从自定义消息框类生成对话框结果 [英] Generate dialog result from a custom message box class

问题描述

亲爱的朋友，

我正在开发类似以下内容的自定义消息框类-

Dear friend,

I am developing a custom messagebox class like the following-

Public Class MyCustomMsgBox

    Private MyForm As Form = New Form
    Private lblHeadline As Label = New Label
    Private lblMessageBody As Label = New Label
    Private btnNo As Button = New Button
    Private btnOk As Button = New Button
    Private btnYes As Button = New Button

    Public Sub New(ByVal Message As String)
        With MyForm
            .Width = 438
            .Height = 214
            .Controls.AddRange(New Control() {lblHeadline, lblMessageBody, btnNo, btnYes, btnOk})
        End With
    End Sub

    Public Shared Function ShowErrorMsg(ByVal ErrorMessage As String) As Windows.Forms.DialogResult
        Dim obj As MyCustomMsgBox = New MyCustomMsgBox(ErrorMessage)
        obj.MyForm.ShowDialog()
    End Sub

    Public Shared function ShowSuccessMsg(ByVal SuccessMessage As String) As Windows.Forms.DialogResult
       ''some code
    End Sub

    Public Shared Function AskQuestions(ByVal Questions As String) As Windows.Forms.DialogResult
       ''some code
    End Sub

    Public Shared Function ShowExceptions(ByVal ExMessage As String) As Windows.Forms.DialogResult
       ''some code
    End Sub


    ''Private Sub btnNo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnNo.Click
    ''  Windows.Forms.DialogResult.No()
    ''End Sub

End Class

这些功能具有相关的图形，颜色，标题和标题.

btnOk将返回DialogResult.Ok，btnNo将返回DialogResult.No，btnYes将返回DialogResult.Yes

我怎么知道按下了哪个按钮?

我不知道如何在无格式的类中处理按钮单击事件.

你能给我个主意吗?

提前谢谢您.

SKPaul

Those functions are designed with related graphics, color, title and heading.

btnOk will return DialogResult.Ok, btnNo will return DialogResult.No and btnYes will return DialogResult.Yes

How do i know that which button is pressed?

i dont know how to handle a button click event in a formless class.

Would you give me the idea?

Thank you in advance.

SKPaul

推荐答案

您是否尝试过:

Have you tried:

Private Sub btnNo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnNo.Click
        Me.DialogResult = DialogResult.No
End Sub

因为您没有派生您的类MyCustomMsgBox只需将其包装在表单中即可，您可以自由地以所需的方式实现返回结果.不清楚为什么您会认为这是一个问题.

可能您想从ShowErrorMsg返回对话框结果.首先，使其成为函数并返回obj.MyForm.ShowDialog().该调用已经返回System.Windows.Forms.DialogResult.现在，您想返回正确的值.这很简单，因为System.Windows.Forms.Form.DialogResult是读/写属性，因此可以为MyForm分配适当的值.将其分配给按钮的事件句柄.

在ShowSuccessMsg中执行相同的操作.

现在，我认为您的临时对象obj是多余的.它没有任何功能.您可以改为创建表单的临时实例，然后返回其DialogResult.另外，具有两个单独的功能ShowErrorMsg和ShowSuccessMsg也是非常……有问题的.

从消息对话框功能的角度来看，错误和成功之间没有明显区别.您只需使用一种方法ShowMessage即可完全满足您的要求.即使您想以不同的方式(例如，不同的颜色)显示错误和成功，方法参数也可以.通过System.Windows.Forms.MessageBoxIcon有什么问题? (还要考虑一下:为什么要显示全部成功?您可以将成功视为所有操作中最正常的预期行为，仅显示错误.:-))

为什么不重现System.Windows.Forms.MessageBox.Show方法的接口?您传递有关所需按钮和图标的信息(也可以传递有关消息缩进的信息:错误，成功或其他信息).您甚至可以改善此界面:添加图像，允许自定义按钮设置等.

—SA

As you do not derive your class MyCustomMsgBox from anything but simply wrap it around a form, you have a freedom to implement return result the way you want. Not clear why you think this is a problem.

Probably, you want to return dialog result from ShowErrorMsg. First, make it a function and return obj.MyForm.ShowDialog(). This call already returns System.Windows.Forms.DialogResult. Now, you want to return right value. It''s simple because System.Windows.Forms.Form.DialogResult is a read/write property, so you can assign proper value to MyForm. Assign it in the event handles of your buttons.

Do the same thing in ShowSuccessMsg.

Now, I think your temporary object obj is redundant. It does not carry any functionality. You can create a temporary instance of the form instead and return its DialogResult. Also, having two separate functions ShowErrorMsg and ShowSuccessMsg is very… questionable.

From the stand point of the message dialog functionality there is no distinct difference between error and success. You could perfectly satisfy your requirements with only one method ShowMessage. Even if you want to show error and success in different ways (say, different color), a method parameter will do. What''s wrong about passing System.Windows.Forms.MessageBoxIcon? (Also, think about this: why showing success at all? You can consider success as a normal most expected behavior of all operation, show only the errors. :-))

Why not reproducing interface of System.Windows.Forms.MessageBox.Show methods? You pass information about buttons you need, icon (which also conduct information about the indent of the message: error, success or something else). You can even improve this interface: add images, allow for custom button set, etc.

—SA

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