Linq - 无法隐式转换类型'System.Collections.Generic.IEnumerable答案

【问题标题】：Linq - Cannot implicitly convert type 'System.Collections.Generic.IEnumerableLinq - 无法隐式转换类型'System.Collections.Generic.IEnumerable
【发布时间】：2013-10-07 13:58:45
【问题描述】：

我收到以下错误：

Cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'Munchkin.Model.PlayerProfiles.Profile'. An explicit conversion exists (are you missing a cast?)

我的代码是：

Profile currentProfile;

public Profile ActiveProfile()
{
    currentProfile = new Profile();        
    return currentProfile = 
        (from profiles in xmlDoc.Element("PlayerPofiles").Element("Online").Elements("Player")
        where (string)profiles.Element("Active") == "True"
        select new Profile
        {
            Name = (string)profiles.Element("Name"),
            Sex = (string)profiles.Element("Sex"),
            Avatar = (string)profiles.Element("Avatar").Attribute("path") ?? "",
            Created = (DateTime)profiles.Element("Created"),
            Birthday = (string)profiles.Element("Birthday"),
            Wins = (string)profiles.Element("Ratio").Element("Win"),
            Losses = (string)profiles.Element("Ratio").Element("Loss"),
            Abandoned = (string)profiles.Element("Ratio").Element("Abandoned")
        });
}

【问题讨论】：

标签： c# linq error-handling implicit-conversion

【解决方案1】：

public Profile ActiveProfile()
        {
            currentProfile = new Profile();

           return currentProfile = (from profiles in xmlDoc.Element("PlayerPofiles").Element("Online").Elements("Player")
                            where (string)profiles.Element("Active") == "True"
                            select new Profile
                              {
                                  Name = (string)profiles.Element("Name"),
                                  Sex = (string)profiles.Element("Sex"),
                                  Avatar = (string)profiles.Element("Avatar").Attribute("path") ?? "",
                                  Created = (DateTime)profiles.Element("Created"),
                                  Birthday = (string)profiles.Element("Birthday"),
                                  Wins = (string)profiles.Element("Ratio").Element("Win"),
                                  Losses = (string)profiles.Element("Ratio").Element("Loss"),
                                  Abandoned = (string)profiles.Element("Ratio").Element("Abandoned")
                              }).FirstOrDefault();
        }

由于您的 currentProfile 是单个配置文件项，因此查询分配配置文件集合，这就是出现此错误的原因。尝试使用 FirstOrDefault()

【讨论】：

感谢 Dotnetstep... 修复了它。
你应该省略这行currentProfile = new Profile();，完全没有必要，该方法也应该返回Profile
谢谢@KrisIvanov - 我已经删除了第一行。我很困惑，为什么它应该返回 Profile 而不是 currentProfile？
我的建议是删除currentProfile = new Profile(); 行，因为Profile 的创建会在下一行被覆盖