WarningEnumerator.Current 属性

定义

命名空间:

Microsoft.SqlServer.Dts.Runtime

程序集:

Microsoft.SqlServer.ManagedDTS.dll

从集合中获取当前 DtsWarning 对象。

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

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

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

Public ReadOnly Property Current As DtsWarning

属性值

DtsWarning

当前 DtsWarning 对象。

示例

以下代码示例是将任务添加到一个包中，然后运行该包。 警告集合通过创建 WarningEnumerator 并显示每个警告描述来显示。

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

namespace Microsoft.SqlServer.SSIS.Samples  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            Package package = new Package();  
            Console.WriteLine("Package warnings count before running: {0}", package.Warnings.Count);  

            TaskHost taskH2 = (TaskHost)package.Executables.Add("STOCK:SendMailTask");  
            taskH2.FailPackageOnFailure = false;  
            taskH2.FailParentOnFailure = false;  
            Console.WriteLine("SendMailTask: {0}", taskH2.ID);  

            // Test that warnings were successfully added to the collection.  
            package.MaximumErrorCount = 100;  
            package.FailPackageOnFailure = false;  
            package.FailParentOnFailure = false;  
            package.DelayValidation = true;  
            package.Execute();  

            Console.WriteLine("Package warnings count after running the package: {0}", package.Warnings.Count);  

            // Create the enumerator.  
            WarningEnumerator myEnumerator = package.Warnings.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.Description);  
        }  
    }  
}  

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

Namespace Microsoft.SqlServer.SSIS.Samples  
    Class Program  
        Shared  Sub Main(ByVal args() As String)  
            Dim package As Package =  New Package()   
            Console.WriteLine("Package warnings count before running: {0}", package.Warnings.Count)  

            Dim taskH2 As TaskHost = CType(package.Executables.Add("STOCK:SendMailTask"), TaskHost)  
            taskH2.FailPackageOnFailure = False  
            taskH2.FailParentOnFailure = False  
            Console.WriteLine("SendMailTask: {0}", taskH2.ID)  

            ' Test that warnings were successfully added to the collection.  
            package.MaximumErrorCount = 100  
            package.FailPackageOnFailure = False  
            package.FailParentOnFailure = False  
            package.DelayValidation = True  
            package.Execute()  

            Console.WriteLine("Package warnings count after running the package: {0}", package.Warnings.Count)  

            ' Create the enumerator.  
            Dim myEnumerator As WarningEnumerator =  package.Warnings.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  

示例输出：

包裹警告在运行前计数：0

SendMailTask： {34CAEFF9-64BF-401D-B646-C88B705DB971}

包裹警告在运行包后计入：2

该集合包含以下数值：

[0] 发件人行中的地址未正确生成。 缺少@或无效。

[1] 主语为空

注解

在创建枚举子或调用 Reset 该方法后，必须调用该 MoveNext 方法将枚举子推进到集合的第一个元素，枚举器才能读取属性的 Current 值;否则， Current 为未定义并抛出异常。

Current 如果最后一次调用 MoveNext 返回 false，则也会引发异常，这表示集合的末尾。

Current 不会移动枚举器的位置，连续调用 返回 Current 同一对象，直到 MoveNext 被调用 或 Reset 。

只要集合保持不变，枚举器就保持有效。 如果对集合进行了更改，比如添加、修改或删除元素，枚举器将失效并无法恢复;因此，下一次调用 MoveNext 或 Reset 会抛出 InvalidOperationException。 如果集合在调用和MoveNextCurrent之间被修改，Current则返回其设定的元素，即使枚举器已被失效。