帮助:为什么我的第一个WPF应用程序不起作用？

Question

我的第一个WPF应用程序,但它不起作用.请帮忙!

xaml:
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="308" Width="527">
    <Grid Name="canvas">
        <Canvas></Canvas>
    </Grid>
</Window>

代码背后:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            Line line = new Line();
            line.X1 = 0;
            line.Y1 = 100;
            line.X2 = 0;
            line.Y2 = 100;
            line.Stroke = Brushes.Red;
            line.StrokeThickness = 1; // Note1
            canvas.Children.Insert(0, line);
        }
    }
}

Answer 1

我看到的是你的第一个X,Y坐标和第二个是相同的.因此,绘制的线是在同一点上.

line.X1 = 0;
line.Y1 = 100;
line.X2 = 0;
line.Y2 = 100;

// Change too this and that will will draw straight over 100 pixels.
line.X1 = 0;
line.Y1 = 100;
line.X2 = 100;
line.Y2 = 100;

Answer 2

您的X1/Y1值与X2/Y2值相同.如果改变line.X2 = 0; to line.X2 = 50;,你会看到你的线.

如果您的线路不是动态的,通常最好直接在XAML中执行大多数可视化工作:

    <Grid Name="canvas">
    <Line X1="0" Y1="100" X2="50" Y2="100" StrokeThickness="1" Stroke="Red" />
</Grid>

希望这会有所帮助,安迪