vb.net只能输数字 vb文本框只能输入数字

vb.net 让相应的textbox中只能输入“中文字符、英文、数字”

每个textbox都有KeyPress事件(event),每次用户输入一个字符时检测,如不满足则清空

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我现在不在vs下,你可以找到这个面板,绑定相应的函数

比如只能显示数字

Private Sub NumBox_KeyPress(KeyAscii As Integer)

If Not IsNumeric(NumBox.Text) Then

NumBox.Text = ""

End If

End Sub

只能显示英语(a-z 97-122; A-Z 65-90; 8(退格)和13(换行))

Private Sub EngBox_KeyPress(KeyAscii As Integer)

If Not (KeyAscii = 97 And KeyAscii=122) Or (KeyAscii = 90 And KeyAscii=65) Or = 8 Then

EngBox.Text = ""

End If

End Sub

只能显示汉字(汉字的ASCII值要么小于0,要么是8(退格)和13(换行))

Private Sub ChineseBox_KeyPress(KeyAscii As Integer)

If Not KeyAscii  0 Or KeyAscii = 8 Or KeyAscii = 13 Then

ChineseBox.Text=""

End If

End Sub

做了一些小修改,不明白请及时追问,满意敬请采纳,O(∩_∩)O谢谢

如何在VB.NET 中限制文本框中只能输入数字

以下是只能输入数字和小数点,并且小数点只能输入一次

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Textbox1.KeyPress

If Char.IsDigit(e.KeyChar) or e.KeyChar = Chr(8) or e.KeyChar = "." Then

If e.KeyChar = "." And InStr(TextBox1.Text, ".") 0 Then

e.Handled = True

Else

e.Handled = False

End If

Else

e.Handled = True

End If

End Sub

VB.NET中让Textbox只能输入数字

Public Class Form     Inherits System Windows Forms Form

#Region Windows 窗体设计器生成的代码

Public Sub New()        MyBase New()

该调用是 Windows 窗体设计器所必需的         InitializeComponent()

在 InitializeComponent() 调用之后添加任何初始化

End Sub

窗体重写 dispose 以清理组件列表     Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)        If disposing Then            If Not (ponents Is Nothing) Then                ponents Dispose()            End If        End If        MyBase Dispose(disposing)    End Sub

Windows 窗体设计器所必需的    Private ponents As System ComponentModel IContainer

注意: 以下过程是 Windows 窗体设计器所必需的    可以使用 Windows 窗体设计器修改此过程     不要使用代码编辑器修改它     Friend WithEvents TextBox As System Windows Forms TextBox    Private Sub InitializeComponent()        Me TextBox = New System Windows Forms TextBox        Me SuspendLayout()                TextBox                 Me TextBox Location = New System Drawing Point( )        Me TextBox Name = TextBox         Me TextBox TabIndex =         Me TextBox Text =                 Form                 Me AutoScaleBaseSize = New System Drawing Size( )        Me ClientSize = New System Drawing Size( )        Me Controls Add(Me TextBox )        Me Name = Form         Me Text = Form         Me ResumeLayout(False)

End Sub

#End Region    Dim str As String =

lishixinzhi/Article/program/net/201311/13841

VB.NET下,让textbox只能输入数字,小数点,和负号,我的代码哪里有错?

private str as string 'str最好定义到外面

Private Sub TextBox1_KeyUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyUp

Dim d As Double

If Double.TryParse(TextBox1.Text, d) Or TextBox1.Text = "-" Or TextBox1.Text.Trim() = "" Then

str = TextBox1.Text

Else

TextBox1.Text = str

TextBox1.SelectionStart = TextBox1.Text.Length

TextBox1.Focus()

End If

End Sub

VB.NET中的DATAGRIDVIEW怎样只能在表格中输入数字呢

第一部、先定义一个单元格操作变量,如下

Dim cellEdit As DataGridViewTextBoxEditingControl = Nothing

第二部、然后在在控件的EditingControlShowing事件中添加入下代码,参考如下:

Private Sub DataGridView3_EditingControlShowing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles DataGridView3.EditingControlShowing

cellEdit = CType(e.Control, DataGridViewTextBoxEditingControl)

cellEdit.SelectAll()

AddHandler cellEdit.KeyPress, AddressOf dataGridView3_KeyPress

End Sub

第三部:在要控制的列加入控件键盘按钮的代码,如下面ROLL列是要控制的列

Private Sub dataGridView3_KeyPress(ByVal sender As Object, ByVal e As KeyPressEventArgs) Handles DataGridView3.KeyPress

Dim i As Integer = DataGridView3.CurrentCellAddress.X

Dim ColumnName As String = DataGridView3.Columns(i).Name

If (ColumnName = "rollno") Then

If Not Char.IsDigit(e.KeyChar) And e.KeyChar Chr(8) Then

e.Handled = True

End If

End If

End Sub


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