How do i add a custom visual element into a windows forms app project? (C#)

Question

I want to add an element to my windows forms app with .NET 6.0. When i try following some tutorial, it doesnt work at all. Please help me.

I want to add FastColoredTextBox into my project, specifically.

Answer 1

You can just copy the sources from FastColoredTextBox
(except FastColoredTextBox.csproj and FastColoredTextBox.resx)
and it works with .NET 6

A quick test =>

        FastColoredTextBox fctb = null;  
        private void Form1_Load(object sender, EventArgs e)  
        {  
            fctb = new FastColoredTextBox();  
            fctb.Location = new System.Drawing.Point(10, 10);  
            fctb.Size = new System.Drawing.Size(300, 300);  
            fctb.BorderStyle = BorderStyle.FixedSingle;  
            fctb.Language = Language.CSharp;  
            fctb.WordWrap = true;  
            fctb.WordWrapMode = WordWrapMode.CharWrapControlWidth;  
            fctb.Text = @"public Form1()  
{  
      // Test comment  
      InitializeComponent();  
}  
            ";  
            Controls.Add(fctb);  
        }  

Answer 2

FastColoredTextBox is not compatible with any version of .NET Core which mean you can't use it in your project. I looked at the code, to make it work in your project would take hours of work which entails creating a new project, new forms and controls. Classes might port without changes.