Favor object collections for large data collections in .NET framework

Make Code 128B in .NET framework Favor object collections for large data collections
Favor object collections for large data collections
Code 128C Generator In Visual Studio .NET
Using Barcode printer for .NET Control to generate, create Code 128A image in .NET framework applications.
This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks
USS Code 128 Decoder In Visual Studio .NET
Using Barcode reader for .NET Control to read, scan read, scan image in VS .NET applications.
Object collections that are easily defined using the generic collections in NET 20 are inherently lighterweight and perform better than storing your data in a data set Typed data sets are a great way to go for smaller sets of data, particularly when you need to support updates, inserts, and deletes But for simply presenting a large collection of data, you will pay a significant performance and memory cost for using a data set compared to a custom object collection
Barcode Maker In .NET Framework
Using Barcode creator for Visual Studio .NET Control to generate, create barcode image in .NET applications.
Choosing Data Sets or Custom Collections
Bar Code Decoder In VS .NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in VS .NET applications.
When you are dealing with very large collections of data in memory like the one in Listing 62, one of your primary concerns should be memory impact Based on the other samples presented in this book so far, you may be inclined to use a typed data set as your data collection object However, you should think twice before doing this Even though improvements in the DataSet class (and therefore derived typed data set classes) in NET 20 significantly improve its scalability and performance for large data sets, the DataSet class is still a fairly heavyweight object because of all the hierarchical, change tracking, and updating capability that is built into a data set If you are thinking of presenting millions of rows of data in a grid, and you expect to let users edit the rows in the grid and let the data set updating capabilities propagate those changes back to your data store, then the DataSet class may actually be what you need However, I would discourage you from designing your application this way Displaying large collections of data should be a special use case that focuses on presentationyou are just letting the user scroll through large numbers of rows to locate a data item of interest If you need to support editing of those data items, I suggest you send the user to a different form for editing However, you can let them edit the values in the grid without needing the extra overhead of a data set, as described shortly Object collections like the List<T> generic collection are significantly more lightweight than a data set and result in less memory consumption and quicker construction times If you are going to cache a large collection in memory, you should try to design the form to use a lightweight object collection to cache the values for display only
Make Code 128 Code Set A In C#
Using Barcode creator for .NET framework Control to generate, create Code 128 image in .NET applications.
Initializing the Grid
Code 128 Code Set A Creation In Visual Studio .NET
Using Barcode encoder for ASP.NET Control to generate, create Code 128A image in ASP.NET applications.
After the data is initialized, the constructor calls theInitGrid helper method, which does the following:
Code 128 Code Set A Maker In VB.NET
Using Barcode generation for Visual Studio .NET Control to generate, create USS Code 128 image in VS .NET applications.
Sets the grid into virtual mode Turns off editing, adding, and deleting Adds three text box columns to the grid by setting the ColumnCount property Adds one row to the grid as a template Uses the AddCopies method on the Rows collection to add one million more rows This method also contains a commented-out line of code that can be used to change the VirtualMode download sample to be data bound against the object collection so that you can see the difference in load time and memory footprint
Code128 Creator In Visual Studio .NET
Using Barcode maker for .NET framework Control to generate, create Code-128 image in Visual Studio .NET applications.
This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks
Barcode Encoder In Visual Studio .NET
Using Barcode printer for VS .NET Control to generate, create barcode image in Visual Studio .NET applications.
After that, Windows Forms event handling takes over for the rest of the application lifecycle Because the grid was set to virtual mode, the next thing that happens is the OnCellValueNeeded handler will start to get called for each cell that is currently displayed in the grid This method is coded to extract the appropriate value from the data collection based on the row index and column index of the cell that is being rendered for the first two columns For the third column, it actually computes the value of the cell on the fly, using the Random class to generate random numbers It also sets a flag in the m_Visited collectionyou can use this to see how many rows are actually being rendered when users scroll around with the application running
EAN / UCC - 13 Creator In Visual Studio .NET
Using Barcode printer for Visual Studio .NET Control to generate, create EAN-13 Supplement 5 image in .NET framework applications.
EAN / UCC - 13 Creator In VS .NET
Using Barcode printer for .NET Control to generate, create GTIN - 128 image in .NET framework applications.
GTIN - 12 Recognizer In .NET
Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET applications.
Data Matrix 2d Barcode Scanner In Visual Studio .NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in .NET framework applications.
ECC200 Generator In .NET
Using Barcode drawer for ASP.NET Control to generate, create Data Matrix image in ASP.NET applications.
Code 39 Reader In .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in VS .NET applications.