vb.net警告对话框 vb警告提示框
vb.net做音频播放器，如何消除对话框
有点复杂，如果是Excel，有Application.DisplayAlerts=False'这是Excel阻止警告
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我粗看了下MediaPlayer没有提供类似的接口，试着用消息捕获的方法看看
Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message) '消息捕获
If m.Msg = H999 Then '这里的值要你自己去测试出来（就是弹出对话框时的值)
SendKeys.Send("{ENTER}") '发送回车键
End If
MyBase.WndProc(m)
End Sub
vb系统中警告窗体是如何实现的？
Private Sub Command1_Click()
MsgBox "黄色感叹号 确定", vbExclamation, "系统提示"
End Sub
Private Sub Command2_Click()
MsgBox "绿色问号 确定！", vbQuestion, "系统提示"
End Sub
Private Sub Command3_Click()
MsgBox "绿色 i 确定", vbInformation, "系统提示"
End Sub
Private Sub Command4_Click()
MsgBox "终止 重试 忽略", vbAbortRetryIgnore, "系统提示"
End Sub
Private Sub Command5_Click()
MsgBox "是 否 取消", vbYesNoCancel, "系统提示"
End Sub
Private Sub Command6_Click()
MsgBox "确定", vbOKOnly, "系统提示"
End Sub
Private Sub Command7_Click()
MsgBox "大把 × 确定", vbCritical, "系统提示"
End Sub
Private Sub Command8_Click()
MsgBox "确定 取消", vbOKCancel, "系统提示"
End Sub
Private Sub Command9_Click()
MsgBox "确定 帮助", vbMsgBoxHelpButton, "系统提示"
End Sub
Private Sub Command10_Click()
MsgBox "重试 取消", vbRetryCancel, "系统提示"
End Sub
Private Sub Command11_Click()
MsgBox "是 否", vbYesNo, "系统提示"
End Sub
VB.NET中出现如图所示的警告如何更正，帮忙解决下 谢谢
Private Function getAccessConnection() As OleDbConnection
'整体思路应该是：连接数据库－运用适配器运行查询词句-将查询结果填充到数据集－以数据集为数据源，在DataGrid中显示。
Dim dbConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;
Data Source=|DataDirectory|\Resources\mag.mdb;Persist Security Info=true"
'连接字符串，Provider,连接引擎，可以死记，OLEDB就用这处，Data Source,设置数据库的位置。
Dim dbConnection As OleDbConnection = New OleDbConnection(dbConnectionString)
Try
dbConnection.Open()
Catch Ex As Exception
’MsgBox(Err.Description)
End Try
Return dbConnection
End Function
private Sub fillDataGridView()
Dim sqlStr As String = "select * from Table"
Dim DataAdapter As New OleDbDataAdapter
Dim dataSet As New DataSet
Dim DataGridView As New DataGridView
Dim dbConnection As OleDbConnection = getAccessConnection()
If dbConnection.State.ToString = "Closed" Then
MsgBox(Chr(13) " access 数据库连接失败 " Chr(13), , "警告")
Exit Sub
End If
DataAdapter.SelectCommand = New OleDbCommand(sqlStr,dbConnection)
'用数据适配器进行查询
Try
DataAdapter.Fill(dataSet,"Table") '将查询结果填充到数据集Dataset,有点像VB中的记录集recordset
DataGridView.DataSource = dataSet.Tables("Table").DefaultView '将数据集的内容在表格中显示出来
Catch Ex As Exception
MsgBox(Err.Description)
Finally
dataSet.Dispose
DataAdapter.Dispose
dbConnection.Close
dbConnection.Dispose
End Try
End Sub
vb.net中textbox 只输入字母,如果输入其他则弹出提示框
Private Sub TextBox1_KeyPress1(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
If e.KeyChar = "A" And e.KeyChar = "Z" Or e.KeyChar = "a" And e.KeyChar = "z" Then
e.Handled = False
Else
MessageBox.Show ("只能输入字母！")
e.Handled = True
Exit Sub
End If
End Sub
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