HtmlTextWriter.GetStyleKey Method
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. public override void RenderBeginTag(HtmlTextWriterTag tagKey) { // 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 this custom MarkupTextWriter // includes functionality for all other markup elements. base.RenderBeginTag(tagKey); }
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
