A quick reference guide to common markup extensions used in Xamarin Forms XAML. Xamarin’s intellisense is not as powerful as WPF’s, nor are the markup extensions of XAML the same between WPF or Xamarin Forms and if you come from a web background, XAML may seem rather confusing at first. Here are some of the more common or desired markup extensions you can do in Xamarin Forms XAML. This article is for developers who have a basic understanding of binding. If you don’t have a read through Data Binding Basics from Xamarin first.
Markup Extensions
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In keeping it as basic as possible, markup extensions are what occurs between the curly brackets. { . extension … } and includes the extension name and some parameters or values to help it perform its function. For example
- Binding
- StaticResource
- TemplateBinding
This cheat sheet - or HTML code quick reference - lists the common HTML tags and their attributes, grouped into relevant sections in an easy-to-read format. Perhaps check out where to start or what is html first:-). 1 day ago That's why I created this cheat sheet with the nine most common tasks you will perform on a regular basis with React and JSX. I ordered them in the way I typically stumble upon them when building an application. In the examples below, the first code snippet will show the syntax, and the second one will show how to use it with real data.
These are markup extensions and what goes after them are parameters these functions use to complete their purpose. E.g. Binding takes a Property Name to bind to.
Binding to Data Source
Starting out with the basics, here is where you can bind a BindableProperty to the BindingContext. The BindingContext is a property on the Page (or any BindableObject) that you assign an object to. Anything you try to Bind in the XAML will try to match to a property in this object. If no property exists, Xamarin Forms uses a default value to pass back to the page.
Binding Mode
By default the BindingMode of any element is OneWay, meaning that it will listen to updates from the BindingContext, but won’t send them back if changed in the View. Many controls such as the Entry have the default changed to TwoWay to ensure anything typed in the Entry goes back to the BindingContext. However if you have a control that has a BindingMode you don’t want, you can override it by specifying the BindingMode in XAML.
Making a label TwoWay is not really useful but just there to illustrate the point.
Multiple Source Binding
A tricky situation is normally when you are in a repeating control, such as a ListView or CarouselView. These controls take a DataTemplate and then repeat that template for each item in the ItemsSource. However when you use Binding you are binding to the particular item in the ItemsSource and not the main page, hence if you want to the main BindingContext you will need to specify a Source property.
As shown below, the OpenUrlCommand is in the Page’s BindingContext but the Url value is in the list item of MyData. Fxpansion license manager download. You specify the source of the OpenUrlCommand to the instance of the page, then reference it by BindingContext.OpenUrlCommand.
Converters
Sometimes you need to convert a type to another type before binding to the property. You can do this with TypeConverters. The most common type is a NotConverter or an InverseConverter. Instead of adding more properties to your model you can just flip values in XAML. Sometimes a converter is used for more complex conversions.
Formatting
If you want to format a string just for the View, you shouldn’t go creating a new property or format it in the model, since this is only for display purposes. For this purpose we can use a formatter in the binding to display the value however you want.
Template Binding
Template Binding has only come about in 2.1.0+ with the introduction of Control Templates. This binding is just as simple as the regular binding, however you are binding to the BindingContext of the control it is applied to. You only need to reference BindingContext.PropertyName if the BindingContext of the control is an object with a BindingContext, otherwise you can reference the property directly.
Static Resource
Sometimes you want to reference a static resource rather than the BindingContext. StaticResources are defined in the ResourceDictionary and are available at compile time. Mosfet 60v 250a.
If you want to reference a static object and not a static resource you do as below. Remember a resource is defined in a ResourceDictionary a static object is just a static object in your code.
Dynamic Resource
Dynamic Resources are the same as static resources with one difference, they can be added / removed at runtime. If you resource is being loaded into the ResourceDictionary at runtime, then you will need to use the DynamicResource reference.
Margin vs Markup tables
The margin vs markup tables below act as a quick reference to help you calculate markup and cost multiplier values from a known margin. The tables are based on the margin vs markup formula as follows:
How to Calculate Markup
As an example of using the margin vs markup tables, suppose a business has a product which has a margin of 20%. using the table it can see that the corresponding markup is 25% and the cost multiplier is 1.25.
So if the selling price, say 90 is known, the profit would be calculated using the margin
Profit = 20% x 90 = 18
If the cost price of 72 is known, then the profit would be calculated using the markup
Profit = 25% x 72 = 18 as before.
The multiplier of 1.25 can be applied to the cost price to give a corresponding selling price. In this example the selling price would be 1.25 x 72 = 90
Our tutorial on markup vs margin gives full details about how to convert from markup to margin and the use of the cost multiplier.
Margin vs Markup Tables Guide and Key
- Margin % : Each row represents a margin % from 1 to 99.
- Markup % : Each row represents the markup %.
