How to stretch in width a WPF user control to its window

Question

I have a Window with my user control and I would like to make usercontrol width equals window width  How to do that   The user control is a horizontal menu and contains a grid with three columns    lt ColumnDefinition Name  LeftSideMenu  Width  433   gt   lt ColumnDefinition Name  Middle  Width      gt   lt ColumnDefinition Name  RightSideMenu  Width  90   gt    That is the reason I want the window width  to stretch the user control to 100  width  with the second column relative   EDIT   I am using a grid  there is the code for Window    lt Window x Class  TCI Indexer UI Operacao      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      xmlns tci  clr-namespace TCI Indexer UI Controles      Title     MinHeight  550  MinWidth  675  Loaded  Load  ResizeMode  NoResize  WindowStyle  None  WindowStartupLocation  CenterScreen  WindowState  Maximized  Focusable  True      x Name  windowOperacao  gt       lt Canvas x Name  canv  gt           lt Grid gt               lt tci Status x Name  ucStatus   gt   lt  -- the control which I want to stretch in width -- gt           lt  Grid gt       lt  Canvas gt   lt  Window gt

User · Answer

Does setting the HorizontalAlignment to Stretch  and the Width to Auto on the user control achieve the desired results

User · Answer

You need to make sure your usercontrol hasn t set it s width in the usercontrol s xaml file  Just delete the Width       from it and you re good to go   EDIT  This is the code I tested it with   SOUserAnswerTest xaml    lt UserControl x Class  WpfApplication1 SOAnswerTest      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Height  300  gt       lt Grid gt           lt Grid ColumnDefinitions gt               lt ColumnDefinition Name  LeftSideMenu  Width  100   gt               lt ColumnDefinition Name  Middle  Width      gt               lt ColumnDefinition Name  RightSideMenu  Width  90   gt           lt  Grid ColumnDefinitions gt           lt TextBlock Grid Column  0  gt a lt  TextBlock gt           lt TextBlock Grid Column  1  gt b lt  TextBlock gt           lt TextBlock Grid Column  2  gt c lt  TextBlock gt       lt  Grid gt   lt  UserControl gt    Window1 xaml    lt Window x Class  WpfApplication1 Window1      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      xmlns local  clr-namespace WpfApplication1      Title  Window1  Height  300  Width  415  gt       lt Grid gt            lt local SOAnswerTest Grid Column  0  Grid Row  5  Grid ColumnSpan  2   gt       lt  Grid gt   lt  Window gt

User · Answer

This worked for me  don t assign any width or height to the UserControl and define row and column definition in the parent window    lt UserControl x Class  MySampleApp myUC           xmlns  http   schemas microsoft com winfx 2006 xaml presentation           xmlns x  http   schemas microsoft com winfx 2006 xaml           xmlns mc  http   schemas openxmlformats org markup-compatibility 2006            xmlns d  http   schemas microsoft com expression blend 2008            mc Ignorable  d             gt      lt Grid gt        lt  Grid gt   lt  UserControl gt      lt Window xmlns MySampleApp  clr-namespace MySampleApp   x Class  MySampleApp MainWindow      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Title  MainWindow  Height  auto  Width  auto  MinWidth  1000   gt   lt Grid gt       lt Grid RowDefinitions gt           lt RowDefinition Height  Auto    gt                  lt  Grid RowDefinitions gt       lt Grid ColumnDefinitions gt           lt ColumnDefinition Width       gt                   lt  Grid ColumnDefinitions gt       lt MySampleApp myUC Grid Column  0  Grid Row  0    gt          lt  Grid gt

User · Answer

Is the Canvas crucial in your window  If not  try removing it and keep the Grid as the main panel  Canvas has no size unless specified  while a Grid normally takes up all available space  Inside the Canvas  the Grid will have no available space

User · Answer

Instead use Width and Height in user controls  use MinHeight and MinWidth  Then you can configure the UC well  and will be able to stretch inside other window   Well  as Im seeing in WPF Microsoft made a re-thinking about windows properties and behaviors  but so far  I didn t miss anything from olds windows forms  in WPF the controls are there  but in a new point of view

