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