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Devart.Data.SqlServer Namespace / SqlDataReader Class / FieldCount Property
Example

In This Topic
    FieldCount Property (SqlDataReader)
    In This Topic
    Gets the number of columns in the current row.
    Syntax
    'Declaration
     
    Public Overrides ReadOnly Property FieldCount As Integer
    public override int FieldCount {get;}

    Property Value

    When not positioned in a valid record set, 0; otherwise the number of columns in the current record. The default value is -1.
    Remarks
    After executing a query that does not return rows, FieldCount returns 0.
    Example
    This sample demonstrates how to iterate through fields in a row using FieldCount property.
    public void FetchResults(SqlConnection myConnection)
    {
      SqlCommand cmd = new SqlCommand("SELECT * FROM Test.Dept");
      cmd.FetchSize = 100;
      cmd.Connection = myConnection;
      myConnection.Open();
      try
      {
        SqlDataReader reader = cmd.ExecuteReader();
        while (reader.Read())
        {
          for (int i=0;i<reader.FieldCount;i++)
          {
            Console.Write("\t"+reader[i]);
          }
          Console.WriteLine();
        }
      }
      finally
      {
        myConnection.Close();
      }
    }
    Public Sub FetchResults(ByVal myConnection As SqlConnection)
      Dim cmd As SqlCommand = New SqlCommand("SELECT * FROM Test.Dept")
      cmd.FetchSize = 100
      cmd.Connection = myConnection
      myConnection.Open()
      Try
        Dim reader As SqlDataReader = cmd.ExecuteReader()
        While reader.Read()
          Dim i
          For i = 0 To reader.FieldCount - 1
            Console.Write(String.Concat(" ", reader(i)))
          Next i
          Console.WriteLine()
        End While
      Finally
        myConnection.Close()
      End Try
    End Sub
    Requirements

    Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

    See Also