User · Answer

Is the Canvas crucial in your window  If not  try removing it and keep the Grid as the main panel  Canvas has no size unless specified  while a Grid normally takes up all available space  Inside the Canvas  the Grid will have no available space

User · Answer

What container are you adding the UserControl to  Generally when you add controls to a Grid  they will stretch to fill the available space  unless their row column is constrained to a certain width

User · Answer

Does setting the HorizontalAlignment to Stretch  and the Width to Auto on the user control achieve the desired results

User · Answer

What container are you adding the UserControl to  Generally when you add controls to a Grid  they will stretch to fill the available space  unless their row column is constrained to a certain width

User · Answer

The Canvas in WPF doesn t provide much automatic layout support  I try to steer clear of them for this reason  HorizontalAlignment and VerticalAlignment don t work as expected   but I got your code to work with these minor modifications  binding the Width and Height of the control to the canvas s ActualWidth ActualHeight     lt Window x Class  TCI Indexer UI Operacao  xmlns  http   schemas microsoft com winfx 2006 xaml presentation  xmlns x  http   schemas microsoft com winfx 2006 xaml  xmlns tci  clr-namespace TCI Indexer UI Controles  Title     MinHeight  550  MinWidth  675  Loaded  Load   ResizeMode  NoResize  WindowStyle  None  WindowStartupLocation  CenterScreen   WindowState  Maximized  Focusable  True  x Name  windowOperacao  gt    lt Canvas x Name  canv  gt       lt Grid gt           lt tci Status x Name  ucStatus  Width   Binding ElementName canv                                                       Path ActualWidth                                          Height   Binding ElementName canv                                                       Path ActualHeight    gt            lt  -- the control which I want to stretch in width -- gt       lt  Grid gt   lt  Canvas gt    The Canvas is the problem here  If you re not actually utilizing the features the canvas offers in terms of layout or Z-Order  squashing   think of the flatten command in PhotoShop   I would consider using a control like a Grid instead so you don t end up having to learn the quirks of a control that works differently than you have come to expect with WPF

User · Answer

You need to make sure your usercontrol hasn t set it s width in the usercontrol s xaml file  Just delete the Width       from it and you re good to go   EDIT  This is the code I tested it with   SOUserAnswerTest xaml    lt UserControl x Class  WpfApplication1 SOAnswerTest      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Height  300  gt       lt Grid gt           lt Grid ColumnDefinitions gt               lt ColumnDefinition Name  LeftSideMenu  Width  100   gt               lt ColumnDefinition Name  Middle  Width      gt               lt ColumnDefinition Name  RightSideMenu  Width  90   gt           lt  Grid ColumnDefinitions gt           lt TextBlock Grid Column  0  gt a lt  TextBlock gt           lt TextBlock Grid Column  1  gt b lt  TextBlock gt           lt TextBlock Grid Column  2  gt c lt  TextBlock gt       lt  Grid gt   lt  UserControl gt    Window1 xaml    lt Window x Class  WpfApplication1 Window1      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      xmlns local  clr-namespace WpfApplication1      Title  Window1  Height  300  Width  415  gt       lt Grid gt            lt local SOAnswerTest Grid Column  0  Grid Row  5  Grid ColumnSpan  2   gt       lt  Grid gt   lt  Window gt

User · Answer

The Canvas in WPF doesn t provide much automatic layout support  I try to steer clear of them for this reason  HorizontalAlignment and VerticalAlignment don t work as expected   but I got your code to work with these minor modifications  binding the Width and Height of the control to the canvas s ActualWidth ActualHeight     lt Window x Class  TCI Indexer UI Operacao  xmlns  http   schemas microsoft com winfx 2006 xaml presentation  xmlns x  http   schemas microsoft com winfx 2006 xaml  xmlns tci  clr-namespace TCI Indexer UI Controles  Title     MinHeight  550  MinWidth  675  Loaded  Load   ResizeMode  NoResize  WindowStyle  None  WindowStartupLocation  CenterScreen   WindowState  Maximized  Focusable  True  x Name  windowOperacao  gt    lt Canvas x Name  canv  gt       lt Grid gt           lt tci Status x Name  ucStatus  Width   Binding ElementName canv                                                       Path ActualWidth                                          Height   Binding ElementName canv                                                       Path ActualHeight    gt            lt  -- the control which I want to stretch in width -- gt       lt  Grid gt   lt  Canvas gt    The Canvas is the problem here  If you re not actually utilizing the features the canvas offers in terms of layout or Z-Order  squashing   think of the flatten command in PhotoShop   I would consider using a control like a Grid instead so you don t end up having to learn the quirks of a control that works differently than you have come to expect with WPF

