How to avoid having a Window smaller than the minimum size of a UserControl in WPF?

Include MinHeight="MinSize" MinWidth="MinSize" inside the <Window> section

MinSize = Desired Integer Value ex 400/350 etc.

<Window x:Class="IOTA_WPF.MainWindow"    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    Title="MainWindow"     WindowState="Maximized"    MinHeight="400" MinWidth="650">

I know this is several years after the fact, but I recently ran across this question as I was dealing with a similar problem I had. This is how I solved it. The solution is specific to my problem, but can be altered to get a variety of desired resizing behaviors.

First set the window so that it initially sizes itself to fit its contents.

<Window ...    SizeToContent="WidthAndHeight" >

Next I set each embedded control so that it reports a desired width and height. Most built in controls do this for you. You can do it for custom controls by overriding MeasureOverride or you can just set a width and height for the control. Make this the minimum size you want the control to get.

<MyControl Name="_MyControlName" Width="640" Height="480" />

Don't worry about these 'hard' coded values effecting the behavior of the control. We deal with that next. Now when the window is displayed it will automatically adjust itself to fit your controls.

Next subscribe to the window loaded event.

<Window ...    SizeToContent="WidthAndHeight" Loaded="Window_Loaded" >

In the window loaded event you can adjust the sizing behavior of your window and the controls in it. You can make it so your controls can resize. You can set a minimum size for the window to the size you just had layed out. The advantage here is that you just allowed the layout system to find a good layout for you. You want to leverage its work.

    private void Window_Loaded(object sender, RoutedEventArgs e)    {        // We know longer need to size to the contents.        ClearValue(SizeToContentProperty);        // We want our control to shrink/expand with the window.        _MyControlName.ClearValue(WidthProperty);        _MyControlName.ClearValue(HeightProperty);        // Don't want our window to be able to get any smaller than this.        SetValue(MinWidthProperty, this.Width);        SetValue(MinHeightProperty, this.Height);    }

What you place in the Window_Loaded method will depend on the behavior you are trying to accomplish.

Hope this can help some others save time.

You can set the controls MinHeight property to prevent it getting smaller that desired.