Класс FieldColEnumerator

This class is used when the ADO enumerator returns a Dataset or Recordset. This enumerator allows you to enumerate over the fields. This class cannot be inherited.

Пространство имен:  Microsoft.SqlServer.Dts.Runtime.Enumerators.ADO
Сборка:  Microsoft.SqlServer.ForEachADOEnumerator (в Microsoft.SqlServer.ForEachADOEnumerator.dll)

Синтаксис

'Декларация
Public NotInheritable Class FieldColEnumerator _
    Implements IEnumerator
'Применение
Dim instance As FieldColEnumerator

public sealed class FieldColEnumerator : IEnumerator

public ref class FieldColEnumerator sealed : IEnumerator

[<SealedAttribute>]
type FieldColEnumerator =  
    class
        interface IEnumerator
    end

public final class FieldColEnumerator implements IEnumerator

Замечания

The members of this class cannot be used directly. This class is used by the foreach keyword (For Each in Visual Basic). The following code example is a piece of a foreach loop showing simply how to use indexing to place a field into the enumerator and iterate over it.

Vardisp.LockOneForWrite("VariableThatHadIndexSetToMinus1", vars)

FieldColEnumerator fEnum = (FieldColEnumerator)vars[0]
foreach (object o in fEnum)
{
    // Do something with o, 
    // where o is the value of the column, just as you would get
    // if you had a variable for a specific index.
}

You must set the index for the variable mapping to -1 to retrieve the entire collection into the variable, instead of retrieving just a column which is based on an index, so then you can access it directly.

Иерархия наследования

System. . :: . .Object
  Microsoft.SqlServer.Dts.Runtime.Enumerators.ADO..::..FieldColEnumerator

Потоковая защита

Все открытые статический (Shared в Visual Basic) элементы этого типа потокобезопасны. Потокобезопасность элементов экземпляров не гарантируется.

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