vb点虐 quot的简单介绍

VB.NET中标准的实体类怎么写的,请教VB高手指导

'代码来源：代码街codejie点虐

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'由于在vb点虐 里变量名不区分大小写（StuName和stuname是一样的），所以个别变量名需要修改

'在vb点虐 中,模块级变量的命名原则是以m_开头

Public Class Student

Private m_stuNo As String '学生号字段

Private m_stuName As String '学生姓名字段

Private m_stuAge As Integer '学生年龄字段

Private m_stuAddress As String '学生住址字段

'无参构造方法

Public Sub New()

End Sub

'有参构造方法

Public Sub New(ByVal stuNo As String, ByVal stuName As String, ByVal stuAge As Integer, ByVal stuAddress As String)

m_stuNo = stuNo

m_stuName = stuName

m_stuAge = stuAge

m_stuAddress = stuAddress

End Sub

'学生号属性

Public Property StuNo() As String

Get

Return m_stuNo

End Get

Set(ByVal value As String)

m_stuNo = value

End Set

End Property

'学生姓名属性

Public Property StuName() As String

Get

Return m_stuName

End Get

Set(ByVal value As String)

m_stuName = value

End Set

End Property

'学生年龄属性

Public Property StuAge() As Integer

Get

Return m_stuAge

End Get

Set(ByVal value As Integer)

m_stuAge = value

End Set

End Property

'学生住址属性

Public Property StuAddress() As String

Get

Return m_stuAddress

End Get

Set(ByVal value As String)

m_stuAddress = value

End Set

End Property

End Class

vb点虐 的数据库连接

1·绑定数据源来进行连接

2.用代码连接

先到数据库建立一个数据库和相应的表

连接数据库的代码：

Dim str As String = "Data Source=服务器名;Initial Catalog=数据库名;Persist Security Info=True;User ID=;Password="

dim conn As SqlClient.SqlConnection

try

conn = New SqlClient.SqlConnection

conn.ConnectionString = str

conn.Open()

Return True

Catch ex As Exception

MsgBox(ex.ToString)

Return False

End Try

登录代码：Dim str As String = "Data Source=服务器名;Initial Catalog=数据库名;Persist Security Info=True;User ID=;Password="

dim conn As SqlClient.SqlConnection

conn = New SqlClient.SqlConnection

conn.ConnectionString = str

conn.Open()

sqlstr = "Select * From Amd Where AmdName='" TextBox1.Text "' And AmdPwd = '" TextBox2.Text "'"

Dim sqlcmd As SqlClient.SqlCommand = New SqlClient.SqlCommand(sqlstr, conn)

Dim dr As SqlClient.SqlDataReader

dr = sqlcmd.ExecuteReader

If dr.Read = True Then '判断一条记录为真

kf.Show() '显示下个窗体

Me.Hide() ’隐藏当前窗体

Else

MessageBox.Show("输入信息有误！", "提示")

TextBox1.Text = ""

TextBox2.Text = ""

End If

vb点虐 怎样创建控件数组？

Dim Str(20) As String '20数据元素

Dim Text(20) As TextBox

Dim n As Integer = 0

For Each i In Text

i = New TextBox '实例化

i.Location = New Point(50, n * 20)

Me.Controls.Add(i) '添加窗体

Dim Index As Integer = i.TabIndex '没index属性

Str(n) = Index

i.Text = Str(n) 'str数组值赋值给文本框

n += 1

Next

VB.NET和VB"运行"时为什么VB.NET会比VB慢很多?

VB点虐 是解释型的语言`~他不直接生成*.exe文件`~ 而vb是编译和解释都具备的语言他可以直接生成*.exe大部分它是采用编译的~~~ 什么是解释~~什么是编译那? 解释就好比是吃瓜子吃一个拨一个~~ 而编译好比是吃瓜子全把它拨了在全吃~~ 所谓的吃瓜子就是也就是把语句变成机器能读取的二进制你说是全拨了在吃快哪??还是一个拨一个吃快哪??