關(guān)于VB.NET進(jìn)度條的實(shí)例

這是我自己寫(xiě)的一個(gè)進(jìn)度條控件，如圖：

目前成都創(chuàng)新互聯(lián)已為上1000+的企業(yè)提供了網(wǎng)站建設(shè)、域名、雅安服務(wù)器托管、網(wǎng)站托管、企業(yè)網(wǎng)站設(shè)計(jì)、衡水網(wǎng)站維護(hù)等服務(wù)，公司將堅(jiān)持客戶導(dǎo)向、應(yīng)用為本的策略，正道將秉承"和諧、參與、激情"的文化，與客戶和合作伙伴齊心協(xié)力一起成長(zhǎng)，共同發(fā)展。

邊框粗細(xì)和邊框顏色以及進(jìn)度條顏色都可以調(diào)。

進(jìn)度條大小你可以自己拉伸。

同時(shí)，進(jìn)度條還提供了豐富的動(dòng)畫(huà)效果（如邊框閃爍效果【可關(guān)閉】，進(jìn)度條滑動(dòng)效果等。）

將邊框粗細(xì)調(diào)為0即可實(shí)現(xiàn)無(wú)邊框（同時(shí)邊框閃爍效果（見(jiàn)“Flash”屬性）也將關(guān)閉?。?/p>

進(jìn)度值（見(jiàn)“ProgressValue”屬性）類型為Single（單精度浮點(diǎn)數(shù)）

將我提供的DLL文件拖到工具箱即可安裝

只能用于Windows窗體應(yīng)用程序！

目標(biāo)平臺(tái)：.Net Framework 3.5

屬性說(shuō)明：

1.BorderColor 用于調(diào)整邊框顏色

2.BorderWidth 用于調(diào)整邊框粗細(xì)

3.Flash 用于開(kāi)啟、關(guān)閉邊框閃爍效果

4.ProgressValue 用于設(shè)置、查看進(jìn)度值

5.ForeColor 用于設(shè)置進(jìn)度條顏色

6.BackColor 用于設(shè)置控件背景色

附件如果丟失，請(qǐng)私信。

vb.net變量創(chuàng)建實(shí)例

dim str as string = "hjl"

dim hjl as new textbox

hjl.text = str

真不太懂你的意思,

求一個(gè)VB.net 增刪改查實(shí)例 ，哪位大神有空幫我寫(xiě)一下或者有現(xiàn)成的給我一個(gè)，，我比較菜又比較急，在線等

Imports System.Data.OleDb

'Imports System.Data.OracleClient

Imports System.Data.SqlClient

'鏈接Oracle

'cn = New SqlConnection(""Data Source=TNS名稱;Persist Security Info=True;User ID=用戶名;Password=密碼;" ")

'Imports System.Data.OracleClient

'Dim oOracleConn As OracleConnection = New OracleConnection()

'oOracleConn.ConnectionString = ""Data Source=MyOracleDB; User Id=username; Password=passwd; Integrated Security=no; "

'oOracleConn.Open()

'鏈接SQL Server

'cn = New SqlConnection("Data Source=.;Initial Catalog=Sales;Integrated Security=False;User ID=sa;Password=;")

'鏈接Access

'cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" db_path ";Persist Security Info=False")

Public Class Fun_DataBase

Dim cn As OleDbConnection

Dim cm As OleDbCommand

Dim da As OleDbDataAdapter

Dim ds As DataSet

Dim db_path As String = "D:\Documents\Visual Studio 2013\Projects\VBnet1\VBnet1\Resources\Database1.mdb"

Function Fun_sql1(Str_sql As String, V_調(diào)用來(lái)源 As String) '按指定sql，反饋1個(gè)查詢值

Try

'Dim cn As New OleDbConnection("Data Source=.;Initial Catalog=Sales;Integrated Security=False;User ID=sa;Password=123456;")

'鏈接Access

cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" db_path ";Persist Security Info=False")

cn.Open() 'sql語(yǔ)句執(zhí)行前，必須打開(kāi)連接

cm = New OleDbCommand(Str_sql, cn)

cm.ExecuteNonQuery()

Dim strValue As String = cm.ExecuteScalar.ToString

'MessageBox.Show(strValue)

Fun_sql1 = strValue

cn.Close()

Fun_sql1 = True

Catch ex As Exception

MessageBox.Show(V_調(diào)用來(lái)源 ":執(zhí)行sql語(yǔ)句失??！" Str_sql)

Fun_sql1 = False

End Try

End Function

Function Fun_sqln(Str_sql As String, V_調(diào)用來(lái)源 As String) '按指定sql，反饋1行n列查詢值

Try

'鏈接Access

cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" db_path ";Persist Security Info=False")

cn.Open() 'sql語(yǔ)句執(zhí)行前，必須打開(kāi)連接

Dim cmd As New OleDbCommand("select * from grade", cn)

'Dim dr As SqlDataReader

Dim dr As OleDbDataReader

dr = cmd.ExecuteReader()

Dim strDisplay As String = ""

While dr.Read()

Fun_sqln = dr(0).ToString "|"

End While

cn.Close()

Fun_sqln = True

Catch ex As Exception

MessageBox.Show(V_調(diào)用來(lái)源 ":執(zhí)行sql語(yǔ)句失?。? Str_sql)

Fun_sqln = False

End Try

'Dim s = Split(F.Fun_sqln("ef"), "|")

'Dim i As Integer

'i = UBound(s)

'For i = 0 To UBound(s)

' MessageBox.Show(s(i))

'Next

End Function

Public Function Fun_sql_exec(Str_sql As String, V_調(diào)用來(lái)源 As String) '執(zhí)行指定sql，反饋T|F

Try

'鏈接Access

cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" db_path ";Persist Security Info=False")

cn.Open() 'sql語(yǔ)句執(zhí)行前，必須打開(kāi)連接

cm = New OleDbCommand(Str_sql, cn)

cm.ExecuteNonQuery()

cn.Close()

Fun_sql_exec = True

Catch ex As Exception

MessageBox.Show(V_調(diào)用來(lái)源 ":執(zhí)行sql語(yǔ)句失??！" Str_sql)

Fun_sql_exec = False

End Try

End Function

VB.net實(shí)例

1 生成txt文件。

DimSaveFileDialog1AsNewSaveFileDialog()?'創(chuàng)建一個(gè)保存對(duì)話框

SaveFileDialog1.Filter?="txt?files?(*.txt)|*.txt"?'設(shè)置擴(kuò)展名

IfSaveFileDialog1.ShowDialog()?=?System.Windows.Forms.DialogResult.OKThen?'如果確定保存

My.Computer.FileSystem.WriteAllText(SaveFileDialog1.Filename,?Textbox1.Text,False)?'保存文本,False表示不追加文本，直接覆蓋其內(nèi)容

EndIf

原文鏈接：

求vb.net句柄實(shí)例，實(shí)現(xiàn)操作其他程序窗口。如我給的例子

Imports?System.Text

Imports?System.Runtime.InteropServices

Public?Class?Form1

'?相關(guān)API函數(shù)聲明,注釋掉的這里沒(méi)用到，但是也比較常用吧，這些函數(shù)的功能都能搜到。

Private?Declare?Function?FindWindow?Lib?"user32"?Alias?"FindWindowA"?(ByVal?lpClassName?As?String,?ByVal?lpWindowName?As?String)?As?IntPtr

Private?Declare?Function?FindWindowEx?Lib?"user32"?Alias?"FindWindowExA"?(ByVal?hWnd1?As?IntPtr,?ByVal?hWnd2?As?IntPtr,?ByVal?lpsz1?As?String,?ByVal?lpsz2?As?String)?As?IntPtr

Private?Delegate?Function?EnumChildProc(ByVal?hWnd?As?IntPtr,?ByVal?lParam?As?Integer)?As?Boolean

