vb.net richtextbox 乱码

当在vb.net中使用RichTextBox控件加载TXT文档时，如果文档中含有中文字符，很可能会出现乱码现象。这是因为RichTextBox默认使用的是ANSI编码，而中文字符一般使用的是UTF-8编码。为了解决这个问题，可以使用以下两种方法：

1. 将文档编码转换为ANSI编码。可以使用System.Text.Encoding类的GetEncoding方法将文档编码转换为ANSI编码，然后再将转换后的文本加载到RichTextBox控件中。示例代码如下：

Dim sr As New StreamReader("test.txt", System.Text.Encoding.GetEncoding("GB2312"))
RichTextBox1.Text = sr.ReadToEnd()
sr.Close()

2. 将RichTextBox控件的编码设置为UTF-8编码。可以使用System.Text.Encoding类的UTF8属性将RichTextBox控件的编码设置为UTF-8编码，然后再将文本加载到RichTextBox控件中。示例代码如下：

RichTextBox1.Text = My.Computer.FileSystem.ReadAllText("test.txt", System.Text.Encoding.UTF8)

相关问题

vb.net richtextbox 打印

在VB.NET中，可以使用PrintDocument类实现对RichTextBox控件内容的打印。以下是一个简单的示例代码：

首先，在窗体上添加一个名为RichTextBox1的RichTextBox控件和一个名为Button1的按钮。

然后，在Button1的Click事件中添加以下代码：

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim printDocument As New Printing.PrintDocument()
AddHandler printDocument.PrintPage, AddressOf PrintDocument_PrintPage
PrintDialog1.Document = printDocument

If PrintDialog1.ShowDialog() = Windows.Forms.DialogResult.OK Then
printDocument.Print()
End If
End Sub

Private Sub PrintDocument_PrintPage(sender As Object, e As Printing.PrintPageEventArgs)
Dim printFont As New Font("Arial", 12)
Dim leftMargin As Single = e.MarginBounds.Left
Dim topMargin As Single = e.MarginBounds.Top
Dim printAreaHeight As Single = e.MarginBounds.Height

Dim lineCount As Integer = CInt(printAreaHeight / printFont.Height)
Dim linesPerPage As Integer = lineCount

Dim yPos As Single = topMargin

Dim count As Integer = 0
Dim line As String = ""
Dim lines As String() = RichTextBox1.Text.Split(vbCrLf)

While count < linesPerPage AndAlso lines.Count > 0
line = lines(0)
lines = lines.Skip(1).ToArray()

yPos = topMargin + count * printFont.Height
e.Graphics.DrawString(line, printFont, Brushes.Black, leftMargin, yPos, New StringFormat())
count += 1

If lines.Count = 0 AndAlso line <> "" Then
e.HasMorePages = True ' 如果文本过长，则需要分页打印
lines = RichTextBox1.Text.Split(vbCrLf)
End If
End While

If count = linesPerPage Then
e.HasMorePages = True ' 如果文本过长，则需要分页打印
End If
End Sub

在上述代码中，我们使用PrintDocument类来创建一个打印文档对象，并在按钮点击事件中为其指定打印事件处理程序PrintDocument_PrintPage。在PrintDocument_PrintPage事件中，我们使用PrintPageEventArgs参数来获取打印的相关信息，包括打印区域的大小和位置等。

我们使用分页的方式逐行将RichTextBox中的文本打印出来，通过通过e.Graphics.DrawString方法将每一行文本绘制到打印区域上，并根据打印的行数来判断是否需要分页打印。

最后，我们使用PrintDialog控件来显示打印对话框，并根据用户的选择来打印文档。

请注意，上述代码只是一个简单的示例，可能没有考虑到所有的情况，如在打印过程中可能需要处理更多的设置和异常情况等。在实际应用中，您可能还需要进行其他的处理和优化。

vb.net richtextbox print

To print the contents of a RichTextBox control in VB.NET, you can use the PrintDocument class and the PrintDialog control. Here's an example code:

Private Sub btnPrint_Click(sender As Object, e As EventArgs) Handles btnPrint.Click
    ' Initialize the PrintDocument object
    Dim pd As New PrintDocument()

    ' Set the PrintPage event handler
    AddHandler pd.PrintPage, AddressOf pd_PrintPage

    ' Display the PrintDialog control and get the user's choice
    Dim pdResult As DialogResult = PrintDialog1.ShowDialog()

    ' If the user clicks OK, print the document
    If pdResult = DialogResult.OK Then
        pd.Print()
    End If
End Sub

Private Sub pd_PrintPage(sender As Object, e As PrintPageEventArgs)
    ' Get the text from the RichTextBox control
    Dim text As String = RichTextBox1.Text

    ' Set the font and the margins
    Dim font As New Font("Arial", 12)
    Dim margins As New Margins(50, 50, 50, 50)

    ' Calculate the rectangle for the text
    Dim rect As New RectangleF(e.MarginBounds.Left, e.MarginBounds.Top, e.MarginBounds.Width, e.MarginBounds.Height)

    ' Print the text
    e.Graphics.DrawString(text, font, Brushes.Black, rect)

    ' If there is more text to print, set the HasMorePages property to True
    If RichTextBox1.TextLength > text.Length Then
        e.HasMorePages = True
    Else
        e.HasMorePages = False
    End If
End Sub

In this example, the `btnPrint_Click` event handler initializes a new PrintDocument object and sets the PrintPage event handler to `pd_PrintPage`. It then displays the PrintDialog control and gets the user's choice. If the user clicks OK, the document is printed using the `Print` method of the PrintDocument object.

The `pd_PrintPage` event handler gets the text from the RichTextBox control, sets the font and margins, and calculates the rectangle for the text. It then prints the text using the `DrawString` method of the Graphics object. If there is more text to print, it sets the HasMorePages property to True to indicate that another page is needed.