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What is the best way for checking empty strings (I'm not asking about initializing!) in C# when considering code performance?(see code below)
string a; // some code here....... if(a == string.Empty) or
if(string.IsNullOrEmpty(a)) or
if(a == "") any help would be appreciated. :)
393
To check if a given string is empty or not, we can use the strlen() function in C. The strlen() function takes the string as an argument and returns the total number of characters in a given string, so if that function returns 0 then the given string is empty else it is not empty.
Answer: Use the === Operator You can use the strict equality operator ( === ) to check whether a string is empty or not.
Use the length property to check if a string is empty, e.g. if (str. length === 0) {} . If the string's length is equal to 0 , then it's empty, otherwise it isn't empty. Copied!
Using the isEmpty() Method The isEmpty() method returns true or false depending on whether or not our string contains any text. It's easily chainable with a string == null check, and can even differentiate between blank and empty strings: String string = "Hello there"; if (string == null || string.
Do not compare strings to String.Empty or "" to check for empty strings.
Instead, compare by using String.Length == 0
The difference between string.Empty and "" is very small. String.Empty will not create any object while "" will create a new object in the memory for the checking. Hence string.empty is better in memory management. But the comparison with string.Length == 0 will be even faster and the better way to check for the empty string.
139
I think the best way is if(string.IsNullOrEmpty(a)) because it's faster and safer than the other methods.
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