CODEWITHSUNDEEP
c#windows-phone-8data-binding
GaneshGawali
GaneshGawali

Reputation: 41

Data Binding with textbox in windows phone 8

I have following code in XAML

<Text Box x:Name="Text_Mobile_Number" 
          Height="70" Width="450" 
          Margin="24,250,0,0" 
          Text="{Binding Path=Mobile_No, Mode=Twoway, UpdateSourceTrigger=Explicit}">

I tried to bind text_box with property Mobile_No,which is define in View_Model:

private string _mobile_No;
public string Mobile_No
{
    get
    {
       return _mobile_No;
    }
    set
    {
       if(_mobile_No != value)
           _mobile_No = value;
           RaisePropertyChanged("Mobile_No");
    }
}

and in C# i wrote a function where i called a service,through which i will get the mobile no,and i wrote that function in viewmodel too.

but now when i call that function on click event of button the call not goes to the properties,so it didn't set the mobile no in that properties. following is my function call:

private async void Next_AppBarIconButton_Click(object sender, EventArgs e) 
{
    LogInViewModel view_Model = new LogInViewModel();    
    var tuple = (Tuple<bool, string>)await view_Model.Get_Verification_Code();
}

but its not working properly,wen i assign actual text box value that is Mobile_No=Text_box.text then it works fine,function retrieve that value

My actual function:

public async Task<object> Get_Verification_Code()
{
   var flag = false;
   string message="";
   var result = (Tuple<string, string, string>)await service.Get_Verification_Code(Mobile_No,"sign_in");
}

so please suggest any solution for this,i don't want to manually set text box value to the property Mobile_No.

I have tried all the option and searches all snippets related to text box binding,but not getting where i was wrong in code,please tell me any solution.Thank you

Upvotes: 0

Views: 461

Answers (1)

Muhammad Saifullah
Muhammad Saifullah

Reputation: 4292

you are creating new instance of the ViewModel in your button click method so this new instance will not have the values.

Add the following 2 lines of code at the end of your view(MainPage.xaml.cs)

public MainPage()
{
    InitializeComponent();
    LoginViewModel vm = new LoginViewModel();
    this.DataContext = vm;
}

Update this method to as follows

private async void Next_AppBarIconButton_Click(object sender, EventArgs e) 
{
    LogInViewModel view_Model = this.DataContext as LoginViewModel; 
    //Now you have the instance which binded to your view which contains all the data.   
    var tuple = (Tuple<bool, string>)await view_Model.Get_Verification_Code();  
}

P.S: I would recomend to use GalaSoft MVVM Light framework for you mvvm application

Hope this helps

Upvotes: 1

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