22. April 2011
Asp.Net , C#
There is a smarter way of avoiding null values in string assignment. Many of us use ternary operator, Format etc. to handle null value like below-
- string studentHobbies = (txtHobbies.Text != null) ? txtHobbies.Text : string.Empty;
The same statement can be written using null-coalescing operator (??) in following manner -
- string studentHobbies = txtHobbies.Text ?? string.Empty;
The above statement is the same as the preceding example statement.?? evaluates the first operand against null and -
- If txtHobbies is null then right operand is returned
- If txtHobbies is not null then left operand is returned
Below are the important points regarding Null-coalescing-
- Null coalescing operator can be used with Reference types and nullable types.
- Null coalescing is a binary operator which is used for conditional assignment by checking the null.
- Null coalescing is a right associative operator like assignment and other conditional operators. So, its priorities the evaluation from right to left.