c# - One liner for If string is not null or empty else

Question

I usually use something like this for various reasons throughout an application:

if (String.IsNullOrEmpty(strFoo))
{
     FooTextBox.Text = "0";
}
else
{
     FooTextBox.Text = strFoo;
}

If I'm going to be using it a lot I will create a method that returns the desired string. For example:

public string NonBlankValueOf(string strTestString)
{
    if (String.IsNullOrEmpty(strTestString))
        return "0";
    else
        return strTestString;
}

and use it like:

FooTextBox.Text = NonBlankValueOf(strFoo);

I always wondered if there was something that was part of C# that would do this for me. Something that could be called like:

FooTextBox.Text = String.IsNullOrEmpty(strFoo,"0")

the second parameter being the returned value if String.IsNullOrEmpty(strFoo) == true

If not does anyone have any better approaches they use?

Answer 1

There is a null coalescing operator (??), but it would not handle empty strings.

If you were only interested in dealing with null strings, you would use it like

string output = somePossiblyNullString ?? "0";

For your need specifically, there is the conditional operator bool expr ? true_value : false_value that you can use to simplify if/else statement blocks that set or return a value.

string output = string.IsNullOrEmpty(someString) ? "0" : someString;