Hi Zhong Wanghua,

Could you elaborate more about the error, if you have sample, screenshot, or error log, it will be help us to troubleshoot the error.

Please note you can read more about how to pull to refresh in this article:
http://www.intersoftpt.com/Community/Crosslight/How-to-Pull-to-Refresh/

Best Regards,
Arief

This is my project ，To regenerate the there is a problem 。I want to achieve, drag load data ，To an unknown error 。I use “DataListViewModelBase”implementation 。Can you give me one Run the example 。Thank you very much 。I have been learning for a long time Hasn't been made 。

Binding times wrong data 。

Hi Zhou Wanghua,

What Platform did you use? iOS/Android/WinPhone

did you already use this code in your binding provider? your binding provider lack this code:
this.AddBinding("TableView", BindableProperties.RefreshCommandProperty, "RefreshCommand");

Can you show me the screenshot/error log of the error?

Here is our working samples: http://git.intersoftpt.com/projects/CROS/repos/samples/browse/MyInventory_WebApi

Also sorry i give your wrong link, here is the how to link: http://developer.intersoftpt.com/display/crosslight/Enabling+Pull+to+Refresh

When I am through “ this.NavigationService.Navigate<MachineTimeViewModel>();”The navigation view ，not find "MachineTimeViewModel"

In the following error As shown in figure 

namespace MyInventory.ViewModels{
    public class MachineTimeViewModel: DataListViewModelBase<Item, IItemRepository>
    {
        private ItemQueryDefinition _queryDefinition = null;

        public ItemListViewModel()
        {
            // configure data behaviors
            this.EnableRefresh = true;
            this.EnableIncrementalRefresh = true;
            this.EnableIncrementalLoading = true;
            this.EnableAsyncFilter = true;
            this.IncrementalLoadingSize = 20;

            // commands
            this.LoadIncrementalCommand = new DelegateCommand(ExecuteLoadIncrementalCommand,
                                                           CanExecuteLoadIncrementalCommand);
        }

        public DelegateCommand LoadIncrementalCommand
        {
            get;
            set;
        }

        public override string TitleText
        {
            get
            {
                if (this.Items != null)
                    return "Inventories (" + this.Items.Count() + ")";
                return "Inventories";
            }
        }

        protected override IQueryDefinition ViewQuery
        {
            get
            {
                if (_queryDefinition == null)
                    _queryDefinition = new ItemQueryDefinition();
                return _queryDefinition;
            }
        }

        private bool CanExecuteLoadIncrementalCommand(object paramater)
        {
            return this.EnableIncrementalLoading;
        }

        private void ExecuteLoadIncrementalCommand(object parameter)
        {
            LoadDataIncremental();
        }
    }
}

Hi Zhou Wanghua

your constructor is wrong it should be: public MachineTimeViewModel(){}

namespace MyInventory.ViewModels{
    public class MachineTimeViewModel: DataListViewModelBase<Item, IItemRepository>
    {
        private ItemQueryDefinition _queryDefinition = null;

        public MachineTimeViewModel()
        {
            // configure data behaviors
            this.EnableRefresh = true;
            this.EnableIncrementalRefresh = true;
            this.EnableIncrementalLoading = true;
            this.EnableAsyncFilter = true;
            this.IncrementalLoadingSize = 20;

            // commands
            this.LoadIncrementalCommand = new DelegateCommand(ExecuteLoadIncrementalCommand,
                                                           CanExecuteLoadIncrementalCommand);
        }

        public DelegateCommand LoadIncrementalCommand
        {
            get;
            set;
        }

        public override string TitleText
        {
            get
            {
                if (this.Items != null)
                    return "Inventories (" + this.Items.Count() + ")";
                return "Inventories";
            }
        }

        protected override IQueryDefinition ViewQuery
        {
            get
            {
                if (_queryDefinition == null)
                    _queryDefinition = new ItemQueryDefinition();
                return _queryDefinition;
            }
        }

        private bool CanExecuteLoadIncrementalCommand(object paramater)
        {
            return this.EnableIncrementalLoading;
        }

        private void ExecuteLoadIncrementalCommand(object parameter)
        {
            LoadDataIncremental();
        }
    }
}

When I am through “ this.NavigationService.Navigate<MachineTimeViewModel>();”The navigation view ，not find "MachineTimeViewModel"。"DataListViewModelBase" Can be achieved by "this.NavigationService.Navigate<>"navigation ?

Hi Zhou Wanghua

I think your MachineTimeViewModel view model is already right.

That error caused because you are not yet created activity (Android) or view controller (iOS), you must link your view model to your activity  (android) or view controllor (iOS) here is the example:


If you not yet define your view model there, that error can be happened.