в 16:40, 26 мая 2010

2010-05-26T16:40:30Z

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2010-05-26T12:56:01Z

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==Bind DataTable to Control==

<source lang="vbnet">Imports System.Data
Imports System.Data.OleDb
Imports System.Windows.Forms
public class BindDataTableToControl
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class

Public Class Form1
" The data source.
Private m_ContactsTable As DataTable
" The data source"s CurrencyManager.
Private m_CurrencyManager As CurrencyManager
Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
" Make a DataTable.
m_ContactsTable = New DataTable("Contacts")
" Add columns.
m_ContactsTable.Columns.Add("FirstName", GetType(String))
m_ContactsTable.Columns.Add("LastName", GetType(String))
m_ContactsTable.Columns.Add("Street", GetType(String))
m_ContactsTable.Columns.Add("City", GetType(String))
m_ContactsTable.Columns.Add("State", GetType(String))
m_ContactsTable.Columns.Add("Zip", GetType(String))
" Make the combined FirstName/LastName unique.
Dim first_last_columns() As DataColumn = { _
m_ContactsTable.Columns("FirstName"), _
m_ContactsTable.Columns("LastName") _
}
m_ContactsTable.Constraints.Add( _
New UniqueConstraint(first_last_columns))
" Make some contact data.
m_ContactsTable.Rows.Add(New Object() {"A", "B","C", "D", "E", "11111"})
m_ContactsTable.Rows.Add(New Object() {"F", "G","H", "I", "J", "22222"})
m_ContactsTable.Rows.Add(New Object() {"K", "L","M", "N", "O", "33333"})
m_ContactsTable.Rows.Add(New Object() {"P", "Q","R", "S", "T", "44444"})
m_ContactsTable.Rows.Add(New Object() {"U", "V","W", "X", "Y", "55555"})
m_ContactsTable.Rows.Add(New Object() {"Z", "A","B", "C", "D", "66666"})
m_ContactsTable.Rows.Add(New Object() {"E", "F","G", "H", "I", "77777"})
m_ContactsTable.Rows.Add(New Object() {"J", "K","L", "M", "N", "88888"})
" Bind to controls.
txtFirstName.DataBindings.Add("Text", m_ContactsTable, "FirstName")
txtLastName.DataBindings.Add("Text", m_ContactsTable, "LastName")
txtStreet.DataBindings.Add("Text", m_ContactsTable, "Street")
txtCity.DataBindings.Add("Text", m_ContactsTable, "City")
txtState.DataBindings.Add("Text", m_ContactsTable, "State")
txtZip.DataBindings.Add("Text", m_ContactsTable, "Zip")
" Save a reference to the CurrencyManager.
m_CurrencyManager = _
DirectCast(Me.BindingContext(m_ContactsTable), CurrencyManager)
End Sub
Private Sub btnFirst_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnFirst.Click
m_CurrencyManager.Position = 0
End Sub
Private Sub btnPrev_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnPrev.Click
m_CurrencyManager.Position -= 1
End Sub
Private Sub btnNext_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnNext.Click
m_CurrencyManager.Position += 1
End Sub
Private Sub btnLast_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnLast.Click
m_CurrencyManager.Position = m_CurrencyManager.Count - 1
End Sub
" Add a new record.
Private Sub btnAdd_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnAdd.Click
m_CurrencyManager.AddNew()
End Sub
Private Sub btnDelete_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnDelete.Click
If MsgBox("Are you sure you want to delete this record?", _
MsgBoxStyle.Question Or MsgBoxStyle.YesNo, _
"Confirm Delete?") = MsgBoxResult.Yes _
Then
m_CurrencyManager.RemoveAt(m_CurrencyManager.Position)
End If
End Sub
End Class
<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
Inherits System.Windows.Forms.Form
"Form overrides dispose to clean up the component list.
<System.Diagnostics.DebuggerNonUserCode()> _
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Dispose()
End If
MyBase.Dispose(disposing)
End Sub
"Required by the Windows Form Designer
Private components As System.ruponentModel.IContainer
"NOTE: The following procedure is required by the Windows Form Designer
"It can be modified using the Windows Form Designer.
"Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> _
Private Sub InitializeComponent()
Me.Label6 = New System.Windows.Forms.Label
Me.Label5 = New System.Windows.Forms.Label
Me.Label4 = New System.Windows.Forms.Label
Me.Label3 = New System.Windows.Forms.Label
Me.Label2 = New System.Windows.Forms.Label
Me.Label1 = New System.Windows.Forms.Label
Me.btnDelete = New System.Windows.Forms.Button
Me.btnAdd = New System.Windows.Forms.Button
Me.btnLast = New System.Windows.Forms.Button
Me.btnNext = New System.Windows.Forms.Button
Me.btnPrev = New System.Windows.Forms.Button
Me.btnFirst = New System.Windows.Forms.Button
Me.txtZip = New System.Windows.Forms.TextBox
Me.txtState = New System.Windows.Forms.TextBox
Me.txtCity = New System.Windows.Forms.TextBox
Me.txtStreet = New System.Windows.Forms.TextBox
Me.txtLastName = New System.Windows.Forms.TextBox
Me.txtFirstName = New System.Windows.Forms.TextBox
Me.SuspendLayout()
"
"Label6
"
Me.Label6.AutoSize = True
Me.Label6.Location = New System.Drawing.Point(176, 104)
Me.Label6.Name = "Label6"
Me.Label6.Size = New System.Drawing.Size(22, 13)
Me.Label6.TabIndex = 35
Me.Label6.Text = "Zip"
"
"Label5
"
Me.Label5.AutoSize = True
Me.Label5.Location = New System.Drawing.Point(8, 104)
Me.Label5.Name = "Label5"
Me.Label5.Size = New System.Drawing.Size(32, 13)
Me.Label5.TabIndex = 34
Me.Label5.Text = "State"
