计算隔离存储器中文件的大小

Question

除了打开文件流并调用“长度”属性外，我似乎无法找到确定隔离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

Answer 1

我发现了一点点黑客，使其工作。你所要做的就是使用反射来获取完全合格的文件路径，文件，然后你想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; 
} 

Answer 2

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