Here is an example from MSDN:
It is the simple and handy method but has a few flaws.
1. Output is far from optimal. For example, following code that adds a border
It has no matter if you don't pay attention to the size of pages you develop, but it is taken into consideration if you take into consideration your visitor's needs (sorry for tautology). But it's a trifle, of course. I mentioned it just for completeness. There is a more serious flaw.
2. Number of style attributes that can be registered in such way is very limited. You can't add padding or margin attributes or even particular border (e.g. border-left).
TypeName is the fully qualified name of the
Source code - 1kB
// Create a Style object for the section of the Web page.
Style bodyStyle = new Style();
bodyStyle.ForeColor = System.Drawing.Color.Blue;
bodyStyle.BackColor = System.Drawing.Color.LightGray;
// Add the style to the header of the current page.
Page.Header.StyleSheet.CreateStyleRule(bodyStyle, this, "BODY");
It is the simple and handy method but has a few flaws.
1. Output is far from optimal. For example, following code that adds a border
someStyle.BorderColor = System.Drawing.Color.Red;produces this output
someStyle.BorderStyle = BorderStyle.Solid;
someStyle.BorderWidth = new Unit("1px");
border-color:Red;border-width:1px;border-style:Solid;instead of
border:Solid 1px Red;
It has no matter if you don't pay attention to the size of pages you develop, but it is taken into consideration if you take into consideration your visitor's needs (sorry for tautology). But it's a trifle, of course. I mentioned it just for completeness. There is a more serious flaw.
2. Number of style attributes that can be registered in such way is very limited. You can't add padding or margin attributes or even particular border (e.g. border-left).
The code overview
Class StylesController has four public static methods://includes registered styles into page headerThe class StylesController implements IHttpHandler interface and serves as HttpHandler that produces the stylesheet file.
public static void RegisterStyleSheetBlock(Page page, string key, string styles)
{
LiteralControl ctrl = new LiteralControl(string.Format(@"<style type=""text/css"">
{0}
</style>", styles));
ctrl.ID = key;
page.Header.Controls.Add(ctrl);
}
//includes link to the newly created stylesheet file into page header
public static void RegisterStyleSheetInclude(Page page, string key, string styles)
{
byte[] bytes = System.Text.Encoding.UTF8.GetBytes(key);
string base64Key = Convert.ToBase64String(bytes).Replace('+', '!');
LiteralControl ctrl = new LiteralControl(string.Format(@"<link
type=""text/css"" rel=""stylesheet"" href=""{0}?key={1}""/>",
page.ResolveUrl("~/stylesheet.css"),
base64Key));
ctrl.ID = key;
page.Header.Controls.Add(ctrl);
HttpContext.Current.Session[base64Key] = styles;
}
//checks whether inline styles with specified key have been already registered
public static bool IsStyleSheetBlockRegistered(Page page, string key)
{
return (page.Header.FindControl(key) != null);
}
//checks whether a file with styles with specified key have been already registered
public static bool IsStyleSheetIncludeRegistered(Page page, string key)
{
return (page.Header.FindControl(key) != null);
}
public class StylesController : IHttpHandler, System.Web.SessionState.IRequiresSessionStateHttpHandler has to be registered in web.config
{
...
#region IHttpHandler Members
bool IHttpHandler.IsReusable
{
get { return false; }
}
void IHttpHandler.ProcessRequest(HttpContext context)
{
context.Response.Clear();
context.Response.ContentType = "text/css";
string key = context.Request["key"];
if (key != null)
{
object script = context.Session[key];
if (script != null)
{
context.Response.Write(script.ToString());
HttpContext.Current.Session.Remove(key);
}
}
context.Response.End();
}
#endregion
}
<httpHandlers>where AssemblyName is the name of the assembly, where the class StylesController is located,
<add verb="GET" path="StyleSheet.css" type="TypeName, AssemblyName"/>
</httpHandlers>
TypeName is the fully qualified name of the
StylesController
, including the namespace.How to use
string styles = "div{padding:2px 5px;background-color:red;}";or
if (!StylesController.IsStyleSheetBlockRegistered(this, "Red Divs"))
StylesController.RegisterStyleSheetBlock(this, "Red Divs", styles);
string styles2 = "a,a:link {text-decoration:none;background-image:url(img/back.gif);}";
if (!StylesController.IsStyleSheetIncludeRegistered(this, "New Links"))
StylesController.RegisterStyleSheetInclude(this, "New Links", styles2);
Source code - 1kB
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