String.empty v.s. string.null

George2
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String.empty v.s. string.null

Hello everyone,
I am doing input parameter checking for a string type, and string value except empty is valid. My function is provided to outer client to call. Sometimes I find to check null is not enough, I also need to check String.Empty.
My question is, what are the differences between null and String.Empty? I have made some web search for the answers but not very useful information.
thanks in advance,
George

csharpfriends

asked 2 years ago

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last answered 2 years ago

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When a string variable is set to null, this means that it doesn't currently refer to a string instance.
An empty string is a string instance which contains no characters. In other words its Length property is 0.

answered 2 years ago by:

vulpes
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Just as a tip, there is also a handly method that I just personally started using in my code:
String.IsNullOrEmpty();
Before using this handly method I was always doing things like:
if(null != id && 0 != id.length)
{
}
Now I can just do:
if(!String.IsNullOrEmpty(id))
{
}