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How can i escape a string before sending in the body of a Rest request?

I have a rest request. The body is like the following:
RestClient client = new RestClient(uri);
RestRequest request = new RestRequest("", Method.POST);
request.AddHeader("Authorization", $"Bearer {myToken}");
request.AddHeader("Content-type", "application/json");
string json = "{'body': {'contentType': 'html','content': '" + message + "'}}";
request.AddJsonBody(json);
IRestResponse response = client.Execute(request);
The message contains apostrophes, like John's so the json will be
string json = "{'body': {'contentType': 'html','content': 'John's'}}";
This gives an error, Bad Request.
How can i accommodate for this and any other special characters in the message

you have to replace ' with \ "
string json= "{\"body\": {\"contentType\": \"html\",\"content\": \""+message+"\"}}";

Not able to add parameters to make GET request with C# RestSharp client

This is my first time working with APIs and I'd really appreciate your help and patience on bearing with me.
I'm making a GET request to the client Synccentric for getting data [Given URL below I'm using for ref].
https://api.synccentric.com/?version=latest#cb8d3255-7639-435e-9d17-c9e962c24146
[Update]
I found a way to attach parameters to querystrings and the response was validated. I'm still stuck with passing the array of fields.
var client = new RestClient("https://v3.synccentric.com/api/v3/products");
var request = new RestRequest(Method.GET);
Console.WriteLine("**** Adding Headers, Content Type & Auth Key ****");
request.AddHeader("Content-Type", "application/json");
request.AddHeader("Authorization", "Bearer {{MyAPIToken}}");
request.AddParameter("campaign_id", 12618);
request.AddParameter("downloadable", 1);
request.AddParameter("downloadable_type", "csv");
string[] fields = new[] { "asin", "upc", "actor", "all_categories", "is_eligible_for_prime", "listing_url" };
request.AddParameter("fields", fields);
IRestResponse response = client.Execute(request);
I think I know where the problem is
So the [5]th parameter should ideally hold this value "[\n \"asin\",\n \"upc\",\n \"additional_image_1\",\n \"category\",\n \"is_eligible_for_prime\",\n \"listing_url\"\n ]"
But instead it looks like this.
Can you guys help me with this?
I tried the API call using Python and referencing the documents and I did get the desired response.
Attaching the python block below:
import requests
url = 'https://v3.synccentric.com/api/v3/products'
payload = "{\n \"campaign_id\": 12618,\n \"fields\": [\n \"asin\",\n \"upc\",\n \"additional_image_1\",\n \"category\",\n \"is_eligible_for_prime\",\n \"listing_url\"\n ]\n} #\"downloadable\":1,\n \"downloadable_type\":\"csv\"\n}"
headers = {
'Content-Type': 'application/json',
'Authorization': 'Bearer {{MyAPIToken}}'
}
response = requests.request('GET', url, headers = headers, data = payload, timeout= 100000 , allow_redirects= 0)
print(response.text)
After the execution I got the response I was looking for.

RestSharp will not allow you to send a GET request with a content-body. The error says it all.
You will have to send the parameters as query parameters.
Console.WriteLine("**** Starting Synccentric API Fetch ****");
var client = new RestClient("https://v3.synccentric.com/api/v3/products");
var request = new RestRequest(Method.GET);
Console.WriteLine("**** Adding Headers, Content Type & Auth Key ****");
request.AddHeader("Content-Type", "application/json");
request.AddHeader("Authorization", "Bearer {{MyAPIToken}}");
Console.WriteLine("**** Adding parameters ****");
request.AddParameter("campaign_id", 12618);
request.AddParameter("downloadable", "true");
request.AddParameter("downloadable_type", "CSV");
var fields = new[] { "asin", "upc", "actor", "all_categories" };
foreach (var field in fields)
{
request.AddParameter("fields", field);
}
IRestResponse response = client.Execute(request);
This will build you the following query string, which should be sent and hopefully understood okay.
https://v3.synccentric.com/api/v3/products?campaign_id=12618&downloadable=True&downloadable_type=CSV&fields=asin&fields=upc&fields=actor&fields=all_categories
UPDATE Having looked at the comments, it may be that RestSharp cannot be used with that API as it seems that it requires content body with a GET request!

Trouble including a file in multipart/form-data POST using RestSharp

I'm relatively new to web interactions with C# and I'm having some trouble making a POST request to upload a file using an API. The API only accepts the files as part of a multipart/form-data section in the body. At other's suggestions I've been trying to use RestSharp to do this, but I can't seem to get the file itself into the POST. Chunks of code derived from Postman suggested code - where the POST works.
I've tried a few things. This chunk resulted in a POST going through with the correct parameter in the body, but no file was included.
var client = new RestClient(postURL);
var request = new RestRequest(Method.POST);
request.AddHeader("cache-control", "no-cache");
request.AddHeader("Content-Type", "application/x-www-form-urlencoded");
request.AddHeader("content-type", "multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW");
request.AddParameter("multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW", string.Format("------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"upfile\"; filename=\"{0}\"\r\nContent-Type: application/xml\r\n\r\n\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"overwrite\"\r\n\r\ntrue\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW--", xmlPath), ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
string test = response.Content.ToString();
I also tried some variations of AddFile - physical file path, byte array, and byte array with content type = application/xml. With these iterations, I was able to get a file to post, but the overwrite parameter wasn't coming through correctly to force a file overwrite.
var client = new RestClient(postURL);
var request = new RestRequest(Method.POST);
request.AddHeader("cache-control", "no-cache");
request.AddHeader("Content-Type", "application/x-www-form-urlencoded");
request.AddHeader("content-type", "multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW");
// The different part below
request.AddFile("upfile", #xmlPath);
request.AddParameter("multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW", "------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"overwrite\"\r\n\r\ntrue\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW--", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
string test = response.Content.ToString();
*note: I'm using an older version of RestSharp (105.2.3) to be compatible with .Net 4.0 (stuck with it in this case).
Any ideas as to what I'm doing wrong here?

