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01

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代码如下

一、创建CheckCode.xaml代码如下。

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:controls="clr-namespace:WPFDevelopers.Controls"><ResourceDictionary.MergedDictionaries><ResourceDictionary Source="Basic/ControlBasic.xaml"/></ResourceDictionary.MergedDictionaries><Style TargetType="{x:Type controls:CheckCode}" BasedOn="{StaticResource ControlBasicStyle}"><Setter Property="Background" Value="{x:Null}"/><Setter Property="Width" Value="100"/><Setter Property="Height" Value="40"/><Setter Property="Cursor" Value="Hand"/><Setter Property="Template"><Setter.Value><ControlTemplate TargetType="{x:Type controls:CheckCode}"><Image x:Name="PART_Image" Stretch="Fill" Source="{TemplateBinding ImageSource}"/></ControlTemplate></Setter.Value></Setter></Style>
</ResourceDictionary>

二、CheckCode.cs代码如下。

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;namespace WPFDevelopers.Controls
{[TemplatePart(Name = ImageTemplateName, Type = typeof(Image))]public class CheckCode : Control{private const string ImageTemplateName = "PART_Image";private Image _image;private Size _size = new Size(70, 23);private const string strCode = "abcdefhkmnprstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ23456789"; public static readonly DependencyProperty ImageSourceProperty = DependencyProperty.Register("ImageSource", typeof(ImageSource), typeof(CheckCode),new PropertyMetadata(null));/// <summary>/// 随机生成的验证码/// </summary>public ImageSource ImageSource{get { return (ImageSource)GetValue(ImageSourceProperty); }set { SetValue(ImageSourceProperty, value); }}/// <summary>/// 字体颜色/// </summary>public Brush SizeColor{get { return (Brush)GetValue(SizeColorProperty); }set { SetValue(SizeColorProperty, value); }}public static readonly DependencyProperty SizeColorProperty =DependencyProperty.Register("SizeColor", typeof(Brush), typeof(CheckCode), new PropertyMetadata(DrawingContextHelper.Brush));public CheckCode(){this.Loaded += CheckCode_Loaded;}private void CheckCode_Loaded(object sender, RoutedEventArgs e){ImageSource = CreateCheckCodeImage(CreateCode(4), (int)this.ActualWidth, (int)this.ActualHeight);}public override void OnApplyTemplate(){base.OnApplyTemplate();_image = GetTemplateChild(ImageTemplateName) as Image;if (_image != null)_image.PreviewMouseDown += _image_PreviewMouseDown;}private void _image_PreviewMouseDown(object sender, MouseButtonEventArgs e){if (!IsLoaded)return;ImageSource = CreateCheckCodeImage(CreateCode(4), (int)this.ActualWidth, (int)this.ActualHeight);}private string CreateCode(int strLength){var _charArray = strCode.ToCharArray();var randomCode = "";int temp = -1;Random rand = new Random(Guid.NewGuid().GetHashCode());for (int i = 0; i < strLength; i++){if (temp != -1)rand = new Random(i * temp * ((int)DateTime.Now.Ticks));int t = rand.Next(strCode.Length - 1);if (!string.IsNullOrWhiteSpace(randomCode)){while (randomCode.ToLower().Contains(_charArray[t].ToString().ToLower()))t = rand.Next(strCode.Length - 1);}if (temp == t)return CreateCode(strLength);temp = t;randomCode += _charArray[t];}return randomCode;}private ImageSource CreateCheckCodeImage(string checkCode, int width, int height){if (string.IsNullOrWhiteSpace(checkCode))return null;if (width <= 0 || height <= 0)return null;var drawingVisual = new DrawingVisual();var random = new Random(Guid.NewGuid().GetHashCode());using (DrawingContext dc = drawingVisual.RenderOpen()){dc.DrawRectangle(Brushes.White, new Pen(SizeColor, 1), new Rect(_size));var formattedText = DrawingContextHelper.GetFormattedText(checkCode,color:SizeColor, flowDirection: FlowDirection.LeftToRight,textSize:20, fontWeight: FontWeights.Bold);dc.DrawText(formattedText, new Point((_size.Width - formattedText.Width) / 2, (_size.Height - formattedText.Height) / 2));for (int i = 0; i < 10; i++){int x1 = random.Next(width - 1);int y1 = random.Next(height - 1);int x2 = random.Next(width - 1);int y2 = random.Next(height - 1);dc.DrawGeometry(Brushes.Silver, new Pen(Brushes.Silver, 0.5D), new LineGeometry(new Point(x1, y1), new Point(x2, y2)));}for (int i = 0; i < 100; i++){int x = random.Next(width - 1);int y = random.Next(height - 1);SolidColorBrush c = new SolidColorBrush(Color.FromRgb((byte)random.Next(0, 255), (byte)random.Next(0, 255), (byte)random.Next(0, 255)));dc.DrawGeometry(c, new Pen(c, 1D), new LineGeometry(new Point(x - 0.5, y - 0.5), new Point(x + 0.5, y + 0.5)));}dc.Close();}var renderBitmap = new RenderTargetBitmap(70, 23, 96, 96, PixelFormats.Pbgra32);renderBitmap.Render(drawingVisual);return BitmapFrame.Create(renderBitmap);}}
}

三、新建CheckCodeExample.cs代码如下。

<UserControl x:Class="WPFDevelopers.Samples.ExampleViews.CheckCodeExample"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:local="clr-namespace:WPFDevelopers.Samples.ExampleViews"xmlns:wpfdev="https://github.com/WPFDevelopersOrg/WPFDevelopers"mc:Ignorable="d" d:DesignHeight="450" d:DesignWidth="800"><UniformGrid Rows="2" Columns="2"><wpfdev:CheckCode SizeColor="LimeGreen"/><wpfdev:CheckCode SizeColor="Red"/><wpfdev:CheckCode SizeColor="DodgerBlue"/><wpfdev:CheckCode SizeColor="HotPink"/></UniformGrid>
</UserControl>

02

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效果预览

鸣谢素材提供者 - 屈越

源码地址如下

Github：https://github.com/WPFDevelopersOrg

Gitee：https://gitee.com/WPFDevelopersOrg

WPF开发者QQ群： 340500857 | 458041663

Github：https://github.com/WPFDevelopersOrg

出处：https://www.cnblogs.com/yanjinhua

版权：本作品采用「署名-非商业性使用-相同方式共享 4.0 国际」许可协议进行许可。

转载请著名作者 出处 https://github.com/WPFDevelopersOrg

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