OleDbEnumerator.GetRootEnumerator 方法

public:
 static System::Data::OleDb::OleDbDataReader ^ GetRootEnumerator();

public static System.Data.OleDb.OleDbDataReader GetRootEnumerator();

static member GetRootEnumerator : unit -> System.Data.OleDb.OleDbDataReader

Public Shared Function GetRootEnumerator () As OleDbDataReader

傳回

OleDbDataReader A 包含可見 OLE DB 提供者的資訊。

例外狀況

範例

以下主控台應用程式會取得所有可見的 OLE DB 提供者資訊，並在主控台視窗中顯示這些資訊。

Imports System.Data  
Imports System.Data.OleDb  

Module Module1  

  Sub Main()  
    Dim enumerator As New OleDbEnumerator  
    Dim reader As OleDbDataReader = OleDbEnumerator.GetRootEnumerator()  

    DisplayData(reader)  

    Console.WriteLine("Press any key to continue.")  
    Console.ReadKey()  
  End Sub  

  Private Sub DisplayData(ByVal reader As OleDbDataReader)  
    While reader.Read()  
      For i As Integer = 0 To reader.FieldCount - 1  
        Console.WriteLine("{0} = {1}", _  
         reader.GetName(i), reader.GetValue(i))  
      Next  
      Console.WriteLine("==================================")  
    End While  

  End Sub  
End Module  

using System;  
using System.Data;  
using System.Data.OleDb;  

class Program  
{  
 static void Main()  
 {  
   OleDbDataReader reader = OleDbEnumerator.GetRootEnumerator();  

   DisplayData(reader);  

   Console.WriteLine("Press any key to continue.");  
   Console.ReadKey();  
 }  

 static void DisplayData(OleDbDataReader reader)  
 {  
   while (reader.Read())  
   {  
     for (int i = 0; i < reader.FieldCount; i++)  
     {  
       Console.WriteLine("{0} = {1}",  
        reader.GetName(i), reader.GetValue(i));  
     }  
     Console.WriteLine("==================================");  
   }  
 }  
}  

備註

此方法回傳的讀取器包含以下欄位，全部皆包含字串：