HtmlTextWriter.NewLine 属性

定义

命名空间:

System.Web.UI

程序集:

System.Web.dll

获取或设置 HtmlTextWriter 对象使用的行结束符字符串。

public:
 virtual property System::String ^ NewLine { System::String ^ get(); void set(System::String ^ value); };

public override string NewLine { get; set; }

member this.NewLine : string with get, set

Public Overrides Property NewLine As String

属性值

String

由当前 HtmlTextWriter 使用的行结束符字符串。

示例

下面的代码示例演示如何使用从 HtmlTextWriter 类派生的自定义类替代 FilterAttributes 该方法。 调用时，重写将 FilterAttributes 检查文本编写器是否呈现任何 <label> 元素或 <a> 元素。 如果是，此方法 FilterAttributes 确定是否为标签定义了样式属性。 如果未定义样式，该方法 FilterAttributes 会将 style:color 属性的默认值设置为蓝色。 然后，NewLine该方法FilterAttributes使用属性在标记标记中插入换行符，并写入任何其他定义的属性。

// Override the FilterAttributes method to check whether 
// <label> and <anchor> elements contain specific attributes. 
virtual void FilterAttributes() override
{
   // If the <label> element is rendered and a style
   // attribute is not defined, add a style attribute 
   // and set its value to blue.
   if ( TagKey == HtmlTextWriterTag::Label )
   {
      if (  !IsAttributeDefined( HtmlTextWriterAttribute::Style ) )
      {
         AddAttribute( "style", EncodeAttributeValue( "color:blue", true ) );
         Write( NewLine );
         Indent = 3;
         OutputTabs();
      }
   }

   // If an <anchor> element is rendered and an href
   // attribute has not been defined, call the AddAttribute
   // method to add an href attribute
   // and set it to http://www.cohowinery.com.
   // Use the EncodeUrl method to convert any spaces to %20.
   if ( TagKey == HtmlTextWriterTag::A )
   {
      if (  !IsAttributeDefined( HtmlTextWriterAttribute::Href ) )
      {
         AddAttribute( "href", EncodeUrl( "http://www.cohowinery.com" ) );
      }
   }

   // Call the FilterAttributes method of the base class.
   __super::FilterAttributes();
}

// Override the FilterAttributes method to check whether 
// <label> and <anchor> elements contain specific attributes.      
protected override void FilterAttributes()
{
    // If the <label> element is rendered and a style
    // attribute is not defined, add a style attribute 
    // and set its value to blue.
    if (TagKey == HtmlTextWriterTag.Label)
    {
        if (!IsAttributeDefined(HtmlTextWriterAttribute.Style))
        {
            AddAttribute("style", EncodeAttributeValue("color:blue", true));
            Write(NewLine);
            Indent = 3;
            OutputTabs();
        }
    }

    // If an <anchor> element is rendered and an href
    // attribute has not been defined, call the AddAttribute
    // method to add an href attribute
    // and set it to http://www.cohowinery.com.
    // Use the EncodeUrl method to convert any spaces to %20.
    if (TagKey == HtmlTextWriterTag.A)
    {
        if (!IsAttributeDefined(HtmlTextWriterAttribute.Href))
        {
            AddAttribute("href", EncodeUrl("http://www.cohowinery.com"));
        }
    }
    // Call the FilterAttributes method of the base class.
    base.FilterAttributes();
}

' Override the FilterAttributes method to check whether 
' <label> and <anchor> elements contain specific attributes.   
Protected Overrides Sub FilterAttributes()

    ' If the <label> element is rendered and a style
    ' attribute is not defined, add a style attribute 
    ' and set its value to blue.
    If TagKey = HtmlTextWriterTag.Label Then
        If Not IsAttributeDefined(HtmlTextWriterAttribute.Style) Then
            AddAttribute("style", EncodeAttributeValue("color:blue", True))
            Write(NewLine)
            Indent = 3
            OutputTabs()
        End If
    End If
    ' If an <anchor> element is rendered and an href
    ' attribute has not been defined, call the AddAttribute
    ' method to add an href attribute
    ' and set it to http://www.cohowinery.com.
    ' Use the EncodeUrl method to convert any spaces to %20.
    If TagKey = HtmlTextWriterTag.A Then
        If Not IsAttributeDefined(HtmlTextWriterAttribute.Href) Then
            AddAttribute("href", EncodeUrl("http://www.cohowinery.com"))
        End If
    End If

    ' Call the FilterAttributes method of the base class.
    MyBase.FilterAttributes()
End Sub

注解

默认行终止符字符串是回车符，后跟换行符 (“\r\n”) 。

每当调用其中一个 WriteLine 方法时，行终止符字符串将写入输出流。 NewLine如果该属性设置为 null，则使用默认的新行字符。

另请参阅

• WriteLine
• TextWriter
• NewLine