#98 – Using an Indexer to Get a Specific Character In a String

In C#, you can use the indexer operator [ ], to get a specified character in a string.

The indexer takes a zero-based integer as an index into the string.  0 returns the first character and n-1 (where n is the length of the string) returns the last character.

 string s = "ABCDE";
 char c = s[0];   // A
 c = s[2];        // C (3rd char)
 c = s[4];        // E

Using a negative value for the index will result in an IndexOutOfRangeException being thrown.

Note that indexers work to extract Unicode characters only if they are 2-byte UTF16 characters.  The indexer cannot retrieve a 4-byte surrogate pair.

 string s = "A€C";
 char c = s[1];         // Works: €

 s = "A𠈓C";
 c = s[1];       // Doesn't work: unprintable character
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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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