【发布时间】:2009-11-24 15:43:42
【问题描述】:
如果我想让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,我在文本框中写了“0”,所以我想绑定没问题,但循环不起作用。我还通过循环内的 textbox2.text="a" 使循环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();
}
}
}
【问题讨论】: