Explanation of if statement

Question

I am new in C#. looks like below code is in C. Could some please explain below if statement

if ((!csentry.get_Item("UR.Action").get_IsPresent() ? false : csentry.get_Item("UR.Action").get_Value() == "Disable"))

Possible duplicate of [How does the ternary operator work?](https://stackoverflow.com/questions/463155/how-does-the-ternary-operator-work) — ProgrammingLlama, Apr 02 '19 at 04:17
It's code that's been compiled and then decompiled back to C# without access to referenced assemblies. This often happens in ILSpy; when you add the referenced assemblies and the types become available, the property metadata allows it to translate to property accesses. — madreflection, Apr 02 '19 at 04:18

TheGeneral · Answer 1 · 2019-04-02T04:45:08.477

5

It breaks down to the following. Which is 1000 times more readable than what you had

var urlAction = csentry["UR.Action"];

if (urlAction.IsPresent && urlAction.Value == "Disable")
{
     // then do stuff
}

_{Note : see @madreflection's comments on the post for an understanding of why this maybe mangled so badly}

_{it's code that's been compiled and then decompiled back to C# without
access to referenced assemblies. This often happens in ILSpy; when you
add the referenced assemblies and the types become available, the
property metadata allows it to translate to property accesses}

Additional Resources

?: Operator (C# Reference)

The conditional operator ?:, commonly known as the ternary conditional operator, evaluates a Boolean expression, and returns the result of evaluating one of two expressions, depending on whether the Boolean expression evaluates to true or false

edited Apr 02 '19 at 04:45

answered Apr 02 '19 at 04:23

TheGeneral

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I was just thinking about this. – ChaosPandion Apr 02 '19 at 04:25
1

The decompiled code lacks property metadata. See my edit. – madreflection Apr 02 '19 at 04:25
@RajatKansal im listening... intently – TheGeneral Apr 02 '19 at 04:28
1

@RajatKansal If you think this is wrong I get the feeling you probably don't know how the ternary operator works. This is functionally the same as OP's code. Although in the future I recommend explaining why you think something is wrong, just saying it's wrong isn't helpful. – Spencer Wieczorek Apr 02 '19 at 04:39
Hi oksometimes we may get confuse – Rajat Kansal Apr 02 '19 at 04:42

score 0 · Answer 2 · edited Apr 02 '19 at 06:20

An if statement basically says if a condition is met, do this. In this instance, it is saying:

IF !csentry.get_Item("UR.Action").get_IsPresent() ? false : csentry.get_Item("UR.Action").get_Value() is equal to "Disable", do a result that isn't included.

Really more info is needed to give you the exact answer. But once you realize how they work, if statements are simple. The basic format is:

if (condition) {
   result
}

Say I had to do a simple response program for a someone saying "hi"

if (input == 'hi') {
   printf("hello");
}

score 0 · Answer 3 · answered Apr 02 '19 at 04:24

Here as for If it's evaluating a ternary operation.

From a very high level, it looks like !csentry.get_Item("UR.Action").get_IsPresent() if the UR.Action is present then the if condition will not executed. And if it not present then this condition get evaluated csentry.get_Item("UR.Action").get_Value() == "Disable" if that true then the if block get executed else it'll not get executed.

When you get time take a look at ternary_operator for more details

Explanation of if statement

3 Answers3