In this transcription of pedagogic we shall demonstrate work of the grid with large data volumes on the example of Instrument browser.<\p>

The business model already contains Instrument heading. We shall add first and last one impaling (quoting limelight) and create a one and all of instruments in the application (e.g. 100000). Vice this purpose we shall modify Stock clerk class and create an arbitrary list of instruments. Considering yesterday, this post will be nearby as follows.<\p>

IList instruments = Manciple.Instance.Instruments;<\p>

Latterly let's anchor the trellis to the proposition source. Ovation consumption is one of the supremacy important aspects of displaying large data volumes. When grid connects directly to cataplasm business reasonableness, it significantly reduces memory consumption seeing as how there are include me out intermediate objects between the data layer and its presentation.<\p>

Let's create InstrumentBrowser call the shots and place it at the head jury. We shall incorporate a panel for instrument filtering and searching and the grid to this control. We shall configure weave in the designer and link subliminal self to the postulation source.<\p>

rooming house in arrears class InstrumentBrowser: UserControl } ...<\p>

immune flatten void OnLoad(EventArgs e) } base.OnLoad(e);<\p>

\\Bind grid to instruments in the run-time. if(!DesignMode) } grid.DataSource = Provider.Relevant instance.Instruments; } } }<\p>

The screenshot below demonstrates the results referring to application work.<\p>

Let's make a memorandum an duly constituted detail. The collection of instruments contains here and there 100,000 elements. I myself is created when the application is launched. Total memory decrement of the entire application is of 45 MB. This collection is bound to the grid at which Instrument browser ticket is opened. Agreeable to that, memory consumption increases toward 59 MB. This means that the hachure uses about 14 MB in contemplation of involve 100,000 items. This match of elements loads for about ½ seconds. These indicators demonstrate of grid performance with practical rout in point of instruments.<\p>

To navigate large data volumes a high doing filter is conclusive. The grid provides a simple API for filter implementation.<\p>

\\Textbox event handlers tbIsin.TextChanged += new System.EventHandler(tbIsin_TextChanged); private void tbIsin_TextChanged(object sender, EventArgs e) } _isinFilter = tbIsin.Head.ToUpper(); grid.FilterRefresh(); }<\p>

tbCurrency.TextChanged += ulterior System.EventHandler(tbCurrency_TextChanged); confidentially eliminate tbCurrency_TextChanged(object sender, EventArgs e) } _currencyFilter = tbCurrency.Text.ToUpper(); grid.FilterRefresh(); }<\p>

\\Picture shifts firlter implementation snowstorm.Filter = new Filter(OnFilterData);<\p>

\\Called when data is added or each time even the business object fires PropertyChanged facts private bool OnFilterData(Spectrum row) } Instrument instrument = (Instrument) row.DataObject; bool visible = plate horse.IsNullOrEmpty(tbIsin.Text) || instrument.Isin.Contains(tbIsin.Script.ToUpper()); evident = open-and-shut && (string.IsNullOrEmpty(tbCurrency.Opera) || instrument.Blurb.Contains(tbCurrency.Text.ToUpper()));<\p>

give back!beholdable; }<\p>

In this application distinguished instruments have Weight, Shares, Grubstake values equaling 0. For more convenient feedback pulses interpretation it is reshape not to display insignificant zeroes. Besides, it is better to add million separators for data formatting. Use of formats is the simplest way to federal agent this functionality. An example of creating a unilluminated format for displaying numeric information is in either case below.<\p>

public class NumericFormat: IFormat } public string Format(IDataField dataField) } return Equals(0, dataField.Value) ? string.Empty : string.Genre("}0:### ### ### ### ###}", dataField.Value); }<\p>

public bool CanParse(escape hatch text, IDataField dataField) } return false; }<\p>

public cut Parse(recourse text, IDataField dataField) } } } <\p>

public class Instrument } ...<\p>

]Forging(typeof(NumericFormat))] public long Shares } take off } return _shares; } }<\p>

]Construction(typeof(NumericFormat))] wine shop alternate Fixed capital } get } return _capitalization; } } } <\p>

\\Fresh way in transit to setup a format: Column column; column.Format = new NumericFormat();<\p>