錯誤試圖通過Linq和Mvc Web API傳遞IEnumerable列表

Question

我試圖從Linq方法返回列表的結果，但我得到一個錯誤，說我「不能將我的類轉換爲通用列表我使用得到...方法

將非常感激，如果有人可以幫助我這個

這是我的寵物蛋類：。

public class Tamagotchi 
{ 
    public string Name { get; set; } 
    public DateTime Born { get; set; } 
    public int Health { get; set; } 
} 

這是API：

public class SomeController : ApiController 
{ 
    List<Tamagotchi> Gotchis = new List<Tamagotchi> 
    { 
     new Tamagotchi { Born = DateTime.Now.AddYears(-5), Health = 30, Name = "XTP" }, 
     new Tamagotchi { Born = DateTime.Now.AddYears(-4), Health = 49, Name = "ZQX" }, 
     new Tamagotchi { Born = DateTime.Now.AddYears(-3), Health = 15, Name = "VBR" }, 
     new Tamagotchi { Born = DateTime.Now.AddYears(-2), Health = 87, Name = "BNQP" }, 
     new Tamagotchi { Born = DateTime.Now.AddYears(-1), Health = 62, Name = "VLW" }, 
    }; 

    public IEnumerable<Tamagotchi> Get2() 
    { 
     var _result = Gotchis.SingleOrDefault(tama => tama.Name == "VLW"); 
     return _result; 
    } 
} 

謝謝！

/克里斯

Answer 1

的SingleOrDefault會返回一個Tamagutchi，所以結果不能作爲IEnumerable的。也許你的意思是

public Tamagotchi Get2() 
{ 

    var _result = Gotchis.SingleOrDefault(tama => tama.Name == "VLW"); 

    return _result; 
} 

或

public IEnumerable<Tamagotchi> Get2() 
{ 

    var _result = Gotchis.Where(tama => tama.Name == "VLW"); 

    return _result; 
}