Private?Declare?Function?EnumChildWindows?Lib?"user32.dll"?(ByVal?hWndParent?As?IntPtr,?ByVal?lpEnumFunc?As?EnumChildProc,?ByVal?lParam?As?Integer)?As?Boolean

Private?Declare?Auto?Function?SendMessage?Lib?"User32.dll"?(ByVal?hWnd?As?IntPtr,?ByVal?Msg?As?Integer,?ByVal?wParam?As?Integer,?ByVal?lParam?As?String)?As?Integer

'Private?Declare?Function?CheckDlgButton?Lib?"user32"?Alias?"CheckDLGButtonA"?(ByVal?hDlg?As?IntPtr,?ByVal?nIDButton?As?IntPtr,?ByVal?wCheck?As?Integer)?As?Integer

Private?Declare?Function?GetClassName?Lib?"user32"?Alias?"GetClassNameA"?(ByVal?hWnd?As?IntPtr,?ByVal?lpClassName?As?StringBuilder,?ByVal?nMaxCount?As?Integer)?As?Integer

'Private?Declare?Function?GetWindowThreadProcessId?Lib?"user32"?Alias?"GetWindowThreadProcessId"?(ByVal?hwnd?As?IntPtr,?ByVal?lpdwProcessId?As?Long)?As?Integer

Private?Declare?Auto?Function?GetWindowTextLength?Lib?"user32"?Alias?"GetWindowTextLength"?(ByVal?hwnd?As?IntPtr)?As?Integer

Private?Declare?Function?GetWindowText?Lib?"user32"?Alias?"GetWindowTextA"?(ByVal?hwnd?As?IntPtr,?ByVal?lpString?As?StringBuilder,?ByVal?cch?As?Integer)?As?Integer

'?相關(guān)消息定義，也有沒(méi)用到的

Const?WM_SETTEXT?=?HC

Const?WM_GETTEXT?=?HD

'Const?WM_SETFOCUS?=?H7

'Const?WM_KILLFOCUS?=?H8

'Const?WM_CLOSE?=?H10

'Const?WM_SYSCOMMAND?=?H112

'Const?SC_CLOSE?=?HF060

'Const?SC_MINIMIZE?=?HF020

Const?BM_GETCHECK?=?HF0

Const?BM_SETCHECK?=?HF1

Const?BM_GETSTATE?=?HF2

Const?BM_SETSTATE?=?HF3

Const?BM_SETSTYLE?=?HF4

Const?BM_CLICK?=?HF5

'Const?BM_GETIMAGE?=?HF6

'Const?BM_SETIMAGE?=?HF7

Const?BST_UNCHECKED?=?O0

Const?BST_CHECKED?=?O1

Const?BST_INDETERMINATE?=?O2

'?儲(chǔ)存窗口句柄

Dim?WindowHandle?As?IntPtr

'?儲(chǔ)存兩個(gè)（或者多個(gè)）編輯框句柄

Dim?EditHandle?As?New?List(Of?IntPtr)

Dim?EditWindowsText?As?List(Of?String)

'?儲(chǔ)存復(fù)選框句柄

Dim?CheckHandle?As?IntPtr?=?0

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

Button1_Click(sender,?e)

End?Sub

'?EnumChildWindows?回調(diào)函數(shù)，該函數(shù)名作為API函數(shù)EnumChildWindows?的一個(gè)參數(shù)

'?該函數(shù)實(shí)現(xiàn)了枚舉各個(gè)子窗口，找出編輯框?qū)傩缘墓δ?/p>

Public?Function?EnumChildProcC(ByVal?hwnd?As?IntPtr,?ByVal?lParam?As?Integer)?As?Boolean

Dim?dwWindowClass?As?StringBuilder?=?New?StringBuilder(100)

'?獲得某一個(gè)句柄的類名

GetClassName(hwnd,?dwWindowClass,?100)

