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Great Reads

Introducing Calcium for Xamarin.Forms

by Daniel Vaughan

Create best-in-breed cross-platform MVVM apps using Calcium for Xamarin.Forms.

Xamarin TV Scripts

by Marcelo Ricardo de Oliveira

An entertainment app written in C# language for the Xamarin Forms and Android, using a SQLite local database

Using MVVM to create Tabbed Interfaces with Calcium for Xamarin Forms

by Daniel Vaughan

Create a Xamarin Forms tabbed page or carousel page by binding to a collection of ViewModels; extending beyond the current capabilities of Xamarin Forms.

Xamarin with TinyIoC

by n.podbielski

Use of IoC container in Xamarin on example of TinyIoC

Latest Articles

Xamarin Forms - Validations Made Simple

by Chandru BK

This article will assume you have basic knowledge of C# and Xamarin Forms and shows how to implement the Xamarin Form Validations using simple Data Annotations applied on the models.

Tour of Heroes: MAUI, with ASP.NET Core 8 Backend

by Zijian

A series of articles comparing programmer experiences of Angular, Aurelia, React, Vue, Xamarin and MAUI

Tour of Heroes: Xamarin, with ASP.NET Backend

by Zijian

A series of articles comparing programmer experiences of Angular, Aurelia, React, Vue, Xamarin and MAUI

Generate Icon Sets for Android and iOS in Native Mobile App Development

by Zijian

Use PowerShell scripts to generate icons of native mobile apps

All Articles

Xamarin

Introducing Calcium for Xamarin.Forms

15 Sep 2014 by Daniel Vaughan

Create best-in-breed cross-platform MVVM apps using Calcium for Xamarin.Forms.

Xamarin TV Scripts

31 Mar 2018 by Marcelo Ricardo de Oliveira

An entertainment app written in C# language for the Xamarin Forms and Android, using a SQLite local database

Using MVVM to create Tabbed Interfaces with Calcium for Xamarin Forms

17 Sep 2014 by Daniel Vaughan

Create a Xamarin Forms tabbed page or carousel page by binding to a collection of ViewModels; extending beyond the current capabilities of Xamarin Forms.

Xamarin with TinyIoC

26 Dec 2016 by n.podbielski

Use of IoC container in Xamarin on example of TinyIoC

Fullscreen Video Background Control for Xamarin.Forms

4 Mar 2017 by Junian Triajianto

How to play video as page background, like Spotify and Uber, using Xamarin.Forms with Android and iOS Custom Renderer.

MonoAndroid: Using Fragments in mobile app

21 Nov 2013 by ThatsAlok

Using Fragments in your mobile application.

MonoAndroid: Using TabHost in your mobile applications

21 Nov 2013 by ThatsAlok

TabHost control in MonoAndroid

Remote Controlled LED / Weather Station / Message Display (Part 2 - Xamarin Mobile App)

31 Dec 2016 by Andrew Lai

This is Part 2 of my Raspberry Pi traffic light and weather station project - The mobile app

Android Recycler View with Spinner Item Change Selection and Update UI

25 Sep 2015 by khanzzirfan

This article helps you to understand how to listen to nested controls inside the recycler view and update the view dynamically.

Xamarin and MvvmCross: A Simple Tutorial for Beginners

3 Jan 2018 by NoMoreComputers

Xamarin and MvvmCross: A simple tutorial for beginners

Why does app work incorrectly when downloaded from App Store.

14 Feb 2014 by Yvan Rodrigues

After many weeks I found it. I compared the csproj sections of Release and AppStore builds, and the AppStore had the additional line:FullSince my app uses reflection to invoke the RESTful client library, the linker did not think I needed certain functionality and optimized it away.

Swift vs Xamarin: Swift is free, but what about Xamarin?

7 Apr 2015 by Nitheesh George

Swift is free but iMac and MacBook are not. You may have to upgrade OSX to install a new XCode version. And In a 3 year old Mac, you may not be able to install a latest version of OSX. Ultimately these all are business and business is for making profit and not for helping the people.install...

Which is better Unity or Xamarin

2 Sep 2015 by Afzaal Ahmad Zeeshan

First of all you need to understand the basic different between them so that you can choose which one to use in your case. First of all, Unity3D is a gaming engine and Xamarin is a cross-platform application development framework. Although there purpose is same, but their functionality and...

Using OxyPlot with Xamarin Forms

27 Jan 2017 by S Ravi Kumar (TechieRathore)

In this article, we will learn how to use a few of graph options OxyPlot.

How To Make The ListView Aware Of Data Changes

5 Sep 2017 by dimpant

Learn how to properly use the NotifyDataSetChanged method of the ListViewAdapter to remove items from a ListView

Finger Print Authentication using Xamarin Forms

13 Mar 2018 by Slim Hammami

This is a tutorial which contains the finger print authentication using Xamarin Forms

Custom Dialogs in Xamarin.Forms: Plugin "Rg.Plugins.Popup" Pages Asynchronous

8 Dec 2019 by Abdulrahman Emad

This article proposes a solution for plugging "Rg.Plugins.Popup" asynchronous into your code.

The Dew Review – Visual Studio 2015 Community Edition

12 Nov 2015 by Alvin Ashcraft

Open source software (OSS) development has reached the mainstream .NET community and created a whole new customer segment for development tools. Microsoft has responded to this need by creating the Visual Studio Community Edition.

Xamarin Frame and Disappearing Outline

23 Apr 2016 by n.podbielski

This is another article in the mini series of Xamarin bugs and workarounds for them.

Generating Proxies During Runtime using Reflection.Emit

8 Dec 2016 by n.podbielski

Reflection.Emit is very powerful tool. It creates IL code and since C# is converted into IL too, we have the same functionality as in C# and even more. It is very powerful and at the same time very complicated. Because of that, it is worth discussing how and for what it should be used.

Reflection.Emit

My New Tool For Creating Xamarin App Icons

27 Mar 2017 by S Ravi Kumar (TechieRathore)

This is my new tool for creating Xamarin app icons

Fire Somebody, Anybody - Or Go Home ...

3 Apr 2017 by GrumpyPants

VS 20017 + Xamarin: can't reference a new Portable Library straight out of the box - another failure of a very basic function

Automatic Scrolling to Edited Text Box in Xamarin Android

7 May 2017 by n.podbielski

Fixing hiding text box controls by software keyboard on Xamarin Android

Xamarin Mobile Apps Continuous Integration and Delivery with Jenkins and HockeyApp

29 May 2017 by Junian Triajianto

Building and distribution automation for Xamarin apps to make your life easier and simpler.

Xamarin Notes - Set Up the Environment (Windows and IOS)

5 Jan 2018 by didourebai

How to set up Xamarin Notes environment

Async Commands with Codon FX

1 Apr 2018 by Daniel Vaughan

Learn how to leverage the asynchronous ICommand implementation in Codon FX to support commands that kick-off long-running operations.

Generate Icon Sets for Android and iOS in Native Mobile App Development

13 Nov 2023 by Zijian

Use PowerShell scripts to generate icons of native mobile apps

Xamarin Forms Integration with Google Admob

24 Jan 2019 by Harshit Gindra

This article with help monetize your Xamarin Forms app using Google Admob. This article shares different implementations for Xamarin.iOS and Xamarin.Android.

Which is better Unity or Xamarin

2 Sep 2015 by rashidebad

Unity-vs-Xamarin[^]

Is it possible to install XAMARIN for visual studio 13?

7 Nov 2017 by Kornfeld Eliyahu Peter

Not really... The installer currently available will look back to 2015 only... However Visual Studio Community Edition 2017 is free and supporting Xamarin fully... It also works side-by-side with older versions (I have 2008, 2010, 2015 and 2017 installed on the same machine)...

Xamarin Questions & Answers

28 Apr 2018 by MilanGohil

This article contains possible basic questions along with their answers to help you to understand or gain basic knowledge about Xamarin.

How can get sum for _price ?

