我在javascript函数中使用navigator.connection获取值时遇到问题。我有两个函数正在尝试返回数据,并且都抛出错误说System.SystemException。
//Connection Type
function getConnectionType() {
//var connectionType = navigator.connection;
var connection = navigator.connection || navigator.mozConnection || navigator.webkitConnection;
var connectionType = connection.type
window.external.notify("COT" + connectionType.toString());
}
//Bandwidth
function getBandwidth() {
//var online = navigator.onLine;
var connection = navigator.connection || navigator.mozConnection || navigator.webkitConnection;
var bandwidth = connection.bandwidth
//window.external.notify("BAN" + bandwidth.toString() + " Mbps");
window.external.notify("BAN" + bandwidth.toFixed(2) + " Mbps");
}
我在 C# 中使用 InvokeScript 调用此函数
private void RunPerformanceTestButton_Click(object sender, RoutedEventArgs e)
{
//Bandwidth
object bandwidth = Browser.InvokeScript("getBandwidth"); //Error
//Connection Type
object connectionType = Browser.InvokeScript("getConnectionType"); //Error
}
private void Browser_ScriptNotify(object sender, NotifyEventArgs e)
{
string value = null;
string statistic = null;
statistic = e.Value.Substring(0, 3);
value = e.Value.Substring(3);
switch (statistic)
{
//Bandwidth
case "BAN":
BANResultTextBlock.Text = value;
break;
//Connection type
case "COT":
COTResultTextBlock.Text = value;
break;
default:
return;
}
}
错误
System.SystemException 未由用户代码
处理 HResult=-2146233087 消息=发生未知错误。错误: 80020101. Source=Microsoft.Phone.Interop StackTrace: at Microsoft.Phone.Controls.NativeMethods.ValidateHResult(Int32 hr) at Microsoft.Phone.Controls.WebBrowserInterop.InvokeScript(String 脚本名称,字符串[] 参数) at Microsoft.Phone.Controls.WebBrowser.InvokeScript(String scriptName) at Network_Performance_Test.MainPage.RunPerformanceTestButton_Click(Object sender, RoutedEventArgs e) at System.Windows.Controls.Primitives.ButtonBase.OnClick() at System.Windows.Controls.Button.OnClick() at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e) at System.Windows.Controls.Control.OnMouseLeftButtonUp(Control ctrl, EventArgs e) 在MS。Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, 字符串事件名称) 内部异常:
我相信问题出在navigation.connection
.我使用相同的实现来返回window.performance.timing
数据,并且效果很好。有什么想法吗?我真的需要这些数据来用于性能和增强目的。请注意,这一切都是在 Windows Phone 8 中的 WebBrowser 控件中完成的。
http://www.sitepoint.com/use-network-information-api-improve-responsive-websites/声明At the time of writing, the Network Information API has little browser support and could change.