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[DataGird]如何截取过长的字符串

点击次数:18 次 发布日期:2008-11-27 02:19:08 作者:源代码网
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    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;}



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