使用selenium.WebDriver截取屏幕截图时出现System.NullReferenceException

Question

有一些问题。我正在使用带有C＃的webdriver。这是代码

 ITakesScreenshot screenshotDriver = driver as ITakesScreenshot;
 Screenshot screenshot = screenshotDriver.GetScreenshot();
 screenshot.SaveAsFile("c:/Image_23.png", System.Drawing.Imaging.ImageFormat.Jpeg);

然后它会为该行抛出System.NullReferenceException：

 Screenshot screenshot = screenshotDriver.GetScreenshot();

我错在哪里？

Answer 1

当您将对象保留为null时，会发生System.NullReferenceException。在您的代码中Screenshot = screenshot = screenshotDriver.GetScreenshot();保留为null，请确保在尝试编译之前将值放入其中