DotNet的字符轉義操作是怎樣的

本篇文章給大家分享的是有關DotNet的字符轉義操作是怎樣的，小編覺得挺實用的，因此分享給大家學習，希望大家閱讀完這篇文章后可以有所收獲，話不多說，跟著小編一起來看看吧。

  在項目中使用到字符的轉義，現在提供一種字符轉義和反轉義的操作方法：

1.轉義符操作：

        /// <summary>
        /// 轉義符操作
        /// </summary>
        /// <param name="s"></param>
        /// <param name="charToEliminate"></param>
        /// <returns></returns>
        public static string EscapeChar(string s, char charToEliminate)
        {
            char escapeChar;
            char substituteChar;

            GetEscapeAndEncodingChars(charToEliminate, out escapeChar, out substituteChar);

            int i;
            for (i = 0; i < s.Length; i++)
            {
                if (s[i] == charToEliminate || s[i] == escapeChar)
                {
                    break;
                }
            }

            if (i == s.Length)
            {
                return s;
            }

            var sb = new StringBuilder(s.Substring(0, i), s.Length + 16);

            for (; i < s.Length; i++)
            {
                var c = s[i];

                if (c == charToEliminate)
                {
                    sb.Append(escapeChar);
                    sb.Append(substituteChar);
                }
                else if (c == escapeChar)
                {
                    sb.Append(escapeChar, 2);
                }
                else
                {
                    sb.Append(c);
                }
            }

            return sb.ToString();
        }

2.反轉義符操作：

        /// <summary>
        /// 反轉義符操作
        /// </summary>
        /// <param name="s"></param>
        /// <param name="eliminatedChar"></param>
        /// <returns></returns>
        public static string UnescapeChar(string s, char eliminatedChar)
        {
            ArgumentValidator.ThrowIfNull(s, "s");

            char escapeChar;
            char substituteChar;

            GetEscapeAndEncodingChars(eliminatedChar, out escapeChar, out substituteChar);

            if (-1 == s.IndexOf(escapeChar))
            {
                return s;
            }

            var sb = new StringBuilder(s.Length);

            for (var i = 0; i < s.Length; i++)
            {
                var c = s[i];

                var next = i + 1;

                if (c != escapeChar || next == s.Length)
                {
                    sb.Append(c);
                    continue;
                }

                if (s[next] == escapeChar)
                {
                    sb.Append(escapeChar);
                    i++;
                }
                else if (s[next] == substituteChar)
                {
                    sb.Append(eliminatedChar);
                    i++;
                }
                else
                {
                    var msg = ("Invalid escaped string '{0}'. Position {1} has escape character, but it is not followed by "
                        + "another escape character or by the substitute character").Fi(s, i);
                    throw new AssertionViolationException(msg);
                }
            }

            return sb.ToString();
        }

3.獲取轉義符和編碼字符：

        /// <summary>
        /// 獲取轉義符和編碼字符
        /// </summary>
        /// <param name="charToEliminate"></param>
        /// <param name="escapeChar"></param>
        /// <param name="encodingChar"></param>
        private static void GetEscapeAndEncodingChars(char charToEliminate, out char escapeChar, out char encodingChar)
        {
            var i = MEscapeChars[0] == charToEliminate ? 1 : 0;
            escapeChar = MEscapeChars[i];
            i++;

            if (MEscapeChars[i] == charToEliminate)
            {
                i++;
            }
            encodingChar = MEscapeChars[i];
        }

以上就是DotNet的字符轉義操作是怎樣的，小編相信有部分知識點可能是我們日常工作會見到或用到的。希望你能通過這篇文章學到更多知識。更多詳情敬請關注億速云行業資訊頻道。