c# - 突出显示消息框中的文本

Question

我需要显示一个消息框，但用户需要能够突出显示和复制消息框中的文本。我将如何实现这一目标？仅供参考，在 C# 中。

Answer 1

当消息框处于活动状态时，当用户按 CTRL+C 时，Windows 具有复制消息框文本的隐藏功能。

如果您需要允许用户突出显示文本，那么您需要创建一个自定义消息框来执行此操作。

Answer 2

这是我用来创建自定义 MessageBox 的一些代码。下面是 MessageBox 类：

'  A custom MessageBox class
'  Written to allow custom button text, specifically to allow for bilingual messageboxes
'
Public Class CustomMessageBox

  'Variables
  Private _btn1Return As DialogResult
  Private _btn2Return As DialogResult
  Private _btn3Return As DialogResult

  'Enumerate system icons
  Enum SystemIcons
    ErrorIcon = 1
    WarningIcon = 2
    QuestionIcon = 3
    InformationIcon = 4
  End Enum

  'Enumerate possible button combinations
  Enum ButtonTypes
    YesNo = 1
    YesNoCancel = 2
    Ok = 3
    OkCancel = 4
  End Enum

  'Enumerate possible default buttons
  Enum DefaultButton
    Button1 = 1
    Button2 = 2
    Button3 = 3
  End Enum


#Region "Constructor"
  'Constructor
  Public Sub New(ByVal text As String, ByVal caption As String, ByVal buttons As ButtonTypes, ByVal icon As SystemIcons, ByVal defaultButton As DefaultButton)
    InitializeComponent()
    Me.Text = caption
    Me.msgBoxText.Text = text
    SetupIcon(icon)
    SetupButtons(buttons, defaultButton)
  End Sub
#End Region

#Region "Functions"
  'Set text and return values of all buttons.  Also set focus to default button.
  Private Sub SetupButtons(ByVal buttons As Integer, ByVal defaultButton As Integer)
    Select Case buttons
      Case 1
        msgBoxButton1.Text = My.Resources.Caption_Yes
        _btn1Return = Windows.Forms.DialogResult.Yes
        msgBoxButton2.Text = My.Resources.Caption_No
        _btn2Return = Windows.Forms.DialogResult.No
        msgBoxButton3.Visible = False
      Case 2
        msgBoxButton1.Text = My.Resources.Caption_Yes
        _btn1Return = Windows.Forms.DialogResult.Yes
        msgBoxButton2.Text = My.Resources.Caption_No
        _btn2Return = Windows.Forms.DialogResult.No
        msgBoxButton3.Text = My.Resources.Caption_Cancel
        _btn3Return = Windows.Forms.DialogResult.Cancel
      Case 3
        msgBoxButton1.Text = My.Resources.Caption_OK
        _btn1Return = Windows.Forms.DialogResult.OK
        msgBoxButton2.Visible = False
        msgBoxButton3.Visible = False
      Case 4
        msgBoxButton1.Text = My.Resources.Caption_OK
        _btn1Return = Windows.Forms.DialogResult.OK
        msgBoxButton2.Text = My.Resources.Caption_Cancel
        _btn2Return = Windows.Forms.DialogResult.Cancel
        msgBoxButton3.Visible = False
    End Select

    'Set focus to specified default button
    Select Case defaultButton
      Case 1
        msgBoxButton1.Focus()
      Case 2
        msgBoxButton2.Focus()
      Case 3
        msgBoxButton3.Focus()
    End Select

  End Sub

  'Display specified icon
  Private Sub SetupIcon(ByVal iconValue As Integer)
    Dim icon As Icon = Nothing
    Select Case iconValue
      Case 1
        icon = System.Drawing.SystemIcons.Error
      Case 2
        icon = System.Drawing.SystemIcons.Warning
      Case 3
        icon = System.Drawing.SystemIcons.Question
      Case 4
        icon = System.Drawing.SystemIcons.Information
    End Select

    Me.msgBoxIcon.Image = icon.ToBitmap
  End Sub
#End Region

#Region "Events"
  'Set return value when button is clicked.
  Private Sub msgBoxButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles msgBoxButton1.Click
    Me.DialogResult = _btn1Return
    Me.Close()
  End Sub

