RichTextBox Text alignment issue with .NET4.8

Question

When compared the text alignment with RichTextBox, behavior has changed from .Net4.6.1 to .Net4.8.

Any help on how the earlier behavior of .Net 4.6.1 can be achieved in .Net4.8?

public Form1()
    {
        InitializeComponent();

        
        RichTextBox richTextBox1 = new RichTextBox()
        {
            Width = 300,
            Height = 20,
            Location = new Point(100, 100)
        };

        richTextBox1.Text = "中文_Dummy_Text";

        TextBox textBox = new TextBox()
        {
            Width = 300,
            Height = 20,
            Location = new Point(100, 200)
        };

        textBox.Text = "中文_Dummy_Text";

        this.Controls.Add(richTextBox1);
        this.Controls.Add(textBox);

    }

There was a big change in .NET 4.7, [this code](https://stackoverflow.com/a/34358642/17034) was added to Winforms. Yet another one without attribution :( You can get the old one back with `cp.ClassName = "RichEdit20W";` But realistically this is a simple mistake, just increase the Height a bit so the text can fit. — Hans Passant, Aug 19 '20 at 11:52
@HansPassant - This issue occurs when text contains fonts like chinese/japanese. But when Text is only of english font then there is no issue.So adjusting height will have problem in current working scenarios. — MV Sreedhar, Aug 19 '20 at 13:49
@HansPassant tried code snippet you mentioned but with no success. however, I could see cp.className is already "RichEdit50W" — MV Sreedhar, Aug 19 '20 at 13:56

score 2 · Answer 1 · answered Aug 20 '20 at 08:39

Adding the runtime setting in App.Config (as below) reverted back to the older RTB in .NET 4.8.

<?xml version="1.0" encoding="utf-8"?>
    <configuration>
        <startup> 
            <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8"/>
        </startup>
      <runtime>
         <AppContextSwitchOverrides value="Switch.System.Windows.Forms.DoNotLoadLatestRichEditControl=true"/>
      </runtime>
    
    </configuration>

score 0 · Answer 2 · answered Aug 20 '20 at 13:45

0

Setting multiline property to false also restores the earlier behavior of RTB

richTextBox1.Multiine = false

answered Aug 20 '20 at 13:45

MV Sreedhar

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RichTextBox Text alignment issue with .NET4.8

2 Answers2