.NET软件之如何将图片按照屏幕/控件的指定大小显示

        //图像转换函数并返回Bitmap类型数据
private Bitmap ConvertBitmapToScreen(string strBitmapPath, int iBitmapWidth, int iBitmapHeight)
{
//装载图片
System.Drawing.Image image = System.Drawing.Image.FromFile(strBitmapPath);

//获取图片的实际宽度与高度
int srcWidth = image.Width;
int srcHeight = image.Height;

if (iBitmapHeight == 0 && iBitmapWidth == 0)
{
return null;
}

//创建Bitmap对象，并设置Bitmap的宽度和高度。
Bitmap bmp = new Bitmap(iBitmapWidth, iBitmapHeight);

//从Bitmap创建一个System.Drawing.Graphics对象，用来绘制高质量的缩小图。
System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bmp);
//设置 System.Drawing.Graphics对象的SmoothingMode属性为HighQuality
gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//下面这个也设成高质量
gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
//下面这个设成High
gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//把原始图像绘制成上面所设置宽高的缩小图
System.Drawing.Rectangle rectDestination = new System.Drawing.Rectangle(0, 0, iBitmapWidth, iBitmapHeight);
gr.DrawImage(image, rectDestination, 0, 0, srcWidth, srcHeight, GraphicsUnit.Pixel);

image.Dispose();

return bmp;
}