WinForm中使用自定义Tooltip控件

• private ToolTip tooltipCtr;
• 构造函数中：
  • 隐藏默认的Tooltip：this.ShowCellToolTips = false;
  • this.tooltipCtr = new ToolTip();
  • 设置停留时间（还有许多其他时间设置）：this.tooltipCtr.AutoPopDelay = 1000 * 60;
  • 在CellMouseEnterHandler等事件中设置数据，在鼠标处设置文本：tooltipCtr.Show(HttpUtility.HtmlDecode(((BasicData)this.Rows[rowIndex].DataBoundItem).VarDescLong), this, PointToClient(MousePosition));
  • 限制宽度/每行字符数（自动换行）

    •          private const int maximumSingleLineTooltipLength = ;
      
               private static string AddNewLinesForTooltip(string text)
               {
                   if (text.Length < maximumSingleLineTooltipLength)
                       return text;
      
                   StringBuilder sb = new StringBuilder();
      
                   int currentLinePosition = ;
                   for (int textIndex = ; textIndex < text.Length; textIndex++)
                   {
                       sb.Append(text[textIndex]);
      
                       // if reach the original new line in the text
                       // just recount
                       if (text[textIndex].Equals(Environment.NewLine)
                           || (text[textIndex].Equals('\n') && textIndex >=  && text[textIndex - ].Equals('\r')))
                       {
                           currentLinePosition = ;
                           continue;
                       }
      
                       // If we have reached the target line length
                       // and the nextcharacter is whitespace
                       // and don't break \r\n
                       // then begin a new line.
                       if (currentLinePosition >= maximumSingleLineTooltipLength
                           && char.IsWhiteSpace(text[textIndex])
                           && !(text[textIndex].Equals('\r') && textIndex < text.Length && text[textIndex + ].Equals('\n')))
                       {
                           sb.Append(Environment.NewLine);
                           currentLinePosition = ;
                           continue;
                       }
      
                       // Append the next character.
                       if (textIndex < text.Length)
                       {
                           currentLinePosition++;
                       }
                   }
      
                   return sb.ToString();
               }