[英]XmlException When Parsing Valid XML
I have a WPF application that calls an API and creates an System.Xml.Linq.XDocument
using XDocument.Parse(string)
. 我有一个WPF应用程序,该应用程序调用API并使用
XDocument.Parse(string)
创建System.Xml.Linq.XDocument
。 I am running into a problem where an XmlException
("Root element is missing") is thrown when I try to do this, but my XML is completely valid. 我遇到一个问题,当我尝试执行此操作时会抛出
XmlException
(“根元素丢失”),但是我的XML是完全有效的。 I tried syntax-checking it by calling the API in my browser and checking its syntax, calling the API in my application and Console.WriteLine
ing the response, and using various XML syntax validators (all of which returned no errors). 我尝试通过在浏览器中调用API并检查其语法,然后在应用程序和
Console.WriteLine
调用API来对响应进行语法检查,并使用各种XML语法验证器(所有语法均未返回错误)。
A sample XML response from the API is as follows: 该API的示例XML响应如下:
<?xml version="1.0" encoding="UTF-8"?>
<response>
<event title="Event 1" id="75823347" icon="www.example.com/images/event1-icon.png" uri="www.example.com/rsvp/event1" mode="none" price="10.00" cover="www.example.com/event1-cover.png" enddate="2016-06-01 14:00:00" startdate="2016-06-01 12:00:00" address="1 Example St, Example City State 12345" location="Example Place" description="This is an event" shortdescription="This is an event" theme="auto" color="#FF000000"/>
</response>
This is my application's code: 这是我的应用程序的代码:
public static WebRequest CreateRequest(string baseUrl, string httpMethod, Dictionary<string, string> requestValues) {
var requestItems = requestValues == null ? null : requestValues.Select(pair => string.Format("&{0}={1}", pair.Key, pair.Value));
var requestString = "";
if (requestItems != null)
foreach (var s in requestItems)
requestString += s;
var request = WebRequest.CreateHttp(baseUrl + CredentialRequestString + requestString);
request.Method = httpMethod.ToUpper();
request.ContentType = "application/x-www-form-urlencoded";
request.Credentials = CredentialCache.DefaultCredentials;
return request;
}
public static WebRequest CreateRequest(string apiEndpoint, string endpointParam, int apiVersion, string httpMethod, Dictionary<string, string> requestValues) {
return CreateRequest(string.Format("http://www.example.com/api/v{0}/{1}/{2}", apiVersion, apiEndpoint, endpointParam), httpMethod, requestValues);
}
public static async Task<string> GetResponseFromServer(WebRequest request) {
string s;
using (var response = await request.GetResponseAsync()) {
using (var responseStream = response.GetResponseStream()) {
using (var streamReader = new StreamReader(responseStream)) {
s = streamReader.ReadToEnd();
}
}
}
return s;
}
public static async Task<List<Event>> GetEvents() {
var response = await GetResponseFromServer(CreateRequest("events", "", 1, "GET", null));
Console.WriteLine(response); //validation
var data = XDocument.Parse(response).Root; //XmlException: Root element is mising
return new List<Event>(data.Elements("event").Select(e => Event.FromXml(e.Value)));
}
Why is this happening? 为什么会这样呢?
The following code works 以下代码有效
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
namespace ConsoleApplication1
{
class Program
{
const string FILENAME = @"c:\temp\test.xml";
static void Main(string[] args)
{
var data = XDocument.Load(FILENAME);
Event _event = Event.FromXml(data.Descendants("event").FirstOrDefault());
}
}
public class Event
{
public string title { get ; set; }
public string icon {get; set; }
public string uri { get; set; }
public string mode { get;set; }
public decimal price { get; set; }
public string cover { get; set; }
public DateTime enddate { get; set; }
public DateTime startdate { get; set; }
public string address { get; set; }
public string location { get; set; }
public string description { get; set; }
public string shortdescription { get; set; }
public string theme { get; set; }
public uint color { get; set; }
public static Event FromXml(XElement data)
{
Event _event = new Event();
_event.title = (string)data.Attribute("title");
_event.icon = (string)data.Attribute("icon");
_event.uri = (string)data.Attribute("uri");
_event.mode = (string)data.Attribute("mode");
_event.price = (decimal)data.Attribute("price");
_event.cover = (string)data.Attribute("cover");
_event.enddate = (DateTime)data.Attribute("enddate");
_event.startdate = (DateTime)data.Attribute("startdate");
_event.address = (string)data.Attribute("address");
_event.location = (string)data.Attribute("location");
_event.description = (string)data.Attribute("description");
_event.shortdescription = (string)data.Attribute("shortdescription");
_event.theme = (string)data.Attribute("theme");
_event.color = uint.Parse(data.Attribute("color").Value.Substring(1), System.Globalization.NumberStyles.HexNumber) ;
return _event;
}
}
}
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