包含vb.netjoin的词条

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VB如何获取textbox指定的字符串，如果有规律的字符如何抓取

Function InStr([Start], [String1], [String2], [Compare As VbCompareMethod = vbBinaryCompare])

返回在另一字符串中第一次出现某一字符串的位置

eg: msgbox instr("a:"":我""",":") 结果为 2

Function InStrRev(StringCheck As String, StringMatch As String, [Start As Long = -1], [Compare As VbCompareMethod = vbBinaryCompare]) As Long

返回在另一字符串中第一次出现某一字符串的位置从后面查找

MsgBox InStrRev("a:"":我""", ":") 结果为 4

Function Join(SourceArray, [Delimiter]) As String

把数组转换成字符串可查下

eg: 有数组 a()={"123","234","345"}'这里的语法在vb中不能用 vb.net 可以

join(a,"b") 结果为 123b234b345

Function Split(Expression As String, [Delimiter], [Limit As Long = -1], [Compare As VbCompareMethod = vbBinaryCompare])

把字符串分成数组与Join 相反

eg:有字符串 “123b234b345”

dim a()

a=Split("123b234b345","b")

结果为： a()={"123","234","345"}

然后就是你用过的 mid left right replace 等等其实上面的几个查找函数基本就能解决你的问题了

相关问答

Q1: 在VB.NET中怎么样判断一个数组是不是为空

一vb.netjoin：利用错误捕获功能判断

Dim ArrayS() As String

Private Sub Command1_Click()

On Error GoTo z

ReDim ArrayS(10)

If UBound(ArrayS) -1 Then

MsgBox "数组不为空"

End If

Exit Sub

MsgBox "数组空"

End Sub

二、 Join方法vb.netjoin：

Dim ArrayS() As String

Private Sub Command1_Click()

If (CStr(Join(ArrayS, ""))) = "" Then

MsgBox "为空"

Else

MsgBox "不为空"

End If

End Sub

Q2: vb.net中如何结束一个线程

vb.net中如何结束一个线程

一般而言,如果您想终止一个线程,您可以使用System.Threading.Thread类的Abort方法. 例如:

Dim worker As ThreadStart = New ThreadStart(AddressOf workerthreadmethod)

Dim t As Thread = New Thread(worker)

t.Start()

MessageBox.Show("Wait for a while for the thread to start.")

MessageBox.Show(t.ThreadState.ToString())

t.Abort()

MessageBox.Show(t.ThreadState.ToString())

t.Join()

MessageBox.Show(t.ThreadState.ToString())

当然,在调用Abort方法后,线程并不是立刻终止,要等线程的所有finally快中的代码完成后才会完全终止. 所以在主线程中可以用Join方法来同步,当线程还未完全终止时,t.Join()将处于等待,直到t线程完全结束后再继续执行后面的语句。

Abort方法是会导致线程跳出一个异常错误的，你需要在代码中捕获该异常。下面是一个比较完整的VB.NET线程例子：

Imports System

Imports System.Threading

Public Class MyTestApp

Public Shared Sub Main()

Dim t As New Thread(New ThreadStart(AddressOf MyThreadMethod))

'Start the thread

t.Start()

MsgBox("Are you ready to kill the thread?")

'Kill the child thread and this will cause the thread raise an exception

t.Abort()

' Wait for the thread to exit

t.Join()

MsgBox("The secondary thread has terminated.")

End Sub

Shared Sub MyThreadMethod()

Dim i As Integer

Try

Do While True

Thread.CurrentThread.Sleep(1000)

Console.WriteLine("This is the secondary thread running.")

Loop

Catch e As ThreadAbortException

MsgBox("This thread is going to be terminated by the Abort method in the Main function")

End Try

End Sub

End Class

Thread.Abort()方法用来永久销毁一个线程，而且将抛出ThreadAbortException异常。使终结的线程可以捕获到异常但是很难控制恢复，仅有的办法是调用Thread.ResetAbort()来取消刚才的调用，而且只有当这个异常是由于被调用线程引起的异常。因此，A线程可以正确的使用Thread.Abort()方法作用于B线程，但是B线程却不能调用Thread.ResetAbort()来取消Thread.Abort()操作。

Q3: VB.net 如果读取txt数据(或十进制dat数据)

vb.net虽也有input语句vb.netjoin，但一次只能读取到一个变量中vb.netjoin，可以用TextFieldParser类代替，但似乎没以前的方便。不过比以前的更灵活。写入文件Write还是可以用，在Microsoft.VisualBasic.FileIO中。

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

Dim fileName As String = "E:\User Documents\Master\My Documents\电子阅读\股票\table2.csv"

Using Recrods As New Microsoft.VisualBasic.FileIO.TextFieldParser(fileName) '建立TextFieldParser对象

'MyReader.TextFieldType = FieldType.Delimited

Recrods.SetDelimiters(",") '把字段分隔符设置为","

Dim curRow() As String

Do Until Recrods.EndOfData

curRow = Recrods.ReadFields() '读取记录行，返回字符串数组，所以不同字段类型需要自己转换。

Debug.Print(Join(curRow, vbTab))

Loop