Question

我的图书馆正在使用独立存储，但只能按需提供。所以我正在使用Lazy<T>。

但是，这会引发：

System.IO.IsolatedStorage.IsolatedStorageException“无法确定已授予的程序集权限。”

对于混淆隔离存储初始化的线程，Lazy是否会做一些奇怪的事情？

示例代码：

using System;
using System.IO.IsolatedStorage;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            var thisWorks = IsolatedStorageFile.GetMachineStoreForAssembly();
            thisWorks.Dispose();

            var lazyStorage = new Lazy<IsolatedStorageFile>(IsolatedStorageFile.GetMachineStoreForAssembly);

            var thisFails = lazyStorage.Value;
            thisFails.Dispose();
        }
    }
}

完整堆栈跟踪：

System.IO.IsolatedStorage.IsolatedStorageException was unhandled
  Message=Unable to determine granted permission for assembly.
  Source=mscorlib
  StackTrace:
    Server stack trace: 
       at System.IO.IsolatedStorage.IsolatedStorage.InitStore(IsolatedStorageScope scope, Type domainEvidenceType, Type assemblyEvidenceType)
       at System.IO.IsolatedStorage.IsolatedStorageFile.GetMachineStoreForAssembly()
       at System.Lazy`1.CreateValue()
    Exception rethrown at [0]: 
       at System.IO.IsolatedStorage.IsolatedStorage.InitStore(IsolatedStorageScope scope, Type domainEvidenceType, Type assemblyEvidenceType)
       at System.IO.IsolatedStorage.IsolatedStorageFile.GetMachineStoreForAssembly()
       at System.Lazy`1.CreateValue()
       at System.Lazy`1.LazyInitValue()
       at System.Lazy`1.get_Value()
       at ConsoleApplication1.Program.Main(String[] args) in C:\Users\Andrew Davey\AppData\Local\Temporary Projects\ConsoleApplication1\Program.cs:line 19
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException:

Answer 1

看起来像是因为你传递了一个MethodGroup（而不是直接代理/ lambda），并且它无法确定调用最初的来源。如果你把它切换到这个：

var lazyStorage = new Lazy<IsolatedStorageFile>(() => IsolatedStorageFile.GetMachineStoreForAssembly());

它应该可以正常工作。

懒惰地创建孤立存储

1 个答案: