C#•14mo ago

❔ Adding list in single line

In C++, I could add a list in a single line using a vector. For example:

std::vector<std::string> months = { "January", "February", "March" };

// another thing I could do:
setMonths({ "January", "February", "March" });

std::vector<std::string> months = { "January", "February", "March" };

// another thing I could do:
setMonths({ "January", "February", "March" });

Is there a similar way with C# and lists? That way I'm not calling "Add" 12 times, but keeping them like an array on initialization. With C#, I think it's just

List<string> months = new List<string>();
months.Add("January");
months.Add("February");
months.Add("March");

List<string> months = new List<string>();
months.Add("January");
months.Add("February");
months.Add("March");

Or AddRange(): -- Which isn't too bad, but still feels bigger than it should be.

        List<string> vMonths = new List<string>();
        string[] months = new string[] { "January", "February", "March" };
        vMonths.AddRange(months);
        dt.SetMonths(vMonths);

        List<string> vMonths = new List<string>();
        string[] months = new string[] { "January", "February", "March" };
        vMonths.AddRange(months);
        dt.SetMonths(vMonths);

Ideal:

dt.SetMonths({ "January", "February", "March" });  // Param: SetMonths(List<string> list)

dt.SetMonths({ "January", "February", "March" });  // Param: SetMonths(List<string> list)

18 Replies

ero•14mo ago

collection initializer;

List<string> months = new { "January", "February", "March" };

List<string> months = new { "January", "February", "March" };

chef drone builder•14mo ago

You could create an extension method with a params array. I think he ment add not initialize

triplemocha•14mo ago

I get CS0746 with the strings.

ero•14mo ago

Yeah i know every C# error off the top of my head

triplemocha•14mo ago

That's good.

ero•14mo ago

It was a joke

triplemocha•14mo ago

Most just Google CS#.

ero•14mo ago

The burden of detail is not on me lol It's your problem

MODiX•14mo ago

Ero#1111

REPL Result: Failure

List<string> months = new { "January", "February", "March" };

List<string> months = new { "January", "February", "March" };

Exception: CompilationErrorException

- Invalid anonymous type member declarator. Anonymous type members must be declared with a member assignment, simple name or member access.
- Invalid anonymous type member declarator. Anonymous type members must be declared with a member assignment, simple name or member access.
- Invalid anonymous type member declarator. Anonymous type members must be declared with a member assignment, simple name or member access.

- Invalid anonymous type member declarator. Anonymous type members must be declared with a member assignment, simple name or member access.
- Invalid anonymous type member declarator. Anonymous type members must be declared with a member assignment, simple name or member access.
- Invalid anonymous type member declarator. Anonymous type members must be declared with a member assignment, simple name or member access.

Compile: 493.222ms | Execution: 0.000ms | React with ❌ to remove this embed.

ero•14mo ago

Oh whoops That is my bad indeed new() But you could have just guessed that yourself

triplemocha•14mo ago

Okay, that worked. Not really. dt.SetMonths(new() { "January", "February", "March" }); I was able to reduce it to this line with my set method.

ero•14mo ago

Sure So it did work

triplemocha•14mo ago

Yes. Thanks.

chef drone builder•14mo ago

something like this would also work:

dt.SetMonths("January", "February");
public void SetMonths(params string[] months)

dt.SetMonths("January", "February");
public void SetMonths(params string[] months)

boiled goose•14mo ago

i don't know if i'm losing some context but there is List.AddRange([stuff])

Unknown User•14mo ago

Message Not Public

triplemocha•14mo ago

All good suggestions. Thanks. The params one seems fluid for a user-created class method.

Accord•14mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Adding list in single line