android - Xamarin Android - 排序 iBeacon iCollection 导致异常

Question

我正在尝试对 iBeacon 对象的 iCollection 进行排序，但是一旦代码运行，它就会抛出异常。我试图运行的代码如下。它在没有任何排序或排序的情况下工作正常，但我需要能够根据接近度对集合进行排序，如图所示(首先接近度最低，即接近度等于 1):

async void RangingBeaconsInRegion(object sender, RangeEventArgs e)
   {

     if (e.Beacons.Count > 0) 
      {
        var orderedBeacons = e.Beacons.OrderBy(b => b.Proximity); //this causes the problem

      foreach (var beacon1 in orderedBeacons) 
       {
          //do all my stuff here on my ordered beacons
       }
    }
}

异常(exception)情况:

[mono] Unhandled Exception:
[mono] System.ArgumentException: 'jmethod' must not be IntPtr.Zero.
[mono] Parameter name: jmethod
[mono]   at Android.Runtime.JNIEnv.CallObjectMethod (IntPtr jobject, IntPtr jmethod) [0x00000] in <filename unknown>:0 
[mono]   at Android.Runtime.JavaCollection`1[RadiusNetworks.IBeaconAndroid.IBeacon].CopyTo (RadiusNetworks.IBeaconAndroid.IBeacon[] array, Int32 array_index) [0x00000] in <filename unknown>:0 
[mono]   at System.Linq.Enumerable.ToArray[IBeacon] (IEnumerable`1 source) [0x00000] in <filename unknown>:0 
[mono]   at System.Linq.QuickSort`1[RadiusNetworks.IBeaconAndroid.IBeacon]..ctor (IEnumerable`1 source, System.Linq.SortContext`1 context) [0x00000] in <filename unknown>:0 
[mono]   at System.Linq.QuickSort`1+<Sort>c__Iterator0[RadiusNetworks.IBeaconAndroid.IBeacon].MoveNext () [0x00000] in <filename unknown>:0 

请问我如何才能正确订购该系列？

Answer 1

这应该适合您。让我知道进展如何。

var allBeacons = new List<Beacon>();

foreach(var b in e.Beacons)
{
    allBeacons.Add(b);
}

var orderedBeacons = allBeacons.OrderBy(b => b.Proximity);