这个问题已经回答了。我已经稍微改进了代码（至少我是这么认为的）。它现在让人想起了用 C# 在富文本框中打开文件这个问题的公认答案。如果我没有犯任何错误（我可能有），代码应该保存一个包含富文本框 rtfMain 中的文本的文件。默认文件扩展名为 .txt。您也可以使用文件扩展名 .rtf。
private void menuFileSave_Click(object sender, EventArgs e)
{
// Create a new SaveFileDialog object
using (SaveFileDialog dlgSave = new SaveFileDialog())
try
{
// Default file extension
dlgSave.DefaultExt = "txt";
// SaveFileDialog title
dlgSave.Title = "Save File As";
// Available file extensions
dlgSave.Filter = "Text Files (*.txt)|*.txt|RTF Files (*.rtf)|*.rtf";
// Show SaveFileDialog box and save file
if (dlgSave.ShowDialog() == DialogResult.OK)
{
// Save as .txt file
if (Path.GetExtension(dlgSave.FileName) == ".txt")
{
rtfMain.SaveFile(dlgSave.FileName, RichTextBoxStreamType.PlainText);
}
// Save as .rtf file
if (Path.GetExtension(dlgSave.FileName) == ".rtf")
{
rtfMain.SaveFile(dlgSave.FileName, RichTextBoxStreamType.PlainText);
}
}
catch (Exception errorMsg)
{
MessageBox.Show(errorMsg.Message);
}
}
}
private void rtfMain_TextChanged(object sender, EventArgs e)
{
}
更新：我进一步改进了代码（至少我是这么认为的）。主要区别在于您现在可以更好地控制文件编码。这是我现在正在使用的代码：
private void fileSave_Click(object sender, EventArgs e)
{
// Text from the rich textbox rtfMain
string str = rtfMain.Text;
// Create a new SaveFileDialog object
using (SaveFileDialog dlgSave = new SaveFileDialog())
try
{
// Available file extensions
dlgSave.Filter = "All Files (*.*)|*.*";
// SaveFileDialog title
dlgSave.Title = "Save";
// Show SaveFileDialog
if (dlgSave.ShowDialog() == DialogResult.OK && dlgSave.FileName.Length > 0)
{
// Save file as utf8 without byte order mark (BOM)
// ref: http://msdn.microsoft.com/en-us/library/s064f8w2.aspx
UTF8Encoding utf8 = new UTF8Encoding();
StreamWriter sw = new StreamWriter(dlgSave.FileName, false, utf8);
sw.Write(str);
sw.Close();
}
}
catch (Exception errorMsg)
{
MessageBox.Show(errorMsg.Message);
}
}