如何使用VB.NET以编程方式在Rich TextBox中添加粗体文本

Question

我有这段代码：

print_text.Text = "Patient number: " + ds.Tables("patients").Rows(0).Item(0)
print_text.AppendText(Environment.NewLine)
print_text.Text = print_text.Text + "Last name: " + ds.Tables("patients").Rows(0).Item(1)
print_text.AppendText(Environment.NewLine)

现在上面的数据我正在以编程方式添加并且工作正常。但是，在上面的代码中，我想以粗体字添加Patient number和Last name。

Answer 1

使用RichTextBox时，为什么不直接使用RTF？

---

示例：

Sub Main
    Dim f = new Form()
    Dim print_text = new RichTextBox() With {.Dock = DockStyle.Fill}
    f.Controls.Add(print_text)

    Dim sb = new System.Text.StringBuilder()
    sb.Append("{\rtf1\ansi")
    sb.Append("This number is bold: \b 123\b0 ! Yes, it is...")
    sb.Append("}")
    print_text.Rtf = sb.ToString()

    f.ShowDialog()
End Sub

<强>结果：

MSDN

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这样，您也可以轻松地将RTF内容包装到扩展方法中：

Module RtfExtensions

    <Extension()>
    Public Function ToRtf(s As String) As String
        Return "{\rtf1\ansi" + s + "}"
    End Function

    <Extension()>
    Public Function ToBold(s As String) As String
        Return String.Format("\b {0}\b0 ", s)
    End Function

End Module

并像

一样使用它

Dim text = "This number is bold: " + "123".ToBold() + "! Yes, it is..."
print_text.Rtf = text.ToRtf()

Answer 2

使用RichTextBox.SelectionFont财产 请查看以下MSDN链接：Link 1和Link 2

希望它有所帮助。
编辑：

  Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    Dim len As Integer
    RichTextBox1.Text = "Patient number: " + " 12345"
    RichTextBox1.SelectionStart = 0
    RichTextBox1.SelectionLength = "Patient number".Length
    RichTextBox1.SelectionFont = New Font("Arial", 12, FontStyle.Bold)
    RichTextBox1.SelectionLength = 0
    RichTextBox1.AppendText(Environment.NewLine)
    len = RichTextBox1.Text.Length
    RichTextBox1.AppendText("Last name: " + " ABCD")
    RichTextBox1.SelectionStart = len
    RichTextBox1.SelectionLength = "Last name".Length
    RichTextBox1.SelectionFont = New Font("Arial", 12, FontStyle.Bold)
    RichTextBox1.SelectionLength = 0
End Sub