如何將數據讀取器中的數據讀入數據表？

我有ado.net操作的基類，看起來像這樣：如何將數據讀取器中的數據讀入數據表？

public abstract class BaseDataAccess 
    { 
     private string _connectionString = ...... 

     protected string ConnectionString 
     { 
      get { return _connectionString; } 
     } 

     protected object ExecuteScalar(string spName, SqlParameter[] parameters=null) 
     { 
      using (SqlConnection connection = new SqlConnection(_connectionString)) 
      { 
       using (SqlCommand command = new SqlCommand(spName, connection)) 
       { 
        if (parameters != null) 
        { 
         command.Parameters.AddRange(parameters); 
        } 
        command.CommandType = System.Data.CommandType.StoredProcedure; 
        connection.Open(); 
        return command.ExecuteScalar(); 
       } 
      }    
     } 

     protected DataTable ExecuteReader(string spName, SqlParameter[] parameters=null) 
     { 
      using (SqlConnection connection = new SqlConnection(_connectionString)) 
      { 
       using (SqlCommand command = new SqlCommand(spName, connection)) 
       { 
        if (parameters != null) 
        { 
         command.Parameters.AddRange(parameters); 
        } 
        command.CommandType = CommandType.StoredProcedure; 
        connection.Open(); 
        using (SqlDataReader reader = command.ExecuteReader()) 
        { 
         DataTable table = new DataTable();       
         table.Load(reader); 
         return table; 
        } 
       } 
      } 
     } 
    }

而且，查詢用戶表類

public class UsersAccess : BaseDataAccess 
    { 
     private const string SP_COUNT_USERS = "spCountUsers"; 
     private const string SP_GET_USERS = "spGetUsers"; 

     public int CountUsers() 
     { 
      return (int)base.ExecuteScalar(SP_COUNT_USERS); 
     } 

     public IList<User> GetUsers() 
     { 
      DataTable usersTable = base.ExecuteReader(SP_GET_USERS); 
      return GetUsersFromDataTable(usersTable); 
     } 

     private IList<User> GetUsersFromDataTable(DataTable usersTable) 
     { 
      IList<User> users = new List<User>(); 
      foreach (DataRow row in usersTable.Rows) 
      { 
       User user = new User(); 
       user.UserID = (int)row["UserID"]; 
       user.Password = (string)row["Password"]; 
       user.Username = (string)row["Username"]; 
      } 
      return users; 
     } 
    }

數據讀取器配有2行數據，但當沒有數據進入數據表時。如何做到這一點？

PS：對於更好的ado.net基類，任何提示都會很棒。我只有幾張桌子，只有很少的程序/桌子。

來源

2012-08-09 gigi

你可以嘗試DataAdapter.Fill方法方法結束，雖然我沒有看到一個很好的理由，爲什麼你當前的代碼不起作用。（http://msdn.microsoft.com/en-us/library/497b1k4t.aspx） – 2012-08-09 20:52:23

缺少的users.Add(user);在每個循環

private IList<User> GetUsersFromDataTable(DataTable usersTable) 
    { 
     IList<User> users = new List<User>(); 
     foreach (DataRow row in usersTable.Rows) 
     { 
      User user = new User(); 
      user.UserID = (int)row["UserID"]; 
      user.Password = (string)row["Password"]; 
      user.Username = (string)row["Username"]; 
      users.Add(user); 
     } 
     return users; 
    }

來源

2012-08-09 20:53:36 Steve

哦，我的上帝。我是一個白癡。謝謝 – gigi 2012-08-09 20:55:27

如何將數據讀取器中的數據讀入數據表？

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