使用Bing Maps REST API的Optimization API来进行路线优化。

示例代码：

1. 创建一组路线点

var addressList = new List {
    "1600 Amphitheatre Parkway, Mountain View, CA",
    "1 Infinite Loop, Cupertino, CA",
    "1555 Blake Street, Denver, CO",
    "701 7th Ave, New York, NY",
    "770 Broadway, New York, NY"
};

2. 将地址转换为坐标点

var coordinates = new List();

foreach (var address in addressList) {
    var requestUrl = $"http://dev.virtualearth.net/REST/v1/Locations?q={address}&key={BingMapsApiKey}";
    var json = await httpClient.GetStringAsync(requestUrl);
    var result = JsonConvert.DeserializeObject(json);

    if (result.ResourceSets.Length > 0 && result.ResourceSets[0].Resources.Length > 0) {
        var point = result.ResourceSets[0].Resources[0].Point;
        coordinates.Add(new Coordinate { Latitude = point.Coordinates[0], Longitude = point.Coordinates[1] });
    }
}

3. 使用Bing Maps REST API的Optimization API进行路线优化

var coordinatesParam = string.Join(";", coordinates.Select(c => $"{c.Latitude},{c.Longitude}"));
var requestUrl = $"https://dev.virtualearth.net/REST/v1/Routes/OptimizeItinerary?key={BingMapsApiKey}&waypoint.1={coordinatesParam}&distanceUnit=mi&optimizeOrder=true";
var json = await httpClient.GetStringAsync(requestUrl);
var result = JsonConvert.DeserializeObject(json);

if (result.ResourceSets.Length > 0 && result.ResourceSets[0].Resources.Length > 0) {
    var optimizedCoordinates = result.ResourceSets[0].Resources[0].RoutePath.Line.Coordinates;
    var optimizedAddressList = new List();

    foreach (var optimizedCoordinate in optimizedCoordinates) {
        var requestUrl = $"http://dev.virtualearth.net/REST/v1/Locations/{optimizedCoordinate[0]},{optimizedCoordinate[1]}?key={BingMapsApiKey}";
        var json = await httpClient.GetStringAsync(requestUrl);
        var result = JsonConvert.DeserializeObject(json);

        if (result.ResourceSets.Length > 0 && result.ResourceSets[0].Resources.Length > 0) {
            var address = result.ResourceSets[0].Resources[0].Address.FormattedAddress;
            optimizedAddressList.Add(address);
        }
    }
}