How to set array length in c# dynamically

by 
InputProperty[] ip = new InputProperty[nvPairs.Length];

Or, you can use a list like so:

List<InputProperty> list = new List<InputProperty>();
InputProperty ip = new (..);
list.Add(ip);
update.items = list.ToArray();

Another thing I’d like to point out, in C# you can delcare your int variable use in a for loop right inside the loop:

for(int i = 0; i<nvPairs.Length;i++
{
.
.
}

And just because I’m in the mood, here’s a cleaner way to do this method IMO:

private Update BuildMetaData(MetaData[] nvPairs)
{
        Update update = new Update();
        var ip = new List<InputProperty>();

        foreach(var nvPair in nvPairs)
        {
            if (nvPair == null) break;
            var inputProp = new InputProperty
            {
               Name = "udf:" + nvPair.Name,
               Val = nvPair.Value
            };
            ip.Add(inputProp);
        }
        update.Items = ip.ToArray();
        return update;
}

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