本文整理汇总了C#中System.String.Contains方法的典型用法代码示例。如果您正苦于以下问题：C# String.Contains方法的具体用法？C# String.Contains怎么用？C# String.Contains使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.String的用法示例。
在下文中一共展示了String.Contains方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1:
String s = "This is a string.";
String sub1 = "this";
Console.WriteLine("Does '{0}' contain '{1}'?", s, sub1);
StringComparison comp = StringComparison.Ordinal;
Console.WriteLine(" {0:G}: {1}", comp, s.Contains(sub1, comp));
comp = StringComparison.OrdinalIgnoreCase;
Console.WriteLine(" {0:G}: {1}", comp, s.Contains(sub1, comp));输出：
Does 'This is a string.' contain 'this'? Ordinal: False OrdinalIgnoreCase: True
示例2: if
string s1 = "The quick brown fox jumps over the lazy dog";
string s2 = "fox";
bool b = s1.Contains(s2);
Console.WriteLine("'{0}' is in the string '{1}': {2}",
s2, s1, b);
if (b) {
int index = s1.IndexOf(s2);
if (index >= 0)
Console.WriteLine("'{0} begins at character position {1}",
s2, index + 1);
}输出：
'fox' is in the string 'The quick brown fox jumps over the lazy dog': True 'fox begins at character position 17
示例3: Contains
//引入命名空间
using System;
public static class StringExtensions
{
public static bool Contains(this String str, String substring,
StringComparison comp)
{
if (substring == null)
throw new ArgumentNullException("substring",
"substring cannot be null.");
else if (! Enum.IsDefined(typeof(StringComparison), comp))
throw new ArgumentException("comp is not a member of StringComparison",
"comp");
return str.IndexOf(substring, comp) >= 0;
}
}示例4: Main
//引入命名空间
using System;
class MainClass {
public static void Main() {
string str = "abcdefghijk";
if(str.Contains("def"))
Console.WriteLine("The sequence 'def' was found.");
}
}