Which Type of Data Binding Mode in Xamarin Affects the Source Due to the Changes in Target?


Heather Bennett

Which Type of Data Binding Mode in Xamarin Affects the Source Due to the Changes in Target?

Data binding is a crucial concept in Xamarin development. It allows us to establish a relationship between the user interface (UI) elements and the underlying data model.

Xamarin provides different data binding modes that determine how changes in the Target (UI) affect the source (data model). In this article, we will explore which type of data binding mode affects the source due to changes in the Target.

OneWay Data Binding

In OneWay data binding mode, changes made to the Target will affect the source, but not vice versa. This means that when you update the UI element’s value, it will update the corresponding property in the data model. However, if you modify the property value directly in the data model, it won’t reflect in the UI element.

Let’s consider an example where we have a label displaying a user’s name:

<Label Text="{Binding UserName, Mode=OneWay}" />

In this case, any changes made to the UserName property in our data model will be reflected in the label. However, modifying the label’s text won’t affect our UserName property.

TwoWay Data Binding

TwoWay data binding mode establishes a bidirectional relationship between UI elements and their corresponding properties. This means that changes made to either side will automatically update both sides.

For instance, let’s consider a scenario where we have an entry field for editing a user’s email:

<Entry Text="{Binding UserEmail, Mode=TwoWay}" />

In this case, if you modify UserEmail via code or by typing directly into the entry field, the changes will be reflected in both the entry field and the UserEmail property. Similarly, if you update the UserEmail property in your data model, it will automatically update the entry field.

OneTime Data Binding

The OneTime data binding mode sets the initial value of a UI element based on the source property but doesn’t establish a continuous synchronization. Once the initial value is set, changes made to either side won’t affect each other.

Consider an example where we want to display a user’s age:

<Label Text="{Binding UserAge, Mode=OneTime}" />

In this case, when the label is first rendered, it will display the value of UserAge. However, subsequent changes to UserAge won’t be reflected in the label.


In conclusion, different data binding modes in Xamarin have varying effects on how changes in Targets (UI) affect sources (data models). OneWay mode allows changes in UI elements to update source properties while TwoWay mode establishes a bidirectional relationship. On the other hand, OneTime mode only sets an initial value without further synchronization.

Understanding these data binding modes is crucial for effective Xamarin development as it enables us to create dynamic and responsive user interfaces that interact seamlessly with our data models.

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