/// <summary>
/// Iterates a control and its children controls, ensuring they are all LiteralControls
/// <remarks>
/// Only LiteralControl can call RenderControl(System.Web.UI.HTMLTextWriter htmlWriter) method. Otherwise
/// a runtime error will occur. This is the reason why this method exists.
/// </remarks>
/// </summary>
/// <param name="control">The control to be cleared and verified</param>
private void RecursiveClear(Control control)
{
//Clears children controls
for (int i = control.Controls.Count - 1; i >= 0; i--)
{
RecursiveClear(control.Controls[i]);
}
string columnName = string.Empty;
Object controlTemp = (object)control;
if (control.Parent is DataControlFieldCell)
{
columnName = ((DataControlFieldCell)control.Parent).ContainingField.HeaderText;
}
ExcelFormatEventArgs args = new ExcelFormatEventArgs();
args.ColumnName = columnName;
args.Control = control;
if (args.Cancel) return;
OnBeforeFormat(args);
if (control is Repeater)
{
control.Parent.Controls.Remove(control);
}
//If it is a LinkButton, convert it to a LiteralControl
else if (control is LinkButton)
{
LiteralControl literal = new LiteralControl();
control.Parent.Controls.Add(literal);
literal.Text = ((LinkButton)control).Text;
control.Parent.Controls.Remove(control);
}
//We don't need a button in the excel sheet, so simply delete it
else if (control is Button)
{
control.Parent.Controls.Remove(control);
}
// Replace image with 'o' char
else if (control is Image)
{
if (((Image)control).Visible)
{
control.Parent.Controls.Add(new LiteralControl("<span style='font-size:8px;'>o</span>"));
}
control.Parent.Controls.Remove(control);
}
//If it is a ListControl, copy the text to a new LiteralControl
else if (control is ListControl)
{
LiteralControl literal = new LiteralControl();
control.Parent.Controls.Add(literal);
try
{
literal.Text = ((ListControl)control).SelectedItem.Text;
}
catch
{
}
control.Parent.Controls.Remove(control);
}
//If it is a Hyperlink, convert it to a LiteralControl
else if (control is HyperLink)
{
LiteralControl literal = new LiteralControl();
control.Parent.Controls.Add(literal);
literal.Text = ((HyperLink)control).Text;
control.Parent.Controls.Remove(control);
}
//You may add more conditions when necessary
Object controlTemp1 = (object)control;
args.Formatted = controlTemp.Equals(controlTemp1);
OnAfterFormat(args);
return;
}
/// <summary>
/// Called when a control is in the scope to be formated
/// </summary>
/// <param name="e">The ExcelFormatEventArgs instance containing the event data.</param>
protected virtual void OnAfterFormat(ExcelFormatEventArgs e)
{
if (null != AfterFormat)
{
AfterFormat(this, e);
}
}
/// <summary>
/// Occures before control is formatted
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void exp_BeforeFormat(object sender, ExcelFormatEventArgs e)
{
if (ExcelBeforeFormat != null) ExcelBeforeFormat(sender, e);
}
/// <summary>
/// Called when a control is in the scope to be formated
/// </summary>
/// <param name="e">The ExcelFormatEventArgs instance containing the event data.</param>
protected virtual void OnBeforeFormat(ExcelFormatEventArgs e)
{
if (null != BeforeFormat)
{
BeforeFormat(this, e);
}
}
/// <summary>
/// Occures after control is formatted
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void exp_AfterFormat(object sender, ExcelFormatEventArgs e)
{
if (ExcelAfterFormat != null) ExcelAfterFormat(sender, e);
}