【发布时间】：2014-06-02 19:18:47
【问题描述】：
我收到错误消息“异常已被调用的目标抛出。我有 new 关键字。我确保 ReportsData_Employee.COATSEndAssignmentDataTable 存在。
Imports System.Windows.Forms
Imports Advance.Extensions.Reporting
Imports CrystalDecisions.Shared
Imports Advance.Common.Reporting
Imports System.IO
Public Class Activity_EndAssignmentTool
ReadOnly _dt As New DataTable
Dim _dts As New DataTable
Dim _bldts As New DataTable
Dim _xml_file_name_creation As String
'// This is the line that is causing the error ============
ReadOnly _xml_datatable As ReportsData_Employee.COATSEndAssignmentDataTable = New ReportsData_Employee.COATSEndAssignmentDataTable()
'//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
======================================================================================
System.Reflection.TargetInvocationException was caught
HResult=-2146232828
Message=Exception has been thrown by the target of an invocation.
Source=mscorlib
StackTrace:
at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)
at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)
at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)
at System.Activator.CreateInstance(Type type, Boolean nonPublic)
at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, StackCrawlMark& stackMark)
at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Reflection.Assembly.CreateInstance(String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Reflection.Assembly.CreateInstance(String typeName)
at Advance.Extensions.Activities.Activity_Form.GetActivityForm(String className) in C:\Users\JJanssen\Documents\Visual Studio 2010\Projects\Legacy\Advance Extensions\advance.extensions.activities\Forms\Activity_Form.vb:line 126
at Advance.Extensions.Activities.Activity_Form.SetActivityClass() in C:\Users\JJanssen\Documents\Visual Studio 2010\Projects\Legacy\Advance Extensions\advance.extensions.activities\Forms\Activity_Form.vb:line 60
InnerException: System.NullReferenceException
HResult=-2147467261
Message=Object reference not set to an instance of an object.
Source=Advance.Extensions.Activities
StackTrace:
at Advance.Extensions.Activities.Activity_EndAssignmentTool.InitializeComponent() in C:\Users\JJanssen\Documents\Visual Studio 2010\Projects\Legacy\Advance Extensions\advance.extensions.activities\Activity_Forms\Activity_EndAssignmentTool.Designer.vb:line 479
at Advance.Extensions.Activities.Activity_EndAssignmentTool..ctor() in C:\Users\JJanssen\Documents\Visual Studio 2010\Projects\Legacy\Advance Extensions\advance.extensions.activities\Activity_Forms\Activity_EndAssignmentTool.vb:line 12
InnerException:
有人能说出我收到此错误的其他原因吗？我查看了多个链接，但很多答案不适用于我的情况。
"Exception has been thrown by the target of an invocation" error (mscorlib)
仅供参考，我已尝试ReadOnly _xml_datatable as New ReportsData_Employee.COATSEndASsignmentDataTable()，但仍然存在问题。
感谢任何帮助。如果您需要任何其他信息，请告诉我。
谢谢。
【问题讨论】：
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我在启动 Microsoft SQL Server Management Studio 时遇到了这个问题。
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@marcelomiorelli 我没有 ssms 的问题，但我发现这个论坛可能对你有所帮助。 connect.microsoft.com/SQLServer/feedback/details/668421/…
标签： vb.net runtime-error