7 May 2018 by User 7429338

You can use Enumerable.Sum Method (System.Linq)[^]: _price = receiptData.Sum(element => element.Price);

How to convert string to datetime?

21 Feb 2019 by Korlakunta

DateTime myDate = DateTime.ParseExact("2013-02-11T14:29:01", "yyyy'-'MM'-'dd'T'HH':'mm':'ss", System.Globalization.CultureInfo.InvariantCulture); I have used 2013-02-11T14:29:01 instead of 2013-02-11T14:29:01-05:00 and its showing date time as per the requirement. Thank You

Build Xamarin Apps Faster With BaaS

26 Aug 2019 by robertcarlson8203

Learn how to quickly build mobile apps using a Xamarin with a cloud hosted mobile backend in minutes.

Could I split value base64string from image in mobile and send base64string to data

16 Dec 2019 by OriginalGriff

You can do it - it's not even complicated - but you may find you need more than one field: two fields will only hold 2* 64K = 128K and it;s very easy for a modern image to exceed that. Instead of reading the whole image: fs.Read(ImageData, 0, System.Convert.ToInt32(fs.Length)); Just read the max...

Xamarin Picker with ID-based Binding

27 Apr 2020 by DRappJr

Allow picker to show selected item by a bound ID such as by key/value list choices

Adaptive Layouts for Different Device Sizes in Xamarin Apps

6 Jan 2021 by Ana Carolina Zambon

In this post, you will learn how to make Apps have a fluid and adaptive UI on different device screen sizes.

Ms SQL database connection xamarin

20 Nov 2023 by Dave Kreskowiak

You don't listen much, do you? As stated in your other copy of this same question, for a Xamarin app, you should NOT be connecting directly to a database engine. You SHOULD be calling a web service that sits in front of your SQL Server where the...

Tour of Heroes: MAUI, with ASP.NET Core 8 Backend

8 Dec 2023 by Zijian

A series of articles comparing programmer experiences of Angular, Aurelia, React, Vue, Xamarin and MAUI

Is it possible to connect SQL Server with Andriod app in Xamarin?

30 Jun 2014 by Kornfeld Eliyahu Peter

Yes.Read this - http://developer.xamarin.com/guides/cross-platform/Application_Fundamentals/Web_Services/[^]

Is it possible to connect SQL Server with Andriod app in Xamarin?

10 Oct 2014 by Dominic Burford

If you wrap your SQL calls in a web service then you can invoke them in your Android app.

Is it possible to connect SQL Server with Andriod app in Xamarin?

2 Nov 2014 by Ullas_Krishnan

Hi,Yes you can create all functionality which developed in web asp.net grid etc..For Grid functions use List View, which can be custom designed to view all items in a grid ..For connecting it to SQL Server write WCF / JSON format service.. and host the service in web server....

Convert from DateTime? to NSDate

13 Jan 2015 by Snesh Prajapati

It seems you need to write total 4 methods - 2 for each direction of conversion - we need to write an extension method for each type (nullable and not nullable) and you cannot club them in one method as given...

How to make a android app using asp.net mvc c#

13 Apr 2015 by Dave Kreskowiak

Do you understand what an ASP.NET application is? It's an application hosted on a web server, not on the client device.What you ask doesn't make any sense.

Search & Select mechanisms in C#

26 Oct 2017 by Oliverar

I am using Xamarin in C#, to build a cross platform BLE app. It is based on this example app using the Monkey.Robotics plugin. All the examples use a ObservableCollection devices; line, to populate a ListView with all the scanned results which the user can then manually select, setting...

Let's Build iOS App in Xamarin.iOS Part II - iOS Terminology

14 Feb 2016 by SubhamoyBurman

MVC and other popular iOS terminology

Getting values from edittext into string variable and apply validations in xamarin android.

24 Feb 2016 by Richard MacCutchan

You do not need to call ToString() on a text field, it is already a string. A call to getText() will return the string containing the item's text - see EditText | Android Developers[^].

Xamarin android development, scroll view 'scrollchange' event when attached to delegate throws runtime error !

