图像控件在wpf中显示已删除的图像 [英] Image Control Showing Deleted Image in wpf

问题描述

我正在创建wpf应用程序。我在图像控件中显示预览图像（由cam拍摄）。默认情况下会保存图像。如果用户想要重新拍摄照片我将删除当前图像。

 int imageCount = Directory.GetFiles（imgDir，*， SearchOption.TopDirectoryOnly）。长度; 
 
 ImageFormat imgFormat =（ImageFormat）GetValue（SnapshotFormatProperty）; 
 
 string filePath = Path.Combine（imgDir，IMAGE_+ ++ imageCount +.Jpeg）; 
 
使用（Bitmap bmp = new Bitmap（panelWidth，panelHeight））
 {
 using（Graphics graphics = Graphics.FromImage（bmp））
 {
 // image 
} 
 bmp.Save（filePath，imgFormat）; 
} 
 globalFilePath = filePath; 

在图像控制中显示图像

< pre lang =cs> string strUri = String .Format（WebCamControl.globalFilePath）;
previewImage.Source = BitmapFromUri（ new Uri（strUri））;

  public   static  ImageSource BitmapFromUri（Uri source）
 {
  var  bitmap =  new  BitmapImage（）; 
 bitmap.BeginInit（）; 
 bitmap.UriSource = source; 
 bitmap.CacheOption = BitmapCacheOption.OnLoad; 
 bitmap.EndInit（）; 
 返回位图; 
} 

 previewImage.Source = null; 

  if （System.IO.File.Exists（WebCamControl.globalFilePath）） 
 {
 System.IO.File.Delete（WebCamControl.globalFilePath）; 
} 
  else  
 {
 MessageBox.Show（ 文件不存在）; 
} 

完成此过程后，当我拍摄新图像时，图像控件显示删除的上一张图片。图像控件是否缓存了普通图像？请给我解决方案。

解决方案

我想， BitmapCacheOption.OnLoad 它：在加载时将整个图像缓存到内存中。所有图像数据请求都从内存存储器中填充。

尝试无而不是

I am creating wpf application. I am showing the preview image(which is taken by cam) in Image control. The image get saved by default. If the user want to retake the photo i am deleting the current image.

int imageCount = Directory.GetFiles(imgDir, "*",SearchOption.TopDirectoryOnly).Length;

  ImageFormat imgFormat = (ImageFormat)GetValue(SnapshotFormatProperty);

   string filePath = Path.Combine(imgDir, "IMAGE_" + ++imageCount + ".Jpeg");

                using (Bitmap bmp = new Bitmap(panelWidth, panelHeight))
                {
                    using (Graphics graphics = Graphics.FromImage(bmp))
                    {
                        // image
                    }
                    bmp.Save(filePath, imgFormat);
                }
                globalFilePath = filePath;

showing image in Image Control

string strUri = String.Format(WebCamControl.globalFilePath);
           previewImage.Source = BitmapFromUri(new Uri(strUri));

public static ImageSource BitmapFromUri(Uri source)
        {
            var bitmap = new BitmapImage();
            bitmap.BeginInit();
            bitmap.UriSource = source;
            bitmap.CacheOption = BitmapCacheOption.OnLoad;
            bitmap.EndInit();
            return bitmap;
        }

previewImage.Source = null;

if (System.IO.File.Exists(WebCamControl.globalFilePath))
                {
                    System.IO.File.Delete(WebCamControl.globalFilePath);
                }
                else
                {
                    MessageBox.Show("File Not Exists");
                }

After Completing this process when i take the new image the Image control shows the previous image which was deleted. Is the Image Control caching the previus Image??Kindly give me the solution.

解决方案

I suppose, BitmapCacheOption.OnLoad does it: "Caches the entire image into memory at load time. All requests for image data are filled from the memory store."
Try None instead

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