文件未释放,即使使用 .Dispose()
本文关键字:Dispose 释放 文件 | 更新日期: 2023-09-27 17:56:11
>我有一个简单的 C# 应用程序来重命名和调整图像大小,我有一个小问题 - 当它完成处理所有给定文件时,最后一个总是留在程序的内存或其他任何东西中,如果不关闭程序,我无法删除它。
如何使我的代码在完成后始终发布它使用的文件?
这是我所拥有的
private void processFiles() {
foreach (string oldFileNamePath in fileEntries) {
...
File.Move(oldFileNamePath, newFileNamePath);
if (isResizeImage) {
if (!extension.Equals(".gif")) {
Image newImage = Image.FromFile(newFileNamePath);
int newWidth = (int) (newImage.Width * (1 + ((double) percentageSize / 100)));
int newHeight = (int) (newImage.Height * (1 + ((double) percentageSize / 100)));
newImage = ResizeImage(newFileNamePath, newWidth, newHeight);
newImage.Save(directory + RESIZED_DIRECTORY + "''" + newFileName, ImageFormat.Jpeg);
newImage.Dispose();
} else {
// only move
File.Move(newFileNamePath, directory + RESIZED_DIRECTORY + "''" + newFileName);
}
}
}
}
public static Bitmap ResizeImage(String path, int width, int height) {
Image image = Image.FromFile(path);
var destRect = new Rectangle(0, 0, width, height);
var destImage = new Bitmap(width, height);
destImage.SetResolution(image.HorizontalResolution, image.VerticalResolution);
using (var graphics = Graphics.FromImage(destImage)) {
// process image
using (var wrapMode = new ImageAttributes()) {
wrapMode.SetWrapMode(WrapMode.TileFlipXY);
graphics.DrawImage(image, destRect, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, wrapMode);
}
}
image.Dispose();
return destImage;
}
}
原始新图像未公开。您正在重新分配它并处置新图像新您从 ResizeImage 接收。
删除以下内容:
Image newImage = Image.FromFile(newFileNamePath);
并将声明移动到下一行。这条线没有做任何事情,因为你在之后立即替换它并处理新的替换,但永远不会处理原来的。
编辑 OP 后:
您应该这样做:
Image newImage = Image.FromFile(newFileNamePath);
int newWidth = (int) (newImage.Width * (1 + ((double) percentageSize / 100)));
int newHeight = (int) (newImage.Height * (1 + ((double) percentageSize / 100)));
newImage.Dispose();
Image anotherImage = ResizeImage(newFileNamePath, newWidth, newHeight))
anotherImage.Save(directory + RESIZED_DIRECTORY + "''" + newFileName, ImageFormat.Jpeg);
anotherImage.Dispose();
出于解释目的,我确实省略了使用。但通常你应该这样做:
using (Image newImage = Image.FromFile(newFileNamePath))
{
int newWidth = (int) (newImage.Width * (1 + ((double) percentageSize / 100)));
int newHeight = (int) (newImage.Height * (1 + ((double) percentageSize / 100)));
using (Image anotherImage = ResizeImage(newFileNamePath, newWidth, newHeight))
anotherImage.Save(directory + RESIZED_DIRECTORY + "''" + newFileName, ImageFormat.Jpeg);
}
}