C#listbox to redraw the item, including the color

Not much else to say, on the code, look directly

First set this line, or the Properties window settings, so that you can start manual drawing, parameters have three

Normal: Auto Draw

OwnerDrawFixed: Draw manually but with the same spacing

OwnerDrawVariable: Manual drawing with different spacing

Listbox1.drawmode= drawmode.ownerdrawfixed

Then write the drawing code in the DrawItem event

            E.graphics.fillrectangle (new SolidBrush (color), e.bounds); // Draw Background            New SolidBrush (E.forecolor), e.bounds); // Draw Text            E.drawfocusrectangle (); // draw a focus frame

There is no effect of drawing the focus frame, it seems necessary that the ComboBox is only valid when Dropdownstyle=dropdownlist

If set to OwnerDrawVariable, you also need to set the MeasureItem event to return the height of each row (E. Itemwidth = 260).

If the dashed line is drawn, the pen needs to set DashStyle or DashPattern (high priority).

C#listbox to redraw the item, including the color