我想知道我可以風格電網，這樣我就不需要指定如何風格的網格ColumnDefinitions在WPF
<Grid.ColumnDefinitions>
<ColumnDefinition Width="auto" SharedSizeGroup="SG1"/>
<ColumnDefinition Width="auto" SharedSizeGroup="SG2"/>
</Grid.ColumnDefinitions>
？
非常感謝！
ps：我確實嘗試在Google上搜索。但我找不到任何答案。任何人都可以從谷歌找到答案，請告訴我你用什麼關鍵字搜索？有時候我很難確定搜索關鍵字的用途。
ps2：我太懶惰了，我只是打開chrome並鍵入內容並搜索。如果沒有發現，我沒有發現任何結果並來到這裏。有沒有人會在Google上搜索，然後找不到，然後打開bing.com並搜索？什麼也找不到，然後去雅虎和搜索和搜索？.....
我相信這是不可能的，因爲您無法設置影響所有ColumnDefinition（s）的樣式。
網格不支持ControlTemplate，所以你不能用組合來完成。
我能想到的唯一的黑客就是用這兩列創建一個用戶控件並擴展網格。但那很討厭。
創建更改回調附加依賴屬性同步收集要素：（因爲它基本上是相同的RowDefinition支持略）
<Grid>
<Grid.Style>
<Style TargetType="Grid">
<Setter Property="my:GridUtils.ColumnDefinitions">
<Setter.Value>
<my:ColumnDefinitionCollection>
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="1*" />
</my:ColumnDefinitionCollection>
</Setter.Value>
</Setter>
</Style>
</Grid.Style>
<Button Content="Button" />
<Button Content="Button" Grid.Column="1" />
</Grid>
實現：
public class GridUtils
{
public static readonly DependencyProperty ColumnDefinitionsProperty =
DependencyProperty.RegisterAttached("ColumnDefinitions", typeof (ColumnDefinitionCollection),
typeof (GridUtils),
new PropertyMetadata(default(ColumnDefinitionCollection),
OnColumnDefinitionsChanged));
private static void OnColumnDefinitionsChanged(DependencyObject d, DependencyPropertyChangedEventArgs ev)
{
var grid = (Grid) d;
var oldValue = (ColumnDefinitionCollection) ev.OldValue;
var newValue = (ColumnDefinitionCollection) ev.NewValue;
grid.ColumnDefinitions.Clear();
if (newValue != null)
foreach (var cd in newValue)
grid.ColumnDefinitions.Add(cd);
}
public static void SetColumnDefinitions(Grid element, ColumnDefinitionCollection value)
{
element.SetValue(ColumnDefinitionsProperty, value);
}
public static ColumnDefinitionCollection GetColumnDefinitions(Grid element)
{
return (ColumnDefinitionCollection) element.GetValue(ColumnDefinitionsProperty);
}
}
public class ColumnDefinitionCollection : List<ColumnDefinition> {}
這一直是我的一個忌諱到必須寫出RowDefinitions和ColumnDefinitions，所以有一天我厭倦了它，並寫了一些attached properties可用於這種事情。
現在不是寫我Grid的定義是這樣的：
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
</Grid>
我可以使用
<Grid local:GridHelpers.RowCount="6"
local:GridHelpers.StarRows="5"
local:GridHelpers.ColumnCount="4"
local:GridHelpers.StarColumns="1,3">
</Grid>
它只允許Auto和*大小，但大多數時候這一切我使用。對於動態
它還支持綁定尺寸的網格
<Grid local:GridHelpers.RowCount="{Binding RowCount}"
local:GridHelpers.ColumnCount="{Binding ColumnCount}" />
這裏的情況下，代碼的副本，該網站不斷下降：
public class GridHelpers
{
#region RowCount Property
/// <summary>
/// Adds the specified number of Rows to RowDefinitions.
