我需要序列化和反序列化的列表,并把它写在JSON文件以供以后使用。
我成功地反序列化的文件,但未能序列化之后写的。我怎样才能做到这一点?
这是我写的代码。
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);
数据格式类 -
[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));
}
}
此外,如果有什么办法,只是添加几行现有的文件,而无需更换所有的文字,请让我知道。
看看下面的代码是你所需要的。我不敢肯定是否意味着你不知道如何写流。
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);
}