根据xml错误{“值不能为空。\\ r \\ n参数名称：元素”}创建对象

Question

I need to create a list of objects parsing an XML document. Issue appears when projecting to AdvertisementFullScreen

I receive this error:

{"Value cannot be null.\r\nParameter name: element"}

My code:

var advFs = loadedData.Element("xxx")
                           .Elements("advertisementsFullScreen")
                           .Elements("advertisement") // RESULT BELOW
                           .Select(x=>new AdvertisementFullScreen()
                           {
                               Id = (int)x.Element("id"),
                               ImageUrl = (string)x.Element("imageUrl"),
                               DisplayTime = new TimeSpan(0, 0, (int)x.Element("displayTime"))
                           }).ToList();

Result before projecting is:

[0] = <advertisement id="7001" imageUrl="C:/xxx/Test-data/data-offline/Assets/advertisementsFullScreen/1.png" displayTime="5" isSelfPromo="1"></advertisement>

Answer 1

You're selecting Element() , but id, imageUrl, displayTime are not elements - they're attributes.

Modified query (just the important parts):

Id = (int)x.Attribute("id"),
ImageUrl = (string)x.Attribute("imageUrl"),
DisplayTime = new TimeSpan(0, 0, (int)x.Attribute("displayTime"))