使用不同的数据类型参数调用相同的方法而不重载 [英] Call same method using different datatype parameters without overloading
问题描述
我想在两个不同的场合调用一个方法。这两种情况通过两种不同类型的参数,它们因数据类型而异。如何实现这一点而不会超载。
这是我的代码
I want to call a method on two separate occasions. The two occasions pass two different types parameters, they differ by datatype. How do i achieve this without overloading.
This is my code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace DifferentDatatypeOfMethods
{
class Program
{
static void Main(string[] args)
{
List<int> intlist = new List<int>();
intlist.Add(2);
intlist.Add(3);
intlist.Add(7);
List<string> stringlist = new List<string>();
stringlist.Add("A");
stringlist.Add("B");
stringlist.Add("C");
Hit(intlist);
Hit(stringlist);
Console.Read();
}
public static void Hit(List<object> a) //doesn't work
{
Console.WriteLine(a[0]);
}
}
}
推荐答案
在这里阅读C#中的变量数据类型(它在那里自Visual Studio 2008 / C#3.0)...
http://msdn.microsoft.com/en-us/library/bb383973(v = vs.120).aspx [ ^ ]
Read here about variable data type in C# (it's there since Visual Studio 2008/C# 3.0)...
http://msdn.microsoft.com/en-us/library/bb383973(v=vs.120).aspx[^]
这是一个开始:
Here's a start:
public static void Hit(IList a)
{
Console.WriteLine(a[0]);
}
您正在使用的两种类型的 List
实现了 IList
界面。
没有看到你在做什么我不能确定,但使用泛型 [ ^ ]看起来可能是一个很好的解决方案。
Both of the types of List
s you're using implement the IList
interface.
Without seeing what else you are doing I can't be sure, but using generics[^] looks like it may be a good solution.
简单方法:
private void TestHit()
{
var intlist = new List<int> {2, 3, 7};
var stringlist = new List<string> {"A", "B", "C"};
Hit(intlist);
Hit(stringlist);
}
private void Hit<T1>(List<T1> theList)
{
if (theList == null) throw new ArgumentNullException("theList");
if (theList.Count == 0) throw new ArgumentOutOfRangeException("theList");
Console.WriteLine(theList[0]);
}
方法'命令通过将占位符名称T1放在方法名称后的尖括号中来声明它使用一个泛型参数。在参数列表中,定义了在调用方法时,T1将在运行时变为的通用List。使用T1是一种常见的约定,但您可以使用任何非保留名称;如果你想写:
The method 'Hit declares it uses one generic parameter by putting the place-holder name "T1" in angle-brackets after the method name. In the parameter list a generic List of whatever 'T1 will become at run-time, as the method is invoked, is defined. Using "T1" is a common convention, but you could use any non-reserved name for it; if you wanted to write:
private void Hit<TypeToBeDetermined>(List<TypeToBeDetermined> theList);
这样就好了,但确实......详细。
That would be just fine, but ... verbose, indeed.
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