out in **out string [][] teams** 是什么意思

Question

what does out mean in a multidimensional param, if it's possible write an eg please, I'll really appreciate

public string GetTeamsInfo(out string[][] teams)
{
    ...
}

Answer 1

out means the parameter is an {out}put parameter

opposed to the default input parameter (note: an input parameter is not the same as a parameter using the in modifier, that is an input only parameter and imposes it own requirements)

this means it has no value at the beginning of the function and you need to assign one for it to be passed back to the calling code

see https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/out-parameter-modifier

public string GetTeamsInfo(out string[][] teams)
{
    teams = new string[3][4];
    return "test";
}

string[][] teams;
//here teams is null
string text = GetTeamsInfo(out teams);
//here teams is a array of string[]