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字符串处理相关函数

 

using System;
using System.Collections.Generic;
using System.Text;

namespace NcZerg
{
    /// <summary>
    /// 字符串操作函数
    /// </summary>
    public class StringHandle
    {
        /// <summary>
        /// 截取字符串并且关键字颜色显示
        /// </summary>
        /// <param name="StringValue">输入字符串</param>
        /// <param name="HighValues">关键字</param>
        /// <param name="Len">显示长度</param>
        /// <returns></returns>
        public string Highline(String StringValue, String[] HighValues, int Len)
        {
            if (StringValue == String.Empty) return String.Empty;
            List<int> BeforePositions = new List<int>();
            List<int> AfterPositions = new List<int>();
            String BeforeStr = "<font color=\"red\">";
            String AfterStr = "</font>";
            String StringPad = "";
            String[] SplitValues;
            int before, after;
            for (int i = 0; i < HighValues.Length; i++)
            {
                if (HighValues[i] == String.Empty) continue;
                SplitValues = StringValue.Split(new string[] { HighValues[i] }, StringSplitOptions.None);
                if (SplitValues.Length == 1) continue;
                for (int j = 1; j < SplitValues.Length; j++)
                {
                    before = after = 0;
                    for (int k = 0; k < j; k++)
                    {
                        before += SplitValues[k].Length;
                        after += SplitValues[k].Length;
                    }
                    before += (j - 1) * HighValues[i].Length;
                    after += j * HighValues[i].Length;

                    BeforePositions.Add(before);
                    AfterPositions.Add(after);
                }
            }

            BeforePositions.Sort();
            AfterPositions.Sort();
            StringValue = InterceptString(StringValue, Len);
            int AddLen = 0;
            for (int i = 0; i < BeforePositions.Count; i++)
            {
                if (i > 0 && BeforePositions[i] < AfterPositions[i - 1])
                {
                    continue;
                }

                if ((StringValue.EndsWith(StringPad) && StringValue.Length - 3 >= BeforePositions[i] + AddLen)
                    || (!StringValue.EndsWith(StringPad) && StringValue.Length >= BeforePositions[i] + AddLen))
                {
                    StringValue = StringValue.Insert(BeforePositions[i] + AddLen, BeforeStr);
                    AddLen += BeforeStr.Length;

                    if ((StringValue.EndsWith(StringPad) && StringValue.Length - 3 >= AfterPositions[i] + AddLen)
                    || (!StringValue.EndsWith(StringPad) && StringValue.Length >= AfterPositions[i] + AddLen))
                    {
                        StringValue = StringValue.Insert(AfterPositions[i] + AddLen, AfterStr);
                        AddLen += AfterStr.Length;
                    }
                    else
                    {
                        StringValue += AfterStr;
                        break;
                    }
                }
            }
            if (StringValue.LastIndexOf(BeforeStr) > StringValue.LastIndexOf(AfterStr))
            {
                StringValue += AfterStr;
            }
            return StringValue;
        }

        /// <summary>
        /// 截取字符串函数
        /// </summary>
        /// <param name="Str">输入字符串</param>
        /// <param name="Len">截取长度</param>
        /// <returns></returns>
        private String InterceptString(String StringValue, int Len)
        {
            String Res = String.Empty;
            String StringPad = "";
            int Sum = 0;
            if (getStringLen(StringValue) <= Len)
            {
                return StringValue;
            }
            else
            {///截取左边 Str 第 Len - 3 个字符串返回
                for (int i = 0; i < StringValue.Length; i++)
                {
                    if (Sum >= Len - 3)
                    {
                        break;
                    }
                    if (((int)(StringValue[i])) > 126)
                    { ///是汉字 Sum += 2
                        Sum += 2;
                        if (Sum > Len - 3)
                        {
                            break;
                        }
                    }
                    else
                    {
                        Sum++;
                    }

                    Res += StringValue[i].ToString();
                }

                Res += StringPad;
            }

            return Res;
        }

        /// <summary>
        /// 获取字符串长度函数
        /// </summary>
        /// <param name="Str"></param>
        /// <returns></returns>
        public int getStringLen(String StringValue)
        {
            int sum = 0;
            foreach (char c in StringValue)
            {
                if (((int)(c)) > 126)
                {
                    sum++;
                }
                sum++;
            }
            return sum;
        }

    }
}

posted on 2007-12-20 12:08 白开心 阅读(362) 评论(0)  编辑 收藏 引用 所属分类: .Net（学习ing...）
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