设计者未保存基类的属性值 [英] Property value of base class not saved by designer

问题描述

我已在Visual Studio Express 2013中的WinForms项目中添加了一个表单，希望用作其他表单的基本表单。假设我在此表单上放置了一个按钮，并且我想拥有一个使该按钮可见或不可见的属性。

I have added a form to my WinForms project in Visual Studio Express 2013 that I want to use as a base form for other forms. Say I put a button on this form and I want to have a property that makes this button visible or invisible.

Imports System.ComponentModel
Public Class MyForm
    <DesignerSerializationVisibility(DesignerSerializationVisibility.Content)>
    Public Property ButtonVisible As Boolean
        Get
            Return Button1.Visible
        End Get
        Set(value As Boolean)
            Button1.Visible = value
        End Set
    End Property
End Class

此文件的设计者是没有改变。我只是在新表单中添加了一个按钮。

The designer for this file was not changed. I just added a button to a new form.

当我现在创建一个继承该类的新表单时，可以更改此属性的值，并在设计时更改按钮确实变得可见或不可见。但是，当我编译项目时，该属性会重置为默认值。当我检查派生窗体的设计器文件时，我发现未将更改后的属性值添加到该文件中，因此消失了。
当我将 ButtonVisible = False 手动添加到设计器文件时，它可以正常工作并停留在该文件中，所以我想问题出在以下事实：设计器未添加

When I now create a new form that inherits this class I can change the value of this property and at design time the button indeed becomes visible or invisible. However when I compile the project the property is resetted back to the default value. When I examine the designer file of the derived form I see, that the changed property value is not added to it and therefore vanishes into thin air. When I add ButtonVisible = False manually to the designer file it works and stays there, so I guess the problem lies in the fact, that the Designer does not add the line to the designer file.

这是在我更改设计器中的属性值之后，派生表单的设计器文件：

This is the designer file of the derived form, after I changed the property value in the designer:

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class Form2
    Inherits MyForm

    'Das Formular überschreibt den Löschvorgang, um die Komponentenliste zu bereinigen.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        Try
            If disposing AndAlso components IsNot Nothing Then
                components.Dispose()
            End If
        Finally
            MyBase.Dispose(disposing)
        End Try
    End Sub

    'Wird vom Windows Form-Designer benötigt.
    Private components As System.ComponentModel.IContainer

    'Hinweis: Die folgende Prozedur ist für den Windows Form-Designer erforderlich.
    'Das Bearbeiten ist mit dem Windows Form-Designer möglich.  
    'Das Bearbeiten mit dem Code-Editor ist nicht möglich.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.SuspendLayout()
        '
        'Form2
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(284, 261)
        Me.Name = "Form2"
        Me.Text = "Form2"
        Me.ResumeLayout(False)

    End Sub
End Class

如您在顶部代码中所见，我已经尝试通过测试 DesignerSerializationVisible的不同值来解决此问题。 ，但它们似乎没有作用。

As you can see in the code at the top, I already tried to solve the problem by testing the different values for DesignerSerializationVisible, but they seem to have no effect.

有什么我忽略的东西吗？

无论您最喜欢哪种方式，C＃或VB.NET答案都很受赞赏。

Is there anything I overlooked? How should I add properties that change controls in the underlying base class?
Both C# or VB.NET answers are very much appreciated, whatever you like best.

推荐答案

首先，您似乎误解了 DesignerSerializationVisibility.Content 值 DesignerSerializationVisibility 属性。

First, it seems you misunderstood the DesignerSerializationVisibility.Content value of DesignerSerializationVisibility attribute.

您需要使用 DesignerSerializationVisibility.Visible 值保存广告的值属性。
参见以下相关说明：属性不会获得序列化为.designer.cs文件

You need to use the DesignerSerializationVisibility.Visible value to save the value of a property. See this related tread: Properties won't get serialized into the .designer.cs file

然后，您不能直接引用按钮.Visible 您的自定义属性中的属性。每次您打开继承的表单时，按钮的可见状态将重置为其默认值（ True ）。因此，在加载表单时，您的自定义属性将始终显示 True 。

Then you can't refer directly to the Button.Visible property in your custom property. The visibility state of the button will be reset to its default value (True) each time you open the inherited form. So your custom property will always show True when the form will be loaded.

您需要

• 将状态存储在变量中


• 在 InitializeComponent 方法以及您的财产的价值何时更改。



• store the state in a variable
• adjust the button visibility after InitializeComponent method and when the value of your property changes.

Public Class MyForm

    Public Sub New()
        InitializeComponent()
         Me.Button1.Visible = _buttonVisibility
    End Sub

    Private _buttonVisibility As Boolean = True

    <DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)>
    Public Property ButtonVisible As Boolean
        Get
            Return _buttonVisibility
        End Get
        Set(value As Boolean)
            _buttonVisibility = value
            Button1.Visible = value
        End Set
    End Property

End Class

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