我知道我可以通过创建自定义类来解决以下问题，但是可以将以下内容强类型化为List（或任何其他类型）吗？
var x = new object[]
{
new object[] { new Image(), new TextBox(), new FileUpload() },
new object[] { new Image(), new TextBox() , new FileUpload()}
};
以上代码中的对象类型只是举例。
一天结束了，我的大脑有点软了。
编辑：元组？
【问题讨论】：
标签： c# generics list collections strong-typing
是的，通用元组可以工作：
http://sankarsan.wordpress.com/2009/11/29/tuple-in-c-4-0/
var myTuples = new List<Tuple<type1, type2, type3>>();
【讨论】：
var x = new []
{
new
{
Image = new Image(),
TextBox = new TextBox(),
FileUpload = new FileUpload()
},
new
{
Image = new Image(),
TextBox = new TextBox(),
FileUpload = new FileUpload()
}
};
【讨论】：
您没有指定，但看起来您使用的是 System.Web 中的类型？如果是这样，那么可以使用泛型来创建更强类型的集合。例如
List<List<WebControl>> list = new List<List<WebControl>>();
list.Add(new List<WebControl>(new WebControl()[] new Image(), new TextBox(), new FileUpload
() );
list.Add(new List<WebControl>(new WebControl()[] new Image(), new TextBox(), new FileUpload() );
为了获得一个非常强类型的集合，尽管您需要使用Tuple<> 或匿名类型解决方案。
【讨论】：
你可以像你说的那样使用元组。或匿名类型：
var x = new[]
{
new { Image = new Image(), TextBox = new TextBox(), FileUpload = new FileUpload() },
new { Image = new Image(), TextBox = new TextBox(), FileUpload = new FileUpload() }
};
【讨论】：
匿名对象是强类型的。 唯一担心的是您无法知道类型名称（不是直接）。
举个例子（如果太长见谅）：
static void T2( )
{
var x = new
{
a = new { a1 = new Type1( "x.1" ), a2 = new Type2( 1 ), a3 = new Type3( '1' ) },
b = new { b1 = new Type1( "x.2" ), b2 = new Type2( 2 ), b3 = new Type3( '2' ) }
};
var y = new
{
a = new { a1 = new Type1( "y.1" ), a2 = new Type2( 1 ), a3 = new Type3( '1' ) },
b = new { b1 = new Type1( "y.2" ), b2 = new Type2( 2 ), b3 = new Type3( '2' ) }
};
var z = new
{
a = new { a1 = new Type1( "y.1" ), a2 = new Type3( '1' ) },
b = new { b1 = new Type3( 'z' ), b2 = new Type2( 2 ) }
};
Console.WriteLine( new string( '-', 40 ) );
Console.WriteLine( "Anonymous object \"x\" is named {0}.", x.GetType( ) );
Console.WriteLine( "Anonymous object \"y\" is named {0}.", y.GetType( ) );
Console.WriteLine( "Anonymous object \"z\" is named {0}.", z.GetType( ) );
Console.WriteLine( new string( '-', 40 ) );
Console.Write( "Anonymous object \"x\" == \"y\"? " );
Console.WriteLine( x.Equals( y ) ? "Yes" : "No" );
Console.Write( "Anonymous object \"x\" == \"z\"? " );
Console.WriteLine( x.Equals( z ) ? "Yes" : "No" );
var x2 = new
{
a = new { a1 = new Type1( "x.1" ), a2 = new Type2( 1 ), a3 = new Type3( '1' ) },
b = new { b1 = new Type1( "x.2" ), b2 = new Type2( 2 ), b3 = new Type3( '2' ) }
};
Console.Write( "Anonymous object \"x\" == \"x2\"? " );
Console.WriteLine( x.Equals( x2 ) ? "Yes" : "No" );
// Uncomment it to give:
//Error 1 Cannot implicitly convert type 'AnonymousType#1' to 'AnonymousType#2'
#if GiveMeAnError
z = new
{
a = new { a1 = new Type1( "z.1" ), a2 = new Type2( 1 ), a3 = new Type3( '1' ) },
b = new { b1 = new Type1( "z.2" ), b2 = new Type2( 2 ), b3 = new Type3( '2' ) }
};
Console.WriteLine( "Anonymous object \"z\" now is named {0}.", z.GetType( ) );
Console.Write( "Anonymous object \"x\" == \"z\"? " );
Console.WriteLine( x.Equals( z ) ? "Yes" : "No" );
#endif
Console.ReadKey( );
}
它输出：
/*----------------------------------------
Anonymous object "x" is named <>f__AnonymousType2`2[<>f__AnonymousType0`3 [anon_obj.Type1,anon_obj.Type2,anon_obj.Type3],<>f__AnonymousType1`3[anon_obj.Type1,anon_obj.Type2,anon_obj.Type3]].
