等价于Tuple(..NET 4)支持.NET Framework 3.5
本文关键字:NET Framework 支持 Tuple 等价于 | 更新日期: 2023-09-27 18:06:11
在。net Framework 3.5中是否存在一个类相当于。net 4元组?
我想使用它,以便从一个方法返回几个值,而不是创建一个struct
。
不,在。net 3.5中没有。但是创建你自己的代码应该不难。
public class Tuple<T1, T2>
{
public T1 First { get; private set; }
public T2 Second { get; private set; }
internal Tuple(T1 first, T2 second)
{
First = first;
Second = second;
}
}
public static class Tuple
{
public static Tuple<T1, T2> New<T1, T2>(T1 first, T2 second)
{
var tuple = new Tuple<T1, T2>(first, second);
return tuple;
}
}
UPDATE:将静态内容移动到静态类中以允许类型推断。有了这个更新,你可以写像var tuple = Tuple.New(5, "hello");
这样的东西,它会隐式地为你修复类型
我在我的前4个项目中使用这个:
public class Tuple<T1>
{
public Tuple(T1 item1)
{
Item1 = item1;
}
public T1 Item1 { get; set; }
}
public class Tuple<T1, T2> : Tuple<T1>
{
public Tuple(T1 item1, T2 item2) : base(item1)
{
Item2 = item2;
}
public T2 Item2 { get; set; }
}
public class Tuple<T1, T2, T3> : Tuple<T1, T2>
{
public Tuple(T1 item1, T2 item2, T3 item3) : base(item1, item2)
{
Item3 = item3;
}
public T3 Item3 { get; set; }
}
public static class Tuple
{
public static Tuple<T1> Create<T1>(T1 item1)
{
return new Tuple<T1>(item1);
}
public static Tuple<T1, T2> Create<T1, T2>(T1 item1, T2 item2)
{
return new Tuple<T1, T2>(item1, item2);
}
public static Tuple<T1, T2, T3> Create<T1, T2, T3>(T1 item1, T2 item2, T3 item3)
{
return new Tuple<T1, T2, T3>(item1, item2, item3);
}
}
如果您需要它们与。net 4.0具有相同的功能(主要是比较):
static class Tuple
{
public static Tuple<T1, T2> Create<T1, T2>(T1 item1, T2 item2)
{
return new Tuple<T1, T2>(item1, item2);
}
}
[DebuggerDisplay("Item1={Item1};Item2={Item2}")]
class Tuple<T1, T2> : IFormattable
{
public T1 Item1 { get; private set; }
public T2 Item2 { get; private set; }
public Tuple(T1 item1, T2 item2)
{
Item1 = item1;
Item2 = item2;
}
#region Optional - If you need to use in dictionaries or check equality
private static readonly IEqualityComparer<T1> Item1Comparer = EqualityComparer<T1>.Default;
private static readonly IEqualityComparer<T2> Item2Comparer = EqualityComparer<T2>.Default;
public override int GetHashCode()
{
var hc = 0;
if (!object.ReferenceEquals(Item1, null))
hc = Item1Comparer.GetHashCode(Item1);
if (!object.ReferenceEquals(Item2, null))
hc = (hc << 3) ^ Item2Comparer.GetHashCode(Item2);
return hc;
}
public override bool Equals(object obj)
{
var other = obj as Tuple<T1, T2>;
if (object.ReferenceEquals(other, null))
return false;
else
return Item1Comparer.Equals(Item1, other.Item1) && Item2Comparer.Equals(Item2, other.Item2);
}
#endregion
#region Optional - If you need to do string-based formatting
public override string ToString() { return ToString(null, CultureInfo.CurrentCulture); }
public string ToString(string format, IFormatProvider formatProvider)
{
return string.Format(formatProvider, format ?? "{0},{1}", Item1, Item2);
}
#endregion
}
您可以通过nuget安装NetLegacySupport.Tuple
。这是。net 4.5反向移植到。net 2.0和。3.5的Tuple类。
您可以通过Visual Studio中的包管理器或在命令行上使用nuget来安装它。
这是nuget包:
https://www.nuget.org/packages/NetLegacySupport.Tuple是的,有一个叫做System.Collections.Generic.KeyValuePair的类做同样的事情(我认为从。net 2.0开始)
http://msdn.microsoft.com/en-us/library/5tbh8a42.aspx是的,你可以使用Tuple.cs from mono:
你也需要依赖项:
Tuples.cs
IStructuralComparable.cs
IStructuralEquatable.cs
你只要放一个
#define NET_4_0
在每个
前面#if NET_4_0
就是这样了,一个功能完整的System实现。. net 2.0的元组