DataTable.CreateDataReader DataTable.CreateDataReader DataTable.CreateDataReader DataTable.CreateDataReader Method

정의

DataTableReader의 데이터에 해당하는 DataTable를 반환합니다.Returns a DataTableReader corresponding to the data within this DataTable.

public:
 System::Data::DataTableReader ^ CreateDataReader();
public System.Data.DataTableReader CreateDataReader ();
member this.CreateDataReader : unit -> System.Data.DataTableReader
Public Function CreateDataReader () As DataTableReader

반환

결과 집합 하나를 포함하고 소스 DataTableReader 인스턴스에 해당하는 DataTable입니다.A DataTableReader containing one result set, corresponding to the source DataTable instance.

예제

다음 콘솔 애플리케이션에서는 DataTable 인스턴스를 만듭니다.The following console application creates a DataTable instance. 예제는 다음 채워진 전달 DataTable 호출 된 프로시저에는 CreateDataReader 내에 포함 된 결과 반복 하는 메서드를 DataTableReader.The example then passes the filled DataTable to a procedure that calls the CreateDataReader method, which iterates through the results contained within the DataTableReader.

static void Main()
{
    TestCreateDataReader(GetCustomers());
    Console.WriteLine("Press any key to continue.");
    Console.ReadKey();
}

private static void TestCreateDataReader(DataTable dt)
{
    // Given a DataTable, retrieve a DataTableReader
    // allowing access to all the tables' data:
    using (DataTableReader reader = dt.CreateDataReader())
    {
        do
        {
            if (!reader.HasRows)
            {
                Console.WriteLine("Empty DataTableReader");
            }
            else
            {
                PrintColumns(reader);
            }
            Console.WriteLine("========================");
        } while (reader.NextResult());
    }
}

private static DataTable GetCustomers()
{
    // Create sample Customers table, in order
    // to demonstrate the behavior of the DataTableReader.
    DataTable table = new DataTable();

    // Create two columns, ID and Name.
    DataColumn idColumn = table.Columns.Add("ID", typeof(int));
    table.Columns.Add("Name", typeof(string));

    // Set the ID column as the primary key column.
    table.PrimaryKey = new DataColumn[] { idColumn };

    table.Rows.Add(new object[] { 1, "Mary" });
    table.Rows.Add(new object[] { 2, "Andy" });
    table.Rows.Add(new object[] { 3, "Peter" });
    table.Rows.Add(new object[] { 4, "Russ" });
    return table;
}

private static void PrintColumns(DataTableReader reader)
{
    // Loop through all the rows in the DataTableReader
    while (reader.Read())
    {
        for (int i = 0; i < reader.FieldCount; i++)
        {
            Console.Write(reader[i] + " ");
        }
        Console.WriteLine();
    }
}
Sub Main()
  TestCreateDataReader(GetCustomers())
  Console.WriteLine("Press any key to continue.")
  Console.ReadKey()
End Sub

Private Sub TestCreateDataReader(ByVal dt As DataTable)
  ' Given a DataTable, retrieve a DataTableReader
  ' allowing access to all the tables's data:
  Using reader As DataTableReader = dt.CreateDataReader()
    Do
      If Not reader.HasRows Then
        Console.WriteLine("Empty DataTableReader")
      Else
        PrintColumns(reader)
      End If
      Console.WriteLine("========================")
    Loop While reader.NextResult()
  End Using
End Sub

Private Function GetCustomers() As DataTable
  ' Create sample Customers table, in order
  ' to demonstrate the behavior of the DataTableReader.
  Dim table As New DataTable

   ' Create two columns, ID and Name.
  Dim idColumn As DataColumn = table.Columns.Add("ID", GetType(Integer))
  table.Columns.Add("Name", GetType(String))

  ' Set the ID column as the primary key column.
  table.PrimaryKey = New DataColumn() {idColumn}

  table.Rows.Add(New Object() {1, "Mary"})
  table.Rows.Add(New Object() {2, "Andy"})
  table.Rows.Add(New Object() {3, "Peter"})
  table.Rows.Add(New Object() {4, "Russ"})
  Return table
End Function

Private Sub PrintColumns( _
   ByVal reader As DataTableReader)

  ' Loop through all the rows in the DataTableReader.
  Do While reader.Read()
    For i As Integer = 0 To reader.FieldCount - 1
      Console.Write(reader(i).ToString() & " ")
    Next
    Console.WriteLine()
  Loop
End Sub

이 예제에서는 콘솔 창에 다음 출력을 표시합니다.The example displays the following output in the console window:

1 Mary

2 Andy

3 Peter

4 Russ

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