CefSharp资源拦截及自定义处理代码

在CefSharp中，可以通过实现`IRequestHandler`接口来实现资源拦截及自定义处理。以下是一个示例代码：

public class CustomRequestHandler : IRequestHandler
{
    public bool OnBeforeBrowse(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool isRedirect)
    {
        return false;
    }

    public bool OnBeforeResourceLoad(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IRequestCallback callback)
    {
        // 判断资源类型
        if (request.ResourceType == ResourceType.Image)
        {
            // 拦截图片资源
            callback.Cancel();
            return true;
        }
        return false;
    }

    public void OnResourceResponse(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response)
    {
        
    }

    public bool GetAuthCredentials(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, bool isProxy, string host, int port, string realm, string scheme, IAuthCallback callback)
    {
        return false;
    }

    public bool OnCertificateError(IWebBrowser chromiumWebBrowser, IBrowser browser, CefErrorCode errorCode, string requestUrl, ISslInfo sslInfo, IRequestCallback callback)
    {
        return false;
    }

    public void OnPluginCrashed(IWebBrowser chromiumWebBrowser, IBrowser browser, string pluginPath)
    {
        
    }

    public bool OnRenderProcessTerminated(IWebBrowser chromiumWebBrowser, IBrowser browser, CefTerminationStatus status)
    {
        return false;
    }

    public bool OnResourceRedirect(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, ref string newUrl)
    {
        return false;
    }

    public bool OnQuotaRequest(IWebBrowser chromiumWebBrowser, IBrowser browser, string originUrl, long newSize, IRequestCallback callback)
    {
        return false;
    }

    public void OnRenderViewReady(IWebBrowser chromiumWebBrowser, IBrowser browser)
    {
        
    }

    public void OnResourceLoadComplete(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response, UrlRequestStatus status, long receivedContentLength)
    {
        
    }

    public bool OnProtocolExecution(IWebBrowser chromiumWebBrowser, IBrowser browser, string url)
    {
        return false;
    }

    public void OnRenderProcessThreadCreated(IWebBrowser chromiumWebBrowser, IBrowser browser, IRenderProcessHost renderProcessHost)
    {
        
    }

    public bool OnResourceResponseFilter(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response, IResponseFilter filter)
    {
        return false;
    }

    public void OnResourceLoadError(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, CefErrorCode errorCode, string errorText, IRequestCallback callback)
    {
        
    }
}

在上述代码中，我们主要实现了`OnBeforeResourceLoad`方法，用于拦截资源请求并进行处理。在本示例中，我们拦截了所有类型为图片的资源，并取消其加载，实现了资源拦截的功能。

要应用这个自定义请求处理程序，可以通过以下方式设置：

var browser = new ChromiumWebBrowser();
browser.RequestHandler = new CustomRequestHandler();