Question 87044 in ASP.NET Question posted in
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Can not get a value of key-value pair using [FromBody] – Asp.net

Data is sent from front-end to back-end. Request body is created like this

var stateWithValue = {};

for (const item in self.pricings()) {
    state[item] = self.pricings()[item]["Comment"];
}

var request = {
    generalComment: self.generalComment(),
    stateWithValue: stateWithValue
};

Request body looks like this

{
generalComment: "test comment",
stateWithValue:
{
  Delaware: "Value1",
  California: "Value2",
  Texas: "Value3"
}
}

Number of elements in stateWithValue can be different for every request.

In the back-end, data is taken using [FromBody] attribute

public WebApiResponseGeneric<EmptyResponse> State([FromBody] StateRequest request)

StateRequest.cs

public class StateRequest : PublicRequest
{
    public string GlobalComment { get; set; }
    public StateWithValue StateWithValue { get; set; }
}
public class StateWithValue
{
    public string State { get; set; }
    public string Value { get; set; }
}

In network tab(dev console) payload looks like this

generalComment: test general comment
stateWithValue[Delaware]: Value1
stateWithValue[California]: Value2
stateWithValue[Texas]: Value3

The Problem
In back-end request object, StateWithValue.State StateWithValue.Value are both null.

Tags:

2

Answers


  1. 0

    YOu have to post PublicRequest class too. But for your request body json, your class should be

    public class StateRequest : PublicRequest
{
    public string generalComment{ get; set; }
    public Dictionary<string, string> stateWithValue { get; set; }
}

    or change

    public class StateRequest : PublicRequest
{
    public string GlobalComment { get; set; }
    public List<StateWithValue> StateWithValue { get; set; }
}

    and javascript

    var stateWithValue = [];

for (const item in self.pricings()) {
    var stateWithValueItem={};
    stateWithValueItem.State =item;
    stateWithValueItem.Value = self.pricings()[item]["Comment"];
   
 stateWithValue.push(stateWithValueItem);
    
}
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  2. 0

    In order to map the JSON:

    {
generalComment: "test comment",
stateWithValue:
{
  Delaware: "Value1",
  California: "Value2",
  Texas: "Value3"
}
}

    You would need to use the following C# model

    public class StateRequest : PublicRequest
{
    public string GeneralComment { get; set; }
    public StateWithValue StateWithValue { get; set; }
}
public class StateWithValue
{
    public string Dalaware { get; set; }
    public string California { get; set; }
    public string Texas { get; set; }
}

    If you want to map multiple states then consider using an array instead, something like:

    {
generalComment: "test comment",
stateWithValue:
[
  State: "Delaware", Value: "Value1",
  State: "California", Value: "Value2",
  State: "Texas", Value: "Value3"
]
}

    But your model would need to be updated to look something like this:

    public class StateRequest : PublicRequest
{
    public string GeneralComment { get; set; }
    public List<StateWithValue> StatesWithValues { get; set; }
}

    Note: There is a typo with general vs Global in your sample code

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