how to add css class to html generic control div

Question

I created a div tag like this   System Web UI HtmlControls HtmlGenericControl dynDiv        new System Web UI HtmlControls HtmlGenericControl  DIV      I added style to the div tag like this   dynDiv Style Add HtmlTextWriterStyle BorderStyle   1px solid  DBE0E4    dynDiv Style Add HtmlTextWriterStyle Height   auto    dynDiv Style Add HtmlTextWriterStyle MarginTop   5px    dynDiv Style Add HtmlTextWriterStyle PaddingBottom   5px    dynDiv Style Add HtmlTextWriterStyle Width   682px      But I need to control the style of the div tag through an external css file located at folder   css maincss css   How can I apply the css in that file to this div

User · Answer

My approach would be        lt summary gt      Appends CSS Class seprated by a space character      lt  summary gt       lt param name  control  gt Target control lt  param gt       lt param name  cssClass  gt CSS class name to append lt  param gt  public static void AppendCss HtmlGenericControl control  string cssClass           Ensure CSS class is definied     if  string IsNullOrEmpty cssClass   return          Append CSS class     if  string IsNullOrEmpty control Attributes  class                      Set our CSS Class as only one         control Attributes  class     cssClass            else                  Append new CSS class with space as seprator         control Attributes  class             cssClass

User · Answer

Alternative approach if you want to add a class to an existing list of classes of an element   element Attributes  class        myCssClass

User · Answer

You don t add the css file to the div  you add a class to it then put your import at the top of the HTML page like so    lt link href     files external css  rel  stylesheet  type  text css    gt    Then add a class like the following to your code   myStyle    Then in the css file do something like    myStyle      border-style  1px solid  DBE0E4

User · Answer

To add a class to a div that is generated via the HtmlGenericControl way you can use   div1 Attributes Add  class    classname       If you are using the Panel option  it would be   panel1 CssClass    classname

User · Answer

if you want to add a class to an existing list of classes for an element   element Attributes Add  class   element Attributes  class           sType

User · Answer

dynDiv Attributes  class      myCssClass

User · Answer

How about an extension method    Here I have a show or hide method  Using my CSS class hidden    public static class HtmlControlExtensions       public static void Hide this HtmlControl ctrl                if   string IsNullOrEmpty ctrl Attributes  class                           if   ctrl Attributes  class   Contains  hidden                    ctrl Attributes Add  class   ctrl Attributes  class       hidden                      else                       ctrl Attributes Add  class    hidden                         public static void Show this HtmlControl ctrl                if   string IsNullOrEmpty ctrl Attributes  class                 if  ctrl Attributes  class   Contains  hidden                    ctrl Attributes Add  class   ctrl Attributes  class   Replace  hidden                   Then when you want to show or hide your control   myUserControl Hide           some other code  myUserControl Show

User · Answer

I think the answer of Curt is correct  however  what if you want to add a class to a div that already has a class declared in the ASP NET code   Here is my solution for that  it is a generic method so you can call it directly as this   Asp Net Div declaration    lt div id  divButtonWrapper  runat  server  class  text-center smallbutton fixPad  gt    Code to add class   divButtonWrapper AddClassToHtmlControl  nameOfYourCssClass     Generic class   public static class HtmlGenericControlExtensions       public static void AddClassToHtmlControl this HtmlGenericControl htmlGenericControl  string className                if  string IsNullOrWhiteSpace className               return           htmlGenericControl              Attributes Add  class   string Join      htmlGenericControl              Attributes  class                Split                   Except new         className                 Concat new     className                 ToArray

User · Answer

If you re going to be repeating this  might as well have an extension method      appends a string class to the html controls class attribute public static void AddClass this HtmlControl control  string newClass        if  control Attributes  class   IsNotNullAndNotEmpty                  control Attributes  class            newClass            else               control Attributes  class     newClass

[c#] how to add css class to html generic control div?

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