我是这个论坛的新手。 我有一个使用c#和xaml定义的自定义用户控件。当我把这个控件放到WPF窗口时,它可以工作。即使我可以编辑xaml代码标签并插入我的控件。但是当我在c#代码中使用我的控件时,它不起作用。
这是我的xaml控件定义
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:local="clr-namespace:UserControl"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<!-- Resource dictionary entries should be defined here. -->
<Style TargetType="{x:Type local:WellImage}">
<Setter Property="Focusable" Value="false" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:WellImage}">
<Grid Width="Auto" Height="Auto">
<Ellipse Stroke="{Binding Path=WellBorder, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}"
StrokeThickness="{Binding Path=WellBorderThickness, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}"
x:Name="Border" Width="Auto" Height="Auto"
HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
Fill="{Binding Path=OuterBackGround, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" />
<Ellipse StrokeThickness="0" Margin="25,37,25,18" RenderTransformOrigin="0.5,0.5"
Fill="{Binding Path=InnerBackGround, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
这是我的c#控件定义
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
namespace UserControl
{
public class WellImage : System.Windows.Controls.Button
{
public static readonly DependencyProperty InnerBackGroundProperty = DependencyProperty.Register("InnerBackGround", typeof(RadialGradientBrush), typeof(WellImage));
public static readonly DependencyProperty OuterBackGroundProperty = DependencyProperty.Register("OuterBackGround", typeof(RadialGradientBrush), typeof(WellImage));
public static readonly DependencyProperty WellBorderProperty = DependencyProperty.Register("WellBorder", typeof(SolidColorBrush), typeof(WellImage));
public static readonly DependencyProperty WellBorderThicknessProperty = DependencyProperty.Register("WellBorderThickness", typeof(double), typeof(WellImage));
public WellImage()
{
// Insert code required on object creation below this point.
InnerBackGround = (RadialGradientBrush)this.Resources["WellSelectedInnerCircleBrush"];
OuterBackGround = (RadialGradientBrush)this.Resources["WellSelectedOuterCircleBrush"];
WellBorder = (SolidColorBrush)this.Resources["NormalBackgroundBrush"];
WellBorderThickness =2;
}
static WellImage()
{
//This OverrideMetadata call tells the system that this element wants to provide a style that is different than its base class.
//This style is defined in themes\generic.xaml
DefaultStyleKeyProperty.OverrideMetadata(typeof(WellImage), new FrameworkPropertyMetadata(typeof(WellImage)));
}
public RadialGradientBrush InnerBackGround
{
get { return (RadialGradientBrush)GetValue(InnerBackGroundProperty); }
set { SetValue(InnerBackGroundProperty, value); }
}
public RadialGradientBrush OuterBackGround
{
get { return (RadialGradientBrush)GetValue(OuterBackGroundProperty); }
set { SetValue(OuterBackGroundProperty, value); }
}
public SolidColorBrush WellBorder
{
get { return (SolidColorBrush)GetValue(WellBorderProperty); }
set { SetValue(WellBorderProperty, value); }
}
public double WellBorderThickness
{
get { return (double)GetValue(WellBorderThicknessProperty); }
set { SetValue(WellBorderThicknessProperty, value); }
}
}
}
这是尝试通过c#
访问此控件的方法 WellImage image = new WellImage();
image.Height = 40;
image.Width = 40;
image.Margin = new Thickness(30, 30, 30, 30);
image.VerticalAlignment = VerticalAlignment.Top;
image.HorizontalAlignment = HorizontalAlignment.Left;
image.Content = "WellButton";
grid.Children.Insert(0, image);
grid.Background = Brushes.LightBlue;
grid.Width = 120;
grid.Height = 100;
grid.VerticalAlignment = VerticalAlignment.Top;
grid.HorizontalAlignment = HorizontalAlignment.Left;
gridPartialedMicroPlate.Children.Insert(0, grid);
为什么我无法访问我的控件?
答案 0 :(得分:3)
您有三个主要问题:
空刷
InnerBackground,OuterBackground和WellBorder为null的原因是您在构造函数中将它们设置为null。例如,这一行是个问题:
InnerBackGround = (RadialGradientBrush)this.Resources["WellSelectedInnerCircleBrush"];
这一行有两个问题:
此问题的最佳解决方案是在Style中而不是在构造函数中设置这些属性:
<Style TargetType="{x:Type local:WellImage}">
<Setter Property="Focusable" Value="false" />
<Setter Property="InnerBackground" Value="{DynamicResource WellSelectedInnerCircleBrush}" />
...
如果你真的想在构造函数中这样做,你可以在那里构造一个DynamicResource引用:
SetValue(InnerBackgroundProperty,
new DynamicResourceExtension("WellSelectedInnerCircleBrush")
.ProvideValue());
缺少ContentPresenter
如果你在模板中包含了一个ContentPresenter,你会看到显示字符串“WellButton”,即使这些省略号是不可见的。
您应该考虑修改ControlTemplate以包含ContentPresenter以显示Content属性。分配Content属性但不显示它似乎毫无意义。
零尺寸椭圆
每个椭圆都设置为宽度=“自动”高度=“自动”,椭圆表示零大小。即使它们有刷子,这也会使你的椭圆不可见。
此外,网格设置为Width =“Auto”Height =“Auto”,这意味着将其内容压缩到最小的空间。这意味着如果WellButton设置为VerticalAlignment =“Stretch”或HorizontalAlignment =“Stretch”,它将固执地拒绝实际伸展。这在自定义控件中是一件坏事。
删除您说Width =“Auto”和Height =“Auto”的地方,而不是取消设置高度和宽度。
其他问题和挑剔
你的第二个椭圆有StrokeThickness =“0”,这对我没有意义,因为没有中风。为什么不把它留下来?因为没有RenderTransform,所以同样适用于RenderTransformOrigin。
你的第一个椭圆不需要指定HorizontalAlignment =“Stretch”VerticalAlignment =“Stretch”,因为这是默认值。
你的绑定太复杂了:
TemplateBinding语法:
<Ellipse Stroke="{TemplateBinding WellBorder}"
... />
第二个椭圆上的边距非常大,即使你的C#代码中的宽度=“40”高度=“40”也被尊重(因为自动问题已修复),椭圆仍然没有大小。还有一个椭圆具有如此不寻常的余量似乎很奇怪。
Nitpick:“背景”是一个英文单词,中间没有大写字母G.