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                # Compiler Error CS0310 類型“typename”必須是具有公共的無參數構造函數的非抽象類型,才能用作泛型類型或方法“generic”中的參數“parameter” 泛型類型或方法在它的 where 子句中定義了一個新約束,要求任何類型均必須具有公共的無參數構造函數才能用作該泛型類型或方法的類型參數。若要避免此錯誤,請確保類型具有正確的構造函數,或者修改泛型類型或方法的約束子句。 下面的示例生成 CS0310: ``` // CS0310.cs using System; class G<T> where T : new() { T t; public G() { t = new T(); Console.WriteLine(t); } } class B { private B() { } // Try this instead: // public B() { } } class CMain { public static void Main() { G<B> g = new G<B>(); // CS0310 Console.WriteLine(g.ToString()); } } ```
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