ASP.NET Core MVC Ajax not working properly

问题

My issue is very very simple but I have not found any solution about this issue in the entire internet. I am new at ASP.NET CORE MVC and I feel its AJAXs is very hard to understand compared to the normal ASP.NET.

Well I am trying to pass an array/list of objects to controller but I cant make this. It is Very simple but it does not work the way I want ( In the normal ASP.NET MVC worked great).

For example I have this:

var detalleVenta = new Array();

     $.each($("#tableventa tbody tr"), function () {

                 detalleVenta.push( 
                     {
                         "ProductoId" :  $(this).find("td").eq(6).html(),
                         "Cantidad" :  $(this).find("td").eq(2).html(),
                         "Precio" :  $(this).find("td").eq(3).html(),
                         "Total" :  $(this).find("td").eq(4).html() 
                     }
                     ); 
            });

        $.ajax({
          method:"POST",
          data: JSON.stringify(detalleVenta),
          "dataType": "json",
          "contentType": "application/json",
           url: '@Url.Action("GuardarVenta", "Venta")',
           traditional: true,         
           success: function(data, textStatus) { 
           if (data == "OK" ){
           location.href = '@Url.Action("Index","Compra")'          
        }
    }
        ,
        })

MVC controller:

public JsonResult GuardarVenta([FromBody]List<DetalleBinding> detalle)
{
      ...
}

public class DetalleBinding
{
    public string ProductoId {get; set;}
    public string Cantidad {get;set;}
    public string Precio {get;set;}
    public string Total {get;set;}
}

This way worked for me, ajax sends the list successfully data to controller:

But my issue is... what if I want to send more data appart from that data? I Normally write it in JSON format like this : data : { "detalle" : detalleVenta, "Name" : "Mary", "Age" : 34} but my issue is that this does not work for me.

I tried this:

 $.ajax({
    method:"POST",
    data: {"detalle" : JSON.stringify(detalleVenta)},
    "dataType": "json",
    "contentType": "application/json",
    url: '@Url.Action("GuardarVenta", "Venta")',
    traditional: true,         
    success: function(data, textStatus) { 
    if (data == "OK" ){
        location.href = '@Url.Action("Index","Compra")'          
        }
    }
        ,
        })

But it does not bind to controller and gives me null.

What I am doing wrong?

This is what console.log(JSON.stringify(detalleVenta)) shows:

回答1:

In Doc you can see:

Don't apply [FromBody] to more than one parameter per action method. Once the request stream is read by an input formatter, it's no longer available to be read again for binding other [FromBody] parameters.

So if you want to send more data ,the easiest way is through querystring,like below(change url):

$.ajax({
      method:"POST",
      data: JSON.stringify(detalleVenta),
      dataType: "json",
      contentType: "application/json",
      url: "Venta/GuardarVenta?age=34&name=Marry",
      traditional: true,         
      success: function(data, textStatus) { 
      if (data == "OK" ){
      location.href = '@Url.Action("Index","Compra")'          
    }

Action:

public JsonResult GuardarVenta([FromBody]List<DetalleBinding> detalle,int age,string name)
{
  ...
}

来源：https://stackoverflow.com/questions/65088046/asp-net-core-mvc-ajax-not-working-properly