c# - 将重复键添加到 NameValueCollection

Question

我读过 NameValueCollection 允许添加重复的键，但是当我尝试使用它时，情况似乎并非如此。

我的代码

using (var wb = new WebClient())
{
     var data = new NameValueCollection();
     var sourceData = (List<Dictionary<string, object>>)dic["mapData"];
     var countSource = sourceData.Count;

     foreach (var item in (List<Dictionary<string, object>>)dic["mapData"])
     {
          data.Add("pp", item["Latitude"].ToString() + "," + item["Longitude"].ToString());
     }

     var dataCount = data.Count;
     var response = wb.UploadValues(@"http://dev.virtualearth.net/REST/V1/Imagery/Map/road/?mapArea=" + swLat.ToString() + "," + swLong + "," + neLat + "," + neLong + "&mapSize=800,600&key=" + key, "POST", data);

     return this.LargeJson(new { imageData = CreateBase64Image(response) });
}

我在观察

我的源数据包含 36 个项目

我正在遍历 sourceData 并将项目添加到我的 NameValueCollection 数据中，并添加具有相同键“pp”的项目

我期望在我的数据 NameValueCollection 中有 36 个项目，但我只得到 1 个并且我的所有值都附加到同一个键。

我错过了什么？

Answer 1

这是预期的行为 - 请参阅 the documentation :

If the specified key already exists in the target NameValueCollection instance, the specified value is added to the existing comma-separated list of values in the form "value1,value2,value3". The values are associated with the same key in the target NameValueCollection instance.