cefsharp获取网页完整内容

说明：由于很多文件无法获取到完整内容，再者具体文件内容在Filter里面进行了控制，而Fileter的内容依赖于IRequestHandler所以，外部只能操作Handler得到数据。 所以需要在，Filter和Hanlder类中，使用事件来传递具体的内容。代码如下。 Filter类如下：

public class TestImageFilter : IResponseFilter  
    {  
        public event Action NotifyData;  
        private int contentLength = 0;  
        private List dataAll = new List();  

        public void SetContentLength(int contentLength)  
        {  
            this.contentLength = contentLength;  
        }  

        public FilterStatus Filter(System.IO.Stream dataIn, out long dataInRead, System.IO.Stream dataOut, out long dataOutWritten)  
        {  
            try  
            {  
                if (dataIn == null)  
                {  
                    dataInRead = 0;  
                    dataOutWritten = 0;  

                    return FilterStatus.Done;  
                }  

                dataInRead = dataIn.Length;  
                dataOutWritten = Math.Min(dataInRead, dataOut.Length);  

                dataIn.CopyTo(dataOut);  
                dataIn.Seek(0, SeekOrigin.Begin);  
                byte[] bs = new byte[dataIn.Length];  
                dataIn.Read(bs, 0, bs.Length);  
                dataAll.AddRange(bs);  

                if (dataAll.Count == this.contentLength)  
                {  
                    // 通过这里进行通知  
                    NotifyData(dataAll.ToArray());  

                    return FilterStatus.Done;  
                }  
                else if (dataAll.Count < this.contentLength)  
                {  
                    dataInRead = dataIn.Length;  
                    dataOutWritten = dataIn.Length;  

                    return FilterStatus.NeedMoreData;  
                }  
                else  
                {  
                    return FilterStatus.Error;  
                }  
            }  
            catch (Exception ex)  
            {  
                dataInRead = dataIn.Length;  
                dataOutWritten = dataIn.Length;  

                return FilterStatus.Done;  
            }  
        }  

        public bool InitFilter()  
        {  
            return true;  
        }  
    }  

Filter类有了，那我们如何知道数据流的具体长度呢？这就需要在Handler的实现的其他方法里面寻找了。

bool IRequestHandler.OnResourceResponse(IWebBrowser browserControl, IBrowser browser, IFrame frame, IRequest request, IResponse response)  
        {  
            //NOTE: You cannot modify the response, only the request  
            // You can now access the headers  
            //var headers = response.ResponseHeaders;  
            try  
            {  
                var content_length = int.Parse(response.ResponseHeaders["Content-Length"]);  
                if (this.filter != null)  
                {  
                    this.filter.SetContentLength(content_length);  
                }  
            }  
            catch { }  
            return false;  
        }  

        private TestImageFilter filter = null;  
        public event Action NotifyData;  

        IResponseFilter IRequestHandler.GetResourceResponseFilter(IWebBrowser browserControl, IBrowser browser, IFrame frame, IRequest request, IResponse response)  
        {  
            var url = new Uri(request.Url);  
            if (url.AbsoluteUri.Contains("http://test.test.com/somehead?"))  
            {  
                this.filter = new TestImageFilter();  
                filter.NotifyData += filter_NotifyData;  

                return filter;  
            }  

            return null;  
        }  

        void filter_NotifyData(byte[] data)  
        {  
            if (NotifyData != null)  
            {  
                NotifyData(data);  
            }  
        }  

此方法位IRequestHandler的一部分实现，通过实现函数：IRequestHandler.GetResourceResponseFilter得到资源文件的长度，然后长度传入Filter,在Filter中控制从而得到整个数据的真正长度。