在WPF中在窗体/Windows之间共享数据 [英] Sharing Data between Forms/Windows in WPF

问题描述

你好

昨天我问了一个有关Visual Basic和WPF的模块的问题，但仍未找到我的问题的答案.我目前正在从事一个计算项目，在该项目中必须将数据从表单"输入数据库.我的项目在Visual Basic中作为WPF应用程序.我使用WPF的原因是可以创建不同样式的表单和登录"屏幕.我试图设置2个WPF Windows，其中第一个(Window1)带有文本框，第二个(Window2)带有标签.我每次都会收到很多错误，因此，作为一个实验，我在Windows Forms而不是WPF Application下创建了一个新的新项目.在[表格1]中，我添加了一个名为[Textbox1]的文本框和一个名为[btnSend]的按钮.这是我的[Form 1]代码:

Hello

Yesterday I asked a question about Modules with Visual basic and WPF but still haven''t found an answer to my question. I am currently working on a computing project in which data must be entered in from a "Form" to a database. My project is in Visual Basic as a WPF Application. The reason I have used WPF is so that I can create different styled forms and Login screens. I attempted to set up 2 WPF Windows with Textboxes on the first one (Window1) and Labels on the second (Window2). I kept getting a number of errors every time, so as an experiment I created a fresh new project under Windows Forms rather than a WPF Application. In [Form 1] I added a textbox called [Textbox1] and a button called [btnSend]. Here is my code for [Form 1]:

Public Class Form1
    Private Sub btnSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSend.Click
        Form2.Show()
    End Sub
End Class

很简单，它要做的就是在按钮的click事件上打开Second Form.

在[表格2]中，我有一个名为[label1]的标签. (如果您想知道为什么我将这些名称保留为默认名称，那么它将使所有内容保持简单.)因此，这是[Form 2]的代码:

Very simple, All it does is open up the Second Form on the click event of the button.

On [Form 2] I have a label called [label1]. (If your wondering why I left the names as there default, its to keep everything simple.) So heres the code for [Form 2]:

Public Class Form2
    Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Label1.Text = Form1.Textbox1.Text
    End Sub
End Class

因此，[Form 2]所做的只是在加载时使[label1]等于[Form 1]上的[textbox1].我编译了该应用程序，它运行良好.在文本框中输入随机的内容，然后单击按钮，第二个表单就会加载并显示我在第一个表单中输入文本框的内容.

因此，我对自己想，好吧，现在，我将创建一个新的新WPF应用程序，创建一个WPF窗口和一个窗体，然后将代码复制到其中，调整所有名称，以使所有内容正确地链接起来……".否.我现在收到错误消息:

错误1引用非共享成员需要对象引用.

与[Form 1]上的

So what [Form 2] does, is simply when loaded make [label1] equal to [textbox1] on [Form 1]. I compiled the application and it worked fine. Typed random things into the textbox and once I clicked the button the second form loaded up and displayed whatever I had typed into the textbox on the first form.

So I thought to myself, "Ok that works, now I will create a fresh new WPF Application, create a WPF Window and a Form and copy the code in, tweak any names so that everything is linked up correctly....". No. I now get the error message:

Error 1 Reference to a non-shared member requires an object reference.

Which corresponds to the the line

Form2.Show() 

行相对应.我也收到[Form 2]中

on [Form 1]. I also get the same error message for

Label1.Text = Form1.Textbox1.Text

的相同错误消息.

只是要确保与从WPF窗口更改为标准表单无关.我创建了一个新的新项目，并创建了2个标准表单，然后再次尝试.相同的错误消息.有谁知道为什么我在WPF应用程序中却收到错误消息，而在Windows Standard Form中却没有?谁能帮我解决一些在WPF应用程序中使用Visual Basic的示例，因为我已经搜索了几天却一无所获.
谢谢

in [Form 2].

Just to make sure it wasn''t something to do with the change from a WPF Window to a standard form. I create a fresh new project and create 2 standard Forms and tried it again. Same error messages. Does anyone know why I''m getting error messages in a WPF Application but not in a Windows Standard Form? Can anyone help me with some examples using Visual Basic in a WPF Application as I have been searching for days and have found nothing.

Thank you

推荐答案

如果不看XAML，很难判断出什么问题了.
我建议您看一下MVVM模式(Google是您的朋友).它解决了与您的问题相同的问题:允许视图绑定并共享相同的数据(ViewModels).
它还说明了如何将UI控件绑定到数据，以便可以在视图中显示和更新数据.

Without a look at your XAML it is hard to judge what is wrong.
I would suggest you take look at MVVM pattern (Google is your friend). It solves very same problem as yours: allow views bind to and share same data (ViewModels).
It also explains how to bind your UI controls to data so it could be displayed and updated in your views.

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