1. This code is the main body of processing overly long strings;
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.The function of AdjustTextForDisplay(string,int,DataGrid) function is to intercept the string that is too long according to the width of the column;
What needs to be noted here is that the Font and Columns[colIndex].ItemStyle.Width properties of DataGrid must be assigned values. If no value is assigned, the function will use the system default value. If not handled, the function will throw an exception.
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;
}