[Winform, C#] RichTextBox automatically changes 'selectionFont and Selectioncolor' when I click richTextbox

Question

[Winform, C#] RichTextBox automatically changes 'selectionFont and Selectioncolor' when I click richTextbox

Banlim 0

Hello.

I'm using WinForm's RichTextBox, and I found a bug.

Type text in A font, then type text in B font, and click RichTextBox a few times to automatically change the font.
For example, first you enter a '맑은고딕' font, 'Hello' in green, then a '굴림' font, and 'World' in blue.
If you click RichTextBox in this state, the '굴림' font should remain blue, but the font and color change.
I attached a reproduced video, and I hope you check it out.

Thanks.

richTextboxBug

Anonymous

2023-06-13T05:34:57.6766667+00:00

Hi @Banlim , Welcome to Microsoft Q&A. You seem to be using a custom control? Is this function of modifying fonts brought by the input method? RichTextBox it doesn't seem like word either. Can you show your source code?
Banlim 0 Reputation points

2023-06-13T06:56:28.41+00:00
I wrote the font change method in the code below.

private void FontName_SelectedIndexChanged(object sender, EventArgs e) { string FontName = this.FontName.Text; Font font = this.rtb.SelectionFont; this.rtb.SelectionFont = new Font(fontName, font == null ? 10 : font.Size, font == null ? FontStyle.Regular : font.Style); this.rtb.Focus(); }

In addition, if I type in Korean while using the "Tahoma" font, there is a problem that all text is entered as "가가가가" so only some fonts are limited to users to select.

I want you to check this bug as well. I also attached the gif file below.
Anonymous

2023-06-13T09:09:14.8133333+00:00

I don't have a Korean environment. I have not reproduced your error in English environment. I use this.richTextBox1.SelectionColor = Color.Blue; to modify the color.

Banlim 0

Ok. The second bug I wrote will replace it with not using the font. But the first bug needs to be solved.

I've been testing it, but it seems to happen especially in the situation below.

Put any rtf string value in RichTextBox (this.rtb.Rtf = rtf;)
Input this and that text
Change font or color and enter text
Click RichTextbox several times and enter text.

string rtf = @"{\rtf1\deff0 \stshfdbch3\stshfloch2\stshfhich2\stshfbi1{\fonttbl{\f0 Calibri;}{\fbiminor\f1 Times New Roman;}{\fhiminor\f2 Calibri;}{\fdbminor\f3 Times New Roman;}{\f4\fcharset129 \'b8\'bc\'c0\'ba\'20\'b0\'ed\'b5\'f1;}}{\colortbl ;\red0\green0\blue255 ;}{\*\defchp \fcs1\f1\fcs1\f1\hich\af2\loch\af2\dbch\af3\cgrid1\fs24}{\*\defpap \widctlpar}{\stylesheet {\ql\fcs1\af1\ltrch\fcs0\hich\af2\dbch\af3\loch\f2\fs24 Normal;}{\*\cs1\fcs1\af1\ltrch\fcs0\hich\af2\dbch\af3\loch\f2\fs24 Default Paragraph Font;}{\*\cs2\sbasedon1\fcs1\af1\ltrch\fcs0\hich\af2\dbch\af3\loch\f2\fs24 Line Number;}{\*\cs3\fcs1\af1\ltrch\fcs0\hich\af2\dbch\af3\loch\f2\fs24\ul\cf1 Hyperlink;}{\*\ts4\tsrowd\fcs1\af1\ltrch\fcs0\hich\af2\dbch\af3\loch\f2\fs24\ql\tscellpaddfl3\tscellpaddl108\tscellpaddfb3\tscellpaddfr3\tscellpaddr108\tscellpaddft3\tsvertalt\cltxlrtb Normal Table;}{\*\ts5\tsrowd\sbasedon4\fcs1\af1\ltrch\fcs0\hich\af2\dbch\af3\loch\f2\fs24\ql\trbrdrt\brdrs\brdrw10\trbrdrl\brdrs\brdrw10\trbrdrb\brdrs\brdrw10\trbrdrr\brdrs\brdrw10\trbrdrh\brdrs\brdrw10\trbrdrv\brdrs\brdrw10\tscellpaddfl3\tscellpaddl108\tscellpaddfr3\tscellpaddr108\tsvertalt\cltxlrtb Table Simple 1;}}{\*\listoverridetable}{\info{\creatim\yr2023\mo6\dy13\hr18\min57}{\version1}}\nouicompat\htmautsp\sectd\pard\plain\ql\fcs1\af4\ltrch\fcs0\hich\af4\dbch\af4\loch\f4\fs18\lang1042\langnp1042\par\pard\plain\ql{\fcs1\af4\ltrch\fcs0\hich\af4\dbch\af4\loch\f4\fs18\lang1042\langnp1042\cf0 1234}\fcs1\af4\ltrch\fcs0\hich\af4\dbch\af4\loch\f4\fs18\lang1042\langnp1042\par{\*\themedata 
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this.rtb.Rtf = rtf;

Banlim 0 Reputation points

2023-06-13T10:02:10.1666667+00:00

Thanks
Anonymous

2023-06-14T08:58:42.9933333+00:00

I don't seem to see your color modifying code? And the font modification logic of this.rtb.SelectionFont and this.rtb.Font is different. Do you need different fonts in one rtb? If you use SelectionFont after selecting the text, you can achieve the font and color of the input again without changing. Regarding color modification, there are also differences between SelectionColor and forecolor. And your rtf is only displayed as "1234" to me.

