带大小写忽略的Replace

       #region 以下函数用于忽略大小写替换操作

        public static string Replace(string Expression, string Find, string Replacement)

        {

            return Replace(Expression, Find, Replacement, StringComparison.OrdinalIgnoreCase);

        }

        public static string Replace(string Expression, string Find, string Replacement, StringComparison Compare)

        {

            if (string.IsNullOrEmpty(Expression) || string.IsNullOrEmpty(Find))

            {

                return Expression;

            }

            int iIndex = 0;

            int length = Expression.Length;

            int iFindLength = Find.Length;

            StringBuilder builder = new StringBuilder(length);

            while (iIndex < length)

            {

                int iFindIndex = Expression.IndexOf(Find, iIndex, Compare);

                if (iFindIndex < 0)

                {

                    builder.Append(Expression.Substring(iIndex));

                    break;

                }

                builder.Append(Expression.Substring(iIndex, iFindIndex - iIndex));

                builder.Append(Replacement);

                iIndex = iFindIndex + iFindLength;

            }

            return builder.ToString();

        }

        #endregion

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