Round Entry in Xamarin Froms


In Xamarin Forms Entry control allows a single line of text to be edited. This article demonstrates how to create a custom renderer for the Entry control, enabling developers to override the default native rendering with their own platform-specific customization.

Custom Renderer:

  1. This sample demonstrates a custom renderer for the Entry control, “Enabling developers to override the default native rendering” with their own platform-specific customization.
  2. Custom renderers provide a powerful approach for customizing the appearance and behavior of Xamarin Forms controls. They can be used for small styling changes or sophisticated platform-specific layout and behavior customization.



Step1: Create the Mobile App (Xamarin Forms) Project

Open VisualStudio 2017    File    New    Project    Choose Cross-Platform Template     Choose MobileApp (Xamarin.Forms )    Name it as RoundEntry    Click on OK    Chose .NetStanderd    Click OK

Step2: Creating CustomEntry.cs

Go to Project CustomEntry    Right Click    Add Class CustomEntry.cs



A custom Entry can be created by sub classing the Entry control, as shown in the following code

The CustomEntry control is created in the .NET Standard library project and is simply  ENTRY control. Customization of the control will be carried out in the custom renderer, so no additional implementation is required in the CustomEntry control.


Step2:  Create a class in the Android directory and name it as CustomRenderer.cs

Go to RoundEntry.Android  Right Click   Add Class CustomRenderer.cs



Brief Explanation of the above Code:

Here Added the ASSEMBLY attribute it means like declarations

  • Custom Entry is the name of the placeholder class in your common (PCL or Shared) Forms library.
  • Export Renderer is the name of the actual platform specific implementation class in your iOS/Android/WP project.

Essentially, telling Forms, “when you need to render Custom Entry on Platform X, use the class CustomRenderer.”

  1. Create a subclass of the EntryRenderer class that renders the native control.
  2. Override the OnElementChangedmethod that renders the native control and write logic to customize the control. This method is called when the corresponding Xamarin Forms control is created.
  3. Added an ExportRendererattribute to the custom renderer class to specify that it will be used to render the Xamarin Forms control. This attribute is used to register the custom renderer with Xamarin Forms.


Step 3: Create UI for Round Entry 

File Name: MainPage.xaml

Here for Example I have taken Login Form for better Understand

Here we have to declare the Local Refernce nameSpace in MainPage.xaml

Output: Here we go.. Press Ctrl+F5

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