我正在使用Xamarin Forms和Azure,尝试在我的移动应用中实现离线同步,以存储Machine
个对象的列表。
在我的处理离线同步的课程中,我有一个名为Initialize()
的功能,用于在手机或平板电脑中设置本地数据库,以进行离线同步
public MobileServiceClient client { get; set; }
IMobileServiceSyncTable<Machine> machineTable;
public async Task Initialize()
{
if (client?.SyncContext?.IsInitialized ?? false)
{
return;
}
var azureUrl = "http://mycoolwebsite.azurewebsites.net";
//Create our client
client = new MobileServiceClient(azureUrl);
//InitialzeDatabase for path
var path = "mylocaldb.db";
path = Path.Combine(MobileServiceClient.DefaultDatabasePath, path);
//setup our local sqlite store and intialize our table
var store = new MobileServiceSQLiteStore(path);
//Define table
store.DefineTable<Machine>();
//Initialize SyncContext -- Populate the local DB!
await client.SyncContext.InitializeAsync(store, new MobileServiceSyncHandler()); //<-- EXCEPTION HERE
machineTable = client.GetSyncTable<Machine>();
// table.PurgeAsync();
}
当我运行此代码时,我在上面突出显示的行上遇到异常。我错过了什么?作为参考,我正在关注this教程。
答案 0 :(得分:2)
事实证明,使用时:
await client.SyncContext.InitializeAsync(store, new MobileServiceSyncHandler());
machineTable = client.GetSyncTable<Machine>();
我需要在public string Id { get; set; }
对象中有一个Machine
变量,因为构建本地数据库的代码需要此字段。如果将其添加到某处的文档中会很好!