VB.NET 如何繪制數(shù)學(xué)代數(shù)式（公式、方程、函數(shù)解析式等）？

絕對(duì)值是“|”，可以直接顯示，同理對(duì)數(shù)可用log(x)代替，根號(hào)和其他不支持顯示。

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如果要顯示數(shù)學(xué)式子，只能畫吧。

計(jì)算時(shí)可用“^”求冪或求根，“/”表示除法和分?jǐn)?shù)線，還有math類。

求大神指點(diǎn)vB.net 調(diào)用dm 的FindStr 時(shí) intX 和intY 要怎么定義呀?

首先vb.net里大漠插件的findstr命令是不能用的，因?yàn)関b.net自身的問題。intx和inty值只會(huì)返回0,0. 我們要用findstrE這個(gè)命令 pos = findstr。。。。。。

然后用split function給出x和y值

VB.NET中能否做一個(gè)像QQ那樣的聊天框，可以輸入文字和圖片？

第一個(gè)問題 qq聊天室 必須能 用vb都可以做

第二個(gè)問題 vb.net插入數(shù)學(xué)公式 可以把這些公式封裝到一個(gè)類中，調(diào)用就是了

用vb.net操作access數(shù)據(jù)庫(kù)

mports System.Drawing

Imports System.ComponentModel

Imports System.Windows.Forms

Imports System.Data.OleDb

Imports System.Data

Public Class Form1

Inherits Form

Private components As System.ComponentModel.Container = Nothing

Private WithEvents lastrec As Button

Private WithEvents nextrec As Button

Private WithEvents previousrec As Button

Private WithEvents firstrec As Button

Private t_books As TextBox

Private t_nl As TextBox

Private t_xb As TextBox

Private t_xm As TextBox

Private t_id As TextBox

Private l_books As Label

Private l_nl As Label

Private l_xb As Label

Private l_xm As Label

Private l_id As Label

Private label1 As Label

Private myDataSet As DataSet

Private WithEvents button1 As Button

Private WithEvents button2 As Button

Private WithEvents button3 As Button

Private WithEvents button4 As Button

Private myBind As BindingManagerBase

Public Sub New ( )

MyBase.New ( )

GetConnected ( )

InitializeComponent ( )

End Sub

'清除在程序中使用過的資源

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

Public Sub GetConnected ( )

'創(chuàng)建一個(gè)數(shù)據(jù)連接

Dim strCon As String = " Provider = Microsoft.Jet.OLEDB.4.0 ;

Data Source = db.mdb "

Dim myConn As OleDbConnection = New OleDbConnection ( )

myConn.ConnectionString = strCon

Dim strCom As String = " SELECT * FROM person "

'創(chuàng)建一個(gè) DataSet

myDataSet = New DataSet ( )

myConn.Open ( )

'通過OleDbDataAdapter對(duì)象得到一個(gè)數(shù)據(jù)集

Dim myCommand As OleDbDataAdapter = New OleDbDataAdapter

( strCom , myConn )

'把Dataset綁定books數(shù)據(jù)表

myCommand.Fill ( myDataSet , "person" )

'關(guān)閉此數(shù)據(jù)連接

myConn.Close ( )

End Sub

'插入數(shù)據(jù)記錄操作代碼

Private Sub button2_Click (ByVal sender As Object , _

ByVal e As System.EventArgs) Handles button2.Click

'判斷所有字段是否添完，添完則執(zhí)行，反之彈出提示

If ( t_id.Text "" And t_xm.Text ""

And t_xb.Text "" And t_nl.Text ""

And t_books.Text "" ) Then

Dim myConn1 As String = " Provider = Microsoft.Jet.OLEDB.4.0 ;

Data Source = db.mdb"

Dim myConn As OleDbConnection = New OleDbConnection ( myConn1 )

myConn.Open ( )

Dim strInsert As String = " INSERT INTO person ( id , xm , xb , nl

, zip ) VALUES ( " _

t_id.Text + " , '" _

t_xm.Text + "' , '" _

t_xb.Text + "' , " _

t_nl.Text + " , " _

t_books.Text + ")"

Dim inst As OleDbCommand = New OleDbCommand ( strInsert , myConn )

inst.ExecuteNonQuery ( )

myConn.Close ( )

myDataSet.Tables ( "person" ).Rows ( myBind.Position ).BeginEdit ( )

myDataSet.Tables ( "person" ).Rows ( myBind.Position ).EndEdit ( )

myDataSet.Tables ( "person" ).AcceptChanges ( )

Else

MessageBox.Show ( "必須填滿所有字段值！" , "錯(cuò)誤！" )

End If

End Sub

求助一下vb.net調(diào)用大漠插件并且多線程

你這個(gè)是操作多個(gè)窗口還是操作單個(gè)窗口

單個(gè)窗口的話，沒必要?jiǎng)?chuàng)建多個(gè)對(duì)象，1個(gè)就夠了。

如果特殊情況下需要?jiǎng)?chuàng)建多個(gè)大漠插件的對(duì)象，承載對(duì)象的變量可設(shè)置成數(shù)組型，或者可更換成模塊去創(chuàng)建多個(gè)對(duì)象

我以前用過：如圖，這個(gè)模塊可以實(shí)現(xiàn)，需要的話精益論壇上有? 搜索下

代碼的寫法如下：

1、先創(chuàng)建個(gè)全局變量的對(duì)象數(shù)組

2、如下

VB.net當(dāng)中用數(shù)學(xué)函數(shù)math.sin出現(xiàn)的問題

-1.52341E-13

科學(xué)計(jì)數(shù)法，10的-13次方表示此數(shù)已經(jīng)接近于0了，應(yīng)該是single類型的精度導(dǎo)致的，你把精度設(shè)置適當(dāng)應(yīng)該就可以了。