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计算独立存储中文件的大小

发布于 2024-09-24 20:03:30 字数 78 浏览 3 评论 0原文

除了打开文件流并调用“Length”属性之外，我似乎找不到确定独立存储中文件大小的方法。有没有更有效的方法来做到这一点？

谢谢

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花心好男孩 2024-10-01 20:03:30

我发现了一些技巧可以让它发挥作用。您要做的就是使用反射来获取所需文件的完全限定文件路径，然后创建一个新的文件信息对象：

//This is the private field name used for reflection
private const string IsolatedStoreRootDir = "m_RootDir";

//This method takes a file path relative to isolated storage
//and the current store
private static FileInfo GetFileInfo(string path, IsolatedStorageFile store)
{
    return new FileInfo(GetFullyQualifiedFileName(path, store));
}

//This gets the fully qualified path of the root isolated storage directory
//then appends the relative path to it.
private static string GetFullyQualifiedFileName(string path, IsolatedStorageFile store)
{
    return Path.Combine(store.GetType()
      .GetField(IsolatedStorageFileSystem.IsolatedStoreRootDir, 
      System.Reflection.BindingFlags.NonPublic |
      System.Reflection.BindingFlags.Instance).GetValue(store).ToString(), path);
}

//Here's how it's used
static void Main(string[] args)
{
    var store = IsolatedStorageFile.GetUserStoreForAssembly();

    var length = GetFileInfo("TestFile.txt", store).Length;
}

I found a bit of a hack to make it work. What you have to do is use reflection to get the fully qualified file path to the file you want then create a new file info object:

//This is the private field name used for reflection
private const string IsolatedStoreRootDir = "m_RootDir";

//This method takes a file path relative to isolated storage
//and the current store
private static FileInfo GetFileInfo(string path, IsolatedStorageFile store)
{
    return new FileInfo(GetFullyQualifiedFileName(path, store));
}

//This gets the fully qualified path of the root isolated storage directory
//then appends the relative path to it.
private static string GetFullyQualifiedFileName(string path, IsolatedStorageFile store)
{
    return Path.Combine(store.GetType()
      .GetField(IsolatedStorageFileSystem.IsolatedStoreRootDir, 
      System.Reflection.BindingFlags.NonPublic |
      System.Reflection.BindingFlags.Instance).GetValue(store).ToString(), path);
}

//Here's how it's used
static void Main(string[] args)
{
    var store = IsolatedStorageFile.GetUserStoreForAssembly();

    var length = GetFileInfo("TestFile.txt", store).Length;
}

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听你说爱我 2024-10-01 20:03:30

long Size = 0L;
using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream(filePath, FileMode.Open, FileAccess.Read, isoFile))
{
  Size = stream.Length;
}

long Size = 0L;
using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream(filePath, FileMode.Open, FileAccess.Read, isoFile))
{
  Size = stream.Length;
}

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~没有更多了~