C# 在字典中读取XML时出错

我有这样一个XML文件：

<APICollection><API name="myapiName" message="myAPIMessage" /></APICollection>

Dictionary<string,string> apiMap = new Dictionary<string,string>();    
XDocument xdoc = XDocument.Load(path);    
apiMap = xdoc.Root.Elements()
              .ToDictionary(a => (string)a.Attribute("apiName"), a => (string)a.Attribute("apiMessage"));

An item with the same key has already been added.

var values = xmlDocument
             .Descendants("API")
             .GroupBy(x => (string)x.Attribute("name"))
             .ToDictionary(x => x.Key, 
                           x => (string)x.First().Attribute("message"));

XDocument xdoc = XDocument.Load(path);    
var apiMap = xdoc.Root.Elements()
                 .Select(a => new
                     {
                         ApiName = (string)a.Attribute("apiName"),
                         ApiMessage = (string)a.Attribute("apiMessage")
                     });
var duplicateKeys = (from x in apiMap
                     group x by x.ApiName into g
                     select new { ApiName = g.Key, Cnt = g.Count() })
                     .Where(x => x.Cnt > 1)
                     .Select(x => x.ApiName);
if (duplicateKeys.Count() > 0)
    throw new InvalidOperationException("The following keys are present more than once: " 
            + string.Join(", ", duplicateKeys));

Dictionary<string, string> apiMapDict = 
    apiMap.ToDictionary(a => a.ApiName, a => a.ApiMessage);

我想知道我能做些什么来修改错误消息，以至少提供多次出现的密钥。有人能帮忙吗

谢谢

---

Harit

属性方法采用属性名称，而不是值。用属性名称替换这些值。还可以使用

Value

属性获取属性的值

即使这样做，作为键使用的属性值也必须是唯一的，因为您使用的是

字典

Dictionary apiMap=newdictionary（）；
XDocument xdoc=XDocument.Load（路径）；
apiMap=xdoc.Root.Elements（）
.ToDictionary（a=>a.Attribute（“name”）.Value
，a=>a.Attribute（“message”）.Value）；

试试这个：

var xmlDocument = XDocument.Load(path); 
var values = xmlDocument
             .Descendants("API")
             .GroupBy(x => (string)x.Attribute("name"))
             .ToDictionary(x => x.Key, 
                           x => x.Select(p => (string)p.Attribute("message").ToList());

这将为您提供一个

字典

，键是名称，值是属于Api名称的消息。如果您只需要字典，请按如下方式更改代码：

<APICollection><API name="myapiName" message="myAPIMessage" /></APICollection>

Dictionary<string,string> apiMap = new Dictionary<string,string>();    
XDocument xdoc = XDocument.Load(path);    
apiMap = xdoc.Root.Elements()
              .ToDictionary(a => (string)a.Attribute("apiName"), a => (string)a.Attribute("apiMessage"));

An item with the same key has already been added.

var values = xmlDocument
             .Descendants("API")
             .GroupBy(x => (string)x.Attribute("name"))
             .ToDictionary(x => x.Key, 
                           x => (string)x.First().Attribute("message"));

XDocument xdoc = XDocument.Load(path);    
var apiMap = xdoc.Root.Elements()
                 .Select(a => new
                     {
                         ApiName = (string)a.Attribute("apiName"),
                         ApiMessage = (string)a.Attribute("apiMessage")
                     });
var duplicateKeys = (from x in apiMap
                     group x by x.ApiName into g
                     select new { ApiName = g.Key, Cnt = g.Count() })
                     .Where(x => x.Cnt > 1)
                     .Select(x => x.ApiName);
if (duplicateKeys.Count() > 0)
    throw new InvalidOperationException("The following keys are present more than once: " 
            + string.Join(", ", duplicateKeys));

Dictionary<string, string> apiMapDict = 
    apiMap.ToDictionary(a => a.ApiName, a => a.ApiMessage);

---

我建议不要直接创建字典，而是首先检查重复键，如下所示：

<APICollection><API name="myapiName" message="myAPIMessage" /></APICollection>

Dictionary<string,string> apiMap = new Dictionary<string,string>();    
XDocument xdoc = XDocument.Load(path);    
apiMap = xdoc.Root.Elements()
              .ToDictionary(a => (string)a.Attribute("apiName"), a => (string)a.Attribute("apiMessage"));

An item with the same key has already been added.

var values = xmlDocument
             .Descendants("API")
             .GroupBy(x => (string)x.Attribute("name"))
             .ToDictionary(x => x.Key, 
                           x => (string)x.First().Attribute("message"));

XDocument xdoc = XDocument.Load(path);    
var apiMap = xdoc.Root.Elements()
                 .Select(a => new
                     {
                         ApiName = (string)a.Attribute("apiName"),
                         ApiMessage = (string)a.Attribute("apiMessage")
                     });
var duplicateKeys = (from x in apiMap
                     group x by x.ApiName into g
                     select new { ApiName = g.Key, Cnt = g.Count() })
                     .Where(x => x.Cnt > 1)
                     .Select(x => x.ApiName);
if (duplicateKeys.Count() > 0)
    throw new InvalidOperationException("The following keys are present more than once: " 
            + string.Join(", ", duplicateKeys));

Dictionary<string, string> apiMapDict = 
    apiMap.ToDictionary(a => a.ApiName, a => a.ApiMessage);

XDocument xdoc=XDocument.Load（路径）；
var apiMap=xdoc.Root.Elements（）
.选择（a=>新建
{
ApiName=（字符串）a.Attribute（“ApiName”），
ApiMessage=（字符串）a.Attribute（“ApiMessage”）
});
var duplicateKeys=（来自apiMap中的x）
按x.ApiName将x分组为g
选择新{ApiName=g.Key，Cnt=g.Count（）}）
.其中（x=>x.Cnt>1）
.选择（x=>x.ApiName）；
如果（duplicateKeys.Count（）>0）
抛出新的InvalidOperationException（“以下键多次出现：”
+Join（“，”，duplicateKeys））；
字典apiMapDict=
ToDictionary（a=>a.ApiName，a=>a.ApiMessage）；

请注意，我已经更改了代码，您的示例（“名称”、“消息”）中的属性名称与代码示例（“apiName”、“apiMessage”）中的属性名称存在差异