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Editorial Team
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Asked: 2026-06-02T02:09:41+00:00

I have the following code Font oldf; Font newf; oldf = this.richText.SelectionFont; if (oldf.Bold)

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I have the following code

Font oldf;
Font newf;

oldf = this.richText.SelectionFont;

if (oldf.Bold)
  newf = new Font(oldf, oldf.Style & ~FontStyle.Bold);
else
  newf = new Font(oldf, oldf.Style | FontStyle.Bold);

I know that code, but I don’t know what did it mean these symbols &,| and ~ .
is these mean ( and , or , not ) or Am I wrong ?

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1 Answer

  1. Editorial Team

    Like others have stated, they are bitwise operators. FontStyle is a bit field (set of flags).

    oldf.Style & ~FontStyle.Bold

    This means “remove bold” but looking at the underlying math, you get something like this.

    (a) FontStyle.Bold  = 0b00000010;  // just a guess, it doesn't really matter
(b) oldf.Style      = 0b11100111;  // random mix here
// we want Bold "unset"
(c) ~FontStyle.Bold = 0b11111101;
=> (b) & (c)        = 0b11100101;  // oldf without Bold

    new Font(oldf, oldf.Style | FontStyle.Bold)

    This means that we want to Bold the font. By OR’ing it with the exist value (this also means that something that’s already bold will remain bold).

    (a) FontStyle.Bold  = 0b00000010;  // just a guess, it doesn't really matter
(b) oldf.Style      = 0b11100000;  // random mix here
=> (b) | (c)        = 0b11100010;  // oldf with Bold
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