WPF 打开txt文件

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;
	}

	
}

示例代码

OpenTxtFileWindow

参考资料

WPF富文本RichTextBox用法