"
"Label4
"
Me.Label4.AutoSize = True
Me.Label4.Location = New System.Drawing.Point(8, 80)
Me.Label4.Name = "Label4"
Me.Label4.Size = New System.Drawing.Size(24, 13)
Me.Label4.TabIndex = 33
Me.Label4.Text = "City"
"
"Label3
"
Me.Label3.AutoSize = True
Me.Label3.Location = New System.Drawing.Point(8, 56)
Me.Label3.Name = "Label3"
Me.Label3.Size = New System.Drawing.Size(35, 13)
Me.Label3.TabIndex = 32
Me.Label3.Text = "Street"
"
"Label2
"
Me.Label2.AutoSize = True
Me.Label2.Location = New System.Drawing.Point(8, 32)
Me.Label2.Name = "Label2"
Me.Label2.Size = New System.Drawing.Size(58, 13)
Me.Label2.TabIndex = 31
Me.Label2.Text = "Last Name"
"
"Label1
"
Me.Label1.AutoSize = True
Me.Label1.Location = New System.Drawing.Point(8, 8)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(57, 13)
Me.Label1.TabIndex = 30
Me.Label1.Text = "First Name"
"
"btnDelete
"
Me.btnDelete.Location = New System.Drawing.Point(240, 144)
Me.btnDelete.Name = "btnDelete"
Me.btnDelete.Size = New System.Drawing.Size(32, 24)
Me.btnDelete.TabIndex = 29
Me.btnDelete.Text = "X"
"
"btnAdd
"
Me.btnAdd.Location = New System.Drawing.Point(200, 144)
Me.btnAdd.Name = "btnAdd"
Me.btnAdd.Size = New System.Drawing.Size(32, 24)
Me.btnAdd.TabIndex = 28
Me.btnAdd.Text = "+"
"
"btnLast
"
Me.btnLast.Location = New System.Drawing.Point(104, 144)
Me.btnLast.Name = "btnLast"
Me.btnLast.Size = New System.Drawing.Size(32, 24)
Me.btnLast.TabIndex = 27
Me.btnLast.Text = ">>"
"
"btnNext
"
Me.btnNext.Location = New System.Drawing.Point(72, 144)
Me.btnNext.Name = "btnNext"
Me.btnNext.Size = New System.Drawing.Size(32, 24)
Me.btnNext.TabIndex = 26
Me.btnNext.Text = ">"
"
"btnPrev
"
Me.btnPrev.Location = New System.Drawing.Point(40, 144)
Me.btnPrev.Name = "btnPrev"
Me.btnPrev.Size = New System.Drawing.Size(32, 24)
Me.btnPrev.TabIndex = 25
Me.btnPrev.Text = "<"
"
"btnFirst
"
Me.btnFirst.Location = New System.Drawing.Point(8, 144)
Me.btnFirst.Name = "btnFirst"
Me.btnFirst.Size = New System.Drawing.Size(32, 24)
Me.btnFirst.TabIndex = 24
Me.btnFirst.Text = "<<"
"
"txtZip
"
Me.txtZip.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
Me.txtZip.Location = New System.Drawing.Point(200, 104)
Me.txtZip.Name = "txtZip"
Me.txtZip.Size = New System.Drawing.Size(72, 20)
Me.txtZip.TabIndex = 23
"
"txtState
"
Me.txtState.Location = New System.Drawing.Point(72, 104)
Me.txtState.Name = "txtState"
Me.txtState.Size = New System.Drawing.Size(32, 20)
Me.txtState.TabIndex = 22
"
"txtCity
"
Me.txtCity.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
Me.txtCity.Location = New System.Drawing.Point(72, 80)
Me.txtCity.Name = "txtCity"
Me.txtCity.Size = New System.Drawing.Size(200, 20)
Me.txtCity.TabIndex = 21
"
"txtStreet
"
Me.txtStreet.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
Me.txtStreet.Location = New System.Drawing.Point(72, 56)
Me.txtStreet.Name = "txtStreet"
Me.txtStreet.Size = New System.Drawing.Size(200, 20)
Me.txtStreet.TabIndex = 20
"
"txtLastName
"
Me.txtLastName.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
Me.txtLastName.Location = New System.Drawing.Point(72, 32)
Me.txtLastName.Name = "txtLastName"
Me.txtLastName.Size = New System.Drawing.Size(200, 20)
Me.txtLastName.TabIndex = 19
"
"txtFirstName
"
Me.txtFirstName.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
Me.txtFirstName.Location = New System.Drawing.Point(72, 8)
Me.txtFirstName.Name = "txtFirstName"
Me.txtFirstName.Size = New System.Drawing.Size(200, 20)
Me.txtFirstName.TabIndex = 18
"
"Form1
"
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
Me.ClientSize = New System.Drawing.Size(278, 175)
Me.Controls.Add(Me.Label6)
Me.Controls.Add(Me.Label5)
Me.Controls.Add(Me.Label4)
Me.Controls.Add(Me.Label3)
Me.Controls.Add(Me.Label2)
Me.Controls.Add(Me.Label1)
Me.Controls.Add(Me.btnDelete)
Me.Controls.Add(Me.btnAdd)
Me.Controls.Add(Me.btnLast)
Me.Controls.Add(Me.btnNext)
Me.Controls.Add(Me.btnPrev)
Me.Controls.Add(Me.btnFirst)
Me.Controls.Add(Me.txtZip)
Me.Controls.Add(Me.txtState)
Me.Controls.Add(Me.txtCity)
Me.Controls.Add(Me.txtStreet)
Me.Controls.Add(Me.txtLastName)
Me.Controls.Add(Me.txtFirstName)
Me.Name = "Form1"
Me.Text = "UseCurrencyManager"
Me.ResumeLayout(False)
Me.PerformLayout()
End Sub
Friend WithEvents Label6 As System.Windows.Forms.Label
Friend WithEvents Label5 As System.Windows.Forms.Label
Friend WithEvents Label4 As System.Windows.Forms.Label
Friend WithEvents Label3 As System.Windows.Forms.Label
Friend WithEvents Label2 As System.Windows.Forms.Label
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents btnDelete As System.Windows.Forms.Button
Friend WithEvents btnAdd As System.Windows.Forms.Button
Friend WithEvents btnLast As System.Windows.Forms.Button
Friend WithEvents btnNext As System.Windows.Forms.Button
Friend WithEvents btnPrev As System.Windows.Forms.Button
Friend WithEvents btnFirst As System.Windows.Forms.Button
Friend WithEvents txtZip As System.Windows.Forms.TextBox
Friend WithEvents txtState As System.Windows.Forms.TextBox
Friend WithEvents txtCity As System.Windows.Forms.TextBox
Friend WithEvents txtStreet As System.Windows.Forms.TextBox
Friend WithEvents txtLastName As System.Windows.Forms.TextBox
Friend WithEvents txtFirstName As System.Windows.Forms.TextBox
End Class</source>