If?dwWindowClass.ToString.Contains("EDIT")?Or?dwWindowClass.ToString.Contains("Edit")?Then?????'?類名包含EDIT的為編輯框

EditHandle.Add(hwnd)????????????????????????'?存儲(chǔ)該句柄

End?If

'?返回?True?一直枚舉完

Return?True

End?Function

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

WindowHandle?=?FindWindow(vbNullString,?"登陸")

If?WindowHandle.ToInt32?=?0?Then

MsgBox("未捕獲到窗口"?+?"登陸")

Return

End?If

'?枚舉所有主窗口的子窗口（控件），枚舉時(shí)自動(dòng)調(diào)用回調(diào)函數(shù)，完成編輯框句柄的獲取

EnumChildWindows(WindowHandle,?AddressOf?EnumChildProcC,?0)

'?尋找復(fù)選框

CheckHandle?=?FindWindowEx(WindowHandle,?IntPtr.Zero,?vbNullString,?"記住密碼")

Dim?str?As?New?StringBuilder

Dim?j?As?Integer?=?0

'?對(duì)編輯框文本賦值

For?j?=?0?To?EditHandle.Count?-?1

SendMessage(EditHandle(j),?WM_SETTEXT,?0,?"Text")

'GetWindowText(EditHandle(j),?str,?20)

'EditWindowsText.Add(Str.ToString)

'Str.Clear()

Next

If?EditHandle.Count?=?0?Then

MsgBox("未找到輸入框！")

End?If????????

If?CheckHandle.ToInt32??0?Then

'CheckDlgButton(WindowHandle,?id,?1)

'?對(duì)復(fù)選框進(jìn)行鼠標(biāo)單擊操作

SendMessage(CheckHandle,?BM_CLICK,?0,?0)

'SendMessage(CheckHandle,?BM_SETCHECK,?True,?0)

End?If

End?Sub

End?Class

VB.net中類的實(shí)例化

1.不正確

Dim abc As myClass，定義一個(gè)可以引用myClass類型對(duì)象的變量abc。這個(gè)abc變量存在于棧上。

abc=New myClass。New myClass創(chuàng)建myClass實(shí)例對(duì)象，這個(gè)對(duì)象存在于托管堆上。然后（同時(shí)）讓abc引用（指向）這個(gè)對(duì)象。

abc變量在棧上，而對(duì)象在托管堆上。

abc儲(chǔ)存的是對(duì)象的地址，而不是對(duì)象本身。

看下面的代碼

Dim a As myClass,b As myClass,c As myClass

a=New myClass

b=a

c=a

整個(gè)過(guò)程中只創(chuàng)建了一個(gè)myClass對(duì)象，位于托管堆上。

三個(gè)myClass類型的變量a、b、c位于棧上，都指向了這一個(gè)myClass對(duì)象

2.類的成員分 實(shí)例成員 和 靜態(tài)成員

實(shí)例成員 必須在實(shí)例對(duì)象上調(diào)用

靜態(tài)成員 可以直接調(diào)用，不需要實(shí)例對(duì)象。

當(dāng)前名稱：關(guān)于vb.net實(shí)例大全的信息
轉(zhuǎn)載來(lái)源：http://jinyejixie.com/article46/dochchg.html

成都網(wǎng)站建設(shè)公司_創(chuàng)新互聯(lián)，為您提供軟件開(kāi)發(fā)、域名注冊(cè)、建站公司、標(biāo)簽優(yōu)化、用戶體驗(yàn)、微信公眾號(hào)

廣告

聲明：本網(wǎng)站發(fā)布的內(nèi)容（圖片、視頻和文字）以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主，如果涉及侵權(quán)請(qǐng)盡快告知，我們將會(huì)在第一時(shí)間刪除。文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng)，如需處理請(qǐng)聯(lián)系客服。電話：028-86922220；郵箱：631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載，或轉(zhuǎn)載時(shí)需注明來(lái)源： 創(chuàng)新互聯(lián)