chapter 8_databound controls

8/3/2019 Chapter 8_databound Controls

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Chapter 8

Implementing Data-Bound Controls


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Chapter 8

Lesson 1: Creating a Data-Bound Form withthe Data Sources Wizard

Lesson 2: Implementing Data-BoundControlsLesson 3: Working with the DataGridView


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Lesson 1: Creating a Data-Bound Formwith the Data Sources Wizard

What is Data-Bound controls? Bound and Un-Bound mode

Data-bound controls are WinForms controls those caneasily bind with data components: DataGrid, ListBox, and aComboBox

have properties, which you can set as a data componentand theyre ready to present your data in WinForms:DataSource,DisplayMember, DataMember.

Dataset (Rows)

ID, Name

Dataset (Rows)

Dataset (Rows)

Dataset (Rows)

Dataset (Rows)Position???


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Lesson 1: Creating a Data-Bound Formwith the Data Sources Wizard

DEMO Creating a Data-Bound Windows Form

Ex p411


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BinDingSource

Track record position MoveNext, MovePrevious

Change data in datasource Add, Delete, EndEdit

Dataset (Rows)ID, Name Dataset (Rows)Dataset (Rows)Dataset (Rows)

Dataset (Rows)

BindinhSource


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Lesson 2: Implementing Data-BoundControls

Binding Controls to Data Simple data binding: displaying a single

elementBindingSource productsBindingSource = NewBindingSource(NorthwindDataSet1,Products");

TextBox1.DataBindings.Add("Text",productsBindingSource, "ProductName");


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Binding Controls to Data Complex data binding: binding a control to more

than one source of data

BindingSource customersBindingSource=NewBindingSource(NorthwindDataSet1, "Customers");DataGridView1.DataSource = customersBindingSource;

Or DataGridView1.DataSource = NorthwindDataSet1;DataGridView1.DataMember = "Customers;


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Navigating Records in a DataSet use a BindingNavigator component.

Assign the BindingNavigator.BindingSourceproperty to BindingSource component


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Lesson 3: Binding withListbox/Combobox

Using unBound-mode Add items manually

Using bound-mode Single table Two tables

Core properties Datasource DataMember Displaymember ValueMember

SeletectedValue

BindingSource

Example


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Binding with single table DataSource

DisplayMember ValueMember

Return value: SelectedValue

Text


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Binding with 2 tables DataSource

DisplayMember ValueMember

Binding with SelectedValue


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Lesson 3: Working with theDataGridView

Configuring DataGridView Columns


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Adding Columns to a DataGridView Wizard (design time)

Adding Columns to a DataGridView (p428) Dim ProductNameColumn As New

DataGridViewTextBoxColumn ProductNameColumn.Name = "ProductName" ProductNameColumn.HeaderText = "Product Name" ProductNameColumn.ValueType =

System.Type.GetType("System.String") DataGridView1.Columns.Add(ProductNameColumn)


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Determining the Clicked Cell inDataGridView

use the DataGridView.CurrentCell propertyDim CurrentCellValue As StringCurrentCellValue =CustomersDataGridView.CurrentCell.Value.ToString


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ErrorText proerty of row and cell in rowValidating Input in the DataGridView

handle the DataGridView .CellValidating eventand cancel the edit if the value fails validation (israised when a cell loses focus.)


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Format a DataGridView Using Styles DefaultCellStyle

AlternatingRowsDefaultCellStyleLab: Working with the DataGridView Page 431

chapter 8_databound controls

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