Adding StyleSheets Programmatically in Asp.Net

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I want to add StyleSheets programmatically in the head section but one of the examples I saw seemed to need to many lines of code to add just one style sheet even though I m

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闹比i

2020-12-03 14:07
I define a generic HTML <link> and set the href attribute programmatically.

For example, in the page <head> I have:
```
<link id="cssStyle" runat="server" rel="stylesheet" type="text/css" />.
```
Then in Page_Load set the Href property of cssStyle:
```
cssStyle.Href = "path/to/Styles.css";
```
Seems a bit cleaner with the upside of having the design control over placing the <link> in the desired order.
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春和景丽

2020-12-03 14:10

I'll paste the thing which worked for me:

HtmlLink link = new HtmlLink();
//Add appropriate attributes
link.Attributes.Add("rel", "stylesheet");
link.Attributes.Add("type", "text/css");
link.Href = "/Resources/CSS/NewStyles.css";
link.Attributes.Add("media", "screen, projection");
//add it to page head section
this.Page.Header.Controls.Add(link);

Even I searched a lot on this, I'd to add a overriding style sheet when a button is clicked. I used the above code and it worked perfectly to me.

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挽巷

2020-12-03 14:14
I went a step over, I wanted a method that makes me impossible to add include duplicates, something like ClientScriptManager.RegisterClientScriptInclude(). The solution is to give an ID to the control added in the Header section.
```
if (!String.IsNullOrEmpty(Key))
     if (Page.Header.FindControl(Key) != null) return;

HtmlLink link = new HtmlLink();
if (!String.IsNullOrEmpty(Key)) link.ID = Key;
link.Href = StyleUrl; 
link.Attributes.Add("type", "text/css"); 
link.Attributes.Add("rel", "stylesheet");
Page.Header.Controls.Add(link);
```
For the complete article I wrote: http://www.idea-r.it/Blog.aspx?Article=49
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一整个雨季

2020-12-03 14:15

Okay, here is the solution I am currently using :

I created a helper class :

using System.Web.UI;
using System.Web.UI.WebControls;

namespace BusinessLogic.Helper
{
    public class CssAdder
    {
        public static void AddCss(string path, Page page)
        {
            Literal cssFile = new Literal() { Text = @"<link href=""" + page.ResolveUrl(path) + @""" type=""text/css"" rel=""stylesheet"" />" };
            page.Header.Controls.Add(cssFile);
        }
    }
}

and then through this helper class, all I have to do is :

CssAdder.AddCss("~/Resources/Styles/MainMaster/MainDesign.css", this.Page);
CssAdder.AddCss("~/Resources/Styles/MainMaster/MainLayout.css", this.Page);
CssAdder.AddCss("~/Resources/Styles/Controls/RightMainMenu.css", this.Page);
//...

So I can add as much as I want with one line of simple code.

It also works with Masterpage and content page relationships.

Hope it helps.

P.S: I don't know the performance difference between this and other solutions but it looks more elegant and easy to consume.

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