- Multiplier: Each row represents the cost multiplier.
| Margin % | Markup % | Multiplier |
|---|---|---|
| 1.0% | 1.0% | 1.01 |
| 2.0% | 2.0% | 1.02 |
| 3.0% | 3.1% | 1.03 |
| 4.0% | 4.2% | 1.04 |
| 5.0% | 5.3% | 1.05 |
| 6.0% | 6.4% | 1.06 |
| 7.0% | 7.5% | 1.08 |
| 8.0% | 8.7% | 1.09 |
| 9.0% | 9.9% | 1.10 |
| 10.0% | 11.1% | 1.11 |
| 11.0% | 12.4% | 1.12 |
| 12.0% | 13.6% | 1.14 |
| 13.0% | 14.9% | 1.15 |
| 14.0% | 16.3% | 1.16 |
| 15.0% | 17.6% | 1.18 |
| 16.0% | 19.0% | 1.19 |
| 17.0% | 20.5% | 1.20 |
| 18.0% | 22.0% | 1.22 |
| 19.0% | 23.5% | 1.23 |
| 20.0% | 25.0% | 1.25 |
| 21.0% | 26.6% | 1.27 |
| 22.0% | 28.2% | 1.28 |
| 23.0% | 29.9% | 1.30 |
| 24.0% | 31.6% | 1.32 |
| 25.0% | 33.3% | 1.33 |
| 26.0% | 35.1% | 1.35 |
| 27.0% | 37.0% | 1.37 |
| 28.0% | 38.9% | 1.39 |
| 29.0% | 40.8% | 1.41 |
| 30.0% | 42.9% | 1.43 |
| 31.0% | 44.9% | 1.45 |
| 32.0% | 47.1% | 1.47 |
| 33.0% | 49.3% | 1.49 |
| 34.0% | 51.5% | 1.52 |
| 35.0% | 53.8% | 1.54 |
| 36.0% | 56.3% | 1.56 |
| 37.0% | 58.7% | 1.59 |
| 38.0% | 61.3% | 1.61 |
| 39.0% | 63.9% | 1.64 |
| 40.0% | 66.7% | 1.67 |
| 41.0% | 69.5% | 1.69 |
| 42.0% | 72.4% | 1.72 |
| 43.0% | 75.4% | 1.75 |
| 44.0% | 78.6% | 1.79 |
| 45.0% | 81.8% | 1.82 |
| 46.0% | 85.2% | 1.85 |
| 47.0% | 88.7% | 1.89 |
| 48.0% | 92.3% | 1.92 |
| 49.0% | 96.1% | 1.96 |
| 50.0% | 100.0% | 2.00 |
| 51.0% | 104.1% | 2.04 |
| 52.0% | 108.3% | 2.08 |
| 53.0% | 112.8% | 2.13 |
| 54.0% | 117.4% | 2.17 |
| 55.0% | 122.2% | 2.22 |
| 56.0% | 127.3% | 2.27 |
| 57.0% | 132.6% | 2.33 |
| 58.0% | 138.1% | 2.38 |
| 59.0% | 143.9% | 2.44 |
| 60.0% | 150.0% | 2.50 |
| 61.0% | 156.4% | 2.56 |
| 62.0% | 163.2% | 2.63 |
| 63.0% | 170.3% | 2.70 |
| 64.0% | 177.8% | 2.78 |
| 65.0% | 185.7% | 2.86 |
| 66.0% | 194.1% | 2.94 |
| 67.0% | 203.0% | 3.03 |
| 68.0% | 212.5% | 3.13 |
| 69.0% | 222.6% | 3.23 |
| 70.0% | 233.3% | 3.33 |
| 71.0% | 244.8% | 3.45 |
| 72.0% | 257.1% | 3.57 |
| 73.0% | 270.4% | 3.70 |
| 74.0% | 284.6% | 3.85 |
| 75.0% | 300.0% | 4.00 |
| 76.0% | 316.7% | 4.17 |
| 77.0% | 334.8% | 4.35 |
| 78.0% | 354.5% | 4.55 |
| 79.0% | 376.2% | 4.76 |
| 80.0% | 400.0% | 5.00 |
| 81.0% | 426.3% | 5.26 |
| 82.0% | 455.6% | 5.56 |
| 83.0% | 488.2% | 5.88 |
| 84.0% | 525.0% | 6.25 |
| 85.0% | 566.7% | 6.67 |
| 86.0% | 614.3% | 7.14 |
| 87.0% | 669.2% | 7.69 |
| 88.0% | 733.3% | 8.33 |
| 89.0% | 809.1% | 9.09 |
| 90.0% | 900.0% | 10.00 |
| 91.0% | 1011.1% | 11.11 |
| 92.0% | 1150.0% | 12.50 |
| 93.0% | 1328.6% | 14.29 |
| 94.0% | 1566.7% | 16.67 |
| 95.0% | 1900.0% | 20.00 |
| 96.0% | 2400.0% | 25.00 |
| 97.0% | 3233.3% | 33.33 |
| 98.0% | 4900.0% | 50.00 |
| 99.0% | 9900.0% | 100.00 |
About the Author
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Chartered accountant Michael Brown is the founder and CEO of Double Entry Bookkeeping. He has worked as an accountant and consultant for more than 25 years and has built financial models for all types of industries. He has been the CFO or controller of both small and medium sized companies and has run small businesses of his own. He has been a manager and an auditor with Deloitte, a big 4 accountancy firm, and holds a degree from Loughborough University.