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开发学院WEB开发ASP.NET [DataGird]如何截取过长的字符串 阅读

[DataGird]如何截取过长的字符串

 2006-03-07 17:03:33 来源:WEB开发网   
核心提示:1.这段代码是处理过长字符串的主体;void ItemDataBound(object sender, DataGridItemEventArgs e){ // Get the string to be displayed string title = GetTheString(); // Returns the up

1.这段代码是处理过长字符串的主体;
void ItemDataBound(object sender, DataGridItemEventArgs e)
{
  // Get the string to be displayed
  string title = GetTheString();

  // Returns the updated text for the specified column
  string newText = AdjustTextForDisplay(title, 1, grid);
 
  // Set the text including the tooltip when necessary
  e.Item.Cells[1].Text = newText;
}

2.AdjustTextForDisplay(string,int,DataGrid)函数的功能是根据列的宽度,截取过长的字符串;
这里需要注意的是DataGrid的Font和Columns[colIndex].ItemStyle.Width属性必需有赋值。如果没有赋值的话,函数将会采用系统默认的值。如不加处理,函数会出异常。
string AdjustTextForDisplay(string text, int colIndex, DataGrid grid)
{
  // Calculate the dimensions of the text with the current font
  SizeF textSize = MeasureString(text, grid.Font);
 
  // Compare the size with the column's width
  int colWidth = (int) grid.Columns[colIndex].ItemStyle.Width.Value;
  if(textSize.Width > colWidth)
  {
    // Get the exceeding pixels
    int delta = (int) (textSize.Width - colWidth);
 
    // Calculate the average width of the characters (apPRox)
    int avgCharWidth = (int) (textSize.Width/text.Length);
 
    // Calculate the number of chars to trim to stay in the fixed width (approx)
    int chrToTrim = (int) (delta/avgCharWidth);
 
    // Get the proper substring + the ellipsis
    // Trim 2 more chars (approx) to make room for the ellipsis
    string rawText = text.Substring(0, text.Length-(chrToTrim+2)) + "";
 
    // Format to add a tooltip
    string fmt = "{1}";
    return String.Format(fmt, text, rawText);
  }
  return text;
}

Tags:DataGird 如何 截取

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