将字符实体转换为其 Unicode 等效项

So I need to replace all of the character entities within the html string from the db with their unicode equivilant because the flash based rss reader doesn't recognize any entities beyond the most common like &.

推荐答案

我的第一个想法是，你的 RSS 阅读器能接受实际的字符吗?如果是这样，您可以使用 HtmlDecode 和提要直接进去.

My first thought is, can your RSS reader accept the actual characters? If so, you can use HtmlDecode and feed it directly in.

如果确实需要将其转换为数字表示，则可以解析出每个实体，HtmlDecode，然后将其转换为 int 以获得基数-10 Unicode 值.然后重新插入到字符串中.

If you do need to convert it to the numeric representations, you could parse out each entity, HtmlDecode it, and then cast it to an int to get the base-10 unicode value. Then re-insert it into the string.

下面是一些代码来演示我的意思(未经测试，但可以理解):

Here's some code to demonstrate what I mean (it is untested, but gets the idea across):

string input = "Something with — or other character entities.";
StringBuilder output = new StringBuilder(input.Length);

for (int i = 0; i < input.Length; i++)
{
    if (input[i] == '&')
    {
        int startOfEntity = i; // just for easier reading
        int endOfEntity = input.IndexOf(';', startOfEntity);
        string entity = input.Substring(startOfEntity, endOfEntity - startOfEntity);
        int unicodeNumber = (int)(HttpUtility.HtmlDecode(entity)[0]);
        output.Append("&#" + unicodeNumber + ";");
        i = endOfEntity; // continue parsing after the end of the entity
    }
    else
        output.Append(input[i]);
}

我可能在某个地方有一个逐一错误，但应该很接近.

I may have an off-by-one error somewhere in there, but it should be close.

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