小编Edw*_*uay的帖子

如何在下面的状态栏中找到TextBlock以对齐？

我告诉过它:

• 的Horizo​​ntalAlignment = "右"
• TextAlignment = "右"

但是文字仍然不合情理地坐在左边.我还有什么要说的？

<Window x:Class="TestEvents124.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300"
        MaxWidth="700" Width="700"
        >
    <DockPanel HorizontalAlignment="Stretch" Margin="0,0,0,0" Width="Auto">

        <StatusBar Width="Auto" Height="25" Background="#888" DockPanel.Dock="Bottom" HorizontalAlignment="Stretch">
            <TextBlock 
                Width="Auto" 
                Height="Auto" 
                Foreground="#fff" 
                Text="This is the footer." 
                HorizontalAlignment="Right"
                TextAlignment="Right"
                />
        </StatusBar>

        <GroupBox DockPanel.Dock="Top" Height="Auto" Header="Main Content">
            <WrapPanel Width="Auto" Height="Auto">
                <TextBlock Width="Auto" Height="Auto" TextWrapping="Wrap" Padding="10">
                This is an example of the content, it will be swapped out here.
                </TextBlock>
            </WrapPanel>
        </GroupBox>

    </DockPanel>

</Window>

在WPF中定义DataContext似乎有两种主要方式:

• 无论是在代码是这样的:

App.xaml.cs(取自WPF MVVM Toolkit模板):

public partial class App : Application
{
    private void OnStartup(object sender, StartupEventArgs e)
    {
        // Create the ViewModel and expose it using the View's DataContext
        MainView mainView = new MainView();
        MainViewModel mainViewModel = new MainViewModel();
        mainViewModel.LoadCustomers("c:\\testdata2\\Customers.xml");
        mainView.DataContext = mainViewModel;
        mainView.Show();
    }
}

• 或者像这样的XAML:

Window1.xaml:

<DockPanel>
    <StackPanel
        HorizontalAlignment="Left"
        DockPanel.Dock="Top"
        Orientation="Horizontal">
        <StackPanel.DataContext>
            <local:CustomerViewModel />
        </StackPanel.DataContext>
        <TextBlock Text="{Binding Path=FirstName}" />
        <TextBlock Text=" " />
        <TextBlock Text="{Binding Path=LastName}" />
    </StackPanel>

    <StackPanel
        HorizontalAlignment="Left"
        VerticalAlignment="top" …

在630 x 400窗口中,我正在加载XAML元素:

• 菜单在顶部
• 动态用户控制
• 底部的页脚

问题是,当我设置UserControl的背景时,颜色只会下降到内容.我希望UserControl的背景当然涵盖整个UserControl.我试过了:

• VerticalContentAlignment = UserControl中的 "Stretch"
• VerticalConignment = UserControl中的 "Stretch"
• VerticalContentAlignment = MainView中的 "Stretch"
• VerticalAlignment = MainView中的 "Stretch"

但颜色仍然拒绝下降.我不想设置固定宽度,因为用户可以增加应用程序的大小.

如何获取UserControl的背景颜色以填充UserControl的整个区域而不仅仅是其内容的区域？

PageItemOptionsView.xaml:

<UserControl x:Class="TestMenu234.Views.PageItemOptionsView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             VerticalContentAlignment="Stretch"
             VerticalAlignment="Stretch"
             Background="#ddd">
    <StackPanel Margin="10">
        <TextBlock Text="This is the options area."/>
        <Button Content="Click to go to the Manage Customers page."
                    Width="200"/>
    </StackPanel>
</UserControl>

MainView.xaml:

<Window x:Class="TestMenu234.Views.MainView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:c="clr-namespace:TestMenu234.Commands"
    xmlns:vm="clr-namespace:TestMenu234.ViewModels"
    xmlns:v="clr-namespace:TestMenu234.Views"
    Title="Main Window" Height="400" Width="630" MinWidth="630">

...

    <DockPanel LastChildFill="False">

        <Menu DockPanel.Dock="Top">
            <MenuItem 
                Header="Pages" ItemsSource="{Binding AllPageItemViewModels}"
                      ItemTemplate="{StaticResource CodeGenerationMenuTemplate}"/> …

在我的演示者中,我有这个属性:

public List<string> PropertyNames { get; set; }

我想用ItemsControl/DataTemplate列出名称,如下所示:

<ItemsControl ItemsSource="{Binding PropertyNames}">
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Value}"/>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

由于通用列表没有命名属性,如何在Binding语句中引用该值？

我有一个27 x 27像素的图像,我在WPF中显示,但它显示大于窗口的大小.