==Data binding==

<source lang="vbnet">Public Class Form2
Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
"This call is required by the Windows Form Designer.
InitializeComponent()
"Add any initialization after the InitializeComponent() call
End Sub
"Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
"Required by the Windows Form Designer
Private components As System.ruponentModel.Container
Private WithEvents textBox1 As System.Windows.Forms.TextBox
Private WithEvents button1 As System.Windows.Forms.Button
"NOTE: The following procedure is required by the Windows Form Designer
"It can be modified using the Windows Form Designer.
"Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.textBox1 = New System.Windows.Forms.TextBox()
Me.button1 = New System.Windows.Forms.Button()
Me.SuspendLayout()
"
"textBox1
"
Me.textBox1.Location = New System.Drawing.Point(48, 56)
Me.textBox1.Name = "textBox1"
Me.textBox1.TabIndex = 0
Me.textBox1.Text = "textBox1"
"
"button1
"
Me.button1.Location = New System.Drawing.Point(56, 96)
Me.button1.Name = "button1"
Me.button1.TabIndex = 1
Me.button1.Text = "button1"
"
"Form2
"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.button1, Me.textBox1})
Me.Name = "Form2"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
#End Region
Private Sub button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles button1.Click
Dim sConnection As String = _
"Provider=SQLOLEDB.1;" & _
"Password=sqlpassword;" & _
"Persist Security Info=True;" & _
"User ID=sa;" & _
"Initial Catalog=CD;" & _
"Data Source=(local)"
Dim sSQL As String
sSQL = "SELECT ArtistID, ArtistName From Artist"
Dim objConn _
As New OleDb.OleDbConnection(sConnection)
Dim objDataAdapter _
As New OleDb.OleDbDataAdapter(sSQL, objConn)
Dim objDS _
As New DataSet("Artists")
Dim objDV _
As DataView
Try
objConn.Open()
Catch myException As System.Exception
Windows.Forms.MessageBox.Show(myException.Message)
End Try
If objConn.State = ConnectionState.Open Then
Try
objDataAdapter.Fill(objDS, "Disc")
objConn.Close()
Dim objTable As DataTable
objTable = objDS.Tables("Disc")
objDV = objTable.DefaultView
textBox1.DataBindings.Add("Text", objDV, "ArtistName")
Catch myexception As Exception
Windows.Forms.MessageBox.Show(myException.Message)
End Try
End If
End Sub
End Class</source>

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в 16:40, 26 мая 2010

Admin: 1 версия