SSIS 脚本任务错误信息

Question

我在运行SSIS 包时收到以下错误消息。脚本任务使用Microsoft Visual C# 2008。你能帮我解决这个问题吗？

非常感谢！我还附上了错误信息：

Error: 2015-12-22 02:58:08.28
   Code: 0x00000001
   Source: Script Task 
   Description: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation. Specify the ServiceNotification or DefaultDesktopOnly style to display a notification from a service application.
   at System.Windows.Forms.MessageBox.ShowCore(IWin32Window owner, String text, String caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions options, Boolean showHelp)
   at System.Windows.Forms.MessageBox.Show(String text)
   at ST_d27b216cd7d64713b54c81f6ac28d805.csproj.ScriptMain.Main()
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
   at System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)
   at System.Type.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args, CultureInfo culture)
   at Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTATaskScriptingEngine.ExecuteScript()
End Error
DTExec: The package execution returned DTSER_FAILURE (1).

C#代码：

using System;
using System.Data;
using Microsoft.SqlServer.Dts.Runtime;
using System.Windows.Forms;

namespace ST_d27b216cd7d64713b54c81f6ac28d805.csproj
{
    [System.AddIn.AddIn("ScriptMain", Version = "1.0", Publisher = "", Description = "")]
    public partial class ScriptMain : Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTARTScriptObjectModelBase
    {

        #region VSTA generated code
        enum ScriptResults
        {
            Success = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Success,
            Failure = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Failure
        };
        #endregion

        public void Main()
        {
            // TODO: Add your code here
            System.IO.FileInfo fi;
            String FilePath = null;

            DateTime ModifiedTime = (DateTime)Dts.Variables["File_Modified"].Value;


            DateTime LoadDate = (DateTime)Dts.Variables["File_Last_Load_Date"].Value;

            Dts.Variables["isModified"].Value = false;


            FilePath = Dts.Variables["SourceFolder"].Value.ToString();
            ModifiedTime = System.IO.File.GetLastWriteTime(FilePath);

            Dts.Variables["File_Modified"].Value = ModifiedTime; 
            // fi.LastWriteTime;
            int result = DateTime.Compare(ModifiedTime, LoadDate);

            if (result > 0)
            {
                  MessageBox.Show("File Modified after last load in staging");
                Dts.Variables["isModified"].Value = true;
            }
            else
            {
               MessageBox.Show("file is not modified since last load");
                Dts.Variables["isModified"].Value = false;
            }

            Dts.TaskResult = (int)ScriptResults.Success;
        }
    }
}

Answer 1

从您的堆栈跟踪中提取的错误消息是：

当应用程序未在 UserInteractive 模式下运行时显示模式对话框或表单不是有效操作。指定 ServiceNotification 或 DefaultDesktopOnly 样式以显示来自服务应用程序的通知。

您必须记住，尽管在调试 SSIS 包时，您有一个不错的 UI（BIDS 或 SQL Server Tools 外壳，具体取决于您的环境），但实际上它并不是为具有 UI 而设计的。当这个包被部署到服务器并被 SQL 作业调用时，你期望会发生什么？即消息框将显示在哪里？谁会单击“确定”以允许线程恢复？

如果您想发布反馈，您可能只想fire an information event，例如：

bool fireAgain = false;
Dts.Events.FireInformation(0, "Script Task", "File Modified after last load in staging", String.Empty, 0, ref fireAgain);

Answer 2

引发错误是因为您的脚本任务尝试显示消息框并在应用程序未在 UserInteractive 模式下运行时显示模式对话框或表单不是有效操作。因此，如果您想输出一条消息，您可以改用Dts.Log，有关详细信息，请参阅MSDN 文档。