Execute JavaScript using Selenium WebDriver in C#

How is this achieved? Here it says the java version is:

WebDriver driver; // Assigned elsewhere
JavascriptExecutor js = (JavascriptExecutor) driver;
js.executeScript("return document.title");

But I can't find the C# code to do this.

The object, method, and property names in the .NET language bindings do not exactly correspond to those in the Java bindings. One of the principles of the project is that each language binding should "feel natural" to those comfortable coding in that language. In C#, the code you'd want for executing JavaScript is as follows

IWebDriver driver; // assume assigned elsewhere
IJavaScriptExecutor js = (IJavaScriptExecutor)driver;
string title = (string)js.ExecuteScript("return document.title");

Note that the complete documentation of the WebDriver API for .NET can be found at this link.

I prefer to use an extension method to get the scripts object:

public static IJavaScriptExecutor Scripts(this IWebDriver driver)
{
    return (IJavaScriptExecutor)driver;
}

Used as this:

driver.Scripts().ExecuteScript("some script");

the nuget package Selenium.Support already contains an extension method to help with this. Once it is included, one liner to executer script

  Driver.ExecuteJavaScript("console.clear()");

or

  string result = Driver.ExecuteJavaScript<string>("console.clear()");

How about a slightly simplified version of @Morten Christiansen's nice extension method idea:

public static object Execute(this IWebDriver driver, string script)
{
    return ((IJavaScriptExecutor)driver).ExecuteScript(script);
}

// usage
var title = (string)driver.Execute("return document.title");

or maybe the generic version:

public static T Execute<T>(this IWebDriver driver, string script)
{
    return (T)((IJavaScriptExecutor)driver).ExecuteScript(script);
}

// usage
var title = driver.Execute<string>("return document.title");

You could also do:

public static IWebElement FindElementByJs(this IWebDriver driver, string jsCommand)
{
    return (IWebElement)((IJavaScriptExecutor)driver).ExecuteScript(jsCommand);
}

public static IWebElement FindElementByJsWithWait(this IWebDriver driver, string jsCommand, int timeoutInSeconds)
{
    if (timeoutInSeconds > 0)
    {
        var wait = new WebDriverWait(driver, TimeSpan.FromSeconds(timeoutInSeconds));
        wait.Until(d => d.FindElementByJs(jsCommand));
    }
    return driver.FindElementByJs(jsCommand);
}

public static IWebElement FindElementByJsWithWait(this IWebDriver driver, string jsCommand)
{
    return FindElementByJsWithWait(driver, jsCommand, s_PageWaitSeconds);
}

public void javascriptclick(String element)
	{ 
		WebElement webElement=driver.findElement(By.xpath(element));
		JavascriptExecutor js = (JavascriptExecutor) driver;
		
		js.executeScript("arguments[0].click();",webElement);	
		System.out.println("javascriptclick"+" "+ element);
		
	}

public static class Webdriver
{        
    public static void ExecuteJavaScript(string scripts)
    {
        IJavaScriptExecutor js = (IJavaScriptExecutor)driver;
        js.ExecuteScript(scripts);
    }

    public static T ExecuteJavaScript<T>(string scripts)
    {
        IJavaScriptExecutor js = (IJavaScriptExecutor)driver;
        return (T)js.ExecuteScript(scripts);
    }
}

In your code you can then do

string test = Webdriver.ExecuteJavaScript<string>(" return 'hello World'; ");
int test = Webdriver.ExecuteJavaScript<int>(" return 3; ");

The shortest code

ChromeDriver drv = new ChromeDriver();

drv.Navigate().GoToUrl("https://stackoverflow.com/questions/6229769/execute-javascript-using-selenium-webdriver-in-c-sharp");

drv.ExecuteScript("return alert(document.title);");