
    var key = Convert.ToString(row["emisora"]); 
    if(!dictionary.ContainsKey(key)) 
    { 
     dictionary[key] = new List<DataRow>(); 
    } 
    dictionary[key].Add(row); 
} 

現在，您可以使用上面的字典來執行計算，因爲數據按emisora字段分組。