Http Post Method Passing Null Values to the Server

http post method passing null values to the server

you should try below code its running very well for me.

   // ADD YOUR REQUEST DATA HERE  (you can pass number of variable).
    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
    nameValuePairs.add(new BasicNameValuePair("Your_var_1", value));
    nameValuePairs.add(new BasicNameValuePair("Your_var_2", value));

Now establish your web connection like

(1) Sending simple string to server

    try
    {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("your url only ex:www.google.com/abc");
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        HttpParams httpParameters = new BasicHttpParams();
        DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters);
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        is = entity.getContent();
    } catch (Exception e) 
    {   
        Log.e("Loading Runnable Error in http connection  :", e.toString());
    }

(2) Send JSON Encode string to server

HttpClient client = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(client.getParams(), 10000); //Timeout Limit
HttpResponse response;
JSONObject json = new JSONObject();

try {
HttpPost post = new HttpPost(URL);
json.put("user_name", "chintan");
json.put("password", "khetiya");
StringEntity se = new StringEntity( json.toString());  
se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
post.setEntity(se);
response = client.execute(post);

 /*Checking response */
if(response!=null){
is = response.getEntity().getContent(); //Get the data in the entity
 }

} catch(Exception e) {
e.printStackTrace();
createDialog("Error", "Cannot Estabilish Connection");
}

Response will same in both case

try 
    {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) 
        {
            sb.append(line + "\n");
        }
        is.close();
        result = sb.toString();
    }
    catch (Exception e) 
    {   
        Log.e("Loading Runnable Error converting result :", e.toString());
    }

Now at the end result contain whole output string now its depend on you how you will read your data. using json or else. i am doing using json so put example code of it may be helpful to you.

JSONObject json_data = new JSONObject(result);// its a string var which contain output. 
        my_output_one = json_data.getString("var_1"); // its your response var form web.
        my_output_two = json_data.getString("var_2");

Now its over you have two variable which having any kind of value and use any were.

Now this will helpful to you. if you have any query let me know.

Null value when Pass values [FromBody] to post method by Postman plugin

You can't bind a single primitive string using json and FromBody, json will transmit an object and the controller will expect an complex object (model) in turn. If you want to only send a single string then use url encoding.

On your header set

Content-Type: application/x-www-form-urlencoded

The body of the POST request message body should be =saeed (based on your test value) and nothing else. For unknown/variable strings you have to URL encode the value so that way you do not accidentally escape with an input character.

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Alternate 1

Create a model and use that instead.

Message body value: {"name":"saeee"}

c#

public class CustomModel {
    public string Name {get;set;}
}

Controller Method

public HttpResponseMessage Post([FromBody]CustomModel model)

Alternate 2

Pass primitive strings to your post using the URI instead of the message body.

Passing Null as a Parameter to Controller POST Method

You can use an action filter to intercept the bad request.

See the question, Validating parameters in ASP.NET Web API model binder

Values null when I make a simple post request to my .net controller from angular

At your angular side update your method like this

    updateMessage(message: any) {
    console.log("at service")
    console.log(message)
    var newMessage = new CorpNotes(message['departments'], message['noteBody'], message['weeks'].weekEnding)
    var Params = '?Department=' + message['departments'] + '&Note=' + message['noteBody'] + '&WeekEnding=' + message['weeks'].weekEnding
    console.log(newMessage)
    console.log(JSON.stringify(newMessage))
    console.log(Params)

   var item = {
    "Departments": message["Departments"],
    "Note": message["noteBody"],
    "WeekEnding": message["weeks"]
   }

    return this.http.post(this.baseUrl + 'api/SlgCorpNotes/Edit', item).subscribe(res 
      => {
       console.log(res);
    }, error => {
         console.log(error);
    });
  }

Post parameter is always null

Since you have only one parameter, you could try decorating it with the [FromBody] attribute, or change the method to accept a DTO with value as a property, as I suggested here: MVC4 RC WebApi parameter binding

UPDATE: The official ASP.NET site was updated today with an excellent explanation: https://learn.microsoft.com/en-us/aspnet/web-api/overview/advanced/sending-html-form-data-part-1

In a nutshell, when sending a single simple type in the body, send just the value prefixed with an equal sign (=), e.g. body:

=test

Pass null value to ASP.NET web service using HTTP POST?

Neither of these can have null values. They are both value types and can't be set to null even if you attempted to do it using code. I would recommend sending DateTime.MinValue and 0.

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