• 区分全角和半角的字符串指定长度截取(或填充)


     
            /// <summary>
            /// 获取制定字符串的前L位字符,注:半角字符只算半个字符
            /// </summary>
            /// <param name="s">制定的字符串</param>
            /// <param name="l">长度</param>
            /// <param name="adddot">超出长度时追加的字符</param>
            /// <returns></returns>
            public static string SubGBString(string s, int l, string adddot)
            {
                string c = @"abcdefghijklmnopqrstuvwzxyABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890!@#$%^&*()-=_+[];',./{}:\<>? \|";
                string cc = "";
                int p = 0;
                for (int i = 0; i < s.Length; i++)
                {
                    cc = s.Substring(i, 1);
                    if (c.IndexOf(cc) >= 0)
                        p++;
                    else
                        p = p + 2;

                    if ((p - 1) / 2 >= l)
                    {
                        string reval=s.Substring(0, i);
                        reval = reval + adddot;
                            return reval;
                    }
                }

                return s;
            }


            /// <summary>
            /// 获取制定字符串的前L位字符,注:全角字符算2个字符
            /// </summary>
            /// <param name="s">制定的字符串</param>
            /// <param name="l">长度</param>
            /// <param name="r">长度不够时填充的字符</param>
            /// <returns></returns>
            public static string SubByteString(string s, int l, string r)
            {
                string c = @"abcdefghijklmnopqrstuvwzxyABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890!@#$%^&*()-=_+[];',./{}:\<>? \|";
                string cc = "";
                int p = 0;
                for (int i = 0; i < s.Length; i++)
                {
                    cc = s.Substring(i, 1);
                    if (c.IndexOf(cc) >= 0)
                        p++;
                    else
                        p = p + 2;

                    if (p + 1 > l)
                        return s.Substring(0, i) + "..";
                }
                if (r != "")
                {
                    string str = r;
                    for (int i = 0; i <= l; i++)
                    {
                        str += r;
                    }

                    return s + "  " + str.Substring(0, l - p);
                }
                else
                {
                    return s;
                }
            }

        /// <summary>
            /// 截取字符串(按全角长度,一个全角等于两个半角)
            /// </summary>
            /// <param name="str">字符串</param>
            /// <param name="length">截取长度(全角)</param>
            /// <returns></returns>
            public String InterceptString(String str, Int32 length)
            {
                if (str.Length > length)
                {
                    string newStr = "";
                    length = length * 2;
                    foreach (char ch in str)
                    {
                        if (ch >= 32 && ch <= 126)//半角
                        {
                            length--;
                        }
                        else// 全角
                        {
                            length = length - 2;
                        }

                        if (length < 0) break;
                        newStr += ch;
                    }
                    str = newStr;
                }
                return str;
            }

    转载请注明出处:http://blog.csdn.net/dasihg/article/details/6781391

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  • 原文地址:https://www.cnblogs.com/dashi/p/4034780.html
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