c# - 尝试调用 Singleton 方法时出现 System.StackOverflowException
问题描述
我正在使用 c# wpf 开发一个小型密码生成器。我有一个 Log 类,它具有将消息记录到文件中的方法。它工作正常,直到我在收音机检查时添加日志。我的日志类:
public sealed class Log : MainWindow
{
private static Log instance = null;
private static readonly object padlock = new object();
public string Date;
public bool isStarted;
Log()
{
isStarted = false;
}
public static Log Instance
{
get
{
lock (padlock)
{
if (instance == null)
{
instance = new Log();
}
return instance;
}
}
}
public void ActivityLog(string message, bool start)
{
if(isStarted)
{
Date = DateTime.Now.ToString("dd'/'MM'/'yyyy HH:mm:ss");
StreamWriter sw = new StreamWriter("activity.log", true, Encoding.ASCII);
if (start)
sw.WriteAsync($"\n[{Date}] {message}\n");
else
sw.WriteAsync($"[{Date}] {message}\n");
sw.Close();
}
}
public void PasswordLog(string message)
{
Date = DateTime.Now.ToString("dd'/'MM'/'yyyy HH:mm:ss");
StreamWriter sw = new StreamWriter("passwords.log", true, Encoding.ASCII);
sw.WriteAsync($"[{Date}] {message}\n");
sw.Close();
}
}
这是导致异常的代码(如果我评论此代码它工作正常)
private void radioChecked(object sender, RoutedEventArgs e)
{
RadioButton radio = (RadioButton)sender;
switch (radio.Name)
{
case "startUpper":
Log.Instance.ActivityLog("Start with set to uppercase character", false);
break;
case "startLower":
Log.Instance.ActivityLog("Start with set to lowercase character", false);
break;
case "startNumber":
Log.Instance.ActivityLog("Start with set to number", false);
break;
case "startSpecial":
Log.Instance.ActivityLog("Start with set to special character", false);
break;
case "startDefault":
Log.Instance.ActivityLog("Start with set to default", false);
break;
}
}
还有这些单选按钮的 xaml
<Grid Margin="0,75,0,0" HorizontalAlignment="Right" VerticalAlignment="Center" Height="190" Width="180">
<Label x:Name="startWithLabel" Content="Start with:" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10,0,0,0" FontWeight="Normal" FontSize="25" FontFamily="{StaticResource COPRGT}" Width="170" RenderTransformOrigin="0.5,0.5"/>
<RadioButton Checked="radioChecked" x:Name="startUpper" Content="Uppercase letter" HorizontalAlignment="Left" Margin="20,50,0,0" VerticalAlignment="Top" FontFamily="{StaticResource COPRGT}"/>
<RadioButton Checked="radioChecked" x:Name="startLower" Content="Lowercase letter" HorizontalAlignment="Left" Margin="20,80,0,0" VerticalAlignment="Top" FontFamily="{StaticResource COPRGT}"/>
<RadioButton Checked="radioChecked" x:Name="startNumber" Content="Number" HorizontalAlignment="Left" Margin="20,110,0,0" VerticalAlignment="Top" FontFamily="{StaticResource COPRGT}"/>
<RadioButton Checked="radioChecked" x:Name="startSpecial" Content="Special character" HorizontalAlignment="Left" Margin="20,140,0,0" VerticalAlignment="Top" FontFamily="{StaticResource COPRGT}"/>
<RadioButton Checked="radioChecked" x:Name="startDefault" Content="Default" IsChecked="True" HorizontalAlignment="Left" Margin="20,170,0,0" VerticalAlignment="Top" FontFamily="{StaticResource COPRGT}"/>
</Grid>
当我试图编译时,它会在窗口初始化时抛出异常InitializeComponent();
解决方案
堆栈溢出通常是由无限递归引起的。(方法A调用方法B,方法B调用方法A等)
这只是一个没有看到堆栈跟踪的疯狂猜测,但我的猜测是:
public sealed class Log : MainWindow
为什么它继承自MainWindow
?这意味着在创建MainWindow
新代码时所有代码都在运行Log
。如果它radioChecked
在 中MainWindow
,那么这很可能是导致递归的原因。
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