Background In our application, we have a screen which hosts several tabs. In each tab, it contains a third-party  GridControl (like the WPF standard GridView control). And we need to display some column cells as hyper link, so user can click on it, v…

silverlight 或WPF在MVVM模式中使用INotifyDataErrorInfo接口对输入进行验证时 控件lostFocus时会触发验证,但在提交动作(例如button的Command)时,不触发 验证.下面的方法提供控件输入验证统一触发. 1.添加ValidationScope类 public class ValidationScope { public FrameworkElement ScopeElement { get; private set; } private read…

<Window x:Class="WpfTest.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008…

//定义接口 public interface IView { bool IsChanged { get; set; } void SetBinding(); void Clear(); } //定义命令 public class ClearCommand : ICommand { public event EventHandler CanExecuteChanged; public bool CanExecute(object parameter) { throw new NotImpleme…

使用CustomControl时绑定Command用法 C# Part public static RoutedUICommand ClearCommand { get; private set; } static CustomControl() { DefaultStyleKeyProperty.OverrideMetadata(typeof(CustomControl), new FrameworkPropertyMetadata(typeof(CustomControl))); Custo…

昨天在项目中遇到一个问题,按钮bind了Command后,利用CanExecute控制它的是否可点击.结果却在初始化viewmodel的时候执行了一次CanExecute,之后一直不触发,按钮的可用性状态也一直不改变.  public DelegateCommand NewCommand { get; set; } public DelegateCommand CheckCommand { get; set; } 看了半天,也没看出啥原因,以为是控件的问题,后来又换成普通的Button,结果还是…

Command="{Binding GoPayCommand}" CommandParameter="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}}"…

本文介绍一种圆形的识别方案. 识别流程 判断是否为封闭图形: 根据圆的方程,取输入点集中的1/6.3/6.5/6处的三个点,求得圆的方程,获取圆心及半径: 取点集中的部分点,计算点到圆心的距离与半径的比例,与设定的阈值比较,得出结果.~~~~ 实现 public static bool IsCircle(List<Point> points, out Point center, out double radius) { int len = points.Count; center = new…

本文介绍一种直线的识别方案. 步骤 使用最小二乘法回归直线: 得到直线方程y=kx+b后,计算所有点到直线的距离,若在阈值范围内,认为是直线. 实现 /// <summary> /// 最小二乘法求回归直线方程 /// </summary> /// <param name="points">输入数据</param> /// <param name="k">直线斜率</param> /// <…

可以调用以下语句通知 CommandManager.InvalidateRequerySuggested();…