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                # Compiler Error CS0417 “identifier”:創建變量類型的實例時無法提供參數 如果對類型參數上的 **new**的調用帶有參數,則會發生此錯誤。通過在未知參數類型上的使用**new**,可以被調用的唯一構造函數是不帶參數的。如果需要調用另一個構造函數,請考慮使用類類型約束或接口約束。 下面的示例生成 CS0417: ``` // CS0417 class ExampleClass<T> where T : new() { // The following line causes CS0417. T instance1 = new T(1); // The following line doesn't cause the error. T instance2 = new T(); } ``` ## 請參閱 [類型參數的約束(C# 編程指南)](https://msdn.microsoft.com/zh-cn/library/d5x73970.aspx)
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