I have query parameters such as /api/items?sizes=m,l,xxl, meaning they are separated by commas. I want to accept them as array of strings ([FromQuery] string[] sizes).
How do I do that? I know how to split the string, the issue is how do I accept string[] and let make sure it knows how to split the string?
string[] sizes = request.Sizes.Split(",", StringSplitOptions.RemoveEmptyEntries);
Such transformation is not supported even for MVC binders (it will require query string in one of the following formats: ?sizes[0]=3344&sizes[1]=2222 or ?sizes=24041&sizes=24117).
You can try using custom binding:
public class ArrayParser
{
public string[] Value { get; init; }
public static bool TryParse(string? value, out ArrayParser result)
{
result = new()
{
Value = value?.Split(',', StringSplitOptions.RemoveEmptyEntries) ?? Array.Empty<string>()
};
return true;
}
}
And usage:
app.MapGet("/api/query-arr", (ArrayParser sizes) => sizes.Value);
app.MapGet("/api/query-arr", ([FromQuery] ArrayParser? sizes) => sizes?.Value); for optional query parameter?{ "value": [ "string" ] }, like it is not an input field that I can input item1,item2
FromQuery is not needed, removing it fixes the swagger.Try using %2c in the URL to replace the commas.
[FromQuery] string[] sizes
?values=this&values=thatis not a solution to my use case.