The GridLength struct specifies a row height or a column width in terms of the GridUnitType enumeration, which has three members: The RowDefinition class defines a Height property, of type GridLength, and the ColumnDefinition class defines a Width property, of type GridLength. These collections define the row and column characteristics of a Grid, and should contain one RowDefinition object for each row in the Grid, and one ColumnDefinition object for each column in the Grid. The layout behavior of a Grid can be defined with the RowDefinitions and ColumnDefinitions properties, which are collections of RowDefinition and ColumnDefinition objects, respectively. In this example, the Grid contains a single child Label that's automatically positioned in a single location: Rows and columnsīy default, a Grid contains one row and one column: These properties are backed by BindableProperty objects, which means that the properties can be targets of data bindings and styled. A validation callback ensures that when the property is set, its value is greater than or equal to 1.
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