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VB.NET中如何創(chuàng)建表示層,針對(duì)這個(gè)問(wèn)題,這篇文章詳細(xì)介紹了相對(duì)應(yīng)的分析和解答,希望可以幫助更多想解決這個(gè)問(wèn)題的小伙伴找到更簡(jiǎn)單易行的方法。
VB.NET創(chuàng)建表示層
具體步驟如下:
1. 新建一個(gè)Windows應(yīng)用程序,命名為:“Windows Form For 表示層”。
2. 在窗體上添加一個(gè)DataGrid,一個(gè)Button,Button1的text為“Load”,作用是:從業(yè)務(wù)層讀取數(shù)據(jù)。
3. 在解決方案窗體中添加Web 引用,將我們自己建立的Web Service for 業(yè)務(wù)層引入到當(dāng)前項(xiàng)目中。
4. 向Button1的Click事件添加如下代碼:
Dim Customer_Ds As New localhost.super_ds() Dim ser1 As New localhost.Service1() Customer_Ds.Merge(ser1.Get_Dataset) DataGrid1.DataSource = Customer_Ds
這里我們調(diào)用了Web Service的Get_DataSet函數(shù),Update_DataSet方法的調(diào)用與此完全相同。
VB.NET創(chuàng)建表示層的完整代碼如下:
Public Class Form1
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
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents Button2 As System.Windows.Forms.Button
Friend WithEvents Button3 As System.Windows.Forms.Button
Friend WithEvents Client_DataSet As Data_Access_表示層。localhost.super_ds
Friend WithEvents DataGrid1 As System.Windows.Forms.DataGrid
'Required by the Windows Form Designer
Private components As System.ComponentModel.Container
'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.
Private Sub InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button()
Me.Button2 = New System.Windows.Forms.Button()
Me.Button3 = New System.Windows.Forms.Button()
Me.Client_DataSet = New Data_Access_表示層。localhost.super_ds()
Me.DataGrid1 = New System.Windows.Forms.DataGrid()
CType(Me.Client_DataSet,System.ComponentModel.ISupportInitialize)。BeginInit()
CType(Me.DataGrid1, System.ComponentModel.ISupportInitialize)。BeginInit()
Me.SuspendLayout()
'Button1
Me.Button1.Location = New System.Drawing.Point(88, 360)
Me.Button1.Name = "Button1"
Me.Button1.TabIndex = 0
Me.Button1.Text = "load"
'Button2
Me.Button2.Location = New System.Drawing.Point(232, 360)
Me.Button2.Name = "Button2"
Me.Button2.TabIndex = 1
Me.Button2.Text = "update"
'Button3
Me.Button3.Location = New System.Drawing.Point(376, 360)
Me.Button3.Name = "Button3"
Me.Button3.TabIndex = 2
Me.Button3.Text = "clear"
'Client_DataSet
Me.Client_DataSet.DataSetName = "Client_DataSet"
Me.Client_DataSet.Locale = New System.Globalization.CultureInfo("zh-CN")
Me.Client_DataSet.Namespace = "http://www.tempuri.org/CustomerDs.xsd"
'DataGrid1
Me.DataGrid1.DataMember = ""
Me.DataGrid1.Location = New System.Drawing.Point(40, 56)
Me.DataGrid1.Name = "DataGrid1"
Me.DataGrid1.Size = New System.Drawing.Size(480, 264)
Me.DataGrid1.TabIndex = 3
'Form1
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
Me.ClientSize = New System.Drawing.Size(568, 429)
Me.Controls.AddRange(New System.Windows.Forms.Control()
{Me.DataGrid1, Me.Button3, Me.Button2, Me.Button1})Me.Name = "Form1"
Me.Text = "Form1"
CType(Me.Client_DataSet, System.ComponentModel.ISupportInitialize)。EndInit()
CType(Me.DataGrid1,System.ComponentModel.ISupportInitialize)。EndInit()
Me.ResumeLayout(False)
End Sub
#End Region
Private Sub Button1_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles Button1.ClickDim Customer_Ds As New localhost.super_ds()
Dim ser1 As New localhost.Service1()
Customer_Ds.Merge(ser1.Get_Dataset)
DataGrid1.DataSource = Customer_Ds
End Sub
End Class
表示層窗體上完全沒(méi)有數(shù)據(jù)庫(kù)連接控件,它與數(shù)據(jù)庫(kù)的連接任務(wù)是通過(guò)業(yè)務(wù)層來(lái)完成的,這樣,程序的結(jié)構(gòu)更加清晰,當(dāng)然業(yè)務(wù)層的實(shí)現(xiàn)也可以用其他方法,比如:寫(xiě)一個(gè)自己的類來(lái)完成與數(shù)據(jù)庫(kù)的數(shù)據(jù)傳輸。
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