How to call web api using C#

Question

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i am calling ExpertTexting Api for sending SMS but my get Method is working fine when i try to send message using post its show invalid paramenter. below is my post method

private static string BaseUrl = "https://www.experttexting.com/ExptRestApi/sms/json//Message/Send";
var data = "?username=" + username + "&password=" + password + "&api_key=" + apikey + "&from=" + from + "&to=" + to + "&text=" + text + "&type=text";

using (var client = new HttpClient())
{
var serializedProduct = JsonConvert.SerializeObject(data);
var content = new StringContent(serializedProduct, Encoding.UTF8, "application/json");
response = await client.PostAsJsonAsync(BaseUrl, content);
}

What I have tried:

private static string BaseUrl = "https://www.experttexting.com/ExptRestApi/sms/json//Message/Send";
var data = "?username=" + username + "&password=" + password + "&api_key=" + apikey + "&from=" + from + "&to=" + to + "&text=" + text + "&type=text";

using (var client = new HttpClient())
{
var serializedProduct = JsonConvert.SerializeObject(data);
var content = new StringContent(serializedProduct, Encoding.UTF8, "application/json");
response = await client.PostAsJsonAsync(BaseUrl, content);
}

Posted 24-Jan-17 7:56am

awaisshabir

Updated 24-Jan-17 10:49am

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Comments

Afzaal Ahmad Zeeshan 24-Jan-17 14:51pm

Then kindly check what kind or parameters are they expecting?

Richard MacCutchan 24-Jan-17 14:52pm

Looks like you are sending an invalid parameter.

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Richard Deeming · Answer 1 · 2017-01-24T10:49:00

You're mixing up multiple ways of sending data:

The data string contains application/x-www-form-urlencoded data:
plain
```
?username=...&type=text
```
You then call JsonConvert.SerializeObject to convert that string to JSON:
plain
```
"?username=...&type=text"
```
You then call PostAsJsonAsync, which will JSON-encode the data again:
plain
```
"\"?username=...&type=text\""
```

You'll need to check with the API documentation to see how you are supposed to be passing the data. At a guess, it should look something like this:

C#

using (var client = new HttpClient())
{
    response = await client.PostAsJsonAsync(BaseUrl, new
    {
        username,
        password,
        api_key = apikey,
        from,
        to,
        text,
        type = "text"
    });
}