c# - 检查字符串仅包含和 & 仅

Question

我有一个字符串，我只需要检查这个字符串只包含 &&

细绳

string oldStr ="       ";

我试过这样。

bool x = !string.IsNullOrWhiteSpace(oldStr);

标签： c#asp.net

Answer 1

Given your string is HTML which has been HTML encoded, you need to HTML decode it twice.

string oldStr = "       ";

var result = HttpUtility.HtmlDecode(HttpUtility.HtmlDecode(oldStr));

Console.WriteLine(string.IsNullOrWhiteSpace(result)); 

This will output true (since a non-breaking space is whitespace).