  'Set return value when button is clicked.
  Private Sub msgBoxButton2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles msgBoxButton2.Click
    Me.DialogResult = _btn2Return
    Me.Close()
  End Sub

  'Set return value when button is clicked.
  Private Sub msgBoxButton3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles msgBoxButton3.Click
    Me.DialogResult = _btn3Return
    Me.Close()
  End Sub
#End Region

End Class

这是与之关联的设计器代码：

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class CustomMessageBox
    Inherits System.Windows.Forms.Form

    'Form overrides dispose to clean up the component list.
    <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

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
    Me.msgBoxText = New System.Windows.Forms.Label
    Me.msgBoxIcon = New System.Windows.Forms.PictureBox
    Me.TableLayoutPanel1 = New System.Windows.Forms.TableLayoutPanel
    Me.msgBoxButton1 = New System.Windows.Forms.Button
    Me.msgBoxButton3 = New System.Windows.Forms.Button
    Me.msgBoxButton2 = New System.Windows.Forms.Button
    CType(Me.msgBoxIcon, System.ComponentModel.ISupportInitialize).BeginInit()
    Me.TableLayoutPanel1.SuspendLayout()
    Me.SuspendLayout()
    '
    'msgBoxText
    '
    Me.msgBoxText.AutoSize = True
    Me.msgBoxText.Cursor = System.Windows.Forms.Cursors.Cross
    Me.msgBoxText.Dock = System.Windows.Forms.DockStyle.Fill
    Me.msgBoxText.FlatStyle = System.Windows.Forms.FlatStyle.Flat
    Me.msgBoxText.Location = New System.Drawing.Point(59, 0)
    Me.msgBoxText.MaximumSize = New System.Drawing.Size(245, 0)
    Me.msgBoxText.Name = "msgBoxText"
    Me.msgBoxText.Padding = New System.Windows.Forms.Padding(0, 10, 0, 10)
    Me.msgBoxText.Size = New System.Drawing.Size(39, 33)
    Me.msgBoxText.TabIndex = 6
    Me.msgBoxText.Text = "Label1"
    '
    'msgBoxIcon
    '
    Me.msgBoxIcon.Dock = System.Windows.Forms.DockStyle.Left
    Me.msgBoxIcon.Location = New System.Drawing.Point(0, 0)
    Me.msgBoxIcon.Name = "msgBoxIcon"
    Me.msgBoxIcon.Padding = New System.Windows.Forms.Padding(15, 10, 0, 0)
    Me.msgBoxIcon.Size = New System.Drawing.Size(59, 53)
    Me.msgBoxIcon.TabIndex = 4
    Me.msgBoxIcon.TabStop = False
    '
    'TableLayoutPanel1
    '
    Me.TableLayoutPanel1.AutoSize = True
    Me.TableLayoutPanel1.ColumnCount = 5
    Me.TableLayoutPanel1.ColumnStyles.Add(New System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 50.0!))
    Me.TableLayoutPanel1.ColumnStyles.Add(New System.Windows.Forms.ColumnStyle)
    Me.TableLayoutPanel1.ColumnStyles.Add(New System.Windows.Forms.ColumnStyle)
    Me.TableLayoutPanel1.ColumnStyles.Add(New System.Windows.Forms.ColumnStyle)
    Me.TableLayoutPanel1.ColumnStyles.Add(New System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 50.0!))
    Me.TableLayoutPanel1.Controls.Add(Me.msgBoxButton1, 1, 0)
    Me.TableLayoutPanel1.Controls.Add(Me.msgBoxButton3, 3, 0)
    Me.TableLayoutPanel1.Controls.Add(Me.msgBoxButton2, 2, 0)
    Me.TableLayoutPanel1.Dock = System.Windows.Forms.DockStyle.Bottom
    Me.TableLayoutPanel1.GrowStyle = System.Windows.Forms.TableLayoutPanelGrowStyle.FixedSize
    Me.TableLayoutPanel1.Location = New System.Drawing.Point(0, 53)
    Me.TableLayoutPanel1.Name = "TableLayoutPanel1"
    Me.TableLayoutPanel1.Padding = New System.Windows.Forms.Padding(0, 0, 0, 10)
    Me.TableLayoutPanel1.RowCount = 1
    Me.TableLayoutPanel1.RowStyles.Add(New System.Windows.Forms.RowStyle)
    Me.TableLayoutPanel1.Size = New System.Drawing.Size(305, 39)
    Me.TableLayoutPanel1.TabIndex = 5
    '
    'msgBoxButton1
    '
    Me.msgBoxButton1.AutoSize = True
    Me.msgBoxButton1.Location = New System.Drawing.Point(34, 3)
    Me.msgBoxButton1.Name = "msgBoxButton1"
    Me.msgBoxButton1.Size = New System.Drawing.Size(75, 23)
    Me.msgBoxButton1.TabIndex = 0
    Me.msgBoxButton1.Text = "Button1"
    Me.msgBoxButton1.UseVisualStyleBackColor = True
    '
    'msgBoxButton3
    '
    Me.msgBoxButton3.AutoSize = True
    Me.msgBoxButton3.Location = New System.Drawing.Point(196, 3)
    Me.msgBoxButton3.Name = "msgBoxButton3"
    Me.msgBoxButton3.Size = New System.Drawing.Size(75, 23)
    Me.msgBoxButton3.TabIndex = 2
    Me.msgBoxButton3.Text = "Button3"
    Me.msgBoxButton3.UseVisualStyleBackColor = True
    '
    'msgBoxButton2
    '
    Me.msgBoxButton2.AutoSize = True
    Me.msgBoxButton2.Location = New System.Drawing.Point(115, 3)
    Me.msgBoxButton2.Name = "msgBoxButton2"
    Me.msgBoxButton2.Size = New System.Drawing.Size(75, 23)
    Me.msgBoxButton2.TabIndex = 1
    Me.msgBoxButton2.Text = "Button2"
    Me.msgBoxButton2.UseVisualStyleBackColor = True
    '
    'CustomMessageBox
    '
    Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
    Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
    Me.AutoSize = True
    Me.ClientSize = New System.Drawing.Size(305, 92)
    Me.Controls.Add(Me.msgBoxText)
    Me.Controls.Add(Me.msgBoxIcon)
    Me.Controls.Add(Me.TableLayoutPanel1)
    Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog
    Me.MaximizeBox = False
    Me.MinimizeBox = False
    Me.Name = "CustomMessageBox"
    Me.SizeGripStyle = System.Windows.Forms.SizeGripStyle.Hide
    Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
    Me.Text = "MessageBox"
    Me.TopMost = True
    CType(Me.msgBoxIcon, System.ComponentModel.ISupportInitialize).EndInit()
    Me.TableLayoutPanel1.ResumeLayout(False)
    Me.TableLayoutPanel1.PerformLayout()
    Me.ResumeLayout(False)
    Me.PerformLayout()

