How to show error message in red color and some specific msg in blue color on richtextbox and save it in an rtf file?

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I am using richtextbox.appendtext to show a message in RichTextBox. Like when I click on some button, a "click on button" message will show in a rich text box.

I used the selection.color method, but the problem is that when I go to save this file in RTF format the blue color is gone while saving, and I want to save the file with the colour text that show in the rich text box.

What I have tried:

C#

private void frmMainPage_FormClosing(object sender, FormClosingEventArgs e)
           {
           if (firstStart == 0)
           {
               firstStart = 1;

               var confirmResult = MessageBox.Show("Do you want to quit the application?",
                                    "Quit?",
                                    MessageBoxButtons.YesNo);
              if (confirmResult == DialogResult.Yes )
               {

                   Log.Write(richTextBox1.Text += "Application Ended: " + "[" + sCounter() + "] " + DateTime.Now);

                   //if (t != null)
                   //{
                   //    t.Abort();
                   //}
                   // Close transaction connection
                   //TextRange range;
                   //FileStream stream;
                   //stream = new FileStream("myrichtextbox.txt", FileMode.Create);
                   // richTextBox1.SaveFile("C:\\MyDocument.rtf", RichTextBoxStreamType.RichText);

                   SaveFileDialog saveFile1 = new SaveFileDialog();

                   // Initialize the SaveFileDialog to specify the RTF extention for the file.
                   saveFile1.DefaultExt = "*.rtf";
                   saveFile1.Filter = "RTF Files|*.rtf";
                   if (richTextBox1.Text == String.Empty)
                   {
                       Application.ExitThread();
                   }

                   // Determine whether the user selected a file name from the saveFileDialog.

                   else if (saveFile1.ShowDialog() == System.Windows.Forms.DialogResult.OK &&
                      saveFile1.FileName.Length > 0  )
                   {
                       // Save the contents of the RichTextBox into the file.
                       if (button1WasClicked == false)
                       {

                           richTextBox1.SaveFile(saveFile1.FileName, RichTextBoxStreamType.RichText);

                       }

                   }

                       Application.ExitThread();

               }

               else
               {
                   e.Cancel = true;
               }
           }

       }

This is my closing and saving code.

Posted 23-Jan-22 22:51pm

Suraj Ingle

Updated 24-Jan-22 6:11am

Sean Ewington

v2

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OriginalGriff · Answer 1 · 2022-01-23T23:08:00

It works for me:

C#

private void FrmMain_Shown(object sender, EventArgs epp)
    {
    MyRichTextBox.Text = "Default:InRed:InBlue";
    MyRichTextBox.SelectionStart = MyRichTextBox.Text.IndexOf(":") + 1;
    MyRichTextBox.SelectionLength = 5;
    MyRichTextBox.SelectionColor = Color.Red;
    MyRichTextBox.SelectionStart = MyRichTextBox.Text.LastIndexOf(":") + 1;
    MyRichTextBox.SelectionLength = 6;
    MyRichTextBox.SelectionColor = Color.Blue;
    }

private void MyButton_Click(object sender, EventArgs e)
    {
    string path = @"D:\Temp\AAARTF.rtf";
    MyRichTextBox.SaveFile(path, RichTextBoxStreamType.RichText);
    }

private void MyOtherButton_Click(object sender, EventArgs e)
    {
    string path = @"D:\Temp\AAARTF.rtf";
    MyRichTextBox.LoadFile(path);
    }

The file content is RTF, and it loads fine:

Rich Text Format

{\rtf1\ansi\deff0\nouicompat{\fonttbl{\f0\fnil\fcharset0 Microsoft Sans Serif;}}
{\colortbl ;\red255\green0\blue0;\red0\green0\blue255;}
{\*\generator Riched20 10.0.22000}\viewkind4\uc1 
\pard\f0\fs17\lang2057 Default:\cf1 InRed\cf0 :\cf2 InBlue\cf0\par
}

So what am I doing that you aren't, or you doing that I am not?