public static int ConvertToUtf32(string s, int index)
{
CheckParameter(s, index);
if (!Char.IsSurrogate(s [index]))
{
return(s [index]);
}
if (!Char.IsHighSurrogate(s [index]) ||
index == s.Length - 1 ||
!Char.IsLowSurrogate(s [index + 1]))
{
throw new ArgumentException(String.Format("The string contains invalid surrogate pair character at {0}", index));
}
return(ConvertToUtf32(s [index], s [index + 1]));
}
public static int ConvertToUtf32(string s, int index)
{
if (s == null)
{
throw new ArgumentNullException("s");
}
if (index < 0 || index >= s.Length)
{
throw new ArgumentOutOfRangeException("index");
}
if (!Char.IsSurrogate(s [index]))
{
return(s [index]);
}
if (!Char.IsHighSurrogate(s [index]) ||
index == s.Length - 1 ||
!Char.IsLowSurrogate(s [index + 1]))
{
throw new ArgumentException(String.Format("The string contains invalid surrogate pair character at {0}", index));
}
return(ConvertToUtf32(s [index], s [index + 1]));
}
/// <summary> /// Indicates whether the specified Char object is a low surrogate. /// </summary> /// <param name="Char">The character to evaluate.</param> /// <returns>true if the numeric value of the <paramref name="Char"/> parameter ranges from U+DC00 through U+DFFF; otherwise, false.</returns> public static Boolean IsLowSurrogate(this Char Char) => Char.IsLowSurrogate(Char);
public static Boolean IsLowSurrogate(this Char c)
{
return(Char.IsLowSurrogate(c));
}