給定System.Type T，反序列化列表<T>

Question

我有一些我想序列化和反序列化的類。我試圖創建一個函數，給定一個類型（「用戶」，「管理員」，「文章」等）將反序列化文件與這些項目的列表。例如：

/* I want to be able to do this */ 
List<Article> allArticles = GetAllItems(typeof(Article)); 

我無法弄清楚如何實現上述目標，但我設法得到這個工作：

/* BAD: clumsy method - have to pass a (typeof(List<Article>)) 
    instead of typeof(Article) */ 
List<Article> allArticles = (List<Article>)GetAllItems(typeof(List<Article>)); 

/* Then later in the code... */ 
public static IList GetAllItems(System.Type T) 
{ 

    XmlSerializer deSerializer = new XmlSerializer(T); 

    TextReader tr = new StreamReader(GetPathBasedOnType(T)); 
    IList items = (IList) deSerializer.Deserialize(tr); 
    tr.Close(); 

    return items; 
} 

的問題是，我必須通過「醜陋」 typeof(List<Article>)，而不是「漂亮「typeof(Article)。

當我試試這個：

List<User> people = (List<User>)MasterContactLists.GetAllItems(typeof(User)); 

/* Followed by later in the code...*/ 
public static IList GetAllItems(System.Type T) 
{ 
    XmlSerializer deSerializer = new XmlSerializer(typeof(List<T>)); 

    TextReader tr = new StreamReader(GetPathBasedOnType(T)); 
    IList items = (IList)deSerializer.Deserialize(tr); 
    tr.Close(); 

    return items; 
} 

...我得到一個錯誤

/*Error 3 
The type or namespace name 'T' could not be found 
(are you missing a using directive or an assembly reference?) 
on this line: ... = new XmlSerializer(typeof(List<T>)); */ 

問：我怎樣才能解決我GetAllItems()能夠調用函數像這樣並將它返回列表：

List<Article> allArticles = GetAllItems(typeof(Article)); 

謝謝！

Answer 1

你幾乎沒有......你需要聲明一個泛型方法：

public static IList<T> GetAllItems<T>() 
{ 
    XmlSerializer deSerializer = new XmlSerializer(typeof(List<T>)); 

    using(TextReader tr = new StreamReader(GetPathBasedOnType(typeof(T)))) 
    { 
     IList<T> items = (IList<T>)deSerializer.Deserialize(tr); 
    } 

    return items; 
}