xamarin - What would be a good way to replace a static class used to hold Application settings? -


i have application uses static class store settings:

namespace abc {     public static class ms      {         public static bool abc;         public static bool def;         ...     } }

when app starts goes database , updates of these settings.

i have been told holding them in static class not ideal when doing bindings , adding notification i'm thinking should new class , hold them in instance. if that's case can give me advice. should when application starts , should in constructor of app() if best way how can this. small 4-5 line example big help

public partial class app : application {     public static xxx      public app()     {         as.appupdated = "feb 1, 2017";         as.appversion = "0.1";         initializecomponent();         mainpage = new ms.mainpage();     } }

have @ james montemagno's settings plugin.

https://github.com/jamesmontemagno/settingsplugin

this abstracts away lot of plumbing around settings , persisting them locally. calling 1 of settings anywhere in application becomes simple calling settings.mysettingname.

when comes binding these values view create property them in view model returns value settings. if need can put them in base viewmodel , go there.

public class myviewmodel : baseviewmodel {  }  public class baseviewmodel {      public bool settinga => settings.settinga;      public bool settingb => settings.settingb; }

Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more