实时循环计数器输出wpf
如果我想要一个文本框实时表示 wpf 中循环计数器的值,我该怎么办?
附加工作解决方案:
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
}
private delegate void UpdateTextBox(DependencyProperty dp, Object value);
...
private void MyMethod()
{
...
int iMax=...;
...
MyClass iMyClass = new MyClass(arguments);
this.DataContext = iMyClass;
UpdateTextBox updateTBox = new UpdateTextBox(textBlock1.SetValue);
for (int i = 1; i <= iMax; i++)
{
iMyClass.MyClassMethod(i);
Dispatcher.Invoke(updateTBox, System.Windows.Threading.DispatcherPriority.Background, new object[] { MyClass.MyPropertyProperty, iMyClass.myProperty });
}
这是我根据您的建议尝试的代码,但它不起作用,我在文本框中写入“0”,所以我认为绑定正常,但循环不起作用。我还制作了循环,通过循环内的 textbox2.text="a" 直接写入另一个文本框,但它也不起作用。
/// <summary>
/// Interaction logic for Window1.xaml
/// DOESNT WORK PROPERLY
/// </summary>
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
TestClass tTest = new TestClass();
this.DataContext = tTest ;
tTest.StartLoop();
}
}
public class TestClass : DependencyObject
{
public TestClass()
{
bwLoop = new BackgroundWorker();
bwLoop.DoWork += (sender, args) =>
{
// do your loop here -- this happens in a separate thread
for (int i = 0; i < 10000; i++)
{
LoopCounter=i;
}
};
}
BackgroundWorker bwLoop;
public int LoopCounter
{
get { return (int)GetValue(LoopCounterProperty); }
set { SetValue(LoopCounterProperty, value); }
}
public static readonly DependencyProperty LoopCounterProperty = DependencyProperty.Register("LoopCounter", typeof(int), typeof(TestClass));
public void StartLoop()
{
bwLoop.RunWorkerAsync();
}
}
}
What can I do if I want to have a text-box representing in real time the value of a loop counter in wpf?
appending working solution:
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
}
private delegate void UpdateTextBox(DependencyProperty dp, Object value);
...
private void MyMethod()
{
...
int iMax=...;
...
MyClass iMyClass = new MyClass(arguments);
this.DataContext = iMyClass;
UpdateTextBox updateTBox = new UpdateTextBox(textBlock1.SetValue);
for (int i = 1; i <= iMax; i++)
{
iMyClass.MyClassMethod(i);
Dispatcher.Invoke(updateTBox, System.Windows.Threading.DispatcherPriority.Background, new object[] { MyClass.MyPropertyProperty, iMyClass.myProperty });
}
Here is the code I tried according to your suggestion, but it doesnt work, I get "0" written in the textbox, so I suppose the binding is OK, but the loop doesnt work. I also made the loop to write into another textbox directly by textbox2.text="a" inside the loop, but it didnt work either.
/// <summary>
/// Interaction logic for Window1.xaml
/// DOESNT WORK PROPERLY
/// </summary>
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
TestClass tTest = new TestClass();
this.DataContext = tTest ;
tTest.StartLoop();
}
}
public class TestClass : DependencyObject
{
public TestClass()
{
bwLoop = new BackgroundWorker();
bwLoop.DoWork += (sender, args) =>
{
// do your loop here -- this happens in a separate thread
for (int i = 0; i < 10000; i++)
{
LoopCounter=i;
}
};
}
BackgroundWorker bwLoop;
public int LoopCounter
{
get { return (int)GetValue(LoopCounterProperty); }
set { SetValue(LoopCounterProperty, value); }
}
public static readonly DependencyProperty LoopCounterProperty = DependencyProperty.Register("LoopCounter", typeof(int), typeof(TestClass));
public void StartLoop()
{
bwLoop.RunWorkerAsync();
}
}
}
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在后台进程中运行循环(以便 UI 可以在循环运行时自行更新)和
这有帮助吗?请随意要求澄清...
代码示例(未经测试),使用 DependencyProperty (必须绑定到 TextBox):
Run the loop in a background process (so that the UI can update itself while the loop is running) and
write the loop counter into a property (DependencyProperty or CLR property with INotifyPropertyChanged) which is bound to a TextBox in your user interface. Alternatively, you can directly change the value of the TextBox via Dispatcher.Invoke (this is less elegant, though).
Does this help? Feel free to ask for clarification...
Code example (untested), using a DependencyProperty (which must be bound to a TextBox):
您可以使用数据绑定来不断更新文本。
you can use Data Binding for continuously updating the text.