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Editorial Team
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Asked: 2026-05-12T10:08:01+00:00

my query is simple, as I do, if possible, the following in C #.

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my query is simple, as I do, if possible, the following in C #. 

<html>
<head>
<script src="../jquery-1.3.2.js" type="text/javascript"></script>
<script type="text/javascript">
    $(function(){
        $("#datos").append("<span style=\"font-weight:bold\">(false || null || \"1º\" || \"2º\")</span> : <span>"+(false || null || "1º" || "2º")+"</span><br />");
        $("#datos").append("<span style=\"font-weight:bold\">(false && null || false || \"2º\")</span> : <span>"+(false && null || false || "2º")+"</span><br />");
        $("#datos").append("<span style=\"font-weight:bold\">(false && true || \"1º\" || \"2º\")</span> : <span>"+(false && true || "1º" || "2º")+"</span><br />");
        $("#datos").append("<span style=\"font-weight:bold\">(true && null && 6 && 5)</span> : <span>"+(true && null && 6 && 5)+"</span><br />");
        $("#datos").append("<span style=\"font-weight:bold\">(null && true && false && false)</span> : <span>"+(null && true && false && false)+"</span><br />");
        $("#datos").append("<span style=\"font-weight:bold\">(false && true && false && false)</span> : <span>"+(false && true && false && false)+"</span><br />");
        $("#datos").append("<span style=\"font-weight:bold\">(true && 1 && true && 2)</span> : <span>"+(true && 1 && true && 2)+"</span><br />");
        $("#datos").append("<span style=\"font-weight:bold\">(true && \"1º\" && true && \"2º\")</span> : <span>"+(true && "1º" && true && "2º")+"</span><br />");
        $("#datos").append("<span style=\"font-weight:bold\">(true && true && \"1º\" && \"2º\")</span> : <span>"+(true && true && "1º" && "2º")+"</span><br />");
    });
</script>
</head>
<body>
<div id="datos"></div>
</body>
</html>

Return to HTML:

(false || null || "1º" || "2º") : 1º
(false && null || false || "2º") : 2º
(false && true || "1º" || "2º") : 1º
(true && null && 6 && 5) : null
(null && true && false && false) : null
(false && true && false && false) : false
(true && 1 && true && 2) : 2
(true && "1º" && true && "2º") : 2º
(true && true && "1º" && "2º") : 2º

Thank you.

— EDIT for Comments

I need to accomplish the following in C#:

string value1 = string.Empty;
string value2 = "default value";

// Request.Form["valueA"] and Request.Form["valueB"] may be null
value1 = (Request.Form["valueA"] || Request.Form["valueB"] || value2);
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1 Answer

  1. Editorial Team

    Those expressions are invalid in C# because the .NET || and && operators are strongly typed.

    There is, however, the x ?? y operator which returns y if x is null and x otherwise:

    string value1;
string value2 = "default value";

value1 = Request.Form["valueA"] ?? Request.Form["valueB"] ?? value2;
                                ^                         ^
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