求高手 C#函数转为vb.net lambda表达式

[mlrhmj]

因为涉及到lambda表达式

  
        public static string GetHtml(string url)
        {
            var req = WebRequest.Create(url) as HttpWebRequest;
            if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
            {
                ServicePointManager.ServerCertificateValidationCallback = ServicePointManager.ServerCertificateValidationCallback + ((a, b, c, d) => { return true; });
                //ServicePointManager.ServerCertificateValidationCallback += (a, b, c, d) => { return true; };
                req.ProtocolVersion = HttpVersion.Version10;
            }
            req.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36";
            req.Method = "GET";
            var rep = req.GetResponse();
            using (var stream = new StreamReader(rep.GetResponseStream()))
            {
                var html = stream.ReadToEnd();
                return html;
            }
        }

[threenewbee]

同样的问题不要重复发 https://bbs.csdn.net/topics/392552454

[以专业开发人员为伍]

vb.net 跟 c# 没有什么本质差别。例如

Function(a As String, b As Integer)
                                   Return True
                               End Function

[以专业开发人员为伍]

除此以外，就好像c# V7 版本支持类似

=> true;

这样的语法一样，现在 vb.net 也同样支持单行函数，例如

Function(a As String, b As Integer) True

[mlrhmj]

引用 2 楼 以专业开发人员为伍 的回复:

除此以外，就好像c# V7 版本支持类似

=> true;

这样的语法一样，现在 vb.net 也同样支持单行函数，例如

Function(a As String, b As Integer) True

兄弟 感谢你的回答，但是我刚才试了下，还是转换不了

[jhonsonzhang]

感觉C#的lamada表达式没vb科学。举个例子，C#机器学习情绪分析的源码中：
IEnumerable<(SentimentData sentiment, SentimentPrediction prediction)> sentimentsAndPredictions = sentiments.Zip(predictedResults, (sentiment, prediction) => (sentiment, prediction));
当初我看见这鸟意思啊，后来还是自己摸索出来了，转成VB的就科学好多。
Dim sentimetnsAndPredictions As IEnumerable(Of (sentiment As SentimentData, prediction As SentimentPrediction)) = sentiments.Zip(predictedResults, Function(x, y) (x, y))

[jhonsonzhang]

弱弱的说下，楼主粘的C#源码，都没lamda表达式。，我都不想看这个源码了，我找了个我10多年前写的vb.net爬虫代码，应该比贴出来的C#代码更好。
Public Shared Function getHtml(ByVal urlS As String) As String
If IsNothing(urlS) Or urlS = String.Empty Then
Return String.Empty
End If
Dim myRequest As HttpWebRequest = HttpWebRequest.Create(urlS)
Dim myResponse As HttpWebResponse

Try
myRequest.Timeout = 20000
myResponse = CType(myRequest.GetResponse(), HttpWebResponse)
myRequest.AllowAutoRedirect = False
If myResponse.StatusCode = HttpStatusCode.BadRequest Then
myResponse.Close()
myRequest.Abort()
Return String.Empty
End If

Dim sr As New StreamReader(myResponse.GetResponseStream, System.Text.Encoding.UTF8)
Dim StrB As New StringBuilder()
StrB.Append(Trim(sr.ReadToEnd))
sr.Close()
myResponse.Close()
myRequest.Abort()
Return StrB.ToString
Catch

If Not IsNothing(myRequest) Then
myRequest.Abort()
If Not IsNothing(myResponse) Then
myResponse.Close()
End If
End If
Return String.Empty
End Try

End Function

都没升级代码的必要，也挺清晰的。

[橘子皮...]

我觉得lamada写法是简洁了，但是阅读性很差