Anonymous object "y" is named <>f__AnonymousType2`2[<>f__AnonymousType0`3[anon_obj.Type1,anon_obj.Type2,anon_obj.Type3],<>f__AnonymousType1`3[anon_obj.Type1,anon_obj.Type2,anon_obj.Type3]].
Anonymous object "z" is named <>f__AnonymousType2`2[<>f__AnonymousType3`2[anon_obj.Type1,anon_obj.Type3],<>f__AnonymousType4`2[anon_obj.Type3,anon_obj.Type2]].
----------------------------------------
Anonymous object "x" == "y"? No
Anonymous object "x" == "z"? No
Anonymous object "x" == "x2"? Yes*/
每个匿名对象组合都有自己的名称并定义一个唯一的类型。 使用相同类型和类型名称声明的对象属于相同类型，如“x == x2”。
不过，最初的示例很棘手，因为它定义了“object[]”数组，其中包含“object[]”数组。 这边
var x = new object[ ]
{
new object[] { new Type1("x.1"), new Type2(1), new Type3('1') },
new object[] { new Type1("x.2"), new Type2(2) , new Type3('2')}
};
var y = new object[ ]
{
new object[] { new Type1("y.1"), new Type2(1), new Type3('1') },
new object[] { new Type1("y.2"), new Type2(2) , new Type3('2')}
};
var z = new object[ ]
{
new object[] { new Type1("y.1"), new Type3('1') },
new object[] { new Type3('z'), new Type2(2)}
};
都将是相同的type（object[]），并且比较总是通过比较pointers来完成，希望会有所不同。
static void T1( )
{
var x = new object[ ]
{
new object[] { new Type1("x.1"), new Type2(1), new Type3('1') },
new object[] { new Type1("x.2"), new Type2(2) , new Type3('2')}
};
var y = new object[ ]
{
new object[] { new Type1("y.1"), new Type2(1), new Type3('1') },
new object[] { new Type1("y.2"), new Type2(2) , new Type3('2')}
};
var z = new object[ ]
{
new object[] { new Type1("y.1"), new Type3('1') },
new object[] { new Type3('z'), new Type2(2)}
};
Console.WriteLine( new string( '-', 40 ) );
Console.WriteLine( "Anonymous object \"x\" is named {0}.", x.GetType( ) );
Console.WriteLine( "Anonymous object \"y\" is named {0}.", y.GetType( ) );
Console.WriteLine( "Anonymous object \"z\" is named {0}.", z.GetType( ) );
Console.WriteLine( new string( '-', 40 ) );
Console.Write( "Anonymous object \"x\" == \"y\"? " );
Console.WriteLine( x.Equals( y ) ? "Yes" : "No" );
Console.Write( "Anonymous object \"x\" == \"z\"? " );
Console.WriteLine( x.Equals( z ) ? "Yes" : "No" );
var x2 = new object[ ]
{
new object[] { new Type1("x.1"), new Type2(1), new Type3('1') },
new object[] { new Type1("x.2"), new Type2(2) , new Type3('2')}
};
Console.Write( "Anonymous object \"x\" == \"x2\"? " );
Console.WriteLine( x.Equals( x2 ) ? "Yes" : "No" );
z = new object[ ]
{
new object[] { new Type1("x.1"), new Type2(1), new Type3('1') },
new object[] { new Type1("x.2"), new Type2(2) , new Type3('2')}
};
Console.WriteLine( "Anonymous object \"z\" now is named {0}.", z.GetType( ) );
Console.Write( "Anonymous object \"x\" == \"z\"? " );
Console.WriteLine( x.Equals( z ) ? "Yes" : "No" );
Console.Write( "Anonymous object \"x\" == \"z\" (memberwise)? " );
Console.WriteLine(
x[ 0 ].Equals( z[ 0 ] )
&& x[ 1 ].Equals( z[ 1 ] )
? "Yes" : "No" );
Console.ReadKey( );
}
将输出：
/*----------------------------------------
Anonymous object "x" is named System.Object[].
Anonymous object "y" is named System.Object[].
Anonymous object "z" is named System.Object[].
----------------------------------------
Anonymous object "x" == "y"? No
Anonymous object "x" == "z"? No
Anonymous object "x" == "x2"? No
Anonymous object "z" now is named System.Object[].
Anonymous object "x" == "z"? No
Anonymous object "x" == "z" (memberwise)? No
----------------------------------------*/
看到问题了吗？
【讨论】：
如果您使用的是框架 4，Tuple<Image, TextBox, FileUpload>[] 或 List<Tuple<Image, TextBox, FileUpload>> 就可以解决问题。
否则，您可以使用匿名类型，但除此之外可能会很尴尬（因为在有用的情况下您不能声明类型）。
最后，自行开发并不是最棘手的结构。
【讨论】：