我无法实际访问此未记录的类中的成员:BingMapsRESTToolkit.Response
[各个地方的代码(例如)Bing Maps REST Services Toolkit - Access Value Outside of Delegate似乎从MSDN复制了无效的示例。
例如,此方法无法访问Response对象中包含的Snapped坐标数组。将rez分配给响应的类型所在的行为空。
private List<Coordinate> MapSnaps(List<Coordinate> coordinates)
{
// Build our request object
var req = new SnapToRoadRequest();
req.BingMapsKey = _sessionKey;
req.UserRegion = "US";
req.SpeedUnit = SpeedUnitType.MPH;
req.TravelMode = TravelModeType.Driving;
req.Points = coordinates;
var response = req.Execute().GetAwaiter().GetResult();
if(response != null &&
response.ResourceSets != null &&
response.ResourceSets.Length > 0 &&
response.ResourceSets[0].Resources != null &&
response.ResourceSets[0].Resources.Length > 0)
{
// rez gets nothing, results in null because the two objects are nothing alike
var rez = response.ResourceSets[0].Resources[0] as BingMapsRESTToolkit.Location;
// Snaps has 69 SnappedPoint items, but the member as shown in the debug window
// SnappedPoints under snaps cant be accessed in code - just in debugger
var snaps = response.ResourceSets[0].Resources[0]; //
Console.WriteLine("-.-"); // <-- breakpoint here
}
// TODO: Once we get this response snafu sorted, convert and return
// matching list of road-snapped coordinates to caller...
return ConvertToCoords(response);
}
[当我使用Visual Studio 2019进行调试时,它清楚地表明有69个'SnappedPoint'值正在等待响应中使用。ResourceSet[0] .Resources [0]-但我无法理解。这是调试器显示的内容:
snaps BingMapsRESTToolkit.SnappedPoint [69]
SnappedPoints BingMapsRESTToolkit.SnappedPoint[69]
BoundingBox null
Type null
Each member of the SnappedPoints array contains:
Coordinate {Lat:double, Lon:double}
Index int
Name String for name of road
SpeedLimit double?
TruckSpeedLimit double?
正在尝试:snaps.SnappedPoints [x]不起作用,因为该成员不存在。 BoundingBox和Type都可以访问,并且都设置为null,但是我看不到访问SnappedPoints内容的方法。没有智能,手动输入成员名称只会导致错误。
我在这里错了吗?
Response对象可以根据初始请求采用多种对象类型。
为了访问SnappedPoints数组,必须将Response强制转换为SnapToRoadResponse类型,例如:
var snaps = response.ResourceSets[0].Resources[0] as SnapToRoadResponse;
这有点丑陋,但确实有效。