[DataGird]如何截取过长的字符串
2006-03-07 17:03:33 来源:WEB开发网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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