Friendly.FormsStandardControls

This library is a layer on top of Friendly, so you must learn that first. But it is very easy to learn.

https://github.com/Codeer-Software/Friendly

Getting Started

Install Friendly.FormsStandardControls from NuGet

Install-Package Ong.Friendly.FormsStandardControls

https://www.nuget.org/packages/Ong.Friendly.FormsStandardControls/

Friendly.FormsStandardControls defines the following classes.
They can operate WinForms control easily from a separate process.

FormsButton
FormsCheckBox
FormsCheckedListBox
FormsComboBox
FormsControlBase
FormsDataGridView
FormsDateTimePicker
FormsLinkLabel
FormsListBox
FormsListView
FormsMaskedTextBox
FormsMonthCalendar
FormsNumericUpDown
FormsProgressBar
FormsRadioButton
FormsRichTextBox
FormsTabControl
FormsTextBox
FormsToolStrip
FormsToolStripButton
FormsToolStripComboBox
FormsToolStripItem
FormsToolStripTextBox
FormsTrackBar
FormsTreeView

//sample  
var process = Process.GetProcessesByName("WPFTarget")[0];  
using (var app = new WindowsAppFriend(process))  
{  
    dynamic main = app.Type(typeof(Application)).OpenForms[0];  
    var grid = new FormsDataGridView(main._grid);  
    grid.EmulateChangeCellText(0, 0, "abc");  
    grid.EmulateChangeCellComboSelect(1, 0, 2);  
    grid.EmulateCellCheck(2, 0, true);  
}

More samples.

https://github.com/ShinichiIshizuka/Ong.Friendly.FormsStandardControls/tree/master/Project/Test/FormsTest

The control driver is implemented using processing that uses the basic functions of Friendly.
If you are using non-standard controls such as 3rd party controls you will need to create a new one.
Knowledge of Friendly and its controls should not be so difficult.
When you make ControlDriver, it is better not to refer to the implementation of FormsStandard Controls.
It is difficult to read because there are many special writing methods that include support for .Net 4.0 and earlier.
Normally, it is not necessary to support .Net 4.0 or earlier, so it is better to write it differently.
Please refer to this as it is relatively easy to read.
It is 3rd party control driver.
https://github.com/Codeer-Software/Friendly.XamControls

For other GUI types, use the following libraries: