HttpUtility.HtmlDecode 无法解码 '

本文关键字：解码 HtmlDecode HttpUtility | 更新日期: 2023-09-27 18:34:51

我正在使用.net 4.5和

HttpUtility.HtmlDecode无法解码&#39哪个是单引号字符

知道为什么吗？

在 Windows 8.1 上使用 C# .net 4.5 WPF

这里失败的文本

Apple 13&#39&#39 Z0RA30256 MacBook Pro Retina

以下是框架版本

#region Assembly System.Web.dll, v4.0.0.0
// C:'Program Files (x86)'Reference Assemblies'Microsoft'Framework'.NETFramework'v4.5'System.Web.dll
#endregion

HttpUtility.HtmlDecode 无法解码 '

使用构建的 it HtmlDecode 方法无法处理此问题，您必须查找/替换它或以其他方式变通。

下面是HtmlDecode的源代码 - 您可以从注释中明确看到您的方案被考虑且不受支持 - HTML 实体必须与;绑定，否则它们根本不是 HTML 实体。浏览器可以原谅不正确的标记，并相应地进行补偿。

// We found a '&'. Now look for the next ';' or '&'. The idea is that
// if we find another '&' before finding a ';', then this is not an entity,
// and the next '&' might start a real entity (VSWhidbey 275184)

这是 .NET HtmlDecode 的完整源代码 HttpUtility ，如果你想适应行为。

http://referencesource.microsoft.com/#System/net/System/Net/WebUtility.cs,44d08941e6aeb00d

public static void HtmlDecode(string value, TextWriter output)
{
    if (value == null)
    {
        return;
    }
    if (output == null)
    {
        throw new ArgumentNullException("output");
    }
    if (value.IndexOf('&') < 0)
    {
        output.Write(value);        // good as is
        return;
    }
    int l = value.Length;
    for (int i = 0; i < l; i++)
    {
        char ch = value[i];
        if (ch == '&')
        {
            // We found a '&'. Now look for the next ';' or '&'. The idea is that
            // if we find another '&' before finding a ';', then this is not an entity,
            // and the next '&' might start a real entity (VSWhidbey 275184)
            int index = value.IndexOfAny(_htmlEntityEndingChars, i + 1);
            if (index > 0 && value[index] == ';')
            {
                string entity = value.Substring(i + 1, index - i - 1);
                if (entity.Length > 1 && entity[0] == '#')
                {
                    // The # syntax can be in decimal or hex, e.g.
                    //      å  --> decimal
                    //      å  --> same char in hex
                    // See http://www.w3.org/TR/REC-html40/charset.html#entities
                    ushort parsed;
                    if (entity[1] == 'x' || entity[1] == 'X')
                    {
                        UInt16.TryParse(entity.Substring(2), NumberStyles.AllowHexSpecifier, NumberFormatInfo.InvariantInfo, out parsed);
                    }
                    else
                    {
                        UInt16.TryParse(entity.Substring(1), NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out parsed);
                    }
                    if (parsed != 0)
                    {
                        ch = (char)parsed;
                        i = index; // already looked at everything until semicolon
                    }
                }
                else
                {
                    i = index; // already looked at everything until semicolon
                    char entityChar = HtmlEntities.Lookup(entity);
                    if (entityChar != (char)0)
                    {
                        ch = entityChar;
                    }
                    else
                    {
                        output.Write('&');
                        output.Write(entity);
                        output.Write(';');
                        continue;
                    }
                }
            }
        }
        output.Write(ch);
    }
}
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