如何将序列化流转换为字符串?

时间:2019-02-03 12:08:15

标签: c# json serialization uwp memorystream

我需要序列化和反序列化列表,然后将其写入JSON文件中,以便以后使用。

我成功地对文件进行了反序列化,但是在序列化后无法写入。我该怎么办?

这是我编写的代码。

StorageFile savedFile = await storageFolder.GetFileAsync("SavedData.json");
string text = await FileIO.ReadTextAsync(savedFile);
var serializer = new DataContractJsonSerializer(typeof(DataFormat));
var ms = new MemoryStream(Encoding.UTF8.GetBytes(text));
List<DataFormat> data = (List<DataFormat>)serializer.ReadObject(ms);
        if (data == null)
        {
            data = new List<DataFormat>();
        }
        data.Add(new DataFormat
        {
            firstName = fnbox.Text,
            lastName = lnbox.Text,
            country = cbox.Text
        });

MemoryStream stream = new MemoryStream();
DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(DataFormat));
ser.WriteObject(stream, data);

DataFormat类-

[DataContract]
public class DataFormat : IEquatable<DataFormat>
{
    [DataMember]
    public string firstName{ get; set; }
    [DataMember]
    public string lastName { get; set; }
    [DataMember]
    public string country { get; set; }
    public bool Equals(DataFormat other)
    {
        if (other == null)
        {
            return false;
        }

        return (firstName.Equals(other.firstName));
    }

}

另外如果有任何方法可以将行添加到现有行中 文件而不替换所有文本,请让我知道。

2 个答案:

答案 0 :(得分:0)

查看下面的代码是否是您所需要的。我不确定您是否表示不了解如何编写流式传输。

  private async void Button_Click(object sender, RoutedEventArgs e)
    {
        Windows.Storage.StorageFolder storageFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
        Windows.Storage.StorageFile sampleFile =await storageFolder.GetFileAsync("sample.json");
        DataFormat data = new DataFormat();
        data.firstName = "Barry";
        data.lastName = "Wang";
        data.country = "China";
        Stream mystream = await sampleFile.OpenStreamForWriteAsync();          
        DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(DataFormat));
        ser.WriteObject(mystream, data);
    }

答案 1 :(得分:-1)