compdfkit(win) - load 判空

Demo/Examples/Annotations/MainWindow.xaml.cs

@@ -89,6 +89,10 @@ namespace Annotations
 
         private void LoadDocument()
         {
+            if (pdfViewControl.PDFView.Document == null)
+            {
+                return;
+            }
             pdfViewControl.PDFView?.Load();
             pdfViewControl.PDFView?.SetShowLink(true);
             PDFGrid.Child = pdfViewControl;

Demo/Examples/ContentEditor/MainWindow.xaml.cs

@@ -108,6 +108,10 @@ namespace ContentEditor
 
         private void LoadDocument()
         {
+            if (pdfViewControl.PDFView.Document == null)
+            {
+                return;
+            }
             pdfViewControl.PDFView?.Load();
             PDFGrid.Child = pdfViewControl;
             pdfViewControl.PDFView.InfoChanged -= PdfViewer_InfoChanged;

Demo/Examples/DocsEditor/MainWindow.xaml.cs

@@ -81,6 +81,10 @@ namespace DocsEditor
          
         private void LoadDocument()
         {
+            if (pdfViewControl.PDFView.Document == null)
+            {
+                return;
+            }
             pdfViewControl.PDFView?.SetMouseMode(MouseModes.Viewer);
             pdfViewControl.PDFView?.Load();
             pdfViewControl.PDFView?.SetShowLink(true);

Demo/Examples/PDFViewer/MainPage.xaml.cs

@@ -847,6 +847,11 @@ namespace PDFViewer
 
         private void LoadDocument()
         {
+            if (pdfViewControl.PDFView.Document == null)
+            {
+                return;
+            }
+
             //Load the Document
             pdfViewControl.PDFView?.Load();
 

Demo/Examples/Viewer/MainWindow.xaml.cs

@@ -60,6 +60,10 @@ namespace Viewer
         #region Load Document
         private void LoadDocument()
         {
+            if (pdfViewControl.PDFView.Document == null)
+            {
+                return;
+            }
             pdfViewControl.PDFView?.SetMouseMode(MouseModes.Viewer);
             pdfViewControl.PDFView?.Load();
             pdfViewControl.PDFView?.SetShowLink(true);