GridView自動改變列寬

    轉自http://blog.csdn.net/qiujiahao/archive/2007/08/09/1733347.aspx

public  void SetGridViewWidth(GridView gridview1)
        {
            int rowcount = gridview1.Rows.Count;   //行數
            int colcount = gridview1.Columns.Count;  //列數
            int i=0,j=0;
            int[] cellwidth = new int[colcount];   //數組用來儲存各個列的最大字元數
            int gridviewwidth = 0;  //GridView寬度
            Unit width = 0; 
            string temp = null;
            int tempLength = 0;

            for (i = 0; i < rowcount; i++)     //迴圈資料項目，獲得各個列的最大字元寬度
            {
                for (j = 0; j < colcount; j++)
                {
                    temp = gridview1.Rows[i].Cells[j].Text;
                    tempLength = LengthOfLetter(temp);      //LengthOfLetter()返回含中文的字串字元寬度，1個漢字2個字元寬
                    if (cellwidth[j] < tempLength)
                    {
                        cellwidth[j] = tempLength;        //儲存較大寬度值
                    }

                }
            }

          

            for (j = 0; j < colcount; j++)
            {
                if (gridview1.HeaderRow.Visible == true)      //如果GridView表頭可見，將表頭列寬參與比較                {
                    temp = gridview1.HeaderRow.Cells[j].Text;
                    tempLength = LengthOfLetter(temp);
                    if (cellwidth[j] < tempLength)
                    {
                        cellwidth[j] = tempLength;
                    }
               

                if (gridview1.FooterRow.Visible == true)    //如果GridView表尾可見，將表尾列寬參與比較                {
                    temp = gridview1.FooterRow.Cells[j].Text;
                    tempLength = LengthOfLetter(temp);
                    if (cellwidth[j] < tempLength)
                    {
                        cellwidth[j] = tempLength;
                    }
               

            }

            for (j = 0; j < colcount; j++)
            {
                if (gridview1.Columns[j].Visible == true)
                {
                    //將顯示的列的各列最大字元寬度相加                {
                    gridviewwidth += cellwidth[j];
                }
            }

            width = gridviewwidth * 5;  //GridView最大字元數乘於一個字元顯示寬度得到GridView顯示寬度
            if (gridview1.Width.Value < width.Value)    //如果在介面上已經設定了GridView的寬度，將動態求的寬度和頁面上的
               {                                                              //初始化寬度比較，如果初始化寬度較小則將寬度設定為新調整的寬度。
                     gridview1.Width = width;
                }

        }

 

       //含有中文的字串等效英文字串顯示長度

        public  int LengthOfLetter(string temp) 
        {
            int length = temp.Length;
            int newlength = temp.Length;

            for (int i = 0; i < length; i++)         //遍曆字串每個字元
            {
                if (IsChineseLetter(temp, i))     //IsChineseLetter()判斷是否為中文字元，是則寬度加1
                {
                    newlength++;
                }
            }
            return newlength;

        }

   //判斷是否為中文字元
     public  bool  IsChineseLetter(string input,int index)
        {
            int code = 0;
            int chfrom = Convert.ToInt32("4e00", 16);    //範圍（0x4e00～0x9fff）轉換成int（chfrom～chend）
            int chend = Convert.ToInt32("9fff", 16);
            if (input != "")
            {
                code = Char.ConvertToUtf32(input, index);    //獲得字串input中指定索引index處字元unicode編碼
               
               if (code >= chfrom && code <= chend)    
               {
                    return true;     //當code在中文範圍內返回true

                }
               else
               {
                     return false ;    //當code不在中文範圍內返回false
               }
            }

            return false;
        }