Assign Value In Base Controller From Post Request In ASP.Net core web API

Question

I have many controllers which are dependent on one variable which is let's say projectId.

So on every request of all methods I have to parse projectId as below. so is it possible to get this value in base controller variable and use it directly for all methods. I found some actionexecuting and initialize way, but they were examples in .net, I could not manage to get in asp.net core web API.

public void Save([FromBody]JObject data)
        {
            new SaveMethod((int)data["projectId"])
                .Save((string)data["otherData"]);
        }

Any reason you aren't using model binding to get a strongly-typed input parameter? — Nate Barbettini
– Nate Barbettini, Commented Sep 17, 2019 at 23:47

Nan Yu · Accepted Answer · 2019-09-18 06:10:07Z

2

You can simply use the default model binding , create a class and application will automatically bind to object after getting the post request :

[HttpPost]
public void Post([FromBody] MyValue value)
{
}

public class MyValue {
    public int projectID { get; set; }

    //Other property 
}

And the request will be something like :

POST https://localhost:XXXX/api/values
Content-Type: application/json

{"projectID": 1}

Then you can save to session for later access if you want the data available across requests.

Or you can just not use model binding(remove [FromBody] parameter , model binding execute before filter) , and get the request body in OnActionExecuting and save to session for later access :

public class MyControllerBase: Controller
{
    public override void OnActionExecuting(ActionExecutingContext context)
    {
        base.OnActionExecuting(context);


        var bodyStr = "";
        var req = context.HttpContext.Request;

        // Allows using several time the stream in ASP.Net Core
        req.EnableRewind();

        // Arguments: Stream, Encoding, detect encoding, buffer size 
        // AND, the most important: keep stream opened
        using (StreamReader reader
                = new StreamReader(req.Body, Encoding.UTF8, true, 1024, true))
        {
            bodyStr = reader.ReadToEnd();
        }

        // Rewind, so the core is not lost when it looks the body for the request
        req.Body.Position = 0;

    }

}

And you can make your controller inherits MyControllerBase and modify that to meet your requirement .

edited Sep 18, 2019 at 6:10

answered Sep 18, 2019 at 5:46

Nan Yu

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3 Comments

Anonymous Creator Over a year ago

I am using .net core web api. in this onactionexecuting is not working. it gives error as "no suitable method found to override".

Anonymous Creator Over a year ago

using model binding, I will have to create lot of models. per method.

Anonymous Creator Over a year ago

ok got it. I was inheriting controllerbase instead of controller. thats why onactionexecuting was not working.

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