HtmlTextWriter.GetStyleKey(String) Methode

protected:
 System::Web::UI::HtmlTextWriterStyle GetStyleKey(System::String ^ styleName);

protected System.Web.UI.HtmlTextWriterStyle GetStyleKey(string styleName);

member this.GetStyleKey : string -> System.Web.UI.HtmlTextWriterStyle

Protected Function GetStyleKey (styleName As String) As HtmlTextWriterStyle

Parameters

Retouren

De HtmlTextWriterStyle opsommingswaarde die overeenkomt met styleName.

Voorbeelden

In het volgende codevoorbeeld ziet u hoe u de RenderBeginTag methode overschrijft in een klasse die is afgeleid van de HtmlTextWriter klasse. De RenderBeginTag onderdrukking bepaalt of een <label> markering wordt weergegeven en controleert zo ja of het element voor een Color kenmerk wordt gecontroleerd. Als een Color kenmerk niet is gedefinieerd, wordt de GetStyleKey methode gebruikt als de eerste parameter in een aanroep van de AddStyleAttribute methode om een Color kenmerk toe te voegen aan een <label> markeringselement en het Color kenmerk in te stellen op 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 );
}

// 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);
}

' Override the RenderBeginTag method to check whether
' the tagKey parameter is set to a <label> element
' or a <font> element.   
Public Overloads Overrides Sub RenderBeginTag(ByVal tagKey As HtmlTextWriterTag)
    ' 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 Then
        If Not IsStyleAttributeDefined(HtmlTextWriterStyle.Color) Then
            AddStyleAttribute(GetStyleKey("color"), "red")
        End If
    End If

    ' 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 Then
        If Not IsAttributeDefined(HtmlTextWriterAttribute.Size) Then
            AddAttribute(GetAttributeKey("size"), "30pt")
        End If
    End If

    ' Call the base class's RenderBeginTag method
    ' to ensure that this custom MarkupTextWriter
    ' includes functionality for all other markup elements.
    MyBase.RenderBeginTag(tagKey)
End Sub

Opmerkingen

De GetStyleKey methode retourneert de waarde -1 getypt als een HtmlTextWriterStyle waarde, als styleName deze niet overeenkomt met een HtmlTextWriterStyle opsommingswaarde.

Zie ook

• TextWriter
• HtmlTextWriterStyle
• AddStyleAttribute