字符串處理 筆記

  字符串處理 筆記

 

#region 輸出字符串
    /// <summary>
    /// 返回於編輯的字符串並進行html解碼
    /// </summary>
    /// <param name="instr">要輸出的字符串</param>
    /// <returns></returns>
    public static string OutString(string instr)
    {
        instr = HttpContext.Current.Server.HtmlDecode(instr);
        instr = instr.Replace("<br />" + Environment.NewLine, Environment.NewLine);
        return instr;
    }

    /// <summary>
    /// 返回用於顯示的字符串並刪除超過限定字數的字符
    /// </summary>
    /// <param name="instr">要輸出的文本</param>
    /// <param name="wordCount">要輸出的字數</param>
    /// <returns></returns>
    public static string OutString(string instr, int wordCount)
    {
        byte[] mybyte = System.Text.Encoding.Default.GetBytes(instr);
        if (mybyte.Length > wordCount)
        {
            outstr = new StringBuilder();
            for (int i; i < instr.Length; i++)
            {
                byte[] tempByte = System.Text.Encoding.Default.GetBytes(outstr.ToString());
                if (tempByte.Length < wordCount * 2)
                {
                    outstr.Append(instr.Substring(i, 1));
                }
                else
                {
                    break;
                }
            }
            return outstr.ToString();
        }
        else
        {
            return instr;
        }
    }
    /// <summary>
    /// 返回用於顯示的字符串並用省略號代替超過限定字數的字符
    /// </summary>
    /// <param name="instr">要輸出的文本</param>
    /// <param name="WordCount">要輸出的字數</param>
    /// <param name="Prolong">要代替的符號</param>
    /// <returns></returns>
    public static string OutString(string instr, int WordCount, bool Prolong)
    {
        byte[] mybyte = System.Text.Encoding.Default.GetBytes(instr);
        if (mybyte.Length > WordCount)
        {
            outstr = new StringBuilder();
            for (int i = 0; i < instr.Length; i++)
            {
                byte[] tempByte = System.Text.Encoding.Default.GetBytes(outstr.ToString());
                if (tempByte.Length < WordCount * 2)
                {
                    outstr.Append(instr.Substring(i, 1));
                }
                else
                {
                    if (Prolong)
                    {
                        outstr.Append("...");
                    }
                    break;
                }
            }
            return outstr.ToString();
        }
        else
        {
            return instr;
        }
    }

    #endregion