❔ How to convert query string to an Enum in a custom way

I have the following code: .

[HttpGet]
public async Task<IActionResult> GetCarsAsync([FromQuery] GetCarsApiQuery query) 
{

}

public class GetCarsApiQuery
{
    public string? VehicleId { get; set; }


    public VehicleType? VehicleType { get; set; } //Cannot change its type to string
}

public enum VehicleType {
    Car, 
    Bike,
    Undefined
}

[HttpGet]
public async Task<IActionResult> GetCarsAsync([FromQuery] GetCarsApiQuery query) 
{

}

public class GetCarsApiQuery
{
    public string? VehicleId { get; set; }


    public VehicleType? VehicleType { get; set; } //Cannot change its type to string
}

public enum VehicleType {
    Car, 
    Bike,
    Undefined
}

By default, If I send a GET request with a VehicleType = Foo, the framework will return a bad request. I want to change this behavior so that when it tries to convert the query string to VehicleType, it either succeed or returns VehicleType.Undefined
In other words, I am looking for something like a custom JsonConverter but that works on query strings rather than json body
any ideas ?

C#•3y ago•

69 replies

Amira

❔ How to convert query string to an Enum in a custom way

I have the following code: .

[HttpGet]
public async Task<IActionResult> GetCarsAsync([FromQuery] GetCarsApiQuery query) 
{

}

public class GetCarsApiQuery
{
    public string? VehicleId { get; set; }


    public VehicleType? VehicleType { get; set; } //Cannot change its type to string
}

public enum VehicleType {
    Car, 
    Bike,
    Undefined
}

[HttpGet]
public async Task<IActionResult> GetCarsAsync([FromQuery] GetCarsApiQuery query) 
{

}

public class GetCarsApiQuery
{
    public string? VehicleId { get; set; }


    public VehicleType? VehicleType { get; set; } //Cannot change its type to string
}

public enum VehicleType {
    Car, 
    Bike,
    Undefined
}

❔ How to convert query string to an Enum in a custom way

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