How to add comments into a Xaml file in WPF

Question

I used this syntax as I found online but it throws an error   xmlns x  http   schemas microsoft com winfx 2006 xaml   lt  -- Cool comment -- gt  xmlns System  clr-namespace System assembly mscorlib        Name cannot begin with the   lt   character  hexadecimal value 0x3C    Line 4  position 5   XML is not valid

User · Answer

You cannot put comments inside UWP XAML tags. Your syntax is right.

TO DO:

<xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:System="clr-namespace:System;assembly=mscorlib"/>
<!-- Cool comment -->

NOT TO DO:

<xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    <!-- Cool comment -->
xmlns:System="clr-namespace:System;assembly=mscorlib"/>

User · Answer

Just a tip    In Visual Studio to comment a text  you can highlight the text you want to comment  and then use Ctrl   K followed by Ctrl   C  To uncomment  you can use Ctrl   K followed by Ctrl   U

User · Answer

For anyone learning this stuff  comments are more important  so drawing on Xak Tacit s idea   from User500099 s link  for Single Property comments  add this to the top of the XAML code block    lt  --Comments Allowed With Markup Compatibility  mc  In XAML      xmlns mc  http   schemas openxmlformats org markup-compatibility 2006      xmlns   ignore    http   www galasoft ch ignore      mc Ignorable    ignore        Usage in property    ignore   AttributeToIgnore  Text Of AttributeToIgnore -- gt    Then in the code block   lt Application FooApp Class  Foo App  xmlns mc  http   schemas openxmlformats org markup-compatibility 2006  xmlns   ignore    http   www galasoft ch ignore  mc Ignorable    ignore         AttributeNotToIgnore  TextNotToIgnore             ignore   IgnoreThisAttribute  IgnoreThatText          gt   lt  Application gt

User · Answer

Found a nice solution by Laurent Bugnion  it can look something like this    lt UserControl xmlns mc  http   schemas openxmlformats org markup-compatibility 2006                xmlns d  http   schemas microsoft com expression blend 2008                xmlns comment  Tag to add comments               mc Ignorable  d comment  d DesignHeight  300  d DesignWidth  300  gt       lt Grid gt           lt Button Width  100                  comment Width  example comment on Width  will be ignored        gt           lt  Button gt       lt  Grid gt   lt  UserControl gt    Here s the link  http   blog galasoft ch posts 2010 02 quick-tip-commenting-out-properties-in-xaml   A commenter on the link provided extra characters for the ignore prefix in lieu of highlighting   mc Ignorable      ignore

User · Answer

I assume those XAML namespace declarations are in the parent tag of your control  You can t put comments inside of another tag  Other than that  the syntax you re using is correct    lt UserControl xmlns       gt       lt  -- Here s a valid comment  Notice it s outside the  lt UserControl gt  tag s braces -- gt         snip     lt  UserControl gt

User · Answer

You can t insert comments inside xml tags  Bad  lt Window xmlns x  quot http   schemas microsoft com winfx 2006 xaml quot   lt  -- Cool comment -- gt  xmlns System  quot clr-namespace System assembly mscorlib quot  gt   Good  lt Window xmlns x  quot http   schemas microsoft com winfx 2006 xaml quot  xmlns System  quot clr-namespace System assembly mscorlib quot  gt   lt  -- Cool comment -- gt

[c#] How to add comments into a Xaml file in WPF?

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