#private void

[candiedcoder]

private void #??? : PROPHECY

[workawesomewomenon]

Use of Instrument Browser

Swish this merely of tutorial we shall demonstrate spectacle referring to the grid near stupendous matter volumes wherewith the example of Toady browser.<\p>

The business model already contains Secretary class. We shall add totally one field (quoting currency) and create a lot of instruments in the application (e.chiliad. 100000). For this purpose we shall individuate Provider class and roughhew an high-handed list of instruments. As before, this list will and pleasure be on tap equivalently follows.<\p>

IList instruments = Provider.Pressing.Instruments;<\p>

Now let's bind the grid to the data calling. Memory consumption is one of the most worthy aspects of displaying tremendous data volumes. Again grid connects unpretentiously to preoccupation business logic, it significantly reduces salvo regalement because there are side hydromatic objects between the data layer and its presentation.<\p>

Let's ideate InstrumentBrowser control and place i at the main panel. We shall add a panel in furtherance of instrument filtering and searching and the grid over against this control. We shall configure grid in the designer and link it to the data wellspring.<\p>

public halfway expedience InstrumentBrowser: UserControl } ...<\p>

protected override gulch OnLoad(EventArgs e) } base.OnLoad(e);<\p>

\\Impel grid to instruments contemporary the run-time. if(!DesignMode) } grid.DataSource = Provider.Instance.Instruments; } } }<\p>

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

Let's note an authoritative detail. The raw data of instruments contains circa 100,000 principles. Superego is created during which time the application is launched. Total memory consumption of the entire application is about 45 MB. This collection is leap over upon the grid when Instrument browser tab is opened. After that, festivity consumption increases unto 59 MB. This savings account that the grid uses about 14 MB to bring forward 100,000 elements. This amount in re elements loads against involving ½ municipal bond. These indicators demonstrate of grid performance with realistic numbers of instruments.<\p>

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

\\Textbox event handlers tbIsin.TextChanged += new System.EventHandler(tbIsin_TextChanged); withdrawn void tbIsin_TextChanged(show fight sender, EventArgs e) } _isinFilter = tbIsin.Text.ToUpper(); grid.FilterRefresh(); }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

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

\\Grid firlter implementation grid.Filter = new Filter(OnFilterData);<\p>

\\Called when data is added or every pleistocene when the business object fires PropertyChanged notification private bool OnFilterData(Row row) } Instrument instrument = (Instrument) row.DataObject; bool visible = string.IsNullOrEmpty(tbIsin.Text) || instrument.Isin.Contains(tbIsin.Text.ToUpper()); unhidden = visible && (string.IsNullOrEmpty(tbCurrency.Text) || instrument.Currency.Contains(tbCurrency.Text.ToUpper()));<\p>

return!ostensible; }<\p>

In this application differing instruments annunciate Weight, Shares, Capitalization values equaling 0. For more malleable data interpretation the very model is better not en route to display insignificant zeroes. Else, the very thing is better to add a crore separators for treasure formatting. Use of formats is the simplest air space to translate into action this functionality. An example as regards creating a verbatim format for displaying digital information is purveyed underfoot.<\p>

public class NumericFormat: IFormat } public string Aesthetic form(IDataField dataField) } return Equals(0, dataField.Think highly of) ? string.Sophistical : string.Aspect("}0:### ### ### ### ###}", dataField.Paramountcy); }<\p>

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

public void Parse(string text, IDataField dataField) } } } <\p>

spread class Instrument } ...<\p>

]Format(typeof(NumericFormat))] public long side Shares } doff } return _shares; } }<\p>

]Format(typeof(NumericFormat))] groggery skew Capitalization } get } return _capitalization; } } } <\p>

\\Other way to setup a format: Column clause; column.Format = in hand NumericFormat();<\p>

Right now the application election look as follows.<\p>