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

User · Answer

You can achieve this with pattern matching with the switch expression in C 8 9 FooTextBox Text   strFoo switch         Length   gt 0   s   gt  s     If the length of the string is greater than 0          gt   quot 0 quot     Anything else

User · Answer

You could use the ternary operator   return string IsNullOrEmpty strTestString     0    strTestString  FooTextBox Text   string IsNullOrEmpty strFoo     0    strFoo

User · Answer

This may help    public string NonBlankValueOf string strTestString        return String IsNullOrEmpty strTestString    0   strTestString

User · Answer

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     quot 0 quot    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     quot 0 quot    someString

User · Answer

Old question  but thought I d add this to help out    if DOTNET35 bool isTrulyEmpty   String IsNullOrEmpty s     s Trim   Length    0   else bool isTrulyEmpty   String IsNullOrWhiteSpace s     endif

User · Answer

You can write your own Extension method for type String  -   public static string NonBlankValueOf this string source         return  string IsNullOrEmpty source      0    source       Now you can use it like with any string type  FooTextBox Text   strFoo NonBlankValueOf

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

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