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vb.net插入一行 vbnet foreach

如何在vb.net中的DataGrid中增加一空白行

VS中的DataGridView控件,在机房重构里的出镜率还是很高哒~这篇博客就把一些有关DataGridView

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控件的一些使用细节和大家分享一下!

找到控件:

                

绑定数据源

选中行数代码实现:

DataGridView1.SelectedRows.Count

以增加删除用户窗体中的删除所选行数代码为例:

[vb] view plain copy

Private Sub btnDeleteUser_Click(sender As Object, e As EventArgs) Handles btnDeleteUser.Click

'判断下拉表中是否选择了用户类型

If cmbUserLevel.SelectedItem = "" Then

MsgBox("如需删除用户,请先选择用户类型!", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)

End If

Dim K As Integer = DataGridView1.SelectedRows.Count

Dim FFacade As New Facade.DeleteUserFacade

Dim Uuser As New Entity.AddDeleteUserInfo

Dim strResult As Boolean

'strResult = FFacade.DeleteUserinfo(Uuser)

If DataGridView1.SelectedRows.Count  0 Then '如果选中的行数大于0

For i As Integer = K To 1 Step -1

'获取控件的第N行的第一列数据,得到用户ID,以用户ID为主键来删除整行数据

Dim userinfo As String = DataGridView1.SelectedRows(i - 1).Cells("UserID").Value.ToString

'删除的数据不能为当前登录的用户,需要判断用户ID

If Entity.Share.ID.Trim = userinfo Then

MsgBox("您无法删除当前登录的用户!", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)

Else

Uuser.UserID = userinfo

End If

strResult = FFacade.DeleteUserinfo(Uuser)

'If FFacade.DeleteUserinfo(Uuser) Then

If strResult = True Then

'删除选中行

DataGridView1.Rows.RemoveAt(DataGridView1.SelectedRows(i - 1).Index)

MsgBox("数据删除成功!", MessageBoxButtons.OK, MessageBoxIcon.Information)

End If

Next

Else '如果选中的行数不大于0

MsgBox("请您选中所要删除的行!", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)

'DataGridView1.Rows.Clear()

End If

End Sub

运行图:

常用属性:

1.想把Datagridview的第一行隐藏。     Idea:把RowHeadersVisible属性改为False就可以。

2.DataGridview显示出datatable之后,最后一行有空白行怎么去掉?

Idea:修改AllowUserToAddRow属性为False。

我想在vb.net的textbox里调用sql表中的数据,怎么办?

分类: 电脑/网络 程序设计 其他编程语言

解析:

Visual Basic.NET快速开发MIS系统

【摘 要】 本文介绍微软最新技术Visual Basic.NET在数据库开发方面的应用。结合数据库系统开发的知识,介绍了物理表操作的方法,利用Visual Basic.NET的面向对象的特征,利用类的继承知识,简化了数据库系统开发过程。

引言

以前版本的Visual Basic虽然号称自己是一种OOP(面向对象)编程语言,但却不是一个地地道道的OOP编程语言,最多只是半个面向对象的编程语言。但Visual Basic.NET已经是一种完全的面向对象的编程语言。他支持面向对象的所有基本特征:继承、多态和重载。这使得以前在Visual Basic中很难或根本实现不了的问题,在Visual Basic.NET中可以顺利的用简单的方法实现。

自定义数据操作类

定义一个数据访问的基类,并编写有关数据库操作的必要方法。

定义一个数据访问类,类名为CData。定义连接Oracle数据库的方法ConnOracle,获取数据集的方法GetDataSet, 获取物理表的方法GetDataTable, 向物理表中插入一行数据的方法Insert, 向物理表中删除数据的方法Delete, 向物理表中更新数据的方法Update。其实现方法不是本文的重点,在此仅给出代码,不作详细分析。代码如下:

Public Class CDataBase

Dim OleCnnDB As New OleDbConnection()

@#连接Oracle数据库,ServerName:服务器名,UserId:用户名,UserPwd:用户密码

Public Function ConnOracle(ByVal ServerName As String, ByVal UserId As String, ByVal UserPwd As String) As OleDbConnection

Dim OleCnnDB As New OleDbConnection()

With OleCnnDB

.ConnectionString = "Provider=MSDAORA.1;Password=@#" UserPwd "@#;User ID=@#" UserId "@#;Data Source=@#" ServerName "@#"

Try

.Open()

Catch er As Exception

MsgBox(er.ToString)

End Try

End With

mOleCnnDB = OleCnnDB

Return OleCnnDB

End Function

@#获取数据集。TableName:表名,strWhere:条件

Public Overloads Function GetDataSet(ByVal TableName As String, ByVal strWhere As String) As DataSet

Dim strSql As String

Dim myDataSet As New DataSet()

Dim myOleDataAdapter As New OleDbDataAdapter()

myOleDataAdapter.TableMappings.Add(TableName, TableName)

strSql = "SELECT * FROM " TableName " where " strWhere

myOleDataAdapter.SelectCommand = New OleDbCommand(strSql, mOleCnnDB)

Try

myOleDataAdapter.Fill(myDataSet)

Catch er As Exception

MsgBox(er.ToString)

End Try

Return myDataSet

End Function

@#获取物理表。TableName:表名

Public Overloads Function GetDataTable(ByVal TableName As String) As DataTable

Dim myDataSet As New DataSet()

myDataSet = GetDataSet(TableName)

Return myDataSet.Tables(0)

End Function

@#获取物理表。TableName:表名,strWhere:条件

Public Overloads Function GetDataTable(ByVal TableName As String, ByVal strWhere As String) As DataTable

Dim myDataSet As New DataSet()

myDataSet = GetDataSet(TableName, strWhere)

Return myDataSet.Tables(0)

End Function

@#向物理表中插入一行数据。TableName:表名,Value:行数据,BeginColumnIndex:开始列

Public Overloads Function Insert(ByVal TableName As String, ByVal Value As Object, Optional ByVal BeginColumnIndex As Int16 = 0) As Boolean

Dim myDataAdapter As New OleDbDataAdapter()

Dim strSql As String

Dim myDataSet As New DataSet()

Dim dRow As DataRow

Dim i, len As Int16

strSql = "SELECT * FROM " TableName

myDataAdapter.SelectCommand = New OleDbCommand(strSql, mOleCnnDB)

Dim custCB As OleDbCommandBuilder = New OleDbCommandBuilder(myDataAdapter)

myDataSet.Tables.Add(TableName)

myDataAdapter.Fill(myDataSet, TableName)

dRow = myDataSet.Tables(TableName).NewRow

len = Value.Length

For i = BeginColumnIndex To len - 1

If Not (IsDBNull(Value(i)) Or IsNothing(Value(i))) Then

dRow.Item(i) = Value(i)

End If

Next

myDataSet.Tables(TableName).Rows.Add(dRow)

Try

myDataAdapter.Update(myDataSet, TableName)

Catch er As Exception

MsgBox(er.ToString)

Return False

End Try

myDataSet.Tables.Remove(TableName)

Return True

End Function

@#更新物理表的一个字段的值。strSql:查询语句,FieldName_Value:字段及与对应的值

Public Overloads Sub Update(ByVal strSql As String, ByVal FieldName_Value As String)

Dim myDataAdapter As New OleDbDataAdapter()

Dim myDataSet As New DataSet()

Dim dRow As DataRow

Dim TableName, FieldName As String

Dim Value As Object

Dim a() As String

a = strSql.Split(" ")

TableName = a(3)

a = FieldName_Value.Split("=")

FieldName = a(0).Trim

Value = a(1)

myDataAdapter.SelectCommand = New OleDbCommand(strSql, mOleCnnDB)

Dim custCB As OleDbCommandBuilder = New OleDbCommandBuilder(myDataAdapter)

myDataSet.Tables.Add(TableName)

myDataAdapter.Fill(myDataSet, TableName)

dRow = myDataSet.Tables(TableName).Rows(0)

If Value Nothing Then

dRow.Item(FieldName) = Value

End If

Try

myDataAdapter.Update(myDataSet, TableName)

myDataSet.Tables.Remove(TableName)

Catch er As Exception

MsgBox(er.ToString)

End Try

End Sub

@#删除物理表的数据。TableName:表名,strWhere:条件

Public Overloads Sub Delete(ByVal TableName As String, ByVal strWhere As String)

Dim myReader As OleDbDataReader

Dim myCommand As New OleDbCommand()

Dim strSql As String

strSql = "delete FROM " TableName " where " strWhere

myCommand.Connection = mOleCnnDB

myCommand.CommandText = strSql

Try

myReader = myCommand.ExecuteReader()

myReader.Close()

Catch er As Exception

MsgBox(er.ToString)

End Try

End Sub

End Class

定义一操作数据库中物理表的类CData,此类继承CDataBase,即:

