prism | 易学教程

C# WPF

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前言本文主要讲解采用WPF MVVM模式设计OPC Client的过程，算作对于WPF MVVM架构的学习记录吧！不足之处请不吝赐教，感谢！涉及知识点 C#基础 Xaml基础命令、通知和数据绑定 Prism+Blend MahApps.Metro(第三方框架) OPC 项目实现功能用户登陆（模拟登陆过程，未连接数据库） OPC同步读写、异步读写操作等开发环境 Window 10 Visual Studio 2019 .Net Framework 4.8 成品效果图项目详解 MVVM框架搭建为了节省开发时间，在事件绑定上使用了Prism框架，OPC通信方面使用了OPCDAAuto.dll类库，二者均可以通过Nuget方式安装到项目中。定义了一个DelegateCommand类用来处理属性和命令；定义了一个NotificationObject类用来通知属性和命令的改变；注意：在使用事件绑定时，需要添加引用 xmlns:i="http://schemas.microsoft.com/xaml/behaviors"，然后根据控件对应事件的名称设置绑定命令即可。比如我们想给ComboBox的SelectionChanged事件设置一个事件绑定，可这么写 xaml代码： < ComboBox x:Name ="CombServerList" Width ="120"

OnNavigatedTo or Initialize too late for binding

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问题 I'm new to Prism with Xamarin.Forms. I've implemented the ViewModel approach using the Navigation and Commanding classes. It works just fine but there's just one thing I don't understand. With the AutowireViewModel set to true the ViewModelLocator automatically fills the BindingContext for me and that is sweet. The order of things is not what I expected. First the binding for the properties on the View fire and then the OnNavigatedTo is fired. This means that my init of the properties is

Prism/WPF views/viewmodels being created twice

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问题 I have a Prism 7 / WPF / MVVM app that is configured with AutowireViewModel="True" in the views that have a viewmodel. Most of my view models have dependencies that I have configured in the Prism Unity container and these dependencies are injected into the viewmodel contructor. I do not explicitly create instances of views/viewmodels in the code behind anywhere. I also do not set the data context in XAML i.e. using DataContext element or d:DataContext). The only references in the XAML are to

Customize Dialog window prism

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问题 I have implemented the new DialogService as shown in this issue A New IDialogService for WPF However, this doesn't explain how to edit the window of the dialog itself, since the NotificationDialog is a UserControl . I have tried changing it to a Window but then an exception is raised due to not being the root Window. Any idea how can I change the Window of the dialog? Since the Title and the Icon is set in DialogViewModelBase , I have tried to add a ResizeMode property as well. In

How to Dispose a ViewModel after Popping a page with Xamarin.Forms?

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问题 What I would like to do is unsubscribe from events at the moment the ViewModel is no longer needed. I tried implementing IDisposable but nobody calls Dispose(), not Xamarin.Forms nor Prism.Forms. We have an app created with Xamarin.Forms. We use Prism.Forms to do MVVM. When navigating to a new page (push on stack) Prism.Forms wires the ViewModel to the Page. When navigating back (pop from stack) the ViewModel gets GarbageCollected after a while. The problem is however that at a point in time

Android/WASM : prismMvvm:ViewModelLocator.AutoWireViewModel=“True” is not Wire-up the ViewModel for Android and Wasm

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问题 I am trying to auto-wire up the ViewModel using prismMvvm:ViewModelLocator.AutoWireViewModel="True" in my View. For UWp it working perfectly. But with-in Android and WASM, View not able to wire up the ViewModel in my Uno platform Application using Prism. <UserControl x:Class="RepayablClient.Shared.Views.Login" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

Setting my partial View, not working xamarin

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问题 Now I got started with Prism Framework for xamarine, but I'm having a little problem achieving connections across views. I have this folder "Views" and inside it I have another folder called PartialViews. Now inside PartialViews I have a contentPage called "Header.xaml". Now I would like to atach this file to the Index.xaml view, which is located in the Views folder. I would like to atach the "Header.xaml" to other views also, like for example I would like to atach it to the "Orders.xaml"

Difference between Set() and RaisePropertyChanged()

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问题 I am reading this http://msdn.microsoft.com/en-us/magazine/jj651572.aspx to learn mvvm light framework. I download the source code Friend.cs. My question is why some set method of different property are implemented differently. For example, the setter for First name is, why I need 'ref' keyword for _firstName. Set(FirstNamePropertyName, ref _firstName, value); And the setter for DateOfBirthString is " RaisePropertyChanged(() => DateOfBirth); When will the linq expression will be evaluated?

[转]Blue Prism Interview Questions and Answers

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本文转自： https://www.rpatraining.co.in/blue-prism-interview-questions/ What is a Visual Business Object? The role of a VBO is to act as an adapter to the user interface of a specific application. To accomplish this,each VBO has three main parts: A connector, which is a standard library provided by Blue Prism for communicating with a particular kind of application user interface. An application control interface (ACI) that uses the VBO’s connector to expose the elements of a specific application’s user interface. One or more pages, each of which implements all or part of an operation that the VBO

RPA之家手把手带你入门Blue Prism教程系列6_运行Process并认识Data Item

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RPA之家手把手带你入门Blue Prism 练习一：打开并运行一段Process Data Item -本文章由RPA之家( rpazj.com )提供, 学习交流群QQ群465620839 练习一：打开并运行一段Process 登录Blue Prism，点击Studio的process选项栏，双击打开Demo1文件。一旦打开文件，找到运行操作栏。点击类似播放器播放的你会看到程序会一步一步的运行，并且相对应的data item也发生了变化，伴随着流程的走动，data item被赋予对应的值。如果你想重新运行程序，你可以按 Data Item 在Demo1的process里，我们可以看到这里生成了三个Data Item, 分别为Num1, Num2, Num3。这些Data Item都是用来储存数据。 Data Item分别有10种数据类型，我们将会通过练习的形式去掌握它们的用法。这里我们需要存储数字，所以这里的数据类型我们设为Number. Exposure指的是数据的表现形式。Statistic是指存储在数据库的数据。Enviroment指的是存储在System的Enviroment变量的数据。Sesssion指的是可在Control Room里面操作的数据。 Visiblility指的是是否设置适用process里面所有Page的选项，去掉勾选，该data