[英]Exception has been thrown by the target of an invocation (SSIS & WinSCP & C#)
I'm getting this error message while trying to execute my SCRIPT TASK in SSIS (I'm using VS 2019 and C#).我在尝试在 SSIS 中执行我的 SCRIPT TASK 时收到此错误消息(我使用的是 VS 2019 和 C#)。
Been trying for a while it seems it wont work.试了一段时间好像不行
Error message: Exception has been thrown by the target of an invocation错误消息:调用的目标已引发异常
Details:细节:
in System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
in System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
in System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
in System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)
in Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTATaskScriptingEngine.ExecuteScript()
This is my code:这是我的代码:
#region Namespaces
using System;
using System.Data;
using Microsoft.SqlServer.Dts.Runtime;
using System.Windows.Forms;
using System.Linq;
using WinSCP;
#endregion
namespace ST_2cfb1a0997cf7b332da4453v3g1132g
{
[Microsoft.SqlServer.Dts.Tasks.ScriptTask.SSISScriptTaskEntryPointAttribute]
public partial class ScriptMain : Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTARTScriptObjectModelBase
{
public void Main()
{
SessionOptions sessionOptions = new SessionOptions
{
Protocol = Protocol.Sftp,
HostName = "xxxxxxxxxxxxxxxxxxxxxxxxx",
UserName = "xxxxxxxxxxxxxxxxxxxxxxxxx",
Password = "xxxxxxxxxxxxxxxxxxxxxxxxx",
};
using (Session session = new Session())
{
session.Open(sessionOptions);
const string externalPath = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
const string PathLocal = @"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
RemoteDirectoryInfo directoryInfo = session.ListDirectory(externalPath);
RemoteFileInfo latest =
directoryInfo.Files
.Where(file => !file.IsDirectory)
.OrderByDescending(file => file.LastWriteTime)
.FirstOrDefault();
if (latest == null)
{
throw new Exception("Error, not found");
}
session.GetFiles(
externalPath.EscapeFileMask(latest.FullName), PathLocal).Check();
}
}
#region ScriptResults declaration
/// <summary>
/// This enum provides a convenient shorthand within the scope of this class for setting the
/// result of the script.
///
/// This code was generated automatically.
/// </summary>
enum ScriptResults
{
Success = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Success,
Failure = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Failure
};
#endregion
}
}
What is going on in here?这是怎么回事?
Am i doing anything wrong?我做错什么了吗?
That sounds like TargetInvocationException
.这听起来像TargetInvocationException
。 The bad news is: we can't tell you what the underlying error was.坏消息是:我们无法告诉您潜在的错误是什么。 The good news is the runtime can .好消息是运行时可以。 With all exceptions, it is a good idea to catch them and look at the inner exception(s).对于所有异常,最好捕获它们并查看内部异常。 Consider:考虑:
try {
// Your failing code
} catch (Exception ex) {
while (ex is not null) {
LogSomewhere($"{ex.Message} ({ex.GetType().Name})");
ex = ex.InnerException;
}
// Todo: decide whether you want to rethrow ("throw") the
// exception, vs consider it handled
}
You should find that this outputs additional useful information.您应该会发现这会输出额外的有用信息。
Note: where to catch exceptions is a bit harder to define - you shouldn't swallow an exception unless:注意:在哪里捕获异常有点难以定义——你不应该吞下一个异常,除非:
catch
is top-level code - a UI event-handler, or a thread-start, etc;带有catch
的方法是顶级代码 - UI 事件处理程序或线程启动等; if you don't do something , the application will terminate如果你不做某事,应用程序将终止It is reasonable, however, to catch an exception to log/inspect it, if you rethrow, or throw a new more contextual/specific exception (in which case you should probably include the original exception as the inner-exception of your new exception).但是,捕获异常以记录/检查它是合理的,如果您重新抛出或抛出一个新的更具上下文/特定的异常(在这种情况下,您可能应该将原始异常包含为新异常的内部异常) .
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