我在使用WinRT在Windows Phone 8.1上暂停事件时遇到问题,它不会触发.我不知道为什么.这是我的代码:
/// <summary>
/// Initializes the singleton application object. This is the first line of authored code
/// executed, and as such is the logical equivalent of main() or WinMain().
/// </summary>
public App()
{
InitializeComponent();
Suspending += OnSuspending;
#if DEBUG
this.displayRequest = new DisplayRequest();
#endif
}
/// <summary>
/// Invoked when application execution is being suspended. Application state is saved
/// without knowing whether the application will be terminated or resumed with the contents
/// of memory …我正在尝试SqlTransaction在异步中提交/回滚.但看起来不支持异步.有没有办法让它成为异步而不使用原始SQL来启动事务？
我创建了一个继承自TCustomControl并发布其属性Align的自定义控件TControl.但是,当我在C++ Builder项目中使用此自定义控件时,它引发了异常
Project Launcher.exe raised exception class EReadError with message 'Property Align does not exist'.
这是自定义控件的代码.
unit GameListCtrl;
interface
uses
SysUtils, Classes, Controls;
type
TGameList = class(TCustomControl)
private
protected
procedure Paint; override;
public
{ Public declarations }
published
property Align default alLeft;
end;
implementation
{ TGameList }
procedure TGameList.Paint;
begin
inherited;
end;
end.
我不知道为什么这段代码总是切片超出范围：
parts := make([]string, 0, len(encodedCode)/4)
for i := 0; i < len(encodedCode); i += 4 {
parts = append(parts, encodedCode[i:4])
}
encodedCode是长度始终为4的字符串。这意味着encodedCode[i:4]永远不会超出范围。