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using System;
 
public class Test
{
	public static void Main()
	{
		Unicode2HTML("峯");
	}
 
	private string Unicode2HTML(string unc)
 {
     StringBuilder sb = new StringBuilder();
     //以;將文字拆成陣列
     string[] tmp = unc.Split(';');
     //檢查最後一個字元是否為【;】，因為有【英文】、【阿拉伯數字】、【&#XXXX;】
     //若最後一個要處理的字並非HTML UNICODE則不進行處理
     bool Process_last = unc.Substring(unc.Length - 1, 1).Equals(";");
     //Debug.WriteLine(tmp.Length + "");
    for (int i = 0; i < tmp.Length; i++)
    {
        //以&#將文字拆成陣列
        string[] tmp2 = tmp[i].Split(new string[] { "&#" }, StringSplitOptions.RemoveEmptyEntries);
        if (tmp2.Length == 1)
        {
            //如果長度為1則試圖轉換UNICODE回字符，若失敗則使用原本的字元
            if (i != tmp.Length - 1)
            {
                try
             {
                    sb.Append(Convert.ToChar(Convert.ToInt32(int.Parse(tmp2[0]))).ToString());
               }
                catch
              {
                    sb.Append(tmp2[0]);
               }
            }
            else
            {
               sb.Append(tmp2[0]);
           }
       }
        if (tmp2.Length == 2)
        {
            //若長度為2，則第一項不處理，只處理第二項即可
            sb.Append(tmp2[0]);
           sb.Append(Convert.ToChar(Convert.ToInt32(int.Parse(tmp2[1]))).ToString());
        }
    }
 
 
  return sb.ToString();
}
}

prog.cs(7,3): error CS0120: An object reference is required to access non-static member `Test.Unicode2HTML(string)'
prog.cs(12,6): error CS0246: The type or namespace name `StringBuilder' could not be found. Are you missing `System.Text' using directive?
prog.cs(30,21): error CS0841: A local variable `sb' cannot be used before it is declared
prog.cs(34,21): error CS0841: A local variable `sb' cannot be used before it is declared
prog.cs(39,16): error CS0841: A local variable `sb' cannot be used before it is declared
prog.cs(45,13): error CS0841: A local variable `sb' cannot be used before it is declared
prog.cs(46,12): error CS0841: A local variable `sb' cannot be used before it is declared
prog.cs(51,10): error CS0841: A local variable `sb' cannot be used before it is declared
Compilation failed: 8 error(s), 0 warnings

Standard output is empty