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This article mainly introduces how to use ComponentOne to improve the loading speed in .NET DataMap, which has a certain reference value. Interested friends can refer to it. I hope you can learn a lot after reading this article.

Overview

FlexGrid for WinForm uses the latest data binding technology and integrates seamlessly with Microsoft .NET Framework. As a result, you can get easy-to-use flexible grid controls to create a user-friendly interface to display, edit, format, organize, summarize, and print tabular data.

The DataMap property of FlexGrid allows you to implement "translated" rows or columns. In the converted row or column, the grid does not display the values stored in the cell. Instead, it looks for these values in the DataMap of the column and displays the mapped values.

Sometimes you may need to use DataMap in C1FlexGrid / C1FlexGridClassic to display a list of projects. Even if the list contains a large amount of data, its load is smooth and instant. In this article, we will discuss how to use a custom ComboBox editor to speed up the loading time of the DataMap grid.

Create an editor and host it in Grid

All built-in grid editors implement the IC1EmbeddedEditor interface, as do controls in the ComponentOne Input library. If we want to use a third-party editor with C1FlexGrid, we need to create a derived class and implement this interface.

Implementation steps

Create a model class MyComboItem to bind ComboBox.

Public class MyComboItem

{public int Id {get; set;} public string Display {get; set;}}

Create a custom control MyComboBox that inherits the ComboBox class and implements the IC1EmbeddedEditor interface.

Public partial class MyComboBox: ComboBox, IC1EmbeddedEditor {public MyComboBox () {InitializeComponent ();} # region IC1EmbeddedEditor-Members / / Initialize editor: select transferred value public void C1EditorInitialize (object value, IDictionary editorAttributes) {this.SelectedValue = value } / / Get value from editor public object C1EditorGetValue () {return (base.SelectedItem as MyComboItem)? .ID;} / / Value is always TRUE public bool C1EditorValueIsValid () {return true } / / Adjust editor size public void C1EditorUpdateBounds (Rectangle rc) {if (rc.Height! =-1 & & rc.Width! =-1) {this.Location = new Point (rc.X, rc.Y); this.Width = rc.Width; this.Height = this.DefaultSize.Height } else {/ / Editor has scrolled out of the picture. Take over the height / width of-1. This.Width =-1; this.Height =-1;}} / / TRUE if Escape or Enter public bool C1EditorKeyDownFinishEdit (KeyEventArgs e) {if (e.KeyCode = = Keys.Escape | | e.KeyCode = = Keys.Enter) return true; return false } / / Format and editor value public string C1EditorFormat (object value, string mask) {return null;} / / Style of Editors public UITypeEditorEditStyle C1EditorGetStyle () {return UITypeEditorEditStyle.DropDown;} # endregion}}

Create an instance of the MyComboBox class and assign it to the grid's column editor, as follows:

Dictionary DMap = new Dictionary (); ComboBox C1 = new MyComboBox (); List _ list = new List (); c1.DataSource = _ list; c1.ValueMember = "Id"; c1.DisplayMember = "Display"; _ flex.Cols [2] .Editor = C1; _ flex.Cols [2] .DataMap = DMap / / use DataMap to show IDs as values. Thank you for reading this article carefully. I hope the article "how to use ComponentOne to improve the loading speed in .NET DataMap" shared by the editor will be helpful to you. At the same time, I also hope that you will support and follow the industry information channel. More related knowledge is waiting for you to learn!

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