并非所有的代码路径都返回值 vb.net
我这个过程是这样,之后用一个按键下执行。
Function updateteacher() '将数据更新到数据库。
MyConnection.Open()
Try
MyCommand = New OleDbCommand("UPDATE teacher SET teachername ='" & Txtname1.Text & "',[password]='" & Txtpassword1.Text & "',coursesID='" & Txtcoursescode1.Text & "',grade='" & Combograde1.Text & "',class='" & Comboclass1.Text & "' WHERE teacherid = '" & txtuserid1.Text & "'", MyConnection)
MyCommand.ExecuteNonQuery()
Catch c As Exception
MsgBox(c.ToString)
End Try
MyConnection.Close()
MyCommand.Dispose()
End Function
我不明白这个是怎么回来,执行时提示:并非所有的代码路径都返回值 。