WPF Auto height in code

How could I set the value of the Height property of a WPF control in C# code to "Auto"?

<Grid.RowDefinitions>
    <RowDefinition />
    <RowDefinition Height="Auto" />
    <RowDefinition />
    <RowDefinition Height="Auto" />
    <RowDefinition />
    <RowDefinition Height="Auto" />
    <RowDefinition />
    <RowDefinition Height="Auto" />
    <RowDefinition />
</Grid.RowDefinitions>

I want to reproduce this behavior in the code behind. Any ideas?

Perhaps this link will help you.

At times, you may want to programmatically set the Height or Width of a WPF element to Auto in code. To do this, just use the Double.NaN (Not a Number) value.

For example, in C#:

this.txtName.Width = Double.NaN;

You can use

RowDefinition rd = new RowDefinition();  
rd.Height = GridLength.Auto;  
ContentGrid.RowDefinitions.Add(rd);

While the question has been answered with the code-behind (as asked), here is the same solution in XAML for basic control properties who don't have "auto":

xmlns:sys="clr-namespace:System;assembly=mscorlib"

Height="{x:Static sys:Double.NaN}"

Posting because google took me here when searching for XAML solution for a TextBox (auto doesn't exist).

WPF Auto height in code

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