Xamarin.Forms参考冲突

Question

My problem in Xamarin.Forms

i tried to use the class Reachability.cs from Xamarin (Downloaded from official source) used the check a url or ip address is reachable.

When i try to build it shows me the following error message:

Reference to type 'IPAddress' claims it is defined in 'System', but it could not be found

I dont know how to solve it my usings are

using System;
using SystemConfiguration;
using CoreFoundation;

Kind Regards,

Stefan

Answer 1

IPAddress is part of System.Net add

using System.Net;

to your usings - it' not listet in your question

Check that the following assemblies are selected in your references (right click on references, edit references, all - I hope the names are correct as my xamarin studio is in german)

• System
• System.Core
• System.Xml
• System.iOS

Add the reachability.cs to your project

Add this lines to the c'tor or somewhere else in the class you want to use the reachability stuff

UpdateStatus (null, null);
Reachability.ReachabilityChanged += UpdateStatus;

Add an eventhandler

void UpdateStatus (object sender, EventArgs e)
    {
        Console.WriteLine(Reachability.RemoteHostStatus ().ToString());
        Console.WriteLine(Reachability.InternetConnectionStatus ().ToString());
        Console.WriteLine(Reachability.LocalWifiConnectionStatus ().ToString());

    }

Answer 2

Reachability.cs depends on System.Net classes which do not exist in PCL. To test Reachability in Forms, use the Connectivity plugin instead.