使用Azure应用服务与.net后端脱机同步。它工作得很好但是当我直接从服务器数据库中删除一行时，它在移动应用程序上单击刷新按钮后不会同步（更新）但如果我编辑任何名称属性，它会在单击刷新按钮后自动同步。据我所知，如果我删除服务器数据库中的任何行，它还应自动更新移动列表，因为它在编辑任何行后更新。 任何帮助！所以如果从数据库中删除一行然后刷新后显示新的更新数据库列表，我可以使其正常工作吗？
以下是toDoactivity.cs类
public class ToDoActivity : Activity
{
//Mobile Service Client reference
private MobileServiceClient client;
//Mobile Service sync table used to access data
private IMobileServiceSyncTable<ToDoItem> toDoTable;
//Adapter to map the items list to the view
private ToDoItemAdapter adapter;
//EditText containing the "New ToDo" text
private EditText textNewToDo;
const string applicationURL = @"https://my2doservice.azurewebsites.net";
const string localDbFilename = "local.db";
protected override async void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Activity_To_Do);
CurrentPlatform.Init();
// Create the Mobile Service Client instance, using the provided
// Mobile Service URL
client = new MobileServiceClient(applicationURL);
await InitLocalStoreAsync();
// Get the Mobile Service sync table instance to use
toDoTable = client.GetSyncTable<ToDoItem>();
textNewToDo = FindViewById<EditText>(Resource.Id.textNewToDo);
// Create an adapter to bind the items with the view
adapter = new ToDoItemAdapter(this, Resource.Layout.Row_List_To_Do);
var listViewToDo = FindViewById<ListView>(Resource.Id.listViewToDo);
listViewToDo.Adapter = adapter;
// Load the items from the Mobile Service
OnRefreshItemsSelected();
}
public async Task InitLocalStoreAsync()
{
// new code to initialize the SQLite store
string path = Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), localDbFilename);
if (!File.Exists(path)) {
File.Create(path).Dispose();
}
var store = new MobileServiceSQLiteStore(path);
store.DefineTable<ToDoItem>();
// Uses the default conflict handler, which fails on conflict
// To use a different conflict handler, pass a parameter to InitializeAsync. For more details, see http://go.microsoft.com/fwlink/?LinkId=521416
await client.SyncContext.InitializeAsync(store);
}
//Initializes the activity menu
public override bool OnCreateOptionsMenu(IMenu menu)
{
MenuInflater.Inflate(Resource.Menu.activity_main, menu);
return true;
}
//Select an option from the menu
public override bool OnOptionsItemSelected(IMenuItem item)
{
if (item.ItemId == Resource.Id.menu_refresh) {
item.SetEnabled(false);
OnRefreshItemsSelected();
item.SetEnabled(true);
}
return true;
}
private async Task SyncAsync(bool pullData = false)
{
try {
await client.SyncContext.PushAsync();
if (pullData) {
await toDoTable.PullAsync("allTodoItems", toDoTable.CreateQuery()); // query ID is used for incremental sync
}
}
catch (Java.Net.MalformedURLException) {
CreateAndShowDialog(new Exception("There was an error creating the Mobile Service. Verify the URL"), "Error");
}
catch (Exception e) {
CreateAndShowDialog(e, "Error");
}
}
// Called when the refresh menu option is selected
private async void OnRefreshItemsSelected()
{
try
{
await SyncAsync(pullData: true); // get changes from the mobile service
await RefreshItemsFromTableAsync(); // refresh view using local database
}
catch(Exception e)
{
CreateAndShowDialog(e, "Error");
}
}
//Refresh the list with the items in the local database
private async Task RefreshItemsFromTableAsync()
{
try {
// Get the items that weren't marked as completed and add them in the adapter
var list = await toDoTable.Where(item => item.Complete == false).ToListAsync();
adapter.Clear();
foreach (ToDoItem current in list)
adapter.Add(current);
}
catch (Exception e) {
CreateAndShowDialog(e, "Error");
}
}
public async Task CheckItem(ToDoItem item)
{
if (client == null) {
return;
}
// Set the item as completed and update it in the table
item.Complete = true;
try {
await toDoTable.UpdateAsync(item); // update the new item in the local database
await SyncAsync(); // send changes to the mobile service
if (item.Complete)
adapter.Remove(item);
}
catch (Exception e) {
CreateAndShowDialog(e, "Error");
}
}
[Java.Interop.Export()]
public async void AddItem(View view)
{
if (client == null || string.IsNullOrWhiteSpace(textNewToDo.Text)) {
return;
}
// Create a new item
var item = new ToDoItem {
Text = textNewToDo.Text,
Complete = false
};
try {
await toDoTable.InsertAsync(item); // insert the new item into the local database
await SyncAsync(); // send changes to the mobile service
if (!item.Complete) {
adapter.Add(item);
}
}
catch (Exception e) {
CreateAndShowDialog(e, "Error");
}
textNewToDo.Text = "";
}
private void CreateAndShowDialog(Exception exception, String title)
{
CreateAndShowDialog(exception.Message, title);
}
private void CreateAndShowDialog(string message, string title)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.SetMessage(message);
builder.SetTitle(title);
builder.Create().Show();
}
}
答案 0 :(得分：2)
您可能需要在服务器上启用软删除。在服务器初始化代码中添加以下内容：
DomainManager = new EntityDomainManager<TodoItem>(context, Request, enableSoftDelete: true);
软删除允许您通知您的客户已删除记录。删除记录时，它只是标记为已删除。这允许其他客户端下载新状态并更新其脱机同步缓存。
要了解详情，请参阅30 Days of Zumo.v2 (Azure Mobile Apps): Day 19 – ASP.NET Table Controllers。