您可以将多个富文本文件加载到vb.net中的富文本框中

Question

我在How can I read multiple text files and store them in a TextBox?上看到了一个类似的问题，但它对我正在尝试做的事情没有任何帮助。我正在尝试将多个富文本文件加载到1个富文本框中，这可能吗？我目前的代码是：

Private Sub LoadButton_Click(sender As Object, e As EventArgs) Handles LoadButton.Click

    Dim openFile1 As New OpenFileDialog()
    openFile1.DefaultExt = "*.rtf"
    openFile1.Filter = "RTF Files|*.rtf"


    Dim openFile2 As New OpenFileDialog()
    openFile2.DefaultExt = "*.rtf"
    openFile2.Filter = "RTF Files|*.rtf"

If (openFile1.ShowDialog() = System.Windows.Forms.DialogResult.OK) And 
   (openFile2.ShowDialog() = System.Windows.Forms.DialogResult.OK) Then

RichTextBox1.LoadFile(openFile1.FileName, openFile2.FileName)

End If

End Sub

将一个文件加载到文本框没有问题，但如果我尝试使用第一个文件添加第二个文件，则会崩溃。

我得到的当前错误是“从字符串转换”C：\ Software Development \ Test \ ann“to type'Engger'无效。”

C：\ Software Development \ Test \ ann是openFile2.FileName