假设我需要比较字符串x是"A","B"还是"C".
使用Python,我可以使用运算符来轻松检查.
if x in ["A","B","C"]:
do something
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使用C#,我可以做到
if (String.Compare(x, "A", StringComparison.OrdinalIgnoreCase) || ...)
do something
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它可以与Python更相似吗?
我需要添加System.Linq以便使用不区分大小写的Contain().
using System;
using System.Linq;
using System.Collections.Generic;
class Hello {
public static void Main() {
var x = "A";
var strings = new List<string> {"a", "B", "C"};
if (strings.Contains(x, StringComparer.OrdinalIgnoreCase)) {
Console.WriteLine("hello");
}
}
}
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要么
using System;
using System.Linq;
using System.Collections.Generic;
static class Hello {
public static bool In(this string source, params string[] list)
{
if (null == source) throw new ArgumentNullException("source");
return list.Contains(source, StringComparer.OrdinalIgnoreCase);
}
public static void Main() {
string x = "A";
if (x.In("a", "B", "C")) {
Console.WriteLine("hello");
}
}
}
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jas*_*son 30
使用Enumerable.Contains<T>这是一种扩展方法IEnumerable<T>:
var strings = new List<string> { "A", "B", "C" };
string x = // some string
bool contains = strings.Contains(x, StringComparer.OrdinalIgnoreCase);
if(contains) {
// do something
}
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adr*_*anm 24
if ((new[]{"A","B","C"}).Contains(x, StringComparer.OrdinalIgnoreCase))
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Khe*_*pri 10
为什么是这样,StackOverflow上有一个经典的线程,它带有一个扩展方法,可以完全满足您的需求.
public static bool In<T>(this T source, params T[] list)
{
if(null==source) throw new ArgumentNullException("source");
return list.Contains(source);
}
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编辑以回应下面的评论:如果您只关注字符串,那么:
public static bool In(this string source, params string[] list)
{
if (null == source) throw new ArgumentNullException("source");
return list.Contains(source, StringComparer.OrdinalIgnoreCase);
}
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这导致您熟悉的语法:
if(x.In("A","B","C"))
{
// do something....
}
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请注意,这几乎与其他人仅使用最接近您提到的语法发布的内容完全相同.