Selenium内置了截图方法，只能截取浏览器中显示的内容，找到一个全屏截图的方式（内置截图+控制滚动条，图片拼接）
```C#
public static Bitmap GetEntereScreenshot(IWebDriver _driver)
{
Bitmap stitchedImage = null;
try
{
long totalwidth1 = (long)((IJavaScriptExecutor)_driver).ExecuteScript("return document.body.offsetWidth");//documentElement.scrollWidth");
long totalHeight1 = (long)((IJavaScriptExecutor)_driver).ExecuteScript("return  document.body.parentNode.scrollHeight");
int totalWidth = (int)totalwidth1;
int totalHeight = (int)totalHeight1;
// Get the Size of the Viewport
long viewportWidth1 = (long)((IJavaScriptExecutor)_driver).ExecuteScript("return document.body.clientWidth");//documentElement.scrollWidth");
long viewportHeight1 = (long)((IJavaScriptExecutor)_driver).ExecuteScript("return window.innerHeight");//documentElement.scrollWidth");
int viewportWidth = (int)viewportWidth1;
int viewportHeight = (int)viewportHeight1;
// Split the Screen in multiple Rectangles
List<Rectangle> rectangles = new List<Rectangle>();
// Loop until the Total Height is reached
for (int i = 0; i < totalHeight; i += viewportHeight)
{
int newHeight = viewportHeight;
// Fix if the Height of the Element is too big
if (i + viewportHeight > totalHeight)
{
newHeight = totalHeight - i;
}
// Loop until the Total Width is reached
for (int ii = 0; ii < totalWidth; ii += viewportWidth)
{
int newWidth = viewportWidth;
// Fix if the Width of the Element is too big
if (ii + viewportWidth > totalWidth)
{
newWidth = totalWidth - ii;
}
// Create and add the Rectangle
Rectangle currRect = new Rectangle(ii， i， newWidth， newHeight);
rectangles.Add(currRect);
}
}
// Build the Image
stitchedImage = new Bitmap(totalWidth， totalHeight);
// Get all Screenshots and stitch them together
Rectangle previous = Rectangle.Empty;
foreach (var rectangle in rectangles)
{
// Calculate the Scrolling (if needed)
if (previous != Rectangle.Empty)
{
int xDiff = rectangle.Right - previous.Right;
int yDiff = rectangle.Bottom - previous.Bottom;
// Scroll
//selenium.RunScript(String.Format("window.scrollBy({0}， {1})"， xDiff， yDiff));
((IJavaScriptExecutor)_driver).ExecuteScript(String.Format("window.scrollBy({0}， {1})"， xDiff， yDiff));
System.Threading.Thread.Sleep(200);
}
// Take Screenshot
var screenshot = ((ITakesScreenshot)_driver).GetScreenshot();
// Build an Image out of the Screenshot
Image screenshotImage;
using (MemoryStream memStream = new MemoryStream(screenshot.AsByteArray))
{
screenshotImage = Image.FromStream(memStream);
}
// Calculate the Source Rectangle
Rectangle sourceRectangle = new Rectangle(viewportWidth - rectangle.Width， viewportHeight - rectangle.Height， rectangle.Width， rectangle.Height);
// Copy the Image
using (Graphics g = Graphics.FromImage(stitchedImage))
{
g.DrawImage(screenshotImage， rectangle， sourceRectangle， GraphicsUnit.Pixel);
}
// Set the Previous Rectangle
previous = rectangle;
}
}
catch (Exception ex)
{
// handle
}
return stitchedImage;
}
```
　　后的是根据传入的元素和全屏截图，获取到价格元素的图片
```C#
public static Image SnapshotV2(this IWebElement element， Bitmap bitmap)
{
Size size = new Size(
Math.Min(element.Size.Width， bitmap.Width)，
Math.Min(element.Size.Height， bitmap.Height));
Rectangle crop = new Rectangle(element.Location， size);
return bitmap.Clone(crop， bitmap.PixelFormat);
}
```
　　运行效果如下: