WPF WebBrowser make sure the path or Internet address is correct

One possible cause is include chinese characters,

//Wrong code
 private void OpenClick(object sender, RoutedEventArgs e)
 {
     
     OpenFileDialog dialog=new OpenFileDialog();
     dialog.Filter = "PDF Files|*.pdf|All Files|*.*";
     if(dialog.ShowDialog()==true)
     {
         
         try
         {
             string pdfPath = dialog.FileName;
             if (File.Exists(pdfPath))
             {
                 webBrowser.Navigate(pdfPath); 
             }
         }
         catch (Exception ex)
         { 
             MessageBox.Show(ex.Message);
         } 
     }
 }

Solution

 private void OpenClick(object sender, RoutedEventArgs e)
 { 
     OpenFileDialog dialog=new OpenFileDialog();
     dialog.Filter = "PDF Files|*.pdf|All Files|*.*";
     if(dialog.ShowDialog()==true)
     {
         
         try
         {
             string pdfPath = dialog.FileName;
             if (File.Exists(pdfPath))
             {
                 Uri uri = new Uri(pdfPath, UriKind.RelativeOrAbsolute);
                 webBrowser.Navigate(uri);
             }
         }
         catch (Exception ex)
         { 
             MessageBox.Show(ex.Message);
         } 
     }
 }

The key located at convert string path as Uri 

 Uri uri = new Uri(pdfPath, UriKind.RelativeOrAbsolute);
 webBrowser.Navigate(uri);