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Asked: 2026-05-20T22:08:57+00:00

In html one can say width=20%. This is not allowed in XAML of course.

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In html one can say width=”20%”. This is not allowed in XAML of course. Does anyone know why that is or is there a way to get percentage value support in XAML?

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  1. Editorial Team

    Grid ColumnDefinitions and RowDefinitions allow for proportional units (in addition to fixed pixels and Auto).

    Here are 2 examples:

    <Grid.ColumnDefinitions>
  <ColumnDefinition Width="Auto" />
  <ColumnDefinition Width="20" />
  <ColumnDefinition Width="*" />
  <ColumnDefinition Width="*"/>
  <ColumnDefinition Width="*"/>
  <ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>

    The first column will be as large as necessary to fit all content in the column. The next column is 20 device-independant pixels wide. The remaining Width of the grid will be divided equally among the remaining columns. (100% / 4 = 25% in each)

    <Grid.ColumnDefinitions>
  <ColumnDefinition Width="*" />
  <ColumnDefinition Width="4*"/>
  <ColumnDefinition Width="4*"/>
  <ColumnDefinition Width="*"/> 
</Grid.ColumnDefinitions>

    This code would divide 4 columns into 10%, 40%, 40%, and 10% of the total Grid Width.

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