29 Feb 2016 by Er. Puneet Goel

My team is working on Xamarin Android Development. In a view I have a scrollView and i am using 'ScrollChange' event of scrollview to detect scroll movement and performing required actions. It works fine for my machine. But when i used the same code on another machine, i am getting runtime error...

Xamarin android development, scroll view 'scrollchange' event when attached to delegate throws runtime error !

1 Mar 2016 by Er. Puneet Goel

After spending couple of hours, i make few changes to my code and now its working fine. Earlier I was using following code to attach the delegate.ScrollView ScrollView1 = (ScrollView)FindViewById(Resource.Id.ScrollView1); ScrollView1.ScrollChange +=...

Xamarin Frame and Style with Padding

23 Apr 2016 by n.podbielski

Xamarin Frame and Style with Padding

Xamarin Style Based On Implicit Style

23 Apr 2016 by n.podbielski

If you are using Styles in Xamarin, you probably know how to define implicit styles. But how to inherit from them in other Styles? It is possible but require so work. Here is how you can do it.

Configure App Icons in Xamarin Forms App

14 Jun 2016 by S Ravi Kumar (TechieRathore)

Configure App Icons in Xamarin Forms App

Xamarin or kony which is better IDE for mobile applications ?

30 Jun 2016 by OriginalGriff

I'd suggest that as far as IDE's go, you can't do much better than Visual Studio - and now that it supports Xamarin and Xamarin Forms, that could well be the way to go.I just wish there was a visual designer for Forms instead of having to "hand crank" the XML. :sigh:

How to take user input as string and check against an array to produce some message ?

10 Sep 2016 by BillWoodruff

Here's an example of how you might validate input:string input=Console.ReadLine ();if (input == "") Environment.Exit(-1); // handle user entered nothing ? input = input.Trim().ToLower(); // get rid of white-space, make all lower-casestring destination =...

Hiding entry control on selection of picker value

15 Feb 2017 by Sandesh M Patil

I am currently learning xamarin.forms. I developed simple application for additon of Employee in SQLiteIn this app there is picker control(like dropdown in .Net :)). When i select Other option in this picker i want to show/ hide entry control (like textbox in .net :))In .net we show hide...

Xamarin visual studio 2015 sha1 signature

28 Jan 2017 by OriginalGriff

The only way to get an identical SHA-1 signature is to have identical contents: that's the whole idea of using an SHA-1 hash value. If they are different, then the content is different, and probably not valid - that is the whole idea.If you have a different hash, then it may be as simple as...

Kill AXML - Programmatic ListViews in Xamarin Android

27 Mar 2017 by Lee P Richardson

Kill AXML - Programmatic ListViews in Xamarin Android

Getting Started with Xamarin Forms for Mac Preview

31 May 2017 by S Ravi Kumar (TechieRathore)

How to get started with Xamarin Forms for Mac preview

Unable to navigate in xamarin cross plateform application

2 Aug 2017 by Member 12967177

( await Navigation.PushAsync(new MainForm()); ) Remove await and try

How can I read data of a csv and put in a listview?

8 Aug 2017 by didourebai

Hello, Could you see this article : Reading and Writing CSV Files in C#[^] and to customize a ListView's Appearance please see this course : Part 3 - Customizing a ListView's Appearance - Xamarin[^]

Xamarin.firebase.common not compatible with xamarin.firebase.auth

25 Aug 2017 by Graeme_Grant

I would uninstall: 42.1024.0-beta1 constraint: Xamarin.Firebase.Common (= 42.1024.0-beta1) and then reinstall: NuGet Gallery | Xamarin.Firebase.Storage.Common 42.1021.1[^] before NuGet Gallery | Xamarin.Firebase.Storage 42.1021.1[^]

Facebook & LinkedIn Login with Firebase and Xamarin

12 Sep 2017 by amartya mandal

Facebook & LinkedIn login with Firebase and Xamarin

Do I need a bigger computer to develop a social networking app

25 Jan 2018 by David_Wimbley

Unless you are building something that takes gobs of memory and hard drive space, your laptop is fine to develop your application on and then deploy what is built out to a server. For example an API for your App probably shouldnt be running on your laptop in a production environment but having...

