| public static ToChars ( int codePoint ) : char[] | ||
| codePoint | int | |
| Результат | char[] | |
/// <summary>
/// Returns the index within this string of the first occurrence of the
/// specified <paramref name="codePoint"/>.
/// </summary>
/// <param name="str">this string</param>
/// <param name="codePoint">a codePoint representing a single character or surrogate pair</param>
/// <returns>the index of the first occurrence of the character (or surrogate pair) in the string,
/// or <c>-1</c> if the character (or surrogate pair) doesn't occur.</returns>
public static int IndexOf(this string str, int codePoint)
{
if (codePoint >= 0 && codePoint < Character.MIN_SUPPLEMENTARY_CODE_POINT)
{
// handle most cases here (codePoint is a BMP code point)
return(str.IndexOf((char)codePoint));
}
else if (codePoint >= Character.MIN_CODE_POINT && codePoint <= Character.MAX_CODE_POINT)
{
// codePoint is a surogate pair
char[] pair = Character.ToChars(codePoint);
char hi = pair[0];
char lo = pair[1];
for (int i = 0; i < str.Length - 1; i++)
{
if (str[i] == hi && str[i + 1] == lo)
{
return(i);
}
}
}
// codePoint is negative or not found in string
return(-1);
}
/// <summary>
/// Appends the string representation of the <paramref name="codePoint"/>
/// argument to this sequence.
///
/// <para>
/// The argument is appended to the contents of this sequence.
/// The length of this sequence increases by <see cref="Character.CharCount(int)"/>.
/// </para>
/// <para>
/// The overall effect is exactly as if the argument were
/// converted to a <see cref="char"/> array by the method
/// <see cref="Character.ToChars(int)"/> and the character in that array
/// were then <see cref="StringBuilder.Append(char[])">appended</see> to this
/// <see cref="StringBuilder"/>.
/// </para>
/// </summary>
/// <param name="text">This <see cref="StringBuilder"/>.</param>
/// <param name="codePoint">a Unicode code point</param>
/// <returns>a reference to this object.</returns>
public static StringBuilder AppendCodePoint(this StringBuilder text, int codePoint)
{
text.Append(Character.ToChars(codePoint));
return(text);
}
