实现效果
关键代码
[DllImport("kernel32.dll")] public static extern IntPtr _lopen(string lpPathName, int iReadWrite); [DllImport("kernel32.dll")] public static extern bool CloseHandle(IntPtr hObject); public const int OF_READWRITE = 2; public const int OF_SHARE_DENY_NONE = 0x40; public readonly IntPtr HFILE_ERROR = new IntPtr(-1); //引入System.Windows.Forms.dll System.Windows.Forms.OpenFileDialog ofd = new System.Windows.Forms.OpenFileDialog(); ofd.Multiselect = false; ofd.Filter = "txt文件|*.txt"; if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK) { try { if (!File.Exists(ofd.FileName)) { MessageBox.Show("文件不存在!"); return; } IntPtr vHandle = _lopen(ofd.FileName, OF_READWRITE | OF_SHARE_DENY_NONE); if (vHandle == HFILE_ERROR) { MessageBox.Show("文件被占用!"); CloseHandle(vHandle); return; } CloseHandle(vHandle); var filePath = ofd.FileName; using (FileStream stream = File.OpenRead(filePath)) { TextRange documentTextRange = new TextRange(loadTxtRichTextBox.Document.ContentStart, loadTxtRichTextBox.Document.ContentEnd); string dataFormat = DataFormats.Text; StreamReader sr = new StreamReader(stream, Encoding.Default); documentTextRange.Load(new MemoryStream(Encoding.UTF8.GetBytes(sr.ReadToEnd())), dataFormat); } } catch(Exception ex) { MessageBox.Show("出现异常", $"{ex.Message}"); return; } }