https://learn.microsoft.com/zh-cn/dotnet/api/system.windows.forms.statusbar.statusbarpanelcollection.containskey?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
StatusBar.StatusBarPanelCollection.ContainsKey(String) Method (System.Windows.Forms) | Microsoft...
Determines whether the collection contains a StatusBarPanel with the specified key.
windows formsstatusbarstringmethodsystem
https://learn.microsoft.com/zh-cn/dotnet/api/system.windows.forms.statusbar.statusbarpanelcollection.count?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
StatusBar.StatusBarPanelCollection.Count Property (System.Windows.Forms) | Microsoft Learn
Gets the number of items in the collection.
property systemwindows formsstatusbarcountmicrosoft
https://learn.microsoft.com/zh-cn/dotnet/api/system.windows.forms.statusbar.statusbarpanelcollection.isreadonly?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
StatusBar.StatusBarPanelCollection.IsReadOnly Property (System.Windows.Forms) | Microsoft Learn
Gets a value indicating whether this collection is read-only.
property systemwindows formsstatusbarmicrosoftlearn
https://learn.microsoft.com/zh-cn/dotnet/api/system.windows.forms.statusbar.statusbarpanelcollection.system-collections-icollection-issynchronized?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
StatusBar.StatusBarPanelCollection.ICollection.IsSynchronized Property (System.Windows.Forms) |...
Gets a value indicating whether access to the collection is synchronized (thread safe).
property systemstatusbaricollectionwindowsforms