如何从文本文件中将文本复制到richbox？

Question

我希望在加载表单时将.txt文件中的文本复制到richbox中。 我不想打开一个对话框来选择文件，只需自动打开一个特定的文件

 Stream sr;
        OpenFileDialog openFileDialog1 = new OpenFileDialog();
        if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            if ((sr = openFileDialog1.OpenFile()) != null)
            {
                string strfilename = openFileDialog1.FileName;
                string commandstext = File.ReadAllText(strfilename);
                richTextBox2.Text=commandstext;
            }
        }

Answer 1

您也可以按照其他2个答案中的建议进行操作。

或其他 faster 方式为：

void LoadFileToRTB(string fileName, RichTextBox rtb)
{
  rtb.LoadFile(File.OpenRead(fileName), RichTextBoxStreamType.PlainText); // second parameter you can change to fit for you
  // or
  rtb.LoadFile(fileName);
  // or
  rtb.LoadFile(fileName, RichTextBoxStreamType.PlainText); // second parameter you can change to fit for you
}

Answer 2

    Stream sr;
    string strfilename = "PATH TO FILE"; //Code should know the path already
    string commandstext = File.ReadAllText(strfilename);
    richTextBox2.Text=commandstext;

Answer 3

        using (StreamReader sr = new StreamReader("YourFilePath.txt"))
        {
            String line = sr.ReadToEnd();
            richTextBox2.Text=line;
        }