WebBrowser control auto refresh

问题

I want to make a program in Visual Studio 2008 in Visual Basic. It involves a web browser and I want to make it auto refresh and allow people to choose the time period in which they want to auto refresh. It won't take user input but I have checkboxes that are preset. I think this may be possible using a timer and the WebBrowser1.Refresh() method. If I am mistaken, please correct me and tell me how to do this.

回答1:

From what I gather, it seems that you are trying to create a WinForms application in VB.NET. To accomplish your goal, you can:

Create a NumericUpDown or Textbox control to allow users to select a refresh time period (you can decide whether you want this to be in seconds, minutes, or something else).
Create a Timer object, and using the TextChanged event of the textbox or the ValueChanged event of the NumericUpDown control, set the entered value equal to the interval of the Timer.
Create buttons that call the Timer's start and stop function, to allow the user to start and stop auto-refreshing.
Subscribe to the Timer's Tick event and call the WebBrowser's Refresh method when the event is raised/fired.

Here's some sample code.

Public Class Form1
    Private Sub numInterval_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles numInterval.ValueChanged
        Timer1.Interval = numInterval.Value
    End Sub

    Private Sub btnStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnStart.Click
        Timer1.Start()

    End Sub

    Private Sub btnStop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnStop.Click
        Timer1.Stop()
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        WebBrowser1.Refresh(WebBrowserRefreshOption.Completely)
    End Sub
End Class

As you can see, I have added event handlers to Timer1.Tick and numInterval.ValueChanged.

回答2:

I would make a setting in "Properties > Settings" Tab for the interval you want to set for this I am going to name it unlimitRefresh and make sure it is a string and set the scope to user. After that I would make the interval options a DropDown button with every interval you want set and then I would make a two timers and for the first one I would set the interval to 1 and have it find out what the settings tab says. Then for the code for that I would type:

Timer2.Interval = My.Settings.unlimitRefresh

And then for timer one set that to whatever you want it on. Then for the code I would type:

WebBrowser1.Refresh()

After you are done just go to your dropdown button and double click each button for code and after that you type in:

My.Settings.unlimitRefresh = TYPE-THE-INTERVAL-HERE

Example:

My.Settings.unlimitRefresh = 100

After that it should work fine.

Also, I do realize this post is really old but just in case somebody does view it.

来源：https://stackoverflow.com/questions/1535617/webbrowser-control-auto-refresh

标签

.net

vb.net

winforms

webbrowser-control

refresh