data-virtualization | 易学教程

Problems Setting FlipView Items source using Data Virtualization

阅读更多关于 Problems Setting FlipView Items source using Data Virtualization

问题 This is a follow up from my previous question (UWP Problems Setting GridView Items source using x:Bind). In that case I was using the random access file data source from Mirosoft's Data virtualization sample and the grid was never being populated. The problem there was that I was not raising the property changed event. The grid now works well. My problem now is that instead of a grid view I am trying to use the data source in a flip view control. The data source does get initialized, the

Problems Setting FlipView Items source using Data Virtualization

阅读更多关于 Problems Setting FlipView Items source using Data Virtualization

WPF DataGrid loses virtualization when sorted by specific columns

阅读更多关于 WPF DataGrid loses virtualization when sorted by specific columns

问题 I am using a WPF DataGrid that is bound to a custom ItemsSource that implements IList (and NOT IEnumerable). The custom ItemsSource performs data virtualization and only loads pages of items as needed. MyDataGrid actually inherits from DataGrid and overrides the handling of the DataGrid sort methods so that I can maintain data virtualization while sorting. I have UI Virtualization turned on for MyDataGrid. When I run the application, MyDataGrid displays just fine, tells me I have roughly 20

How to time ListBox load time WPF

阅读更多关于 How to time ListBox load time WPF

问题 I'm playing around with DataVirtualization and Async. What are some options I have for quantifying load times of a ListBox that I'm binding my virtualized data collections to? I need a way to compare the virtualized vs non-virtualized data loading. Have been unsuccessful in locating any resources for this topic. Should I just put a stopwatch on the ListBox_Loaded event in the code behind? Thanks in advance! 回答1: You can use a System.Diagnostics.Stopwatch for this. Make sure that you start it

How to get (programatically) the location of a Windows UAC virtualized file?

阅读更多关于 How to get (programatically) the location of a Windows UAC virtualized file?

问题 I have a 32-bit windows old application (with the C/Win32 source) that creates its data file in the same folder where the executable is. Because the application has no installation program and the user can place the executable wherever he/she wants, the application has a dialog to inform the user where its data is located. But under Microsoft Vista/Seven if the user puts the application in the Program Files or any other system-protected folder the data file gets virtualized and moved to a

Detecting scrolling to the end of listbox

阅读更多关于 Detecting scrolling to the end of listbox

问题 I have a large list of items, so i should request corresponding page from the server. How to catch an event, when user scrolls to the end of the listbox, so i can request another page? 回答1: The exact solutions you are looking for: http://danielvaughan.orpius.com/post/Scroll-Based-Data-Loading-in-Windows-Phone-7.aspx 回答2: You're thinking about data virtualization. Shawn Oster wrote a really good explanation to this here. To sum it up, it's not the ListBox that is managing your data, but your

Using Data Virtualization, the problem of binding a property in ViewModel with SelectedItem of ItemsControl in View

阅读更多关于 Using Data Virtualization, the problem of binding a property in ViewModel with SelectedItem of ItemsControl in View

问题 About Data Virtualizatoin in WPF, the WPF: Data Virtualization is a good article. With using this, Data Virtualization was executed as good in my code but there is the one problem, which is that I cannot bind a property in ViewModel with SelectedItem of ItemsControl in View. If one item of data satisfies some condition while data loads, the one item will be set as a property in ViewModel and then it will be bound with SelectedItem of ItemsControl in View, but will not. My code about this is

DataGrid row request patterns with data virtualization

阅读更多关于 DataGrid row request patterns with data virtualization

问题 I implemented a data virtualization solution using some ideas from CodePlex and the blog of Bea Stollnitz and Vincent Da Ven Berhge's paper (same link). However I needed a different approach so I decided to write my own solution. I am using a DataGrid to display about a million rows with this solution. I am using UI virtualization as well. My solution is feasible, but I experience some weird behavior in certain situations on how the DataGrid requests data from its source. About the solution I

Using Data Virtualization, the problem of binding a property in ViewModel with SelectedItem of ItemsControl in View

阅读更多关于 Using Data Virtualization, the problem of binding a property in ViewModel with SelectedItem of ItemsControl in View

About Data Virtualizatoin in WPF, the WPF: Data Virtualization is a good article. With using this, Data Virtualization was executed as good in my code but there is the one problem, which is that I cannot bind a property in ViewModel with SelectedItem of ItemsControl in View. If one item of data satisfies some condition while data loads, the one item will be set as a property in ViewModel and then it will be bound with SelectedItem of ItemsControl in View, but will not. My code about this is the following. About the types of IItemsProvider andVirtualizingCollection, please refer to the WPF:

DataGrid row request patterns with data virtualization

阅读更多关于 DataGrid row request patterns with data virtualization

I implemented a data virtualization solution using some ideas from CodePlex and the blog of Bea Stollnitz and Vincent Da Ven Berhge's paper (same link). However I needed a different approach so I decided to write my own solution. I am using a DataGrid to display about a million rows with this solution. I am using UI virtualization as well. My solution is feasible, but I experience some weird behavior in certain situations on how the DataGrid requests data from its source. About the solution I ended up writing a list which does all the heavy work. It is a generic class named VirtualList<T>. It