Public Class CData:Inherits CDataBase

此类应该由供用户提供所操作的物理表的表名,指定了表名就可取得该表的所有性质。该表主要完成插入、删除、更新功能。定义其属性、方法如下:

申明类CData的变量:

@#所要操作的表名

Private Shared UpdateTableName As String

@#所要操作的表对象

Public Shared UpdateDataTable As New DataTable()

@#对应表的一行数据197

Public Shared ObjFields() As Object

@#表的字段数

Public Shared FieldCount As Int16

@#主关键字。我们假设每个物理表都有一个主关键字字段fSystemID

Public Shared SystemID As String

说明:Shared 关键字指示一个或多个被声明的编程元素将被共享。共享元素不关联于某类或结构的特定实例。可以通过使用类名或结构名称或者类或结构的特定实例的变量名称限定共享元素来访问它们。

申明类CData的属性UpdateTable,当向UpdateTable赋给了一个已知表的表名,就可确定表的字段数,定义出数据行。这里,先打开表,再重新定义数据行.

Public Property UpdateTable() As String

Get

UpdateTable = UpdateTableName

End Get

Set(ByVal Value As String)

UpdateTableName = Value.Trim

UpdateDataTable = DB.GetDataTable(UpdateTableName)

UpdateTableFieldNames = UpdateDataTable.Clone

FieldCount = UpdateDataTable.Columns.Count

ReDim ObjFields(FieldCount - 1)

End Set

End Property

@#删除由主关键值fSystemID指定的数据行

Public Sub Delete()

Dim strSQL As String

strSQL = "Delete from " UpdateTableName " where fSystemID=" SystemID

DB.Delete(strSQL)

UpdateDataTable.Rows.Remove(GetRow)

End Sub

@#向表UpdateTableName中插入一行数据。数据由ObjFields给出

Public Function Insert() As Boolean

DB.Insert(UpdateTableName, ObjFields)

End Function

@#更新表UpdateTableName所指定的行

Public Shadows Sub Update()

Dim SetField As String

Dim i As Int16

For i = 1 To FieldCount - 1

SetField = UpdateTableFieldNames.Columns(i).ColumnName "=" ObjFields(i)

UpdateField(SetField)

Next

End Sub

Public Sub UpdateField(ByVal SetField As String)

Dim StrSQL As String

StrSQL = "select * from " UpdateTableName " where fSystemID= " SystemID

DB.Update(StrSQL, SetField)

End Sub

@#填充网络数据

Public Overloads Sub FillGrid(ByVal GridName As DataGrid)

GridName.DataSource = UpdateDataTable

End Sub

@#把数据网格的当前行数据定写入到输入控件中

Public Sub DataGridToText(ByVal frm As Form)

Dim RowIndex, i As Int16

Dim value

Dim obj As Control

Dim DataGrid As New DataGrid()

If FieldCount = 0 Then Exit Sub

For Each obj In frm.Controls

If obj.GetType.Name = "DataGrid" Then

DataGrid = obj

Exit For

End If

Next

RowIndex = DataGrid.CurrentRowIndex

For i = 1 To FieldCount - 1

value = DataGrid.Item(RowIndex, i)

If IsDBNull(value) = True Then

value = ""

End If

For Each obj In frm.Controls @#

If obj.TabIndex = i Then

obj.Text = value

Exit For

End If

Next

Next

End Sub

VB.net listview 如何插入一行

也不是很熟悉,将就用吧。

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

With ListView1

.Columns.Add("姓名")

.Columns.Add("年龄")

.Columns.Add("姓别")

End With

End Sub

Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Static Index As Integer

Index += 1

If ListView1.SelectedIndices.Count  0 Then '如果有选中则插入

Dim lItem As System.Windows.Forms.ListViewItem = ListView1.Items.Insert(ListView1.SelectedIndices.Item(0) + 1, "李丫"  Index)

lItem.SubItems.AddRange(Split("24,女", ","))

Else '否则添加

Dim lItem As System.Windows.Forms.ListViewItem = ListView1.Items.Add("李丫"  Index)

lItem.SubItems.AddRange(Split("24,女", ","))

End If

End Sub

vb.net Datagridview添加行

vb.net Datagridview添加行,需要四个按钮,一个datagridview控件。代码如下:

Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

'添加行

Me.DataGridView1.Rows.Add()

End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

'添加列

Me.DataGridView1.Columns.Add("1", "on")

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

'删除行

Me.DataGridView1.Rows.RemoveAt(0)

End Sub

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click

'删除列

Me.DataGridView1.Columns.RemoveAt(0)

End Sub

End Class


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