User · Answer

Does setting the HorizontalAlignment to Stretch  and the Width to Auto on the user control achieve the desired results

User · Answer

You need to make sure your usercontrol hasn t set it s width in the usercontrol s xaml file  Just delete the Width       from it and you re good to go   EDIT  This is the code I tested it with   SOUserAnswerTest xaml    lt UserControl x Class  WpfApplication1 SOAnswerTest      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Height  300  gt       lt Grid gt           lt Grid ColumnDefinitions gt               lt ColumnDefinition Name  LeftSideMenu  Width  100   gt               lt ColumnDefinition Name  Middle  Width      gt               lt ColumnDefinition Name  RightSideMenu  Width  90   gt           lt  Grid ColumnDefinitions gt           lt TextBlock Grid Column  0  gt a lt  TextBlock gt           lt TextBlock Grid Column  1  gt b lt  TextBlock gt           lt TextBlock Grid Column  2  gt c lt  TextBlock gt       lt  Grid gt   lt  UserControl gt    Window1 xaml    lt Window x Class  WpfApplication1 Window1      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      xmlns local  clr-namespace WpfApplication1      Title  Window1  Height  300  Width  415  gt       lt Grid gt            lt local SOAnswerTest Grid Column  0  Grid Row  5  Grid ColumnSpan  2   gt       lt  Grid gt   lt  Window gt

User · Answer

The Canvas in WPF doesn t provide much automatic layout support  I try to steer clear of them for this reason  HorizontalAlignment and VerticalAlignment don t work as expected   but I got your code to work with these minor modifications  binding the Width and Height of the control to the canvas s ActualWidth ActualHeight     lt Window x Class  TCI Indexer UI Operacao  xmlns  http   schemas microsoft com winfx 2006 xaml presentation  xmlns x  http   schemas microsoft com winfx 2006 xaml  xmlns tci  clr-namespace TCI Indexer UI Controles  Title     MinHeight  550  MinWidth  675  Loaded  Load   ResizeMode  NoResize  WindowStyle  None  WindowStartupLocation  CenterScreen   WindowState  Maximized  Focusable  True  x Name  windowOperacao  gt    lt Canvas x Name  canv  gt       lt Grid gt           lt tci Status x Name  ucStatus  Width   Binding ElementName canv                                                       Path ActualWidth                                          Height   Binding ElementName canv                                                       Path ActualHeight    gt            lt  -- the control which I want to stretch in width -- gt       lt  Grid gt   lt  Canvas gt    The Canvas is the problem here  If you re not actually utilizing the features the canvas offers in terms of layout or Z-Order  squashing   think of the flatten command in PhotoShop   I would consider using a control like a Grid instead so you don t end up having to learn the quirks of a control that works differently than you have come to expect with WPF

User · Answer

Is the Canvas crucial in your window  If not  try removing it and keep the Grid as the main panel  Canvas has no size unless specified  while a Grid normally takes up all available space  Inside the Canvas  the Grid will have no available space

User · Answer

Instead use Width and Height in user controls  use MinHeight and MinWidth  Then you can configure the UC well  and will be able to stretch inside other window   Well  as Im seeing in WPF Microsoft made a re-thinking about windows properties and behaviors  but so far  I didn t miss anything from olds windows forms  in WPF the controls are there  but in a new point of view

