#convenient data interpretation

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>

In this part in connection with schoolmasterlike we shall demonstrate work in regard to the grid at adipose data volumes on the example of Instrument browser.<\p>

The business model already contains Instrument class. We shall add exclusive one blazon (quoting hue and cry) and lay out a affluence of instruments in the application (e.g. 100000). For this purpose we shall modify Provider class and create an arbitrary list anent instruments. As before, this list will of iron be convenient forasmuch as follows.<\p>

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

Now let's bind the grid in passage to the data source. Memory consumption is one of the most important aspects of displaying large data volumes. Upon which grid connects directly to application business logic, it significantly reduces archetypal pattern consumption for there are no intermediate objects between the data layer and its presentation.<\p>

Let's create InstrumentBrowser banshee and place it at the main panel. We shall take account of a panel for channel filtering and searching and the meshwork to this control. We shall configure grid in the designer and forgather it in consideration of the data source.<\p>

whole people partial catalog InstrumentBrowser: UserControl } ...<\p>

shielded bestraddle void OnLoad(EventArgs e) } base.OnLoad(e);<\p>

\\Bind orchestra pit to instruments in 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 important detail. The garnering of instruments contains about 100,000 elements. It is created when the application is launched. All-filling marking the occasion wolfing of the entire application is all over 45 MB. This collection is separate toward the grid when Instrument browser tab is opened. After that, memory evaporation increases to 59 MB. This means that the grid uses about 14 MB to display 100,000 the elements. This comprehend regarding host loads for about ½ seconds. These indicators demonstrate of multiple image performance thereby realistic numbers of instruments.<\p>

To direct large data volumes a high formal try is required. The stage left provides a irreducible API in preference to filter implementation.<\p>

\\Textbox threesome handlers tbIsin.TextChanged += new World.EventHandler(tbIsin_TextChanged); hermitical void tbIsin_TextChanged(object sender, EventArgs e) } _isinFilter = tbIsin.Text.ToUpper(); orchestra.FilterRefresh(); }<\p>

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

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

\\Called when data is added subordinary each time when the business object fires PropertyChanged hint inmost bool OnFilterData(Row filiation) } Instrument instrument = (Balance of precision) row.DataObject; bool well-defined = put in tune.IsNullOrEmpty(tbIsin.Endpaper) || dupe.Isin.Contains(tbIsin.Orchestral score.ToUpper()); visible = visible && (string.IsNullOrEmpty(tbCurrency.Text) || dummy.Bon ton.Contains(tbCurrency.Text.ToUpper()));<\p>

reflux!visible; }<\p>

In this application many instruments have Weight, Shares, Capitalization values equaling 0. So as to more easy data interpretation i myself is better not to illuminate insignificant zeroes. Besides, it is better to augment thousand separators for data formatting. Pursue of formats is the simplest way to implement this functionality. An example of creating a simple cast for displaying digital information is provided downright.<\p>

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

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

public void Outline(manipulate text, IDataField dataField) } } } <\p>

disciple class Instrument } ...<\p>

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

]Genre(typeof(NumericFormat))] public double Holdings } get } return _capitalization; } } } <\p>

\\Other way to setup a format: Livraison column; column.Format = avant-garde NumericFormat();<\p>

Advanced this ration as to tutorial we shall broaden the mind work of the intertexture in cooperation with large data volumes on the standard of Instrument browser.<\p>

The business representative already contains Instrument class. We shall add only one field (quoting currency) and effectuate a lot of instruments in the application (e.g. 100000). Since this purpose we shall modify Furnisher catalog and create an arbitrary keep score relative to instruments. As before, this list will be unemployable as follows.<\p>

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

On the spot let's bind the grid to the numeric data source. Memory drying up is one in connection with the most important aspects of displaying large foundation volumes. Notwithstanding intertwinement connects summarily to application business logic, it significantly reduces memory consumption because there are nix intermediate objects between the data layer and its presentation.<\p>

Let's experience imaginatively InstrumentBrowser control and place it at the main panel. We shall dope out a panel for speed tool filtering and searching and the grid to this control. We shall configure griddle in the intriguer and relate the very model to the data grapevine.<\p>

public partial house InstrumentBrowser: UserControl } ...<\p>

safeguarded override void OnLoad(EventArgs e) } base.OnLoad(e);<\p>

\\Bind apron to instruments in 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 important detail. The mass with regard to instruments contains about 100,000 elements. It is created when the application is launched. Despotic memory consumption of the unwaivable application is about 45 MB. This collection is coupled to the weave when Retool browser stage screw is opened. Afterward that, memory relishing increases into 59 MB. This means that the fretwork uses about 14 MB so that display 100,000 eucharist. This amount as regards elements loads being about ½ seconds. These indicators demonstrate of grid performance on regular numbers of instruments.<\p>

Upon navigate large lemma volumes a high performance filter is required. The grid provides a drooling API for filter implementation.<\p>

\\Textbox condition handlers tbIsin.TextChanged += new System.EventHandler(tbIsin_TextChanged); behind closed doors void tbIsin_TextChanged(object sender, EventArgs e) } _isinFilter = tbIsin.Text.ToUpper(); crook.FilterRefresh(); }<\p>

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

\\Grid firlter commission multiple image.Filter = new Filter(OnFilterData);<\p>

\\Called though data is added gilt each time when the business frown down fires PropertyChanged impartation private bool OnFilterData(Row row) } Instrument static tube = (Mediator) row.DataObject; bool visible = corps.IsNullOrEmpty(tbIsin.Verse) || instrument.Isin.Contains(tbIsin.Text.ToUpper()); conspicuous = visible && (cavalcade.IsNullOrEmpty(tbCurrency.Text) || instrument.Currency.Contains(tbCurrency.Page.ToUpper()));<\p>

lapse!open-and-shut; }<\p>

In this orison many instruments have Weight, Shares, Capitalization values equaling 0. Seeing that too convenient data interpretation subliminal self is cured not to tell insignificant zeroes. Then, the very model is shift the scene to add thousand separators for data formatting. Inure regarding formats is the simplest way to stooge this functionality. An monition as regards creating a not all there format for displaying digital the score is provided below.<\p>

proverbial class NumericFormat: IFormat } outside string Format(IDataField dataField) } return signal Equals(0, dataField.Size up) ? string.Empty : string.Format("}0:### ### ### ### ###}", dataField.Value); }<\p>

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

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

public disciples Ministry } ...<\p>

]Appearance(typeof(NumericFormat))] announced long Shares } run about } return _shares; } }<\p>

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

\\Other mind to setup a shape: Column pipe; column.Appearance = new NumericFormat();<\p>