如何让它显示其实际尺寸？

替代文字http://www.deviantsart.com/upload/m20dk6.png

XAML:

<Window x:Class="TestImage23434.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <StackPanel x:Name="MainStackPanel"/>
</Window>

代码背后:

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using System;

namespace TestImage23434
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();

            TextBlock tb = new TextBlock();
            tb.Text = "above image ";
            MainStackPanel.Children.Add(tb);

            Image img = new Image();
            img.Source = new BitmapImage(new Uri(@"C:\test\circle.png"));
            img.HorizontalAlignment = HorizontalAlignment.Left;
            img.VerticalAlignment = VerticalAlignment.Top;
            MainStackPanel.HorizontalAlignment = HorizontalAlignment.Left;
            MainStackPanel.VerticalAlignment = VerticalAlignment.Top;
            MainStackPanel.Children.Add(img);

            TextBlock tb2 …

这适用于LINQ-to-SQL:

var customersTest = from c in db.Customers
                select new
                {
                    Id = c.Id,
                    Addresses = from a in db.Addresses where c.Id.ToString() == 
                        a.ReferenzId select a
                };

foreach (var item in customersTest)
{
    Console.WriteLine(item.Id);
}

但实体框架中的类似示例会收到一条错误消息,表示它无法"将其转换为SQL",这是德语中的原始错误消息:

"'LINQ to Entities'erkennt die Methode'System.String ToString()'nicht,und diese Methode kann nicht in einenSpeicherausdruckübersetztwerden."

翻译:

"'LINQ to Entities'无法识别Method'System.String ToString()',此方法无法转换为内存表达式.

任何人都可以阐明我们如何在Entity Framework中使用这种语句或解释为什么会出现这个错误？

在下面的示例中,我能够在继承的类中创建一个虚方法,然后在继承类中覆盖它.Show()

我想用受保护的类变量做同样的事情,但我得到错误: prefix

修饰符'virtual'对此项无效

但由于我无法在我的类中将此变量定义为虚拟/覆盖,因此我收到编译器警告:

TestOverride234355.SecondaryTransaction.prefix'隐藏继承的成员'TestOverride234355.Transaction.prefix'.如果要隐藏,请使用new关键字.

幸运的是,当我添加new关键字时,一切正常,这是好的,因为我得到了相同的功能,但这提出了两个问题:

1. 为什么我可以使用虚拟/覆盖方法而不是受保护的类变量？

2. 虚拟/覆盖方法与隐藏它与新方法之间的实际区别是什么,因为至少在这个例子中它们提供相同的功能？

码:

using System;

namespace TestOverride234355
{
    public class Program
    {
        static void Main(string[] args)
        {
            Transaction st1 = new Transaction { Name = "name1", State = "state1" };
            SecondaryTransaction st2 = 
                new SecondaryTransaction { Name = "name1", State = "state1" };

            Console.WriteLine(st1.Show());
            Console.WriteLine(st2.Show());

            Console.ReadLine();
        }
    }

    public class …

如何定义一个小数组而不显式地每个小数组？

//decimal[] prices = { 39.99, 29.99, 29.99, 19.99, 49.99 }; //can't convert double to decimal
//var prices = { 39.99, 29.99, 29.99, 19.99, 49.99 }; //can't initialize... 
decimal[] prices = { (decimal)39.99, (decimal)29.99, (decimal)29.99, (decimal)19.99, (decimal)49.99 };

我有一个regionContent面板,我添加到我的视口.

如何用新内容替换其内容？

    ...
    var regionContent = new Ext.Panel({
        id: 'contentArea',
        region: 'center',
        padding:'10',
        autoScroll: true,
        html: 'this is the original content'
    });

    var viewport = new Ext.Viewport({
        layout: 'border',
        items: [ regionMenu, regionContent ]
    });

    var newPanel = new Ext.Panel({
        region: 'east',
        title: 'Info Panel',
        width: 300,
        html: 'this is a panel that is added'
    });
    // regionContent.update(newPanel); //renders as javascript code ???
    // regionContent.remove(...) //how do I remove ALL CONTENT, I will not know what is in …

在下面的示例代码中,我收到此错误:

Element TestSerializeDictionary123.Customer.CustomProperties vom Typ System.Collections.Generic.Dictionary`2 [[System.String,mscorlib,Version = 2.0.0.0,Culture = neutral,PublicKeyToken = b77a5c561934e089],[System.Object,mscorlib,Version = 2.0 .0.0,Culture = neutral,PublicKeyToken = b77a5c561934e089]]无法序列化,因为它实现了IDictionary.

当我取出Dictionary属性时,它工作正常.

如何使用字典属性序列化此Customer对象？或者我可以使用哪种替换类型的Dictionary可序列化？

using System;
using System.Collections.Generic;
using System.Xml.Serialization;
using System.IO;
using System.Xml;
using System.Text;

namespace TestSerializeDictionary123
{
    public class Program
    {
        static void Main(string[] args)
        {
            List<Customer> customers = Customer.GetCustomers();

            Console.WriteLine("--- Serializing ------------------");

            foreach (var customer in customers)
            {
                Console.WriteLine("Serializing " + customer.GetFullName() + "...");
                string xml = XmlHelpers.SerializeObject<Customer>(customer);
                Console.WriteLine(xml);
                Console.WriteLine("Deserializing ...");
                Customer customer2 = XmlHelpers.DeserializeObject<Customer>(xml); …