User · Answer

You need to make sure your usercontrol hasn t set it s width in the usercontrol s xaml file  Just delete the Width       from it and you re good to go   EDIT  This is the code I tested it with   SOUserAnswerTest xaml    lt UserControl x Class  WpfApplication1 SOAnswerTest      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Height  300  gt       lt Grid gt           lt Grid ColumnDefinitions gt               lt ColumnDefinition Name  LeftSideMenu  Width  100   gt               lt ColumnDefinition Name  Middle  Width      gt               lt ColumnDefinition Name  RightSideMenu  Width  90   gt           lt  Grid ColumnDefinitions gt           lt TextBlock Grid Column  0  gt a lt  TextBlock gt           lt TextBlock Grid Column  1  gt b lt  TextBlock gt           lt TextBlock Grid Column  2  gt c lt  TextBlock gt       lt  Grid gt   lt  UserControl gt    Window1 xaml    lt Window x Class  WpfApplication1 Window1      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      xmlns local  clr-namespace WpfApplication1      Title  Window1  Height  300  Width  415  gt       lt Grid gt            lt local SOAnswerTest Grid Column  0  Grid Row  5  Grid ColumnSpan  2   gt       lt  Grid gt   lt  Window gt

User · Answer

This worked for me  don t assign any width or height to the UserControl and define row and column definition in the parent window    lt UserControl x Class  MySampleApp myUC           xmlns  http   schemas microsoft com winfx 2006 xaml presentation           xmlns x  http   schemas microsoft com winfx 2006 xaml           xmlns mc  http   schemas openxmlformats org markup-compatibility 2006            xmlns d  http   schemas microsoft com expression blend 2008            mc Ignorable  d             gt      lt Grid gt        lt  Grid gt   lt  UserControl gt      lt Window xmlns MySampleApp  clr-namespace MySampleApp   x Class  MySampleApp MainWindow      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Title  MainWindow  Height  auto  Width  auto  MinWidth  1000   gt   lt Grid gt       lt Grid RowDefinitions gt           lt RowDefinition Height  Auto    gt                  lt  Grid RowDefinitions gt       lt Grid ColumnDefinitions gt           lt ColumnDefinition Width       gt                   lt  Grid ColumnDefinitions gt       lt MySampleApp myUC Grid Column  0  Grid Row  0    gt          lt  Grid gt

User · Answer

Is the Canvas crucial in your window  If not  try removing it and keep the Grid as the main panel  Canvas has no size unless specified  while a Grid normally takes up all available space  Inside the Canvas  the Grid will have no available space

User · Answer

Does setting the HorizontalAlignment to Stretch  and the Width to Auto on the user control achieve the desired results

User · Answer

What container are you adding the UserControl to  Generally when you add controls to a Grid  they will stretch to fill the available space  unless their row column is constrained to a certain width

User · Answer

The Canvas in WPF doesn t provide much automatic layout support  I try to steer clear of them for this reason  HorizontalAlignment and VerticalAlignment don t work as expected   but I got your code to work with these minor modifications  binding the Width and Height of the control to the canvas s ActualWidth ActualHeight     lt Window x Class  TCI Indexer UI Operacao  xmlns  http   schemas microsoft com winfx 2006 xaml presentation  xmlns x  http   schemas microsoft com winfx 2006 xaml  xmlns tci  clr-namespace TCI Indexer UI Controles  Title     MinHeight  550  MinWidth  675  Loaded  Load   ResizeMode  NoResize  WindowStyle  None  WindowStartupLocation  CenterScreen   WindowState  Maximized  Focusable  True  x Name  windowOperacao  gt    lt Canvas x Name  canv  gt       lt Grid gt           lt tci Status x Name  ucStatus  Width   Binding ElementName canv                                                       Path ActualWidth                                          Height   Binding ElementName canv                                                       Path ActualHeight    gt            lt  -- the control which I want to stretch in width -- gt       lt  Grid gt   lt  Canvas gt    The Canvas is the problem here  If you re not actually utilizing the features the canvas offers in terms of layout or Z-Order  squashing   think of the flatten command in PhotoShop   I would consider using a control like a Grid instead so you don t end up having to learn the quirks of a control that works differently than you have come to expect with WPF

User · Answer

What container are you adding the UserControl to  Generally when you add controls to a Grid  they will stretch to fill the available space  unless their row column is constrained to a certain width

[c#] How to stretch in width a WPF user control to its window?

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