C# 文件访问错误

Question

我有以下 C# 代码:

string selectedFile = "D:\..\IMGP2695.JPG";
MyImage myImage = new MyImage();
Image image = Image.FromFile(selectedFile);
string thumbnail_name = CreateThumbnail(image);
myImage.height = image.Height + "px";
myImage.width = image.Width + "px";
ftp.upload(myImage.internalName, selectedFile, directory);


 The process cannot access the file `'D:\..\IMGP2695.JPG'` because it is being used by another process.

当代码尝试运行ftp.upload时，我收到此错误。我知道错误意味着什么，但我不知道如何关闭已打开文件的句柄。

Answer 1

尝试通过使用using包装Image.FromFile来处置图像对象:

string selectedFile = "D:\..\IMGP2695.JPG";
MyImage myImage = new MyImage();
string thumbnail_name = string.empty;
using(Image image = Image.FromFile(selectedFile)){
   thumbnail_name = CreateThumbnail(image);
   myImage.height = image.Height + "px";
   myImage.width = image.Width + "px";
}
ftp.upload(myImage.internalName, selectedFile, directory);