桌面端原材料入场记录完善

yy-admin-master/YY.Admin/Infrastructure/Print/HtmlToPdfRenderer.cs

@@ -17,7 +17,7 @@ public static class HtmlToPdfRenderer
     {
         var tcs = new TaskCompletionSource<string>(TaskCreationOptions.RunContinuationsAsynchronously);
 
-        Application.Current.Dispatcher.InvokeAsync(async () =>
+        Application.Current?.Dispatcher.InvokeAsync(async () =>
         {
             try
             {
@@ -30,6 +30,11 @@ public static class HtmlToPdfRenderer
             }
         });
 
+        if (Application.Current == null)
+        {
+            tcs.TrySetException(new InvalidOperationException("WPF Application 未初始化，无法生成 PDF"));
+        }
+
         return tcs.Task;
     }