Block.Margin 属性

定义

命名空间:

System.Windows.Documents

程序集:

PresentationFramework.dll

获取或设置元素的边距粗细。

public:
 property System::Windows::Thickness Margin { System::Windows::Thickness get(); void set(System::Windows::Thickness value); };

public System.Windows.Thickness Margin { get; set; }

member this.Margin : System.Windows.Thickness with get, set

Public Property Margin As Thickness

属性值

Thickness

一个 Thickness 结构，指定要应用的边距量（以与设备无关的像素为单位）。 默认为统一粗细，即零 (0.0)。

示例

以下示例演示如何设置Margin元素 () Paragraph 的属性Block。

<FlowDocument Background="LightSlateGray" ColumnWidth="2000">
  <Section Background="DarkMagenta" Margin="0" Padding="0">
    <Paragraph Background="White">
      <Run>Default paragraph.</Run>
    </Paragraph>
    <Paragraph Background="White">
      <Run>Default paragraph.</Run>
    </Paragraph>
    <Paragraph Background="LightBlue" Margin="50">
      <Run>This paragraph has a magin of 50 pixels set, but no padding.</Run>
    </Paragraph>
    <Paragraph Background="LightCoral" Padding="50">
      <Run>This paragraph has padding of 50 pixels set, but no margin.</Run>
    </Paragraph>
    <Paragraph Background="LightGreen" Margin="50" Padding="50">
      <Run>This paragraph has both padding and margin set to 50 pixels.</Run>
    </Paragraph>
    <Paragraph Background="White">
      <Run>Default paragraph.</Run>
    </Paragraph>
    <Paragraph Background="White">
      <Run>Default paragraph.</Run>
    </Paragraph>
  </Section>
</FlowDocument>

下图显示了上述示例的呈现方式。 夸张的粗细和颜色用于插图。

以下示例演示如何以编程方式设置 Margin 属性。

FlowDocument flowDoc = new FlowDocument();
Section sec = new Section();

flowDoc.Background = Brushes.LightSlateGray;
flowDoc.ColumnWidth = 2000;
sec.Background = Brushes.DarkMagenta;
sec.Padding = sec.Margin = new Thickness(0);

Paragraph defPar1 = new Paragraph(new Run("Default paragraph."));
Paragraph defPar2 = new Paragraph(new Run("Default paragraph."));
Paragraph defPar3 = new Paragraph(new Run("Default paragraph."));
Paragraph defPar4 = new Paragraph(new Run("Default paragraph."));
defPar1.Background = defPar2.Background = defPar3.Background = defPar4.Background = Brushes.White;

Paragraph marginPar = new Paragraph(new Run("This paragraph has a magin of 50 pixels set, but no padding."));
marginPar.Background = Brushes.LightBlue;
marginPar.Margin = new Thickness(50);
Paragraph paddingPar = new Paragraph(new Run("This paragraph has padding of 50 pixels set, but no margin."));
paddingPar.Background = Brushes.LightCoral;
paddingPar.Padding = new Thickness(50);
Paragraph marginPaddingPar = new Paragraph(new Run("This paragraph has both padding and margin set to 50 pixels."));
marginPaddingPar.Background = Brushes.LightGreen;
marginPaddingPar.Padding = marginPaddingPar.Margin = new Thickness(50);

sec.Blocks.Add(defPar1);
sec.Blocks.Add(defPar2);
sec.Blocks.Add(marginPar);
sec.Blocks.Add(paddingPar);
sec.Blocks.Add(marginPaddingPar);
sec.Blocks.Add(defPar3);
sec.Blocks.Add(defPar4);
flowDoc.Blocks.Add(sec);

Dim flowDoc As New FlowDocument()
Dim sec As New Section()

flowDoc.Background = Brushes.LightSlateGray
flowDoc.ColumnWidth = 2000
sec.Background = Brushes.DarkMagenta
sec.Margin = New Thickness(0)
sec.Padding = sec.Margin

Dim defPar1 As New Paragraph(New Run("Default paragraph."))
Dim defPar2 As New Paragraph(New Run("Default paragraph."))
Dim defPar3 As New Paragraph(New Run("Default paragraph."))
Dim defPar4 As New Paragraph(New Run("Default paragraph."))
defPar4.Background = Brushes.White
defPar3.Background = defPar4.Background
defPar2.Background = defPar3.Background
defPar1.Background = defPar2.Background

Dim marginPar As New Paragraph(New Run("This paragraph has a magin of 50 pixels set, but no padding."))
marginPar.Background = Brushes.LightBlue
marginPar.Margin = New Thickness(50)
Dim paddingPar As New Paragraph(New Run("This paragraph has padding of 50 pixels set, but no margin."))
paddingPar.Background = Brushes.LightCoral
paddingPar.Padding = New Thickness(50)
Dim marginPaddingPar As New Paragraph(New Run("This paragraph has both padding and margin set to 50 pixels."))
With marginPaddingPar
    .Background = Brushes.LightGreen
    .Margin = New Thickness(50)
    .Padding = marginPaddingPar.Margin
End With

sec.Blocks.Add(defPar1)
sec.Blocks.Add(defPar2)
sec.Blocks.Add(marginPar)
sec.Blocks.Add(paddingPar)
sec.Blocks.Add(marginPaddingPar)
sec.Blocks.Add(defPar3)
sec.Blocks.Add(defPar4)
flowDoc.Blocks.Add(sec)

注解

Margin 是位于元素内容区域的缓冲区空间，位于元素内容区域的边缘和父元素的边缘之间。 与 Padding位于元素的内容区域之间的缓冲区空间与元素的内部边缘之间的缓冲区空间形成对比。

XAML 属性用法

<object Margin="uniformThickness"/>  
- or -  
<object Margin="independentThickness"/>  
- or -  
<object Margin="qualifiedUniformThickness"/>  
- or -  
<object Margin="qualifiedIndependentThickness"/>  

XAML 值

uniformThickness
单个 Double 值的字符串表示形式，以统一应用于所有四个粗细尺寸。 例如，值 "10" 等效于值 "10,10,10,10"。 不限定的值以独立于设备的像素进行度量。 字符串不需要显式包含小数点。

independentThickness
按此顺序表示四个有序 Double 值，对应于左、上、右和下的独立粗细尺寸。 四个值必须用逗号分隔;不允许空格。 例如，“5，10，15，20”在内容左侧产生 5 像素的边距，内容上方的边距为 10 像素，内容右侧的边距为 15 像素，内容下方有 20 像素的边距。

qualifiedUniformThickness
由 uniformThickness 描述的值，后跟以下单位说明符之一： px``in

px (默认) 与设备无关的单位 (每单位 1/96 英寸)

in 为英寸;1in==96px

例如， "1in" 在所有方向上提供 1 英寸的统一边距。

qualifiedIndependentThickness
由 independentThickness 描述的值，每个独立值后跟以下单位说明符之一： px``in

px (默认) 与设备无关的单位 (每单位 1/96 英寸)

in 为英寸;1in==96px

例如，"1.5in,0.8in,1.5in,0.8in"。 单元说明符可以混合或省略一个或多个值。

依赖项属性信息

标识符字段	MarginProperty
元数据属性设置为 true	AffectsMeasure

另请参阅

• Padding