新手求助……

我也刚学！现在做了一个最简单的倒计时 只是99秒内

我在上课！下课帮你截图吧

byte[] temp = src.PixelBuffer.ToArray(); PixelBuffer报错 错误1“System.Drawing.Image”不包含“PixelBuffer”的定义，并且找不到可接受类型为“System.Drawing.Image”的第一个参数的扩展方法“PixelBuffer”(是否缺少 using 指令或程序集引用?)E:\Program Files\feiq\Recv Files\能量梯度函数\Energy Gradient\Energy Gradient\MainWindow.xaml.cs7735Energy Gradient
如何引用PixelBuffer 小白求教

DateTime dtNow = DateTime.Now;
DateTime dt = new DateTime(2016,12,31,23,59,59);
TimeSpan ts = dt - dtNow;
label1.Text = string.Format("还有{0}天{1}时{2}分{3}秒",ts.Days.ToString(),ts.Hours,ts.Minutes,ts.Seconds);

public static double GetEntropy(WriteableBitmap src)
{
double entropy = 0;
if (src != null)
{
int w = src.PixelWidth;
int h = src.PixelHeight;
byte[] temp = src.PixelBuffer.ToArray();
int[] countTemp = new int[256];
int gray = 0;
for (int i = 0; i < temp.Length; i += 4)
{
gray = (int)(temp[i] * 0.114 + temp[i + 1] * 0.587 + temp[i + 2] * 0.299);
countTemp[gray]++;
}
for (int i = 0; i < 256; i++)
{
if (countTemp[i] != 0)
{
entropy += (double)(-((countTemp[i] / (w * h)) * Math.Log10(countTemp[i] / (w * h))));
}
else
continue;
}
return entropy;
}
else
{
return 0;
}
}
/*byte[] temp = src.PixelBuffer.ToArray(); PixelBuffer报错 错误1“System.Drawing.Image”不包含“PixelBuffer”的定义，并且找不到可接受类型为“System.Drawing.Image”的第一个参数的扩展方法“PixelBuffer”(是否缺少 using 指令或程序集引用?)E:\Program Files\feiq\Recv Files\能量梯度函数\Energy Gradient\Energy Gradient\MainWindow.xaml.cs7735Energy Gradient
如何引用PixelBuffer 小白求教*/

public static double GetEntropy(WriteableBitmap src)
{
double entropy = 0;
if (src != null)
{
int w = src.PixelWidth;
int h = src.PixelHeight;
byte[] temp = src.PixelBuffer.ToArray();
int[] countTemp = new int[256];
int gray = 0;
for (int i = 0; i < temp.Length; i += 4)
{
gray = (int)(temp[i] * 0.114 + temp[i + 1] * 0.587 + temp[i + 2] * 0.299);
countTemp[gray]++;
}
for (int i = 0; i < 256; i++)
{
if (countTemp[i] != 0)
{
entropy += (double)(-((countTemp[i] / (w * h)) * Math.Log10(countTemp[i] / (w * h))));
}
else
continue;
}
return entropy;
}
else
{
return 0;
}
}
byte[] temp = src.PixelBuffer.ToArray(); PixelBuffer报错 错误1“System.Drawing.Image”不包含“PixelBuffer”的定义，并且找不到可接受类型为“System.Drawing.Image”的第一个参数的扩展方法“PixelBuffer”(是否缺少 using 指令或程序集引用?)E:\Program Files\feiq\Recv Files\能量梯度函数\Energy Gradient\Energy Gradient\MainWindow.xaml.cs7735Energy Gradient
如何引用PixelBuffer 小白求教

WriteableBitmap 是 Silverlight 里面的东西，支持跨平台，在using System.Windows.Media.Imaging;
和System.Drawing.Image;不是同一个东西