RunningPackagesEnumerator.Current 属性

定义

命名空间:

Microsoft.SqlServer.Dts.Runtime

程序集:

Microsoft.SqlServer.ManagedDTS.dll

从集合返回当前的 RunningPackage 对象。

public:
 property Microsoft::SqlServer::Dts::Runtime::RunningPackage ^ Current { Microsoft::SqlServer::Dts::Runtime::RunningPackage ^ get(); };

public Microsoft.SqlServer.Dts.Runtime.RunningPackage Current { get; }

member this.Current : Microsoft.SqlServer.Dts.Runtime.RunningPackage

Public ReadOnly Property Current As RunningPackage

属性值

RunningPackage

RunningPackage 对象。

示例

下面的代码示例创建一个枚举器来循环访问正在运行的包。

using System;  
using System.Collections.Generic;  
using System.Text;  
using Microsoft.SqlServer.Dts.Runtime;  

namespace RunningPackages  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            Application app = new Application();  
            RunningPackages pkgs = app.GetRunningPackages("YOURSERVER");  

            int pkgsRunning = pkgs.Count;  
            Console.WriteLine("Packages before stop: " + pkgsRunning);  

            // Get the RunningPackages collection from the package.  
            RunningPackages runPkgs = app.GetRunningPackages("YOURSERVER ");  

            //Create the Enumerator.  
            RunningPackagesEnumerator myEnumerator = runPkgs.GetEnumerator();  

            Console.WriteLine("The collection contains the following values:");  
            int i = 0;  
            while ((myEnumerator.MoveNext()) && (myEnumerator.Current != null))  
            Console.WriteLine("[{0}] {1}", i++, myEnumerator.Current.PackageDescription);  
        }  
    }  
}  

Imports System  
Imports System.Collections.Generic  
Imports System.Text  
Imports Microsoft.SqlServer.Dts.Runtime  

Namespace RunningPackages  
    Class Program  
        Shared  Sub Main(ByVal args() As String)  
            Dim app As Application =  New Application()   
            Dim pkgs As RunningPackages =  app.GetRunningPackages("YOURSERVER")   

            Dim pkgsRunning As Integer =  pkgs.Count   
            Console.WriteLine("Packages before stop: " + pkgsRunning)  

            ' Get the RunningPackages collection from the package.  
            Dim runPkgs As RunningPackages =  app.GetRunningPackages("YOURSERVER ")   

            'Create the Enumerator.  
            Dim myEnumerator As RunningPackagesEnumerator =  runPkgs.GetEnumerator()   

            Console.WriteLine("The collection contains the following values:")  
            Dim i As Integer =  0   
            While (myEnumerator.MoveNext()) &&(myEnumerator.Current <> Nothing)  
            Console.WriteLine("[{0}] {1}",i = Console.WriteLine("[{0}] {1}",i + 1  
            End While  
        End Sub  
    End Class  
End Namespace  

注解

创建枚举器或调用 Reset 方法后， MoveNext 必须调用该方法，以便将枚举器提升到集合的第一个元素，然后枚举器才能读取属性的值 Current ;否则， Current 未定义并引发异常。

Current如果最后一次调用返回false，则还会引发异常，该调用MoveNext指示集合的末尾。

Current 不会移动枚举器的位置，并且连续调用以 Current 返回同一对象，直到 MoveNext 调用或 Reset 调用。

只要集合保持不变，枚举器就仍有效。 如果对集合进行了更改（如添加、修改或删除元素），则枚举器将失效并变为不可恢复;因此，下一次调用 MoveNext 或 Reset 引发一个 InvalidOperationException。 但是，如果在调用和Current调用MoveNext之间修改集合，Current则返回它设置为的元素，即使枚举器已失效。