列表<T>要求「1」類型參數

我在通過這本書列表<T>要求「1」類型參數

http://hookedonlinq.com/LINQBook.ashx

然而，當我嘗試去的過程和實現此代碼

public class Contact 
{ 
    public string FirstName { get; set; } 
    public string LastName { get; set; } 
    public string Email { get; set; } 
    public string Phone { get; set; } 
    public DateTime DateOfBirth { get; set; } 
    public string State { get; set; } 

    public static List SampleData() 
    { 
     return new List { 
      new Contact { FirstName = "Barney", LastName = "Gottshall", DateOfBirth = new DateTime(1945,10,19), Phone = "885 983 8858", Email = "[email protected]–technology.com", State = "CA" }, 
      new Contact { FirstName = "Armando", LastName = "Valdes", DateOfBirth = new DateTime(1973,12,09), Phone = "848 553 8487", Email = "[email protected]–technology.com", State = "WA" }, 
      new Contact { FirstName = "Adam", LastName = "Gauwain", DateOfBirth = new DateTime(1959,10,03), Phone = "115 999 1154", Email = "[email protected]–technology.com", State = "AK" }, 
      new Contact { FirstName = "Jeffery", LastName = "Deane", DateOfBirth = new DateTime(1950,12,16), Phone = "677 602 6774", Email = "[email protected]–technology.com", State = "CA" }, 
      new Contact { FirstName = "Collin", LastName = "Zeeman", DateOfBirth = new DateTime(1935,02,10), Phone = "603 303 6030", Email = "[email protected]–technology.com", State = "FL" }, 
      new Contact { FirstName = "Stewart", LastName = "Kagel", DateOfBirth = new DateTime(1950,02,20), Phone = "546 607 5462", Email = "[email protected]–technology.com", State = "WA" }, 
      new Contact { FirstName = "Chance", LastName = "Lard", DateOfBirth = new DateTime(1951,10,21), Phone = "278 918 2789", Email = "[email protected]–technology.com", State = "WA" }, 
      new Contact { FirstName = "Blaine", LastName = "Reifsteck", DateOfBirth = new DateTime(1946,05,18), Phone = "715 920 7157", Email = "[email protected]–technology.com", State = "TX" }, 
      new Contact { FirstName = "Mack", LastName = "Kamph", DateOfBirth = new DateTime(1977,09,17), Phone = "364 202 3644", Email = "[email protected]–technology.com", State = "TX" }, 
      new Contact { FirstName = "Ariel", LastName = "Hazelgrove", DateOfBirth = new DateTime(1922,05,23), Phone = "165 737 1656", Email = "[email protected]–technology.com", State = "OR" } }; 
    } 
}

我得到的錯誤系統。 Collections.Generic.List要求「1」類型參數我明白列表需要被定義爲如

List<string>

或

List<int>

但無法確定列表應該是什麼。誰能幫忙？

感謝

來源

2014-10-06 tramp-man

我認爲你必須指定列表的類型.. – User2012384 2014-10-06 08:23:29

看看我的回答 – User2012384 2014-10-06 08:26:19

補充說明：在看鏈接書的頁面的HTML源文件，你可以看到，它並指定'名單'，但'<' and '>'沒有被正確的HTML編碼，所以它不顯示在瀏覽器中。看起來像是一本編程書籍的監督！也可能值得聯繫作者... – 2014-10-06 09:50:39

public static List<Contact> SampleData()

...

return new List<Contact> { ....

...因爲你把到列表中的對象是Contact小號

一個簡單的方法來思考是仿製藥通過使用單詞「的」，例如List<Contact>與說「聯繫人列表」相同

來源

2014-10-06 08:24:00

和'public static List SampleData（）' – Matt 2014-10-06 08:25:08

您忘記指定列表的類型。

public static List<Contact> SampleData() 
    { 
     return new List<Contact> { 
      new Contact { FirstName = "Barney", LastName = "Gottshall", DateOfBirth = new DateTime(1945,10,19), Phone = "885 983 8858", Email = "[email protected]–technology.com", State = "CA" }, 
      new Contact { FirstName = "Armando", LastName = "Valdes", DateOfBirth = new DateTime(1973,12,09), Phone = "848 553 8487", Email = "[email protected]–technology.com", State = "WA" }, 
      new Contact { FirstName = "Adam", LastName = "Gauwain", DateOfBirth = new DateTime(1959,10,03), Phone = "115 999 1154", Email = "[email protected]–technology.com", State = "AK" }, 
      new Contact { FirstName = "Jeffery", LastName = "Deane", DateOfBirth = new DateTime(1950,12,16), Phone = "677 602 6774", Email = "[email protected]–technology.com", State = "CA" }, 
      new Contact { FirstName = "Collin", LastName = "Zeeman", DateOfBirth = new DateTime(1935,02,10), Phone = "603 303 6030", Email = "[email protected]–technology.com", State = "FL" }, 
      new Contact { FirstName = "Stewart", LastName = "Kagel", DateOfBirth = new DateTime(1950,02,20), Phone = "546 607 5462", Email = "[email protected]–technology.com", State = "WA" }, 
      new Contact { FirstName = "Chance", LastName = "Lard", DateOfBirth = new DateTime(1951,10,21), Phone = "278 918 2789", Email = "[email protected]–technology.com", State = "WA" }, 
      new Contact { FirstName = "Blaine", LastName = "Reifsteck", DateOfBirth = new DateTime(1946,05,18), Phone = "715 920 7157", Email = "[email protected]–technology.com", State = "TX" }, 
      new Contact { FirstName = "Mack", LastName = "Kamph", DateOfBirth = new DateTime(1977,09,17), Phone = "364 202 3644", Email = "[email protected]–technology.com", State = "TX" }, 
      new Contact { FirstName = "Ariel", LastName = "Hazelgrove", DateOfBirth = new DateTime(1922,05,23), Phone = "165 737 1656", Email = "[email protected]–technology.com", State = "OR" } }; 
    }

來源

2014-10-06 08:25:51 User2012384

列表<T>要求「1」類型參數

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