/// Default Height is Auto
/// </summary>
public static readonly DependencyProperty RowCountProperty =
DependencyProperty.RegisterAttached(
"RowCount", typeof(int), typeof(GridHelpers),
new PropertyMetadata(-1, RowCountChanged));
// Get
public static int GetRowCount(DependencyObject obj)
{
return (int)obj.GetValue(RowCountProperty);
}
// Set
public static void SetRowCount(DependencyObject obj, int value)
{
obj.SetValue(RowCountProperty, value);
}
// Change Event - Adds the Rows
public static void RowCountChanged(
DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
if (!(obj is Grid) || (int)e.NewValue < 0)
return;
Grid grid = (Grid)obj;
grid.RowDefinitions.Clear();
for (int i = 0; i < (int)e.NewValue; i++)
grid.RowDefinitions.Add(
new RowDefinition() { Height = GridLength.Auto });
SetStarRows(grid);
}
#endregion
#region ColumnCount Property
/// <summary>
/// Adds the specified number of Columns to ColumnDefinitions.
/// Default Width is Auto
/// </summary>
public static readonly DependencyProperty ColumnCountProperty =
DependencyProperty.RegisterAttached(
"ColumnCount", typeof(int), typeof(GridHelpers),
new PropertyMetadata(-1, ColumnCountChanged));
// Get
public static int GetColumnCount(DependencyObject obj)
{
return (int)obj.GetValue(ColumnCountProperty);
}
// Set
public static void SetColumnCount(DependencyObject obj, int value)
{
obj.SetValue(ColumnCountProperty, value);
}
// Change Event - Add the Columns
public static void ColumnCountChanged(
DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
if (!(obj is Grid) || (int)e.NewValue < 0)
return;
Grid grid = (Grid)obj;
grid.ColumnDefinitions.Clear();
for (int i = 0; i < (int)e.NewValue; i++)
grid.ColumnDefinitions.Add(
new ColumnDefinition() { Width = GridLength.Auto });
SetStarColumns(grid);
}
#endregion
#region StarRows Property
/// <summary>
/// Makes the specified Row's Height equal to Star.
/// Can set on multiple Rows
/// </summary>
public static readonly DependencyProperty StarRowsProperty =
DependencyProperty.RegisterAttached(
"StarRows", typeof(string), typeof(GridHelpers),
new PropertyMetadata(string.Empty, StarRowsChanged));
// Get
public static string GetStarRows(DependencyObject obj)
{
return (string)obj.GetValue(StarRowsProperty);
}
// Set
public static void SetStarRows(DependencyObject obj, string value)
{
obj.SetValue(StarRowsProperty, value);
}
// Change Event - Makes specified Row's Height equal to Star
public static void StarRowsChanged(
DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
if (!(obj is Grid) || string.IsNullOrEmpty(e.NewValue.ToString()))
return;
SetStarRows((Grid)obj);
}
#endregion
#region StarColumns Property
/// <summary>
/// Makes the specified Column's Width equal to Star.
/// Can set on multiple Columns
/// </summary>
public static readonly DependencyProperty StarColumnsProperty =
DependencyProperty.RegisterAttached(
"StarColumns", typeof(string), typeof(GridHelpers),
new PropertyMetadata(string.Empty, StarColumnsChanged));
// Get
public static string GetStarColumns(DependencyObject obj)
{
return (string)obj.GetValue(StarColumnsProperty);
}
// Set
public static void SetStarColumns(DependencyObject obj, string value)
{
obj.SetValue(StarColumnsProperty, value);
}
// Change Event - Makes specified Column's Width equal to Star
public static void StarColumnsChanged(
DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
if (!(obj is Grid) || string.IsNullOrEmpty(e.NewValue.ToString()))
return;
