DataContractSerializer - 意外的EOF

问题描述

我有想要序列化的对象。我决定使用DataContractSerializer，但是我得到一个运行时错误，说当序列化程序尝试ReadObjects时我的程序遇到了未经检测的文件。下面是代码：

I have objects that I want to serialize. I decided to use DataContractSerializer, but I get a runtime error saying that my program encounters unexpexted of file when the serializer try to ReadObjects. Here is the code:

public static async Task SaveFeedsToFile(List<FeedItem> wantToBeSaved)
{
    StorageFolder localFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
    StorageFile localFile = await localFolder.CreateFileAsync("tes.xml", CreationCollisionOption.ReplaceExisting);
    using (IOutputStream writeStream = await localFile.OpenAsync(FileAccessMode.ReadWrite))
    {
        Stream stream = writeStream.AsStreamForWrite();
        DataContractSerializer ser = new DataContractSerializer(typeof(List<FeedItem>));
        ser.WriteObject(stream, wantToBeSaved);
        await stream.FlushAsync();
    }
}

public static async Task<List<FeedItem>> LoadFeedsFromFile()
{
    List<FeedItem> r = new List<FeedItem>();
    StorageFolder localFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
    StorageFile localFile = await localFolder.CreateFileAsync("tes.xml", CreationCollisionOption.ReplaceExisting);
    using (IInputStream readStream = await localFile.OpenAsync(FileAccessMode.Read))
    {
        Stream stream = readStream.AsStreamForRead();
        DataContractSerializer ser = new DataContractSerializer(typeof(List<FeedItem>));
        r = (List<FeedItem>)ser.ReadObject(stream);
    }
    return r;
}

我的程序执行粗线时发现错误。有什么建议吗？

The error is found while my program executes the bold line. Any suggestion?

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