13518219792
Dim sl As New ArrayList
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sl.Add("单个字符串")
Dim sa As String() = {"a", "b", "c"}
sl.AddRange(sa) '添加字符数组
Dim objs As Object() = sl.ToArray '将数据转换为数组
注意，ArrayList不是类型安全的集合方式，如果你的集合只要存储字符串的话，建议用List(Of String)来进行操作。
在VB6以及VB.Net可以用 "" 输入空字符串。例如
Dim s As String
s = ""
在VB.Net中还可以用String.Empty输入空字符串。例如
Dim s As String
s = String.Empty
Public Sub AutoComplete(ByVal cmb As ComboBox, ByVal e As System.Windows.Forms.KeyPressEventArgs)
If cmb.DataSource Is Nothing Then
Return
End If
If e.KeyChar = Microsoft.VisualBasic.ChrW(Keys.Enter) Then
Return
End If
Dim strFindStr As String = ""
If e.KeyChar = Microsoft.VisualBasic.ChrW(Keys.Back) Then
If (cmb.SelectionStart = cmb.Text.Length) Then
If cmb.Text.Length 0 Then
strFindStr = cmb.Text.Substring(0, cmb.Text.Length - 1)
End If
Else
If cmb.SelectionStart 0 Then
strFindStr = cmb.Text.Substring(0, cmb.SelectionStart - 1)
End If
End If
e.Handled = False
Else
If (cmb.SelectionLength = 0) Then
strFindStr = cmb.Text + e.KeyChar
Else
If (cmb.SelectionStart = cmb.Text.Length) Then
strFindStr = e.KeyChar
Else
If cmb.SelectionStart 0 Then
strFindStr = cmb.Text.Substring(0, cmb.SelectionStart - 1) + e.KeyChar
Else
strFindStr = e.KeyChar
End If
End If
End If
End If
Dim intIdx As Integer = -1
Dim dv As DataView
If TypeOf (cmb.DataSource) Is DataTable Then
dv = CType(cmb.DataSource, DataTable).DefaultView
If strFindStr "" Then
dv.RowFilter = cmb.DisplayMember " Like '%" strFindStr "%'"
Else
dv.RowFilter = ""
End If
cmb.DataSource = dv
cmb.SelectedIndex = -1
cmb.Text = strFindStr
Else
dv = CType(cmb.DataSource, DataView)
If strFindStr "" Then
dv.RowFilter = cmb.DisplayMember " Like '%" strFindStr "%'"
Else
dv.RowFilter = ""
End If
cmb.DataSource = dv
cmb.SelectedIndex = -1
cmb.Text = strFindStr
End If
cmb.SelectionStart = strFindStr.Length
e.Handled = True
End Sub
Private Sub comboBox1_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles comboBox1.KeyPress
AutoComplete(sender, e)
End Sub
有甚多办法，我说个最简单的
dim xstr as string = "abcde"
Xstr = "(" xstr ")"
vb中可以使用+连接字符串，
也可以使用连接字符串，
建议使用连接字符串，以区别数学运算符+。
If "3333aa".EndsWith("aa") Then MessageBox.Show("以aa结尾")
or :
dim str as string = "3333aa"
if str.EndsWith("aa") Then MessageBox.Show("以aa结尾")
