DataColEnumerator 类

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.

继承层次结构

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

命名空间：  Microsoft.SqlServer.Dts.Runtime.Enumerators.ADO
程序集：  Microsoft.SqlServer.ForEachADOEnumerator（在 Microsoft.SqlServer.ForEachADOEnumerator.dll 中）

语法

声明
Public NotInheritable Class DataColEnumerator _
    Implements IEnumerator
用法
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 类型公开以下成员。

属性

	名称	说明
	Current	基础结构。Gets the current object in the collection.

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方法

	名称	说明
	Equals	（从 Object 继承。）
	GetHashCode	（从 Object 继承。）
	GetType	（从 Object 继承。）
	MoveNext	基础结构。Indicates whether the enumerator moves to the next element.
	Reset	基础结构。Resets the DataColEnumerator to its default configuration.
	ToString	（从 Object 继承。）

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注释

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.

线程安全

此类型的任何公共 static（在 Visual Basic 中为 Shared） 成员都是线程安全的。不保证所有实例成员都是线程安全的。

请参阅

参考

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