vb.net-2010 - OnCreateMainForm() Sub 内部 Application.Designer.vb 内部错误

Question

我无法弄清楚这里的问题是什么。我从头开始项目，去调试，并收到错误:

System.InvalidOperationException was unhandled Message=An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object.

我不明白为什么在自动生成的文件中会发生此错误。这是完整的代码:

    '------------------------------------------------------------------------------
' <auto-generated>
'     This code was generated by a tool.
'     Runtime Version:4.0.30319.269
'
'     Changes to this file may cause incorrect behavior and will be lost if
'     the code is regenerated.
' </auto-generated>
'------------------------------------------------------------------------------

Option Strict On
Option Explicit On


Namespace My

    'NOTE: This file is auto-generated; do not modify it directly.  To make changes,
    ' or if you encounter build errors in this file, go to the Project Designer
    ' (go to Project Properties or double-click the My Project node in
    ' Solution Explorer), and make changes on the Application tab.
    '
    Partial Friend Class MyApplication

        <Global.System.Diagnostics.DebuggerStepThroughAttribute()>  _
        Public Sub New()
            MyBase.New(Global.Microsoft.VisualBasic.ApplicationServices.AuthenticationMode.Windows)
            Me.IsSingleInstance = false
            Me.EnableVisualStyles = true
            Me.SaveMySettingsOnExit = true
            Me.ShutDownStyle = Global.Microsoft.VisualBasic.ApplicationServices.ShutdownMode.AfterMainFormCloses
        End Sub

        <Global.System.Diagnostics.DebuggerStepThroughAttribute()>  _
        Protected Overrides Sub OnCreateMainForm()
            Me.MainForm = Global.AccountAndClientFull.frmMain 'HERE IS WHERE THE ERROR OCCURS
        End Sub
    End Class
End Namespace

错误发生在:

Me.MainForm = Global.AccountAndClientFull.frmMain

有什么建议么？我无法弄清楚需要在项目属性的应用程序选项卡中进行哪些更改。

Answer 1

我得到了同样的错误，并意识到这是因为我在表单代码中声明了一个私有(private)默认构造函数。如果您创建了一个构造函数并且没有将其公开，请尝试将其公开。