我试图在调用blocprovider之前调用configramtion dailog，但我得到了这个错误：

BlocProvider.of() called with a context that does not contain a DatasendBloc.
        No ancestor could be found starting from the context that was passed to BlocProvider.of<DatasendBloc>().

        This can happen if the context you used comes from a widget above the BlocProvider.

        The context used was: Builder

这是我的代码，我把它放在函数中，并从listview.bulder调用它：

void _showConfirmationDialog(BuildContext context, postmodel model) {
  showDialog(
    context: context,
    builder: (BuildContext dialogContext) {
      return AlertDialog(
        title: Text('Confirm Action'),
        content: Text('Do you want to perform this action?'),
        actions: <Widget>[
          TextButton(
            child: Text('Cancel'),
            onPressed: () {
              Navigator.pop(dialogContext); // Close the dialog
            },
          ),
          TextButton(
            child: Text('OK'),
            onPressed: () async {
              // Call the bloc here
              try {
                BlocProvider.of<DatasendBloc>(dialogContext).add(SendData(model));
              } catch (e) {
                print(e);
                await NotificationService.showNotification(
                  title: "Fail",
                  body: "Error occurred, please try again",
                );
              }
              Navigator.pop(dialogContext); // Close the dialog
            },
          ),
        ],
      );
    },
  );

错误来自BlocProvider.of（dialogContext）.add（SendData（model））;.如何解决这个问题？
我试过调用不同的构建上下文。在调用这个页面之前，我调用blocprovider，如下所示：

child: ElevatedButton(
                  onPressed: () {
                        Navigator.push(
                      context,
                      MaterialPageRoute(
                    builder: (_) => BlocProvider<DatasendBloc>.value(
                      value: _PostingBloc,
                      child: const SaveformApp(),
                    ),
                  )
                    );
                      },
                      
                  child: const Text('List of IDs Inspected'),
                )

如何克服这一点？