In C#, String.Contains() is a string method. This method is used to check whether the substring occurs within a given string or not.
It returns the boolean value. If substring exists in string or value is the empty string (“”), then it returns True, otherwise returns False.
Exception − This method can give ArgumentNullException if str is null.
This method performs the case-sensitive checking. The search will always begin from the first character position of the string and continues until the last character position.
Example 1
Contains is case sensitive if the string is found it return true else false
static void Main(string[] args){
string[] strs = { "Sachin", "India", "Bangalore", "Karnataka", "Delhi" };
if (strs.Contains("sachin")){
System.Console.WriteLine("String Present");
} else {
System.Console.WriteLine("String Not Present");
}
Console.ReadLine();
}
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输出
String Not Present
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Example 2
static void Main(string[] args){
string[] strs = { "Sachin", "India", "Bangalore", "Karnataka", "Delhi" };
if (strs.Contains("Sachin")){
System.Console.WriteLine("String Present");
} else {
System.Console.WriteLine("String Not Present");
}
Console.ReadLine();
}
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输出
String Present
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Example 3
的中文翻译为：
示例 3
static void Main(string[] args){
string[] strs = { "Sachin", "India", "Bangalore", "Karnataka", "Delhi" };
var res = strs.Where(x => x == "Sachin").FirstOrDefault();
System.Console.WriteLine(res);
Console.ReadLine();
}
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输出
Sachin
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Example 4
的中文翻译为：
示例4
static void Main(string[] args){
string[] strs = { "Sachin", "India", "Bangalore", "Karnataka", "Delhi" };
foreach (var item in strs){
if (item == "Sachin"){
System.Console.WriteLine("String is present");
}
}
Console.ReadLine();
}
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输出
String is present
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