小编Zwi*_*zak的帖子

我正在创建一个MVVM应用程序.

在我的模型中,我需要处理在View中显示的System.Windows.Forms.Panel.我的想法是在ViewModel中创建这个Panel,然后从一侧 - 将View绑定到它,另一边将其句柄传递给模型.

我有一个WindowsFormsHost控件:

<Page x:Class="Test.Views.RenderPage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:WinForms="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:Test.Views"
      mc:Ignorable="d" 
      d:DesignHeight="800" d:DesignWidth="1200"
      Title="Page1">

    <DockPanel>
        <WindowsFormsHost x:Name="winformsHost" Child="{Binding RenderPanel}"/>
    </DockPanel>
</Page>

我想将它的Child属性与ViewModel提供的RenderPanel绑定

public ObservableObject<System.Windows.Forms.Panel> RenderPanel { get; private set; }

public VideoRecorderViewModel ()
{
    RenderPanel = new System.Windows.Forms.Panel (); //Bind it here
    var model = new Model (RenderPanel.Handle); pass it to the model
}

但是,我收到一个错误说:

System.Windows.Markup.XamlParseException: 
A 'Binding' cannot be set …

我想阅读Windows的事件日志.我不确定这是不是最好的方法,但我想使用pywin32 - > win32evtlog模块来做到这一点.首先,可以使用此库从Windows 7读取日志,如果是这样,如何读取与应用程序运行相关的事件(运行.exe必须在Windows中的事件日志中留下痕迹我猜).

我已经设法在网上找到一些小例子,但这对我来说还不够,遗憾的是文档写得不好; /

import win32evtlog

hand = win32evtlog.OpenEventLog(None,"Microsoft-Windows-TaskScheduler/Operational")
print win32evtlog.GetNumberOfEventLogRecords(hand)

我想在我的 PyQt4 GUI 中创建一个导航工具栏，但我无法让它工作，我必须承认我主要是复制粘贴了这段代码，但我并没有真正理解它。如果您能告诉我如何添加 NavigationToolbar 并解释它是如何制作的，那就太好了。先感谢您。

顺便提一句。我看过这篇文章，但我相信它与我的不同，我不知道如何使用它。

from PyQt4 import QtGui
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas

from matplotlib.figure import Figure

class MplCanvas(FigureCanvas):

    def __init__( self ):
        self.fig = Figure()
        self.ax = self.fig.add_subplot( 111 )

        FigureCanvas.__init__( self, self.fig )
        FigureCanvas.setSizePolicy( self, QtGui.QSizePolicy.Expanding,QtGui.QSizePolicy.Expanding )
        FigureCanvas.updateGeometry( self )


class matplotlibWidget(QtGui.QWidget):

    def __init__( self, parent = None ):
        QtGui.QWidget.__init__( self, parent )
        self.canvas = MplCanvas()
        #self.toolbar = self.canvas.toolbar #Dunno How :(

        self.vbl = QtGui.QVBoxLayout()
        self.vbl.addWidget( self.canvas )
        self.setLayout( self.vbl )

我有一个结构列表:

struct MyStruct{
    int ID;
    string name;
    string surname;
}
List<MyStruct> list1 = new List<MyStruct>();
///here the list is being updated so that it has some elements

现在我想从list1中提取所有ID并放入另一个列表:

List<int> list2 = new List<int>();
list2.AddRange(list1.GetIds() /*LINQ HERE*/);

诀窍是我想用LINQ来做,但我仍然不太了解它.我知道它可以用普通的for循环完成,但我想使用AddRange和LINQ.

我有一个抽象类,我想为从我的抽象类继承的所有类实现Singleton模式.我知道我的代码不起作用,因为会有元类属性冲突.任何想法如何解决这个问题？

from abc import ABCMeta, abstractmethod, abstractproperty

class Singleton(type):
    _instances = {}
    def __call__(cls, *args, **kwargs):
        if cls not in cls._instances:
            cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
        return cls._instances[cls]

class GenericLogger(object):
    __metaclass__ = ABCMeta

    @abstractproperty
    def SearchLink(self): pass

class Logger(GenericLogger):
    __metaclass__ = Singleton

    @property
    def SearchLink(self): return ''

a = Logger()

我想结合QtDesigner生成的Ui.我想将它与myplotlib合并,以便所有内容都在一个窗口中.当我运行以下代码时,我收到一个错误:

"QWidget::setLayout: Attempting to set QLayout "" on Ui_MainWindow "", which already has a layout

我知道我应该将我的画布布局与某些内容联系起来,但我不知道是什么.我希望你能在这里帮助我:

from PyQt4 import QtCore, QtGui
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.backends.backend_qt4agg import NavigationToolbar2QT as NavigationToolbar
import matplotlib.pyplot as plt


try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(QtGui.QMainWindow):
    def __init__(self, parent = None):
        super(Ui_MainWindow, self).__init__(parent)

        # …

我有这个代码将在Distinct()将返回的每个对象上执行Console.WriteLine(x).

objects.Distinct().ToList().ForEach(x => Console.WriteLine(x));

但是,如何在不使用ToList()的情况下实现相同的功能？

我正在使用Prism Framework编写MVVM应用程序.当属性值更改时,我无法更新标签.当我创建模型并为属性分配初始值时,绑定到它的标签会更新.但是当我在应用程序生命周期内更改属性时,标签将不会更新其内容.

这是我的xaml:

<Window x:Class="Project.Views.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="700" Width="700">
    <DockPanel LastChildFill="True">
            <Button x:Name="btnStart" Command="{Binding Path=Start}" Content="StartProcess"/>

            <GroupBox Header="Current Operation">
                <Label x:Name="lblCurrentOperation" Content="{ Binding  CurrentOperationLabel, UpdateSourceTrigger=PropertyChanged}"/>
            </GroupBox>
    </DockPanel>
</Window>

这是我的ViewModel:

public class MyModelViewModel : BindableBase
{
    private MyModel model;
    private string currentOpeartion;

    public DelegateCommand Start { get; private set; }

    public string CurrentOperationLabel
    {
        get { return currentOpeartion; }
        set { SetProperty(ref currentOpeartion, value); }
    }

    public MyModelViewModel ()
    {
        model = new MyModel ();

        Start  = new DelegateCommand (model.Start); …