/// <summary>
/// Converts a string to an HTML-encoded string
/// </summary>
/// <param name="value">The string to encode</param>
/// <param name="attributeQuotesType">HTML attribute quotes type</param>
/// <returns>The encoded string</returns>
public static string HtmlAttributeEncode(string value,
HtmlAttributeQuotesType attributeQuotesType = HtmlAttributeQuotesType.Double)
{
char quoteCharValue = '"';
string quoteCharReference = """; // use `"` instead of `"`, because it is shorter
if (attributeQuotesType == HtmlAttributeQuotesType.Single)
{
quoteCharValue = '\'';
quoteCharReference = "'";
}
if (string.IsNullOrWhiteSpace(value) || !ContainsHtmlAttributeEncodingChars(value, quoteCharValue))
{
return(value);
}
string result;
StringBuilder sb = StringBuilderPool.GetBuilder();
using (var writer = new StringWriter(sb))
{
int charCount = value.Length;
for (int charIndex = 0; charIndex < charCount; charIndex++)
{
char charValue = value[charIndex];
switch (charValue)
{
case '"':
case '\'':
if (charValue == quoteCharValue)
{
writer.Write(quoteCharReference);
}
else
{
writer.Write(charValue);
}
break;
case '&':
writer.Write("&");
break;
case '<':
writer.Write("<");
break;
default:
writer.Write(charValue);
break;
}
}
writer.Flush();
result = writer.ToString();
}
StringBuilderPool.ReleaseBuilder(sb);
return(result);
}
/// <summary>
/// Converts a string to an HTML-encoded string
/// </summary>
/// <param name="value">The string to encode</param>
/// <param name="attributeQuotesType">HTML attribute quotes type</param>
/// <returns>The encoded string</returns>
public static string HtmlAttributeEncode(string value,
HtmlAttributeQuotesType attributeQuotesType = HtmlAttributeQuotesType.Double)
{
char quoteCharValue = '"';
string quoteCharReference = """; // use `"` instead of `"`, because it is shorter
if (attributeQuotesType == HtmlAttributeQuotesType.Single)
{
quoteCharValue = '\'';
quoteCharReference = "'";
}
if (string.IsNullOrWhiteSpace(value) || !ContainsHtmlAttributeEncodingChars(value, quoteCharValue))
{
return value;
}
string result;
using (var writer = new StringWriter())
{
int charCount = value.Length;
for (int charIndex = 0; charIndex < charCount; charIndex++)
{
char charValue = value[charIndex];
switch (charValue)
{
case '"':
case '\'':
if (charValue == quoteCharValue)
{
writer.Write(quoteCharReference);
}
else
{
writer.Write(charValue);
}
break;
case '&':
writer.Write("&");
break;
case '<':
writer.Write("<");
break;
default:
writer.Write(charValue);
break;
}
}
writer.Flush();
result = writer.ToString();
}
return result;
}
