在 IsolatedStorage中存取 Serialized Data (ver xml)
在coding時，我們很常遇到，將物件直接儲存起來，需要的時候讀進來就可以馬上使用，不需要在重新設定屬性
感謝 IsolatedStorage ，讓我們可以用這種方式，將物件儲存起來，需要使用時候可以讀進來就可以使用了
基本上做法
(1) 儲存物件: 跟存取檔案系統一樣，但需要儲存物件序列化後的資料
(2) 讀取物件: 同上，但要將序列化後的資料 經過 反序列化的程序
需要使用 序列化工具 XmlSerializer
namespace System.Xml.Serialization
加入參考 “System.Xml.Serialization.dll”
IsolatedStorageFile
namespace System.IO.IsolatedStorage
片段程式
材料:
1: public class CustomerModel : INotifyPropertyChanged
2: {
3: public string CustFirstName { get; set; }
4:
5: public string CustLastName {get; set; }
6:
7: ....................
8:
9: public event PropertyChangedEventHandler PropertyChanged;
10:
11: private void RaisePropertyChanged(string propertyName)
12: {
13: if (PropertyChanged != null)
14: {
15: PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
16: }
17: }
18: }
儲存物件:
1: public void SaveItemToSerialize(CustomerModel item)
2: {
3: if (item == null) return;
4:
5: try
6: {
7: using (var serstore = IsolatedStorageFile.GetUserStoreForApplication())
8: using (var serstream = serstore.CreateFile("customer.xml"))
9: using (var serwriter = new StreamWriter(serstream))
10: {
11: XmlSerializer ser = new XmlSerializer(typeof(CustomerModel));
12: ser.Serialize(serwriter, item);
13: writer.Close();
14: }
15: }
16: catch (InvalidOperationException)
17: {
18: Message.Show("Save Fail");
19: }
20: }
讀取物件:
1: try
2: {
3: CustomerModel DeserializeCustomerModel=null;
4: using (var serstore = IsolatedStorageFile.GetUserStoreForApplication())
5: if (serstore.FileExists("customer.xml"))
6: {
7: using (var serstream = serstore.OpenFile("customer.xml", FileMode.Open))
8: {
9: XmlSerializer ser = new XmlSerializer(typeof(CustomerModel));
10: DeserializeCustomerModel = ser.Deserialize(serstream) as CustomerModel;
11: stream.Close();
12: }
13: }
14: callback(...);
15:
16: } catch (InvalidOperationException ex)
17: {
18: callback(...);
19: }