C# Array initialization with a ternary operator? [closed] - c#

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They don't seem to work in C#
string[] directions =
IsSomeValueTrue ? string[]{"RIGHT", "LEFT"} : string[]{"UP", "DOWN"};
string[] directions =
IsSomeValueTrue ? new string[]{"RIGHT", "LEFT"} : new string[]{"UP", "DOWN"};
What am i missing?


The shortest one-liner:
var dirs = IsSomeValueTrue ? new[] {"RIGHT", "LEFT"} : new[] {"UP", "DOWN"};


Try this:
string[] directions = IsSomeValueTrue ? new string[] {"RIGHT", "LEFT"} : new string[]{"UP", "DOWN"};

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Search Array and get substring result [closed]

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I have a string array as follows:
string[] stringArray = { "1122|false", "1123|true", "1124|true", "1125|false" };
In essence, it is broken down by id|active where for example id is say 1122 and active is true or false.
Say my id was 1123, how would I search this array to get the value of true in this case? I understand Substring needs to be used with IndexOf but not sure how to tie it together.

Little bit of LINQ and String.Split should do the trick.
string[] stringArray = { "1122|false", "1123|true", "1124|true", "1125|false" };
int id = 1123;
var itemWithGivenId = stringArray
.SingleOrDefault(s => int.Parse(s.Split('|')[0]) == id);
Console.WriteLine(bool.Parse(itemWithGivenId.Split('|')[1]));

C# new string[2] vs new string[] [closed]

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Is there a difference between the following In terms of performance?
private static readonly string[][] a = { new string[] {"a", "b", "c"}};
private static readonly string[][] a = { new string[3] {"a", "b", "c"}};
Assuming I can write the 2 options (I know the values that will be in the array beforehand) which is better / more correct?

Both generates the same IL codes, so same performance, and both are correct.
The only advantage of the second option is when you need to restric the number of elements, it will give you a compile error if you put more or less elements.
// error
private static readonly string[][] a = { new string[3] {"a", "b"}};

C# switch case Array contains string [closed]

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Is it possible to look up if a string in contained in an Array, with a switch case?
string text = "blalbac";
string arr[] = {"a","b","c"};
switch (text)
{
case arr.Contains(filename):
//do..
break;
}

I’m not sure what you’re trying to do. Do you want something like
foreach(string item in arr)
{
if(text.Contains(item))
{
...
}
}

Concatenate elements of a list in c# [closed]

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I wanted to try some examples in C# using collections and generics but I am stuck at this example.
This is my code in c#,
public List<string> CurrentCount(int week, int year)
{
List<string> lst = new List<string>();
lst.Add("current:");
lst.Add("10");
lst.Add("target:");
lst.Add("15");
return lst;
}
It gives me result like this :
["current:","10","target:","15"]
But I want it like this :
["current": 10,"target": 15] or
["current": "10","target": "15"]
Any ideas will be helpful.
Thanks.

You want a Dictionary, not a List.
var dict = new Dictionary<string, int>();
dict.Add("current", 10);
dict.Add("target", 15);

Cannot apply indexing with [] to an expression of type? [closed]

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i have got this error
Error 3 Cannot apply indexing with [] to an expression of type
my problem here
if (client["banhours"] == 0)
{
client["banhours"] = -1;
client["banreason"] = "Infinite time.";
client["banstamp"] = DateTime.Now.AddYears(100);
}
if (Account.State == Database.AccountTable.AccountState.Banned)
{
if (client["banhours"] != -1)
{
DateTime banStamp = client["banstamp"];
if (DateTime.Now > banStamp.AddDays(((int)client["banhours"]) / 24).AddHours(((int)client["banhours"]) % 24))
Account.State = Database.AccountTable.AccountState.Player;
}
}
client is >>>
Client.GameClient client;

Have you tried client.banhours or client.banreason?
If Client.GameClient is a class and those are properties or fields, they must not be accessed like an array or dictionary.

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