货币转换器有时停止工作！解决这个问题 [英] currency convertor some times stop working! solve this problem

问题描述

远程服务器返回错误：（503）服务器不可用。



第40行：Dim url As String = String.Format（http：// www .google.com / ig / calculator？hl = en&q = {2} {0}％3D％3F {1}，fromCurrency.ToUpper（），toCurrency.ToUpper（），amount）

第41行：昏暗的响应因为String = web.DownloadString（url）





指导我如何解决这个问题，我有一个货币转换器。 www.abbasiandcompany.com/currencyconvertor.aspx

The remote server returned an error: (503) Server Unavailable.

Line 40: Dim url As String = String.Format("http://www.google.com/ig/calculator?hl=en&q={2}{0}%3D%3F{1}", fromCurrency.ToUpper(), toCurrency.ToUpper(), amount)
Line 41: Dim response As String = web.DownloadString(url)


guide me how can I solve this problem, I have a currency convertor. www.abbasiandcompany.com/currencyconvertor.aspx

推荐答案

确保您始终拥有有效的互联网连接！



在web.DownloadString（url）周围试一试，并在catch部分显示服务不可用等消息。



当使用像谷歌这样的第三方服务时，由于缺少互联网连接而无法以任何其他方式解决问题

Make sure that you have an active internet connection at all times!

Put a try/catch around "web.DownloadString(url)" and show a message like "Service not available" in the catch part.

When using a 3rd party service like Google you cannot solve the problem in any other way when it''s not available because of missing internet connection

这是一个你可能无法解决的问题： a href =http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html>这里的解释 [ ^ ]。

That is a problem you probably cannot solve: an explanation here[^].

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