How to Make a app acording to language change - mvvm

Question

I developed an app that can support two languages. Going beyond that if I need this app for support with many languages. let assume ten languages how to accomplish this requirement
Now what I do is Hard cording it with both languages I used and then retrieve it. If I going to do that for ten languages it does not sound good is there any smart way to do this.
as an example;
I doing with MVVM pattern In my View Model. I use the property and do this its simple way of doing
public string GetPageTitle => AppResources.VitalSignsViewPage_Title;
and my resource file I have two data set if the language has changed it will use write dataset this is what I am doing right now is there any proper smart way to this to many languages.

Answer 1

There is some solutions to achive this. I recommend to you basic
solution ,
Here is an interface for Language Service (It is optionally , if you
using Dependency Injection):
public interface ILanguageService
{
string GetString(string text);
void ChangeLanguage(bool isALang);
bool IsALanguage();
}
You can create a service for localization :
namespace Service.Language
{
public sealed class LanguageService : ILanguageService
{
List<LanguageRow> LanguageList;
private bool IsFirstLang;
public LanguageService()
{
LanguageList = JsonHelper.ReadJSON<List<LanguageRow>>("Service.Language.MultiLanguage.json", typeof(LanguageService));
IsFirstLang = true;
}
public void ChangeLanguage(bool IsFirstLang)
{
IsFirstLang = !IsFirstLang;
}
public bool IsALangueage()
{
return IsFirstLang;
}
public string GetString(string text)
{
string result;
try
{
var row = LanguageList.FirstOrDefault(i => i.Code.Equals(text));
result = IsFirstLang? row.Values[0] : row.Values[1];
}
catch
{
result = text;
}
return result;
}
}
}
Here is a model to serialization for json :
public class LanguageRow
{
public LanguageRow()
{
Values = new List<string>();
}
public string Code { get; set; }
public List<string> Values { get; set; }
}
At last, here is json file : (EN-FR)
[
{
"Code": "VitalSignsViewPage_Title",
"Values": [ "Page Title", "Titre de la page" ]
},
{
"Code": "VitalSignsViewPage_SubTitle",
"Values": [ "Sub Title", "Sous-titre" ]
},
{
"Code": "VitalSignsViewPage_SubSubTitle",
"Values": [ "Sub Sub Title", "Sous sous-titre" ]
}
]
You can access translations like :
ILanguageService _langService = new LangService()
_langService.GetString(AppResources.VitalSignsViewPage_Title);