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;
}
}