您应该使用的 HttpUtility.UrlDe $的C $ C（）接受编码过载：

You should use an overload of HttpUtility.UrlDecode() that accepts an encoding:

HttpUtility.UrlDecode("%F3", Encoding.GetEncoding("ISO-8859-1"))

此假设它实际上是使用ISO-8859-1编码。如果使用Windows 1250，您应该使用。 （这两个都非常相似，但它们是不相同的。）

This assumes it actually is using the ISO-8859-1 encoding. If it uses Windows-1250, you should use that. (These two are very similar, but they are not the same.)