DataColEnumerator 類別

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

繼承階層

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

命名空間：  Microsoft.SqlServer.Dts.Runtime.Enumerators.ADO
組件：  Microsoft.SqlServer.ForEachADOEnumerator (在 Microsoft.SqlServer.ForEachADOEnumerator.dll 中)

語法

'宣告
Public NotInheritable Class DataColEnumerator _
    Implements IEnumerator
'用途
Dim instance As DataColEnumerator

public sealed class DataColEnumerator : IEnumerator

public ref class DataColEnumerator sealed : IEnumerator

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

public final class DataColEnumerator implements IEnumerator

DataColEnumerator 型別公開下列成員。

屬性

	名稱	說明
	Current	基礎結構。

上層

方法

	名稱	說明
	Equals	(繼承自 Object。)
	Finalize	(繼承自 Object。)
	GetHashCode	(繼承自 Object。)
	GetType	(繼承自 Object。)
	MemberwiseClone	(繼承自 Object。)
	MoveNext	基礎結構。
	Reset	基礎結構。
	ToString	(繼承自 Object。)

上層

備註

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 data column into the enumerator and iterate over it.

Vardisp.LockOneForWrite("VariableThatHadIndexSetToMinus1", vars)

DataColEnumerator dcEnum = (DataColEnumerator)vars[0]
foreach (object o in dcEnum)
{
    // 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.

執行緒安全性

這個型別的任何公用 static (在 Visual Basic 中為 Shared) 成員都是執行緒安全的。並不是所有的執行個體成員都保證可以用於所有的執行緒。

請參閱

參考

Microsoft.SqlServer.Dts.Runtime.Enumerators.ADO 命名空間