C#如何将system.windows.media.brush转换为system.drawing.brush

Question

我正试图为一个TextBox添加水印。TextBox.Background是System.Windows.Media.Brush。我需要Graphics.FillRectangle(System.Drawing.Brush....)

有没有办法把中间画笔转换成画笔？

Answer 1

试试这个

System.Drawing.Brush b = new System.Drawing.SolidBrush((System.Drawing.Color)new System.Drawing.ColorConverter().ConvertFromString(new System.Windows.Media.BrushConverter().ConvertToString(mediabrush)));

Answer 2

这也适用于UWP和WinUI。用法：

var newBrush = new System.Drawing.SolidBrush(brush.ToSystemDrawingColor())

internal static System.Drawing.Color ToSystemDrawingColor(this Brush? brush)
{
    if (brush == null)
    {
        return System.Drawing.Color.Transparent;
    }

    if (brush is not SolidColorBrush solidColorBrush)
    {
        throw new NotImplementedException();
    }

    var color = solidColorBrush.Color;

    return System.Drawing.Color.FromArgb(
        alpha: color.A,
        red: color.R,
        green: color.G,
        blue: color.B);
}