GeneratorPosition 結構

定義

命名空間:

System.Windows.Controls.Primitives

組件:

PresentationFramework.dll

GeneratorPosition 可用來描述由 ItemContainerGenerator 管理之項目的位置。

public value class GeneratorPosition

public struct GeneratorPosition

type GeneratorPosition = struct

Public Structure GeneratorPosition

繼承

Object

ValueType

GeneratorPosition

範例

下列範例說明如何使用 GeneratorPosition ，從專案清單開頭開始向前產生。

// Start generating items forward from the beginning of the item list
GeneratorPosition position = new GeneratorPosition(-1, 0);
GeneratorDirection direction = GeneratorDirection.Forward;
IItemContainerGenerator generator = (IItemContainerGenerator)this.itemsControl.ItemContainerGenerator;
generator.StartAt(position, direction);

' Start generating items forward from the beginning of the item list
Dim position As New GeneratorPosition(-1, 0)
Dim direction As GeneratorDirection = GeneratorDirection.Forward
Dim generator As IItemContainerGenerator = CType(Me.itemsControl.ItemContainerGenerator, IItemContainerGenerator)
generator.StartAt(position, direction)

下列範例說明如何使用 GeneratorPosition 來開始從專案清單結尾向後產生。

// Start generating items backward from the end of the item list
GeneratorPosition position = new GeneratorPosition(-1, 0);
GeneratorDirection direction = GeneratorDirection.Backward;
IItemContainerGenerator generator = (IItemContainerGenerator)this.itemsControl.ItemContainerGenerator;
generator.StartAt(position, direction);

' Start generating items backward from the end of the item list
Dim position As New GeneratorPosition(-1, 0)
Dim direction As GeneratorDirection = GeneratorDirection.Backward
Dim generator As IItemContainerGenerator = CType(Me.itemsControl.ItemContainerGenerator, IItemContainerGenerator)
generator.StartAt(position, direction)

下列範例說明如何使用 GeneratorPosition ，從專案清單中間開始向前產生。

// Start generating items forward,
// starting with the first unrealized item (offset of 1),
// after the 5th realized item
// (the item with index 4 among all realized items) in the list
GeneratorPosition position = new GeneratorPosition(4, 1);
GeneratorDirection direction = GeneratorDirection.Forward;
IItemContainerGenerator generator = (IItemContainerGenerator)this.itemsControl.ItemContainerGenerator;
generator.StartAt(position, direction);

' Start generating items forward,
' starting with the first unrealized item (offset of 1),
' after the 5th realized item
' (the item with index 4 among all realized items) in the list
Dim position As New GeneratorPosition(4, 1)
Dim direction As GeneratorDirection = GeneratorDirection.Forward
Dim generator As IItemContainerGenerator = CType(Me.itemsControl.ItemContainerGenerator, IItemContainerGenerator)
generator.StartAt(position, direction)

備註

GeneratorPosition 可由 StartAt 使用。

建構函式

GeneratorPosition(Int32, Int32)

使用指定的索引和位移，初始化 GeneratorPosition 的新執行個體。

屬性

Index	取得或設定與產生的 (實現的) 項目相關的 Int32 索引。
Offset	取得或設定與索引項目附近之未產生的 (未實現的) 項目相關的 Int32 位移。

方法

Equals(Object)	比較指定執行個體與目前 GeneratorPosition 執行個體的值是否相等。
GetHashCode()	傳回這個 GeneratorPosition 的雜湊程式碼。
ToString()	傳回這個 GeneratorPosition 之執行個體的字串表示。

運算子

Equality(GeneratorPosition, GeneratorPosition)	比較兩個 GeneratorPosition 物件的值是否相等。
Inequality(GeneratorPosition, GeneratorPosition)	比較兩個 GeneratorPosition 物件的值是否不相等。