OpenFileDialog fileDialog = new OpenFileDialog();
//fileDialog.InitialDirectory = tbLocalPath.Text;
fileDialog.Title = "选择文件";
fileDialog.Filter = "xml files (*.xml)|*.xml";
fileDialog.FilterIndex = 1;
fileDialog.RestoreDirectory = true;

if (fileDialog.ShowDialog() == DialogResult.OK)
{
    String fileName = fileDialog.FileName;
    // 使用文件名
}
else
{
    // 没有选择文件时的操作
} 

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