我正在使用' MENU FORM
Public Class frmMenu
Public Property FromForm As Form
Private Sub btnMdr2_Click(sender As Object, e As EventArgs) Handles _
btnMdr2.Click
FromForm = Me
Dim mdr2Form As New ParentForm
mdr2Form.Show()
End Sub
End Class
'PARENT FORM
Public Class ParentForm
Public Property FromForm As Form
Public Sub MachineDailyReportForm_Load(sender As Object, e As EventArgs)_
Handles MyBase.Load
FromForm = Me
'Show loading screen
Dim loadingForm As New LoadingForm(FromForm)
loadingForm.Show()
'Use For loop to delay the process(add data in list) and to see
'loading screen
For i As Long = 0 To 1000000000
If i = 1000000000 Then
Exit For
Else
Continue For
End If
Next
Dim list As New List(Of String)
machineList.Items.Add("Wheel")
machineList.Items.Add("Range")
machineList.Items.Add("Gear")
'Close loading screen
loadingForm.CloseLoadingDialog()
End Sub
End Class
'LOADING FORM
Public Class LoadingForm
Public Property FromForm As Form
Public Sub New(ByVal FromForm As Form)
InitializeComponent()
Me.FromForm = FromForm
End Sub
Public Sub SplashScreen_Load() Handles MyBase.Load
PictureBoxGif.Image = My.Resources.loading
Show()
Refresh()
End Sub
Public Sub CloseLoadingDialog()
Me.Close()
Me.Dispose()
End Sub
End Class
，SqlConnection和SqlCommand查询Microsoft SQL数据库，就像在https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/retrieving-data-using-a-datareader中所述
现在，SqlReader允许设置SqlCommand，我正在这样做（简化）：
CommandTimeout我的问题是，超时实际上适用于什么？是
using (SqlConnection connection = GetConnection()) {
connection.Open();
using (SqlCommand command = connection.CreateCommand()) {
command.CommandText = query; //My custom SQL query
command.CommandType = CommandType.Text;
//Set Timeout
command.CommandTimeout = timeout.Value; //My custom timeout
using (SqlDataReader reader = command.ExecuteReader()) {
while (reader.Read()) {
//Read row by row and do stuff
}
}
}
}
中花费的时间ExecuteReader()中花费的时间在MSDN和Web上似乎都没有专门的文档。
答案 0 :(得分：1)
它将适用于针对数据库command.ExecuteReader()执行命令的时间，该时间在您开始读取记录时已完成。您可以通过在while之后插入一个断点并坐在那里来进行测试，以确保不会超时。