我正在编写一个单元测试来验证对象的序列化，并且我能够成功保存文件而没有任何问题。我什至可以浏览文件并验证内容是否正确。但是，当我尝试打开文件进行阅读时，我总是收到 UnauthorizedAccess 异常。
这是用于保存项目的代码：
public static async Task SaveItem<T>(string folderName, T item)
where T : BaseBusinessItem
{
if (string.IsNullOrEmpty(folderName))
{
throw new ArgumentNullException("folderName");
}
if (item == null)
{
throw new ArgumentNullException("item");
}
try
{
var folder = await ApplicationData.Current.LocalFolder
.CreateFolderAsync(folderName, CreationCollisionOption.OpenIfExists);
var file =
await
folder.CreateFileAsync(item.UniqueID.GetHashCode().ToString(), CreationCollisionOption.ReplaceExisting);
var stream = await file.OpenAsync(FileAccessMode.ReadWrite);
using (var outStream = stream.GetOutputStreamAt(0))
{
var serializer = new DataContractJsonSerializer(typeof(T));
serializer.WriteObject(outStream.AsStreamForWrite(), item);
await outStream.FlushAsync();
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.ToString());
}
}
这是用于恢复项目的代码：
public static async Task<T> RestoreItem<T>(string folderName, string hashCode)
where T : BaseBusinessItem, new()
{
if (string.IsNullOrEmpty(folderName))
{
throw new ArgumentNullException("folderName");
}
if (string.IsNullOrEmpty(hashCode))
{
throw new ArgumentNullException("hashCode");
}
var folder = await ApplicationData.Current.LocalFolder.GetFolderAsync(folderName);
var file = await folder.GetFileAsync(hashCode);
var inStream = await file.OpenSequentialReadAsync();
var serializer = new DataContractJsonSerializer(typeof(T));
var retVal = (T)serializer.ReadObject(inStream.AsStreamForRead());
return retVal;
}
和单元测试：
[TestMethod]
public async Task TestFileSaveLoad()
{
await _ds.SaveItem("TestFolder");
Guid ID = _item.UniqueID;
_ds = await ItemDataSource.LoadItem("TestFolder", ID.GetHashCode().ToString());
}
我可能遗漏的任何想法或故障排除步骤。单元测试应用清单包括以下功能：文档库、Internet（客户端）。以下声明已到位：文件打开选择器、文件保存选择器和文件类型关联。
谢谢！