Banlim 0

It is a bug that reproduces not only the color but also the font.
I'll explain the process of reproducing it again. If you follow it like this, the bug will be reproduced.

Put any rtf string. (For convenience, if you press the TEST button, put it in RichTextBox.)
Change font or color and type text.
Click RichTextBox a few times and type the text.
The bug is reproduced.

I attached the gif file below.

richTextboxBug3

I also added the source code below.

private void btnTEST_Click(object sender, EventArgs e)
{
	string rtf = @"{\rtf1\deff0 \stshfdbch3\stshfloch2\stshfhich2\stshfbi1{\fonttbl{\f0 Calibri;}{\fbiminor\f1 Times New Roman;}{\fhiminor\f2 Calibri;}{\fdbminor\f3 Times New Roman;}{\f4\fcharset129 \'b8\'bc\'c0\'ba\'20\'b0\'ed\'b5\'f1;}}{\colortbl ;\red0\green0\blue255 ;}{\*\defchp \fcs1\f1\fcs1\f1\hich\af2\loch\af2\dbch\af3\cgrid1\fs24}{\*\defpap \widctlpar}{\stylesheet {\ql\fcs1\af1\ltrch\fcs0\hich\af2\dbch\af3\loch\f2\fs24 Normal;}{\*\cs1\fcs1\af1\ltrch\fcs0\hich\af2\dbch\af3\loch\f2\fs24 Default Paragraph Font;}{\*\cs2\sbasedon1\fcs1\af1\ltrch\fcs0\hich\af2\dbch\af3\loch\f2\fs24 Line Number;}{\*\cs3\fcs1\af1\ltrch\fcs0\hich\af2\dbch\af3\loch\f2\fs24\ul\cf1 Hyperlink;}{\*\ts4\tsrowd\fcs1\af1\ltrch\fcs0\hich\af2\dbch\af3\loch\f2\fs24\ql\tscellpaddfl3\tscellpaddl108\tscellpaddfb3\tscellpaddfr3\tscellpaddr108\tscellpaddft3\tsvertalt\cltxlrtb Normal 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	this.rtb.Rtf = rtf;
}

private void btnGreenColor_Click(object sender, EventArgs e)
{
	this.rtb.SelectionColor = Color.Green;
}

private void FontName_SelectedIndexChanged(object sender, EventArgs e) 
{ 	
	string FontName = this.FontName.Text;  	
	Font font = this.rtb.SelectionFont; 	 	
	this.rtb.SelectionFont = new Font(fontName, font == null ? 10 : font.Size, 
font == null ? FontStyle.Regular : font.Style); 	
	this.rtb.Focus(); 
}

Anonymous

Sorry, I still can't reproduce your problem. But my select part is a little different from yours:


 string FontName = this.comboBox1.Text;
 Font font = this.richTextBox1.SelectionFont;
 this.richTextBox1.SelectionFont = new Font(FontName, font == null ? 10 : font.Size,
        font == null ? FontStyle.Regular : font.Style);
 this.richTextBox1.Focus();

Try uploading your project using Github so I can test

Your answer

Anonymous

2023-06-13T05:34:57.6766667+00:00

Hi @Banlim , Welcome to Microsoft Q&A. You seem to be using a custom control? Is this function of modifying fonts brought by the input method? RichTextBox it doesn't seem like word either. Can you show your source code?
Banlim 0 Reputation points

2023-06-13T06:56:28.41+00:00

I wrote the font change method in the code below.

private void FontName_SelectedIndexChanged(object sender, EventArgs e) { string FontName = this.FontName.Text; Font font = this.rtb.SelectionFont; this.rtb.SelectionFont = new Font(fontName, font == null ? 10 : font.Size, font == null ? FontStyle.Regular : font.Style); this.rtb.Focus(); }

In addition, if I type in Korean while using the "Tahoma" font, there is a problem that all text is entered as "가가가가" so only some fonts are limited to users to select.

I want you to check this bug as well. I also attached the gif file below.
Anonymous

2023-06-13T09:09:14.8133333+00:00

I don't have a Korean environment. I have not reproduced your error in English environment. I use this.richTextBox1.SelectionColor = Color.Blue; to modify the color.
Banlim 0 Reputation points

2023-06-13T10:02:10.1666667+00:00

Thanks
Anonymous

2023-06-14T08:58:42.9933333+00:00

I don't seem to see your color modifying code? And the font modification logic of this.rtb.SelectionFont and this.rtb.Font is different. Do you need different fonts in one rtb? If you use SelectionFont after selecting the text, you can achieve the font and color of the input again without changing. Regarding color modification, there are also differences between SelectionColor and forecolor. And your rtf is only displayed as "1234" to me.
Anonymous

2023-06-19T07:18:03.9566667+00:00

Sorry, I still can't reproduce your problem. But my select part is a little different from yours:

string FontName = this.comboBox1.Text; Font font = this.richTextBox1.SelectionFont; this.richTextBox1.SelectionFont = new Font(FontName, font == null ? 10 : font.Size, font == null ? FontStyle.Regular : font.Style); this.richTextBox1.Focus();

Try uploading your project using Github so I can test

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[Winform, C#] RichTextBox automatically changes 'selectionFont and Selectioncolor' when I click richTextbox

Your answer