Passing data between pages Xamarin Shell navigation-CodePudding

I have a Xamarin forms app with a form split across multiple pages, I want to pass the object data to the next or previous page. I am navigating using the Xamarin Shell. What method or setup can I use to achieve this?

The options I am aware of and my perceived issues with them:

JSON string the object and pass it as a parameter.

This seems incorrect as the data is being converted back and forth.

Pass every property of the object as an individual parameter.

Massively long winded with many properties and inflexible to change.

Store the data to a SQLite database.

I would not want to store an incomplete record in the table and using the current SQLiteAsyncConnection, I don't believe I can have 2 tables created from the same class.

CodePudding user response：

Unfortunately, we could only pass simple data now. And this feature will be added in the future: https://github.com/xamarin/Xamarin.Forms/issues/6848 You can create multiple QueryPropertyAttribute to access different data: https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/shell/navigation#pass-data Another approach is to convert the object to a JSON string like:

var jsonStr = JsonConvert.SerializeObject(model); Then pass it when navigating.

CodePudding user response：

Yes,you can pass data using query property attributes .

Navigation data can be received by decorating the receiving class with a QueryPropertyAttribute for each query parameter.

For more, check:https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/shell/navigation#process-navigation-data-using-query-property-attributes .

In addition,another method is to create a global varible in your app, them you can access this varible in your app.

For example:

1.create class MyVariables.csand add static variable for your model (e.g. MyViewModel ) :

public  class MyVariables
{
    public static MyViewModel myViewModel { get; set; } = new MyViewModel { Name = "test1" };
}

MyViewModel.cs

public class MyViewModel
{
    public string Name { get; set; }
}

2.You can modify or modify your variable in your app:

 // modify the variable
 MyVariables.myViewModel.Name = "test2022";

// access the variable
  System.Diagnostics.Debug.WriteLine("the data is: "   MyVariables.myViewModel.Name);