将文本附加到富文本框中的开头

发布于 2024-07-19 19:56:41 字数 731 浏览 4 评论 0原文

private void button1_Click(object sender, EventArgs e)
{
    richTextBox1.AppendText("\r\n");
    richTextBox1.Focus();
    string s = "Enter ";
    richTextBox1.AppendText(s + "\r\n");
    richTextBox1.SelectionStart = richTextBox1.Text.Length - (s.Length +1);
    richTextBox1.SelectionLength = s.Length +1;
    richTextBox1.SelectionFont = new Font("Arial", 12, FontStyle.Bold);
    richTextBox1.DeselectAll();
    richTextBox1.SelectionStart = richTextBox1.Text.Length;
    richTextBox1.SelectionLength = richTextBox1.Text.Length;
    richTextBox1.SelectionFont = new Font("Arial", 12, FontStyle.Regular);
    richTextBox1.DeselectAll();
}

每次用户单击按钮时，我希望新的“Enter”位于 RichTextBox 的顶部而不是底部。我该怎么做？

原文

private void button1_Click(object sender, EventArgs e)
{
    richTextBox1.AppendText("\r\n");
    richTextBox1.Focus();
    string s = "Enter ";
    richTextBox1.AppendText(s + "\r\n");
    richTextBox1.SelectionStart = richTextBox1.Text.Length - (s.Length +1);
    richTextBox1.SelectionLength = s.Length +1;
    richTextBox1.SelectionFont = new Font("Arial", 12, FontStyle.Bold);
    richTextBox1.DeselectAll();
    richTextBox1.SelectionStart = richTextBox1.Text.Length;
    richTextBox1.SelectionLength = richTextBox1.Text.Length;
    richTextBox1.SelectionFont = new Font("Arial", 12, FontStyle.Regular);
    richTextBox1.DeselectAll();
}

Every time a user clicks on the button I want that new "Enter" to be on the top not on the bottom of the RichTextBox. How can I do it?

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夜夜流光相皎洁 2024-07-26 19:56:42

从技术上讲，如果您将其插入到文本顶部，则您是在“插入”或“前置”，而不是“附加”。 ;)

您可以使用 SelectedText 属性在 RichTextBox 的开头插入文本。我刚刚创建了一个快速演示应用程序来测试它：

    private void button1_Click(object sender, EventArgs e)
    {
        richTextBox1.SelectionStart = 0;
        richTextBox1.SelectionLength = 0;
        richTextBox1.SelectedText = DateTime.Now.ToString();
    }

当单击 button1 时，它将在 RichTextBox 的开头插入当前时间。

Technically if you're inserting it at the top of the text, you're "inserting" or "prepending", not "appending". ;)

You can use the SelectedText property to insert text at the start of a RichTextBox. I just knocked up a quick demo app to test it out:

    private void button1_Click(object sender, EventArgs e)
    {
        richTextBox1.SelectionStart = 0;
        richTextBox1.SelectionLength = 0;
        richTextBox1.SelectedText = DateTime.Now.ToString();
    }

That inserts the current time at the start of the RichTextBox when button1 is clicked.

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无风消散 2024-07-26 19:56:42

我喜欢的最简单的方法是，

    private void button1_Click(object sender, EventArgs e)
    {
        richTextBox1.Text = DateTime.Now.ToString() + richTextBox1.Text;
    }

它将在开始时添加当前日期时间。

Simplest way i prefer is,

    private void button1_Click(object sender, EventArgs e)
    {
        richTextBox1.Text = DateTime.Now.ToString() + richTextBox1.Text;
    }

It will prepend Current DateTime at Start.

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赏烟花じ飞满天 2024-07-26 19:56:42

以前的消息似乎已经过时了。我通过以下方式解决它：

Paragraph newExternalParagraph = new Paragraph();
newExternalParagraph.Inlines.Add( new Bold(new Run("[" + hour.ToString() + ":" + minute.ToString() + "]"))
{
    Foreground = Brushes.Yellow
});
_consoleText.Document.Blocks.InsertBefore(_consoleText.Document.Blocks.FirstBlock , newExternalParagraph);

previous messages seems obsolete. I solve it by :

Paragraph newExternalParagraph = new Paragraph();
newExternalParagraph.Inlines.Add( new Bold(new Run("[" + hour.ToString() + ":" + minute.ToString() + "]"))
{
    Foreground = Brushes.Yellow
});
_consoleText.Document.Blocks.InsertBefore(_consoleText.Document.Blocks.FirstBlock , newExternalParagraph);

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