Replace 0 in array with "null" word in array

Question

I have a List that is converted to a string for JSON parsing. I need to replace 0 values with the word "null" since the API that I'm using accepts it rather than leaving it blank it the list.

I tried string replace "0," with "null," however this will not work when the end of the list value is 0.

public List<double> Message { get; set; }

public string jsonMessage
    get {
        string test = "";
    if (this.Message!= null && this.Message.Count > 0)
    {
        test = String.Join(",", this.Message).Replace("0,","null,")
    }
    return test; 
}

Why dont you replace the values in the list before creating the string? — Aaron
– Aaron, Commented May 16, 2019 at 5:11
You don't need the message count check; string join returns an empty string if there are zero elements in your list — Caius Jard
– Caius Jard, Commented May 16, 2019 at 5:27

JLRishe · Accepted Answer · 2019-05-16 05:16:20Z

5

I believe this should accomplish what you're describing:

test = string.Join(",", Message.Select(n => n == 0 ? "null" : n.toString());

answered May 16, 2019 at 5:16

JLRishe

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SᴇM · Accepted Answer · 2019-05-16 05:16:10Z

2

I'm not sure why you have called that property jsonMessage, do you trying to construct json by hand or something? But anyway, you can simply do:

test = String.Join(",", this.Message.Select(s => s == 0 ? "null" : s.ToString()));

answered May 16, 2019 at 5:16

SᴇM

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