Angular sending string list parameter by GET method

Question

I have an Angular 6 project. And I'm sending my request to .NET Core 2.1 Web API. I'm sending string fruit list like below. But, my data coming to C# has only one item like "'apple', 'orange', 'banana'" . But, I want three different strings. How can I achieve this? Please don't advice using "POST" method

Angular side

getFruitDetails() {
    let params = new HttpParams();
    params = params.append('fruitType', '35');
    params = params.append('fruits', JSON.stringify(['apple', 'orange', 'banana']));

    return this.http.get('https://localhost:5000/api/Fruit/GetFruitDetails', { params: params });
}

C# Side

public GetFruitDetails([FromQuery] FruitModel fruitModel)
{...}

public class FruitModel
{
    public int FruitType { get; set; }
    public List<string> Fruits { get; set; }
}

What is queryparams? When I googled, every results are HttpParams. @PardeepJain — realist
– realist, Commented Dec 18, 2018 at 12:08
Sending parameters using ? in url for example https://localhost:5000/api/Fruit/GetFruitDetails/?fruit1=apple&fruit2=banana... — Pardeep Jain
– Pardeep Jain, Commented Dec 18, 2018 at 12:10
Thanks a lot for reply @PardeepJain. I don't want concatting strings. So, I'm using HttpParams. MarcusHöglund' s solution is what I was looking for. — realist
– realist, Commented Dec 18, 2018 at 12:14

Marcus Höglund · Accepted Answer · 2018-12-18 12:07:17Z

4

The FromQuery attribute will add all query params that matching fruits=value from the querystring into the list Fruits.

Therefore, compose the params as

getFruitDetails() {
    let params = new HttpParams();
    params = params.append('fruitType', '35');
    params = params.append('fruits', 'apple');
    params = params.append('fruits', 'orange');
    params = params.append('fruits', 'banana');

    return this.http.get('https://localhost:5000/api/Fruit/GetFruitDetails', { params: params });
}

answered Dec 18, 2018 at 12:07

Marcus Höglund

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5 Comments

realist Over a year ago

Thanks a lot @MarcusHöglund . It worked. But, Is it common way or tricky way?

Marcus Höglund Over a year ago

@HasanOzdemir its how the FromQuery attribute work. Its the standard way :)

Marcus Höglund Over a year ago

@D-johnAnshani why should he do that? the FromQuery attribute solves this in an elegant way. Why bring more complexity to it by manually checking it

realist Over a year ago

I think your way is not correct way @D-johnAnshani . Because, strings can have comma. And then that way gave wrong result.

Jcl Over a year ago

You don't need to pass them one by one with params.append, you can add the array... just don't JSON.Stringify() it

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