WPF：图像处理（一）图像文件获取与预览

[csharp]

文件名称：Folder.cs
 
开发环境：
    Visual Studio V2010
    .NET Framework 4 Client Profile
 
版本历史：
    V1.0    2012年04月16日
            图像文件获取与预览
------------------------------------------------------------ */ 
using System; 
using System.Collections.Generic; 
using System.IO; 
using System.Text.RegularExpressions; 
using System.Windows.Controls; 
using System.Windows.Media; 
using System.Windows.Media.Imaging; 
 
namespace Splash.Imaging 
{ 
    public static class Folder 
    {    
        /// <summary> 
        /// 委托声明：鼠标点击事件处理器 
        /// </summary> 
        /// <param name="sender">附加事件处理程序的对象</param> 
        /// <param name="e">事件数据</param> 
        public delegate void MyMouseDownEventHandler(object sender, System.Windows.Input.MouseButtonEventArgs e); 
 
        /// <summary> 
        /// 返回指定目录中与指定的搜索模式匹配的文件的名称（包含它们的路径），并使用一个值以确定是否搜索子目录 
        /// </summary> 
        /// <param name="folderPath">将从其检索文件的目录</param> 
        /// <param name="filter">搜索模式匹配</param> 
        /// <param name="searchOption">指定搜索操作应包括所有子目录还是仅包括当前目录</param> 
        /// <returns>包含指定目录中与指定搜索模式匹配的文件的名称列表</returns> 
        public static String[] GetFiles(String folderPath, String filter, SearchOption searchOption) 
        {   // 获取文件列表 
            String[] FileEntries = Directory.GetFiles(folderPath, "*", searchOption); 
            if (FileEntries.Length == 0)  
                return null; 
            else if (String.IsNullOrEmpty(filter))  
                return FileEntries; 
 
            // 建立正则表达式 
            Regex rx = new Regex(filter, RegexOptions.IgnoreCase); 
 
            // 过滤文件 
            List<String> FilterFileEntries = new List<String>(FileEntries.Length);             
            foreach (String FileName in FileEntries) 
            { 
                if (rx.IsMatch(FileName)) 
                { 
                    FilterFileEntries.Add(FileName); 
                } 
            } 
 
            return (FilterFileEntries.Count == 0) ? null : FilterFileEntries.ToArray();             
        } 
 
        /// <summary> 
        /// 返回指定目录中图像文件列表，并使用一个值以确定是否搜索子目录 
        /// </summary> 
        /// <param name="folderPath">将从其检索文件的目录</param> 
        /// <param name="searchOption">指定搜索操作应包括所有子目录还是仅包括当前目录</param> 
        /// <returns>图像文件列表</returns> 
        public static String[] GetImages(String folderPath, SearchOption searchOption) 
        { 
            String filter = "//.(bmp|gif|jpg|jpe|png|tiff|tif)$"; 
            return GetFiles(folderPath, filter, searchOption); 
        } 
 
        /// <summary> 
        /// 显示图像 
        /// </summary> 
        /// <param name="panel">放置图像控件的容器</param> 
        /// <param name="images">要显示的图像文件集合</param> 
        /// <param name="handler">图像控件点击事件处理器</param> 
        public static void DisplayImages(StackPanel panel, String[] images, MyMouseDownEventHandler handler) 
        {   // 参数检测 www.2cto.com  
            if ((panel == null) || (images == null)) return; 
 
            // 清空所有图像控件 
            panel.Children.Clear(); 
 
            // 增加新的图像控件 
            Double Stride = (panel.Orientation == Orientation.Horizontal) ? panel.Height : panel.Width; 
            foreach (String FileName in images) 
            {   // 设置边框                            
                Border border = new Border(); 
                border.Margin = new System.Windows.Thickness(4);            // 边框外边距 
                border.BorderThickness = new System.Windows.Thickness(4);   // 边框厚度 
                border.BorderBrush = new SolidColorBrush(Colors.DarkGreen); // 边框颜色 
 
                // 边框大小 
                if (panel.Orientation == Orientation.Horizontal) 
                {    
                    border.Height = border.Width = Stride - border.Margin.Top - border.Margin.Bottom;  
                } 
                else 
                { 
                    border.Height = border.Width = Stride - border.Margin.Left - border.Margin.Right; 
                } 
                 
                // 设置图像控件 
                Image image = new Image(); 
                image.Width = border.Width - border.BorderThickness.Left - border.BorderThickness.Right;   // 图像控件宽度 
                image.Height = border.Height - border.BorderThickness.Top - border.BorderThickness.Bottom;  // 图像控件高度 
                image.Stretch = System.Windows.Media.Stretch.Uniform; 
                image.Source = new BitmapImage(new Uri(FileName)); 
 
                // 图片点击事件 
                image.MouseDown += new System.Windows.Input.MouseButtonEventHandler(handler); 
 
                // 设置控件布局 
                border.Child = image; 
                panel.Children.Add(border); 
            } 
        } 
    } 
} 

作者：秦建辉