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LP TRNH C S D LIU

Bi 6:

DataGrid v DataBindings

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09/07/08 Lp trnh CSDL vi Vb.net & SQL 2

Ni dung

iu khin DataGrid

nh dng iu khin TextBox vo DataGrid

nh dng iu khin CheckBox vo DataGrid iu hng d liu (s dng DataBindings)

Bi tp tng hp

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ADO.NETGii thiu chung DataGrid

Hin th d liu: Ngun d liu hin th trn

DataGrid thng l Dataset, DataTable, DataView

hay t 1 file XML hin th d liu ta dng lnh:

TnDataGrid.DataSource= Tn ngun

nh dng cho DataGrid ta s dng thuc tnhTableStyles

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L i tng rt hay dng trong vic hin th vnhp s liu

Mt s thuc tnh cn nh

Name AlternatingBackColor CaptionText DataSource ReadOnly TableStyle Item, CurrentCell

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V d v hin th d liuTry

If mycon.State = ConnectionState.Closed Thenmycon.Open()

End IfDasv.Fill(dt) in d liu vo DataTable

Catch ex As ExceptionMsgBox(Err.Number & " " & Err.Description)

End TryWith DataGrid1 .DataSource = dtgn ngun DL cho Grid

.AllowSorting = TrueEnd With

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nh dng DataGrid Thay i rng ca cc ct trong Grid Thay i mu nn ca tng hng d liu Thay i cc thuc tnh khc nh: Ch c, Tiu

ca ct, mu ca li, Thm cc i tng nh: ComboBox, TextBox,

CheckBox vo Grid S dng i tng DataGridTableStyle

thit lp nh dng cho DataGrid

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V d v nh dng DataGridDim St As New DataGridTableStyle

With St

.HeaderForeColor = Color.Red

.SelectionBackColor = Color.Gray

.ReadOnly = True

.AlternatingBackColor = Color.Bisque

End With

DataGrid1.TableStyles.Clear()

DataGrid1.TableStyles.Add(St)

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ADO.NETV d v TextBox DataGrid

Dim StC As New DataGridTableStyleDim dc As New DataColumnFor Each dc In dt.Columns

Dim txt As New DataGridTextBoxColumnWith txt

.MappingName = dc.ColumnNameIf dc.ColumnName = "HotenSv" Then

.Width = 120

.ReadOnly = False

.TextBox.BackColor = Color.RedEnd If.HeaderText = dc.ColumnName 'Gn tn cho cc ct

End WithStC.GridColumnStyles.Add(txt)

NextDataGrid1.TableStyles.Add(StC) DataGrid1.TableStyles.Clear()

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ADO.NETV d v CheckBox DataGrid

Dim StC As New DataGridTableStyleDim dc As New DataColumnFor Each dc In dt.Columns

If dc.ColumnName = "Gioitinh" Then 'Thit lp CheckboxDim txt As New DataGridBoolColumnWith txt

.MappingName = dc.ColumnName

.HeaderText = dc.ColumnName 'Gn tn cho cc ct

.ReadOnly = False

.FalseValue = 0.TrueValue = 1End WithStC.GridColumnStyles.Add(txt)

ElseDim txt1 As New DataGridTextBoxColumnWith txt

.MappingName = dc.ColumnName.ReadOnly = True

.HeaderText = dc.ColumnName 'Gn tn cho cc ctEnd WithStC.GridColumnStyles.Add(txt1)

End IfNext

DataGrid1.TableStyles.Clear()DataGrid1.TableStyles.Add(StC)

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ADO.NETiu hng d liu - Navigation

VB.net cung cp i tng BindingManagerBase qun l

ngun d liu lin kt, cho php thc hin iu hng d

liu

S dng BindingManagerBase: Np ngun d liu vo i tng

Dim Bmb as BindingManagerBase khai bo i tng

Bmb=Me.BindingContext(Dt) Dt l DataTable d liu

Di chuyn cc bn ghi

Bmb.Position=0 chuyn v bn ghi u tin

Bmb.Position=Dt.Rows.Count-1 bn ghi cui cng

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