C# Bunifu UI System.NullReferenceException未处理

Question

我使用的是bunifuFlatButton，一切都很好，直到我从Bunifu (也就是bunifuFlatButton)中添加了一个"Exit“按钮，我尝试了this.Close()和Close()；对于这两个选项，我得到的System.NullReferenceException都是未处理的错误。

按钮：

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错误：

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System.NullReferenceException was unhandled
  HResult=-2147467261
  Message=Object reference not set to an instance of an object.
  Source=Bunifu_UI_v1.5.3
  StackTrace:
       at Bunifu.Framework.UI.BunifuFlatButton.method_5()
       at Bunifu.Framework.UI.BunifuFlatButton.BunifuFlatButton_MouseClick(Object sender, MouseEventArgs e)
       at System.Windows.Forms.Control.OnMouseClick(MouseEventArgs e)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.Label.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(Form mainForm)
       at Project.Program.Main() in C:\Project\Project\Program.cs:line 19
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException:

谢谢

Answer 1

是的，目前布努福扁按钮有一个问题。但是，您可以使用(就像我在这种设计用例中一直做的那样)一个布努夫瘦按钮，或者更好的布纳福图像按钮，如果您希望设置一个只包含图像的"Exit“按钮。

Answer 2

我认为这是因为bunifu按钮有“在悬停时改变颜色，鼠标单击时改变颜色”等方法，

当您单击按钮时，表单会关闭，但可能应用程序尝试在该按钮上调用一个方法，例如鼠标单击后更改颜色，但表单被关闭，然后出现错误。

I通过禁用表单关闭前的按钮来修复此问题：

private void bunifuFlatButton1_Click(object sender, EventArgs e)
{
    bunifuFlatButton1.Enabled = false;
    this.Close();
}