C# Bunifu UI System.NullReferenceException 未处理

Question

我正在使用 Bunifu UI 框架，一切都很好，直到我从 Bunifu UI 添加了一个 "Exit" 按钮，它是 bunifuFlatButton，我都尝试了 this.Close();和关闭（）；并且我得到 System.NullReferenceException was unhandled Error.

按钮：

错误：

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，如果您希望设置仅包含图像的 "Exit" 按钮，目前 Bunifu Flat Button. You can however use (as I have always done in such design use-cases) a Bunifu Thin Button or even better, a Bunifu Image Button 存在问题。

Answer 2

我认为发生这种情况是因为 bunifu 按钮有一些方法，例如 "change color on hover, color on mouse click etc"，
当您单击按钮时，表单会关闭，但随后应用程序可能会尝试调用该按钮的方法bunifu 按钮，例如在鼠标单击后改变颜色，但表单关闭，然后发生错误。
我通过在表单关闭前禁用按钮来解决这个问题：

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

C# Bunifu UI System.NullReferenceException 未处理

C# Bunifu UI System.NullReferenceException was unhandled

c#

user-interface

button

winforms

bunifu