Where do I start learning csharp? Can you refer some good resources?

28 Jan 2018 by OriginalGriff

For Xamarin dev generally, I recommend Creating Mobile Apps with Xamarin.Forms Book First Edition - Xamarin[^] - it's free and very good. But first, get C# sorted, which will take a while if you aren't familiar with the way .NET works - there is a lot to learn! Have a look locally for a course,...

XF 3.0 New Feature: Create WPF Application using Xamarin.Forms

17 May 2018 by S Ravi Kumar (TechieRathore)

Creating WPF applications using Xamarin.Forms

How to Fetch Contacts in Xamarin iOS?

30 May 2018 by Suchit R. Khunt

In this article, the purpose of the code is to fetch contact details from iOS device.

How to connect xamarin forms app to SQL server management studio

29 Jun 2018 by #realJSOP

You can't connect ANY app to SSMS. SSMS is a tool used to manage a SQL Server instance. What I think you *really* want to do is to connect the app to a SQL Server database. If it were me, I'd develop a web service that could be used to connect to the database. Any app can connect to a web service.

Is GIT repository what a new coder needs in order to con’t coding?

7 Oct 2018 by Dave Kreskowiak

If you're looking to hire someone to work on a project, Code Project is not the place for that. Try Freelancer.com. Be warned, you get what you pay for.

Is GIT repository what a new coder needs in order to con’t coding?

7 Oct 2018 by OriginalGriff

No. Depends what is in the repository. Code is part of the project, and often not the big part - it's the bit which makes it work, but without the design documents it ca take a considerable amount of time to get up to speed with how the code works - or is meant to work - before you can start...

Xamarin Forms: Check and Request for Permissions

11 Jan 2019 by Harshit Gindra

Check and request for Permissions in Xamarin Forms mobile application

How to convert string to datetime?

21 Feb 2019 by Richard MacCutchan

Google found DateTime.TryParseExact Method (System) | Microsoft Docs[^] in microseconds.

Real-time Emotion Detection with Azure Cognitive Services

15 Apr 2019 by Afzaal Ahmad Zeeshan

Integrating Cognitive Services SDKs in a .NET Core based application and exploring how real-world scenarios can be tackled using ML services offered by Microsoft

machine-learning

Why You Really Need META-PROGRAMMING COMMANDS CONTRACTS.

9 Sep 2019 by DotnetShtien

In this article we will dicuss when new feature added recently to the meta-programming library which is the command contracts.

Best overloaded method has some invalid arguments

27 Oct 2019 by OriginalGriff

The ImageSource.FromUri(Uri) Method (Xamarin.Forms)[^] expects a URI class instance as it's single parameter, not a string. Try this: viewModel.Image = ImageSource.FromUri(new URI(string.Format(...)));

Why I cannot send base64 sting to my database SQL

3 Jan 2020 by OriginalGriff

Simple: you are doing this in a very, very dangerous way. Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Always use Parameterized queries instead. When you concatenate strings,...

How to close my app when I click button back in xamarin form

22 Jan 2020 by Ankur Ramanuj

Your code is perfect for closing app. It might be becaause of thread can you try this if (AcceptBack) return false; Device.BeginInvokeOnMainThread(async () =>{ PromptForExit();}); return true; In OnBackButtonPressed.

Spaces between control on xamarin

26 May 2020 by Maciej Los

I'd suggest to read these articles: Layout Options in Xamarin.Forms - Xamarin | Microsoft Docs[^] Xamarin Forms LayoutOption Differences - Xamarin Help[^]

Xamrain.form sqlite update table

8 Jul 2020 by Chris Copeland

The Where method expects a function where the parameter is the object instance. If you compare what you've written in your Select method to this method, you can see that you've forgotten to declare the parameter as x => Lambda expressions - C#...

