RichTextBox Selection Highlight

Question

Is there a possibility that after selection made by user, every selected letter displays it\'s original color? And not always white as it\'s by default?

I want to ac

Answer 1

For anyone having problem with Visual Studio 2019 and exception "Class already exists" as mentioned in Hunar's comment I modified slightly code to load library only once and that solved issue for me.

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Windows.Forms;

[DesignerCategory("Code")]
public class RichTextBox5 : RichTextBox
{
    [DllImport("kernel32.dll", EntryPoint = "LoadLibraryW", CharSet = CharSet.Unicode, SetLastError = true)]
    private static extern IntPtr LoadLibraryW(string s_File);

    private static readonly object libraryLoadLock = new object();
    private static bool libraryLoadFlag;

    public static IntPtr LoadLibrary(string s_File)
    {
        var module = LoadLibraryW(s_File);
        if (module != IntPtr.Zero)
        {
            return module;
        }
        var error = Marshal.GetLastWin32Error();
        throw new Win32Exception(error);
    }

    protected override CreateParams CreateParams
    {
        get
        {
            var cp = base.CreateParams;
            try
            {
                lock (libraryLoadLock)
                {
                    if (!libraryLoadFlag)
                    {
                        LoadLibrary("MsftEdit.dll"); // Available since XP SP1
                        libraryLoadFlag = true;
                    }
                }
                cp.ClassName = "RichEdit50W";
            }
            catch { /* Windows XP without any Service Pack.*/ }
            return cp;
        }
    }
}

Sorry for answering this way, but due to insufficient reputation points I was able only to post an answer.