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。
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)