protected override void OnStart(TextWriter writer)
{
// Build the src
StringBuilder src = new StringBuilder("http://placehold.it/" + Width);
if (Height != null)
{
src.Append("x" + Height);
}
if (!string.IsNullOrWhiteSpace(BackgroundColor))
{
src.Append("/" + BackgroundColor.Replace("#", ""));
if (!string.IsNullOrWhiteSpace(TextColor))
{
src.Append("/" + TextColor.Replace("#", ""));
}
}
else if (!string.IsNullOrWhiteSpace(TextColor))
{
throw new InvalidOperationException("BackgroundColor must be specified if TextColor is specified.");
}
if (!string.IsNullOrWhiteSpace(Format))
{
src.Append("." + Format);
}
if (!string.IsNullOrWhiteSpace(Text))
{
src.Append("&text=" + Text.Replace(' ', '+'));
}
MergeAttribute("src", src.ToString());
base.OnStart(writer);
}