  End Sub
  Friend WithEvents msgBoxText As System.Windows.Forms.Label
  Friend WithEvents msgBoxIcon As System.Windows.Forms.PictureBox
  Friend WithEvents TableLayoutPanel1 As System.Windows.Forms.TableLayoutPanel
  Friend WithEvents msgBoxButton1 As System.Windows.Forms.Button
  Friend WithEvents msgBoxButton3 As System.Windows.Forms.Button
  Friend WithEvents msgBoxButton2 As System.Windows.Forms.Button
End Class

Answer 3

我认为使用默认文本控件并不容易，但您可以尝试icsharpcode texteditor或Alsing 的文本编辑器控件

我已经将 icsharpcode 用于类似的东西，它很容易使用。

Answer 4

创建一个自定义消息框并使用一个禁用的 TextBox 并设置适当的样式来显示消息。

根据 Jhonny 的评论：创建一个新表单，并使用 ShowDialog 显示它

Answer 5

将新表单添加到您的项目中。在 Visual Studio 中，您可以通过转到项目 -> 添加 Windows 窗体来执行此操作。

修改表单，直到您觉得它看起来与标准窗口对话框足够接近。您需要更改的一些属性：

• 窗体边框样式
• 起始位置
• 最大化框
• 最小化框
• 显示图标
• 显示任务栏

为表单的标签使用只读文本框。并将文本框的 BorderStyle 设置为 None。

最后，使用表单的 ShowDialog() 方法将其显示为模式对话框。

PS。您还应该使用大量文本对其进行测试。您可能必须设置表单的自动调整大小模式并将文本框设置为多行并换行。

我希望这会有所帮助。