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分享OpenFileDialog f=new OpenFileDialog();f.Filter=@"TXT|*.txt";
if(f.ShowDialog()==DialogResult.OK){this.RichTextBox1.LoadFile(f.FileName,RichTextBoxStreamType.PlainText);}
if(f.ShowDialog()==DialogResult.OK)
{
StreamReader sr = new StreamReader(f.FileName, System.Text.Encoding.GetEncoding("GB2312"));
this.RichTextBox1.Text = sr.ReadToEnd();
}