C# Forms Picturebox 显示纯色而不是图像
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C# Forms Picturebox to show a solid color instead of an image
提问by dkarzon
Im making a little app to display the pictures of guests as they scan their cards. But i want to to display blank green or red (green if the guest exists without a photo and red if they dont exist)
我正在制作一个小应用程序来显示客人扫描卡片时的照片。但我想显示空白的绿色或红色（如果客人没有照片，则为绿色，如果不存在则为红色）
But i cant figure out how to create a blank colour image.
但我不知道如何创建一个空白的彩色图像。
Bitmap bmRed = new Bitmap(imgbox.Width, imgbox.Height, PixelFormat.Format24bppRgb);
imgbox.Image = bmRed;
Thats the code i have at the moment and it just makes the box black. imgbox is a PictureBox
这就是我目前拥有的代码，它只会使框变黑。imgbox 是一个图片框
采纳答案by Jay Riggs
Don't use an image - set the BackColor property of the PictureBox:
不要使用图像 - 设置 PictureBox 的 BackColor 属性：
imgBox.BackColor = Color.Red;
回答by Andrew Keith
create a graphics context and draw using it.
创建一个图形上下文并使用它进行绘制。
using(Graphics g = Graphics.FromImage(bmRed))
{
g.FillRectangle(new SolidBrush(Color.Red),0,0,imgbox.Width,imgbox.Height);
}
回答by micahtan
How about setting the background color directly?
直接设置背景颜色怎么样？
imgbox.BackColor = Color.Red;
回答by Michael_S_
To prevent null pointer exception, create a blank bmp
为防止空指针异常，创建一个空白的bmp
myPicBox.Image = new Bitmap(myPicBox.Width, myPicBox.Height);
Graphics graphics = Graphics.FromImage(myPicBox.Image);
Brush brush = new SolidBrush(Color.Gray);
graphics.FillRectangle(brush, new System.Drawing.Rectangle(0, 0, myPicBox.Width, myPicBox.Height));
回答by Srivishnu
Single statement:
单一声明：
Graphics.FromImage(PicBox.Image=new bitmap(PicBox.Size)).FillRectangle(Brushes.Red,new Rectangle (Point.EMPTY,PicBox.Size));
