无法删除MemoryMappedFile的文件

问题描述

以下代码引发此异常：

进程无法访问文件'\ filename'，因为它正被另一个进程使用。

足够合理，但关闭读取器和/或mmf的正确方法是什么，以便文件可以被删除？我会认为，MemoryMappedFile将有一个close（）方法或类似的东西，但它不。

任何帮助将不胜感激。
$ b

  b 
 $ b 
  using（var mmf = MemoryMappedFile.CreateFromFile（filename，
 System.IO.FileMode.OpenOrCreate，
myMap+ fileNo.ToString（），fileSize））
 {
 using（reader = mmf.CreateViewAccessor（0，accessorSize））
 {
 ...< do stuff> ... 
} 
} 
 
 File.Delete（filename）; 
  
否则，请调用 Dispose（） code> reader 和 mmf 对象，但是使用会确保它在< do stuff> 中抛出异常的情况下进行清理。
 
The following code throws this exception:
"The process cannot access the file '\filename' because it is being used by another process."
Fair enough, but what's the proper way to close the reader and/or mmf so that the file can be deleted? I would think that MemoryMappedFile would have a close() method or something similar, but it doesn't.
Any help would be greatly appreciated. Thanks.
mmf = MemoryMappedFile.CreateFromFile(filename,
      System.IO.FileMode.OpenOrCreate,
      "myMap" + fileNo.ToString(),
      fileSize);

reader = mmf.CreateViewAccessor(0, accessorSize);

<do stuff>

File.Delete(filename);
EDITS:
It looks like it's only in the destructor that I'm having this problem. When dispose() is called elsewhere it works fine, but when I do the following it throws the exception. Reader and mmf are obviously members of the class. Is something implicit happening to the file access once the constructor is entered?
~Class()
{
    try
    {
        if (File.Exists(filename))
        {
            reader.Dispose();
            mmf.Dispose();
            File.Delete(filename);
        }
    }
    catch (Exception e)
    {
    }
}
 解决方案 
You should utilize the using construct if possible:
using (var mmf = MemoryMappedFile.CreateFromFile(filename,
                   System.IO.FileMode.OpenOrCreate,
                   "myMap" + fileNo.ToString(), fileSize))
{
    using (reader = mmf.CreateViewAccessor(0, accessorSize))
    {
       ... <do stuff> ...
    }
}

File.Delete(filename);
Otherwise call Dispose() on the reader and mmf objects, however using will make sure that it is cleaned up in case exceptions are being thrown in <do stuff>.
                        
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