[C#]使用Reflection檢查指定類別是否含有預設建構子

namespace ConsoleApplication17 { class Program { static void Main(string[] args) { Console.WriteLine(HasDefaultConstructor1<TestClass1>()); Console.WriteLine(HasDefaultConstructor2<TestClass1>());

		Console.WriteLine(HasDefaultConstructor1<TestClass2>());
		Console.WriteLine(HasDefaultConstructor2<TestClass2>());
	}

	private static Boolean HasDefaultConstructor1<T>()
	{
		var type = typeof (T);
		foreach (var c in type.GetConstructors(BindingFlags.Instance | BindingFlags.Public))
		{
			if (c.GetParameters().Length ==0)
				return true;
		}
		return false;
	}

	private static Boolean HasDefaultConstructor2<T>()
	{
		var type = typeof (T);
		return type.GetConstructor(Type.EmptyTypes) != null;
	}
}

internal class TestClass1
{
	public TestClass1()
	{
			
	}

	public TestClass1(int arg1)
	{
			
	}
}

internal class TestClass2
{
	public TestClass2(int arg1)
	{
			
	}
}

}

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