How do a user select to display 1 out of two (or more) fields on a single label in xamarin

19 Nov 2020 by Gerry Schmitz

When you create your "item source collection", assign either the VALUE of "email" OR "address" to the "display field" (column), and just display what's in that column. Easier than what you're trying to do.

What cross platform framework to use to build a children's educational app for mobile?

9 Mar 2021 by Richard MacCutchan

See Xamarin.Essentials - Xamarin | Microsoft Docs[^], but you need to be a reasonably experienced programmer.

How to show pdf from bytes data in cross platform xamarin

14 Jun 2021 by Richard Deeming

You forgot to tell us what the problem is. Fortunately, it's pretty obvious: a website cannot access files on the user's device. You are asking a page hosted on drive.google.com to display a file stored in your local application data folder....

How to received notification even app is closed?

23 Sep 2021 by OriginalGriff

They add a Service to the app, which is what handles notifications. It's separate from the "actual app" and runs in the background permanently: Creating a Service - Xamarin | Microsoft Docs[^]

How do I get X, Y values from skiasharp canvasview 'touch' event?

8 Nov 2021 by Member 11298827

I want to get screen X and Y values from a 'Touch' event on a SkiaSharp CanvasView. The event fires okay, but the eventargs e does not let me access the X and Y values directly. Instead, I have to dig them out of the string e.toString() as...

How do I get X, Y values from skiasharp canvasview 'touch' event?

8 Nov 2021 by Gerry Schmitz

You're using the "wrong" signature (and namespace?) to get the event argument for ".Location" (x and y). You want SKTouchEventArgs. SKCanvasView.OnTouch(SKTouchEventArgs) Method (SkiaSharp.Views.Forms) | Microsoft Docs[^]

Firebase push notification

19 Apr 2022 by Vimalsoft(Pty) Ltd

Good Day As you know a lot of HUAWEI phones don't support Firebase Push notification . Is there a way i can check in Xamarin forms if a phone support Firebase push so that i implement a different Push for that phone programmatically ? Thanks ...

How do I convert my screenshot which is .png to binary?

31 May 2022 by OriginalGriff

Once you have it as a PNG file, it's already binary data - just read the file into a byte array and you are good to go. But ... OpenReadAsync returns a Stream - so why not just use the data from that directly instead of going via a file? Have...

Calculator project - equals operator help

21 Oct 2022 by PIEBALDconsult

From what I can tell... You put the first operand (X) in firstNumber. Then you put the second operand (Y) in secondNumber. Then you perform the operation, which is fine so far. Then when you click Equal again, you are putting the result (X op Y)...

Xamarin save data to database

7 Sep 2023 by Richard MacCutchan

Statements such as: DependencyService.Get().UpdateEmployee(employeeDetails); are a bad idea. If the Get call fails for any reason then a NullPointerException will follow. And since your code is not catching exceptions you will likely...

Cloud database instead of local xamarin

8 Sep 2023 by CHill60

It's not clear at all why you are having a problem - if you could type in the original connection string then you can overtype it with your new one. Perhaps one of these resources will help you Google for Xamarin edit connection string[^]

Xamarin VS 2022 problem

15 Oct 2023 by M Imran Ansari

In Xamarin, especially for Android development, the usage of System.Web.Services and System.Web.Services.Protocols is not supported. These namespaces are typically used in traditional .NET web applications and not in the context of mobile...

Tour of Heroes: Xamarin, with ASP.NET Backend

18 Nov 2023 by Zijian

A series of articles comparing programmer experiences of Angular, Aurelia, React, Vue, Xamarin and MAUI

Calculate sum of column sati in listview in C#

22 Jan 2024 by Pete O'Hanlon

So, you might want to write something like this:long runningTotal = 0; while (rd.Read()) { string sati = string.Empty; if (!rd.IsDBNull(rd.GetOrdinal("SATI")) { int satiVal = rd.GetInt32(rd.GetOrdinal("SATI")); runningTotal +=...

How to read/write data to serial port in xamarin.android ?

11 Nov 2017 by Richard MacCutchan

OTG Android Xamarin C - Google Search[^].