我想使用c#检查字符串值是否包含字符串数组中的单词。例如,
string stringToCheck = "text1text2text3";
string[] stringArray = { "text1", "someothertext", etc... };
if(stringToCheck.contains stringArray) //one of the items?
{
}
我如何检查字符串值'stringToCheck'是否包含数组中的一个词?
当前回答
你可以定义自己的string.ContainsAny()和string.ContainsAll()方法。作为奖励，我甚至还抛出了一个string.Contains()方法，该方法允许不区分大小写的比较等等。
public static class Extensions
{
public static bool Contains(this string source, string value, StringComparison comp)
{
return source.IndexOf(value, comp) > -1;
}
public static bool ContainsAny(this string source, IEnumerable<string> values, StringComparison comp = StringComparison.CurrentCulture)
{
return values.Any(value => source.Contains(value, comp));
}
public static bool ContainsAll(this string source, IEnumerable<string> values, StringComparison comp = StringComparison.CurrentCulture)
{
return values.All(value => source.Contains(value, comp));
}
}
你可以用下面的代码进行测试:
public static void TestExtensions()
{
string[] searchTerms = { "FOO", "BAR" };
string[] documents = {
"Hello foo bar",
"Hello foo",
"Hello"
};
foreach (var document in documents)
{
Console.WriteLine("Testing: {0}", document);
Console.WriteLine("ContainsAny: {0}", document.ContainsAny(searchTerms, StringComparison.OrdinalIgnoreCase));
Console.WriteLine("ContainsAll: {0}", document.ContainsAll(searchTerms, StringComparison.OrdinalIgnoreCase));
Console.WriteLine();
}
}
其他回答
也许是这样的:
string stringToCheck = "text1text2text3";
string[] stringArray = new string[] { "text1" };
if (Array.Exists<string>(stringArray, (Predicate<string>)delegate(string s) {
return stringToCheck.IndexOf(s, StringComparison.OrdinalIgnoreCase) > -1; })) {
Console.WriteLine("Found!");
}
你也可以像Anton Gogolev建议的那样，检查stringArray1中的任何项是否与stringArray2中的任何项匹配:
using System.Linq;
if(stringArray1.Any(stringArray2.Contains))
同样，stringArray1中的所有项都匹配stringArray2中的所有项:
using System.Linq;
if(stringArray1.All(stringArray2.Contains))
试试这个。没有任何循环的需要。
string stringToCheck = "text1";
List<string> stringList = new List<string>() { "text1", "someothertext", "etc.." };
if (stringList.Exists(o => stringToCheck.Contains(o)))
{
}
你可以定义自己的string.ContainsAny()和string.ContainsAll()方法。作为奖励，我甚至还抛出了一个string.Contains()方法，该方法允许不区分大小写的比较等等。
public static class Extensions
{
public static bool Contains(this string source, string value, StringComparison comp)
{
return source.IndexOf(value, comp) > -1;
}
public static bool ContainsAny(this string source, IEnumerable<string> values, StringComparison comp = StringComparison.CurrentCulture)
{
return values.Any(value => source.Contains(value, comp));
}
public static bool ContainsAll(this string source, IEnumerable<string> values, StringComparison comp = StringComparison.CurrentCulture)
{
return values.All(value => source.Contains(value, comp));
}
}
你可以用下面的代码进行测试:
public static void TestExtensions()
{
string[] searchTerms = { "FOO", "BAR" };
string[] documents = {
"Hello foo bar",
"Hello foo",
"Hello"
};
foreach (var document in documents)
{
Console.WriteLine("Testing: {0}", document);
Console.WriteLine("ContainsAny: {0}", document.ContainsAny(searchTerms, StringComparison.OrdinalIgnoreCase));
Console.WriteLine("ContainsAll: {0}", document.ContainsAll(searchTerms, StringComparison.OrdinalIgnoreCase));
Console.WriteLine();
}
}
演示了三个选项。我认为第三条是最简洁的。
class Program {
static void Main(string[] args) {
string req = "PUT";
if ((new string[] {"PUT", "POST"}).Any(s => req.Contains(s))) {
Console.WriteLine("one.1.A"); // IS TRUE
}
req = "XPUT";
if ((new string[] {"PUT", "POST"}).Any(s => req.Contains(s))) {
Console.WriteLine("one.1.B"); // IS TRUE
}
req = "PUTX";
if ((new string[] {"PUT", "POST"}).Any(s => req.Contains(s))) {
Console.WriteLine("one.1.C"); // IS TRUE
}
req = "UT";
if ((new string[] {"PUT", "POST"}).Any(s => req.Contains(s))) {
Console.WriteLine("one.1.D"); // false
}
req = "PU";
if ((new string[] {"PUT", "POST"}).Any(s => req.Contains(s))) {
Console.WriteLine("one.1.E"); // false
}
req = "POST";
if ((new string[] {"PUT", "POST"}).Any(s => req.Contains(s))) {
Console.WriteLine("two.1.A"); // IS TRUE
}
req = "ASD";
if ((new string[] {"PUT", "POST"}).Any(s => req.Contains(s))) {
Console.WriteLine("three.1.A"); // false
}
Console.WriteLine("-----");
req = "PUT";
if (Array.IndexOf((new string[] {"PUT", "POST"}), req) >= 0) {
Console.WriteLine("one.2.A"); // IS TRUE
}
req = "XPUT";
if (Array.IndexOf((new string[] {"PUT", "POST"}), req) >= 0) {
Console.WriteLine("one.2.B"); // false
}
req = "PUTX";
if (Array.IndexOf((new string[] {"PUT", "POST"}), req) >= 0) {
Console.WriteLine("one.2.C"); // false
}
req = "UT";
if (Array.IndexOf((new string[] {"PUT", "POST"}), req) >= 0) {
Console.WriteLine("one.2.D"); // false
}
req = "PU";
if (Array.IndexOf((new string[] {"PUT", "POST"}), req) >= 0) {
Console.WriteLine("one.2.E"); // false
}
req = "POST";
if (Array.IndexOf((new string[] {"PUT", "POST"}), req) >= 0) {
Console.WriteLine("two.2.A"); // IS TRUE
}
req = "ASD";
if (Array.IndexOf((new string[] {"PUT", "POST"}), req) >= 0) {
Console.WriteLine("three.2.A"); // false
}
Console.WriteLine("-----");
req = "PUT";
if ((new string[] {"PUT", "POST"}.Contains(req))) {
Console.WriteLine("one.3.A"); // IS TRUE
}
req = "XPUT";
if ((new string[] {"PUT", "POST"}.Contains(req))) {
Console.WriteLine("one.3.B"); // false
}
req = "PUTX";
if ((new string[] {"PUT", "POST"}.Contains(req))) {
Console.WriteLine("one.3.C"); // false
}
req = "UT";
if ((new string[] {"PUT", "POST"}.Contains(req))) {
Console.WriteLine("one.3.D"); // false
}
req = "PU";
if ((new string[] {"PUT", "POST"}.Contains(req))) {
Console.WriteLine("one.3.E"); // false
}
req = "POST";
if ((new string[] {"PUT", "POST"}.Contains(req))) {
Console.WriteLine("two.3.A"); // IS TRUE
}
req = "ASD";
if ((new string[] {"PUT", "POST"}.Contains(req))) {
Console.WriteLine("three.3.A"); // false
}
Console.ReadKey();
}
}
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