无法隐式转换类型system.colllections.generic [英] Cannot implicitly convert type system.colllections.generic

问题描述

我遇到以下错误:

不能将类型'System.Collections.Generic.List>隐式转换为'System.Collections.Generic.List

Cannot implicitly convert type 'System.Collections.Generic.List>' to 'System.Collections.Generic.List

我的代码是:

class Check
{
      public string Text { get; set; }

      public  List<Check> getxml()
      {
          XDocument xdoc = XDocument.Load(@"D:\Web Utf-8 Converter\Categories.xml");

          var list = (from p in xdoc.Descendants("Categories")
                      select p.Elements("name"));

          var listing = list.ToList();

          return listing;
      }
}

在我看来，这就像转换错误.但是我不确定如何转换.请协助.

This seems to me like a conversion error. But I'm not sure how to convert. Kindly assist.

谢谢.

推荐答案

select语句返回System.Xml.Linq.XElement.您的方法的返回类型为List.这些不一样.

the select statement is returning a System.Xml.Linq.XElement. The return type of your method is List. These are not the same.

您可以做的是:

 var list = (from p in xdoc.Descendants("Categories")
     select new Check { Text = p.Elements("name").Value});

但是我认为您的班级Check不应读取xml并存储每个元素的结果.

However I think your class Check should not read the xml and store the results of each element.

您应该宁愿拥有一个具有GetXml方法的"XmlParser"类和一个拥有该信息的"XmlValue"类.即

You should rather have a class "XmlParser" which has the GetXml Method and a class "XmlValue" which holds the information. i.e.

public class XmlValue
{
    public System.Xml.Linq.XElement Element { get; set; }
    public string Text
    {
        get
        {
            if(Element == null) return null;
            return Element.Value;
        }
    }
}

public class XmlParser
{
    public List<XmlValue> GetXml()
    {
        XDocument xdoc = XDocument.Load(@"D:\Web Utf-8 Converter\Categories.xml");

        return xdoc
            .Descendants("Categories")
            .SelectMany(p => p.Elements("name"))
            .Select(p => new XmlValue { Element = p });
            .ToList();
    }
}

void Main()
{
    XmlParser parser = new XmlParser();
    var list = parser.GetXml();
    foreach(var el in list)
        Console.WriteLine(el.Text);
}

这篇关于无法隐式转换类型system.colllections.generic的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！