SetStarColumns((Grid)obj);
}
#endregion
private static void SetStarColumns(Grid grid)
{
string[] starColumns =
GetStarColumns(grid).Split(',');
for (int i = 0; i < grid.ColumnDefinitions.Count; i++)
{
if (starColumns.Contains(i.ToString()))
grid.ColumnDefinitions[i].Width =
new GridLength(1, GridUnitType.Star);
}
}
private static void SetStarRows(Grid grid)
{
string[] starRows =
GetStarRows(grid).Split(',');
for (int i = 0; i < grid.RowDefinitions.Count; i++)
{
if (starRows.Contains(i.ToString()))
grid.RowDefinitions[i].Height =
new GridLength(1, GridUnitType.Star);
}
}
}
嘗試將Rachel的解決方案與這一個結合起來：[在樣式中使用附加屬性]（http://stackoverflow.com/questions/7139641/how-to-use-attached-property-within-a-style）。這導致像這樣''你有你要的東西 – 2016-02-18 22:21:57
我知道這是個老問題，但我想用一個不需要任何助手類的解決方案。
可以通過使用帶有網格的ItemsControl作爲其ItemsPanelTemplate來設置ColumnDefinitions。這在下面的例子中顯示。
<ItemsControl>
<ItemsControl.Resources>
<Style TargetType="ItemsControl">
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="40" />
</Grid.ColumnDefinitions>
</Grid>
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
</Style>
</ItemsControl.Resources>
<TextBox Text="First column" />
<TextBox Text="second column" Grid.Column="1" />
</ItemsControl>
這裏有一個辦法：
1）與附加屬性這樣創建集合：
public class ColumnDefinitions : Collection<ColumnDefinition>
{
public static readonly DependencyProperty SourceProperty = DependencyProperty.RegisterAttached(
"Source",
typeof(ColumnDefinitions),
typeof(ColumnDefinitions),
new PropertyMetadata(
default(ColumnDefinitions),
OnColumnDefinitionsChanged));
public static void SetSource(Grid element, ColumnDefinitions value)
{
element.SetValue(SourceProperty, value);
}
[AttachedPropertyBrowsableForChildren(IncludeDescendants = false)]
[AttachedPropertyBrowsableForType(typeof(Grid))]
public static ColumnDefinitions GetSource(Grid element)
{
return (ColumnDefinitions)element.GetValue(SourceProperty);
}
private static void OnColumnDefinitionsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var grid = (Grid)d;
grid.ColumnDefinitions.Clear();
var columnDefinitions = (ColumnDefinitions)e.NewValue;
if (columnDefinitions == null)
{
return;
}
foreach (var columnDefinition in columnDefinitions)
{
grid.ColumnDefinitions.Add(columnDefinition);
}
}
}
2）然後，你可以使用它作爲一種資源，並在風格像這樣的網格：
請注意，必須使用x:Shared="False"。如果不是相同的定義將被添加到許多導致WPF拋出的網格。
<UserControl.Resources>
<demo:ColumnDefinitions x:Key="SomeColumnDefinitions" x:Shared="False">
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</demo:ColumnDefinitions>
<Style x:Key="SomeGridStyle" TargetType="{x:Type Grid}">
<Setter Property="demo:ColumnDefinitions.Source" Value="{StaticResource SomeColumnDefinitions}"></Setter>
</Style>
</UserControl.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition Height="5"/>
<RowDefinition />
</Grid.RowDefinitions>
<Grid Style="{StaticResource SomeGridStyle}">
<Rectangle Grid.Row="0"
Grid.Column="0"
Width="120"
Fill="Blue" />
<Rectangle Grid.Row="0"
Grid.Column="1"
Fill="Yellow" />
</Grid>
<Grid Grid.Row="2" Style="{StaticResource SomeGridStyle}">
<Rectangle Grid.Row="0"
Grid.Column="0"
Width="120"
Fill="Blue" />
<Rectangle Grid.Row="0"
Grid.Column="1"
Fill="Yellow" />
</Grid>
</Grid>
這樣會導致性能下降，因爲直到完成初始佈局階段後纔會執行。 – 2014-02-14 17:13:22
你可以擴展嗎？我做了一些跟蹤，並且在Grid元素的任何Measure/Arrange/LayoutUpdated方法/事件之前執行了「OnColumnDefinitionChanged」。它也不會影響它們執行的次數。 – 2014-02-15 01:35:51
我收到錯誤消息：''value'已經屬於另一個'ColumnDefinitionCollection'。所以我可能需要創建一個ColumnDefinition的副本。 – 2014-03-26 10:55:23