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无法编辑/删除目录中的文件
原标题:Can not edit/delete file in the directory

我无法更新2005年视觉工作室的档案(noimg100.gif)。

这是代码,

String fileNotFoundPath = context.Server.MapPath("~/common/images/noimg100.gif");
context.Response.ContentType = "image/gif";
Image notFoundImage = Image.FromFile(fileNotFoundPath);
notFoundImage.Save(context.Response.OutputStream, ImageFormat.Gif);

我做错什么了吗 还是我需要 处理最后的图像?

Edit: I have found the following link, where it says about not to use Image.FromFile the way I have used: http://support.microsoft.com/kb/309482

最佳回答

从文件打开图像时,只要图像存在,文件就保持开放。由于您不处置 image 对象,它将继续存在,直到垃圾收集器完成并处置它。

在代码结尾处丢弃 image 对象, 并且可以再次写入文件 。

您可以使用 < / code> 块中的 < code> 来处置对象, 然后确定它总是会被处理, 即使代码中发生了错误 :

String fileNotFoundPath = context.Server.MapPath("~/common/images/noimg100.gif");
context.Response.ContentType = "image/gif";
using (Image notFoundImage = Image.FromFile(fileNotFoundPath)) {
  notFoundImage.Save(context.Response.OutputStream, ImageFormat.Gif);
}

此外,由于您不以任何方式改变图像, 解压缩图像然后再压缩图像是浪费的。 只要打开文件并将其写入流中 :

String fileNotFoundPath = context.Server.MapPath("~/common/images/noimg100.gif");
context.Response.ContentType = "image/gif";
using (FileStream notFoundImage = File.OpenRead(fileNotFoundPath)) {
  notFoundImage.CopyTo(context.Response.OutputStream);
}
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