HtmlTextWriter::GetStyleKey Method (String^)
Obtains the HtmlTextWriterStyle enumeration value for the specified style.
Assembly: System.Web (in System.Web.dll)
Parameters
- styleName
-
Type:
System::String^
The style attribute for which to obtain the HtmlTextWriterStyle.
Return Value
Type: System.Web.UI::HtmlTextWriterStyleThe HtmlTextWriterStyle enumeration value corresponding to styleName.
The GetStyleKey method returns the value -1 typed as a HtmlTextWriterStyle value, if styleName does not correspond to any HtmlTextWriterStyle enumeration value.
The following code example demonstrates how to override the RenderBeginTag method in a class derived from the HtmlTextWriter class. The RenderBeginTag override determines whether a <label> markup will be rendered, and, if so, checks the element for a Color attribute. If a Color attribute has not been defined, the GetStyleKey method is used as the first parameter in a call to the AddStyleAttribute method to add a Color attribute to a <label> markup element and set the Color attribute to red.
// Override the RenderBeginTag method to check whether // the tagKey parameter is set to a <label> element // or a <font> element. virtual void RenderBeginTag( HtmlTextWriterTag tagKey ) override { // If the tagKey parameter is set to a <label> element // but a color attribute is not defined on the element, // the AddStyleAttribute method adds a color attribute // and sets it to red. if ( tagKey == HtmlTextWriterTag::Label ) { if ( !IsStyleAttributeDefined( HtmlTextWriterStyle::Color ) ) { AddStyleAttribute( GetStyleKey( "color" ), "red" ); } } // If the tagKey parameter is set to a <font> element // but a size attribute is not defined on the element, // the AddStyleAttribute method adds a size attribute // and sets it to 30 point. if ( tagKey == HtmlTextWriterTag::Font ) { if ( !IsAttributeDefined( HtmlTextWriterAttribute::Size ) ) { AddAttribute( GetAttributeKey( "size" ), "30pt" ); } } // Call the base class's RenderBeginTag method // to ensure that calling this custom markup writer // includes functionality for all other elements. __super::RenderBeginTag( tagKey ); }
Available since 1.1