Figured it out after sleeping on it, was really simple in the end. All of the extra webkit and multipart stuff that was throwing me for a loop is entirely unnecessary - autogenerated code from Postman is overly complicated it seems.
var client = new RestClient(postURL);
var request = new RestRequest(Method.POST);
request.AddHeader("cache-control", "no-cache");
request.AddHeader("Content-Type", "application/x-www-form-urlencoded");
request.AddHeader("content-type", "multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW");
request.AddFile("upfile", #xmlPath);
request.AddParameter("overwrite", "true", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
string test = response.Content.ToString();

BadRequest when PUT JSON data on Firebase REST API

I have this code that I am using to PUT my JSON string on Firebase database:
RestRequest request = new RestRequest("MemberAndChannels/{userId}/{channelId}.json", Method.POST);
request.RequestFormat = DataFormat.Json;
request.AddParameter("auth", accessKey);
request.AddUrlSegment("userId", user.UUID);
request.AddUrlSegment("channelId", channel.UUID);
request.AddHeader("Content-Type", "application/json; charset=utf-8");
request.AddJsonBody(channelJson);
IRestResponse response = client.Execute(request);
if (response.StatusCode == HttpStatusCode.OK)
{
}
else {
}
But I am getting following error (StatusCode: BadRequest):
"{\n \"error\" : \"Invalid data; couldn't parse JSON object, array, or value.\"\n}\n"
I've tried PUTing same data using curl and it worked. Can't figure out where I am doing wrong.

The object is being serialized twice (double serialized).
Pass the channel object as it is to AddJsonBody and the request will serialize it to JSON before sending body
request.AddJsonBody(channel);
assuming here channel is an object of a Class

I have modified the code with slight changes. Please try with this
RestRequest request = new RestRequest("MemberAndChannels/{userId}/{channelId}.json", Method.POST);
request.AddParameter("auth", accessKey); // or request.AddHeader("auth", accessKey);
request.AddUrlSegment("userId", user.UUID);
request.AddUrlSegment("channelId", channel.UUID);
request.AddHeader("Content-Type", "application/json");
request.AddHeader("Accept", "application/json");
request.AddParameter("application/json", channelJson, ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
if (response.StatusCode == HttpStatusCode.OK)
{
}
else {
}

I had the same problem.
I soved it changing this code:
request.AddParameter("auth", accessKey);
by
request.AddQueryParameter("auth", accessKey);
I hope help you.
Regards

oAuth uStream API

I'm trying to get data from uStream using their API and oAuth. I can get the auth token and that token does work in Rest API Client and I can get data. I however cannot get data in my project... I keep getting 401 unauth..
Code:
protected void Page_Load(object sender, EventArgs e)
{
var client = new RestClient("https://www.ustream.tv/oauth2/token");
var request = new RestRequest(Method.POST);
request.AddHeader("authorization", "Basic xxxxxxxxxxxxxxxxxx");
request.AddHeader("content-type", "application/x-www-form-urlencoded");
request.AddParameter("application/x-www-form-urlencoded", "client_secret=xxxxxxxxxxxxx&client_id=xxxxxxxxxxxx&grant_type=client_credentials&=", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
IRestResponse<TokenObject> response2 = (IRestResponse<TokenObject>)client.Execute<TokenObject>(request);
var tknName = response2.Data.access_token;
GetData(tknName);
}
public void GetData(string token)
{
var client = new RestClient("https://api.ustream.tv/channels/206844441.json");
var request = new RestRequest(Method.GET);
request.AddHeader("authorization", "Bearer" + token);
request.AddHeader("content-type", "application/x-www-form-urlencoded");
IRestResponse jsonResponse = client.Execute(request);
IRestResponse<Channel> json2Response2 = (IRestResponse<Channel>)client.Execute<Channel>(request);
var blah = json2Response2.Content;
}
The jsonResponse comes back 401... but I can use the token in API client like Insomnia and it will work... I can get data.
Any ideas on what I'm doing wrong?
Thanks!

Assuming token is not prefixed with a single space, then this line:
request.AddHeader("authorization", "Bearer" + token);
Should instead be (added a space after Bearer):
request.AddHeader("authorization", "Bearer " + token);
Additionally, the GET request for data does not require the Content-Type header to be added to the request; although including is unlikely to cause an error.

As João mentioned, the main problem will be the missing space character between the string "Bearer" and the token itself . After you fix this i'm pretty sure it will work.
Yes, Content-Type is superfluous for GET request, but it does not harm the success of your request.
In addition, you don't need to provide client secret twice. That's enough to provide it through the Authorization header or the client_secret property in the request body.
So, that's enough to provide the secret that way:
request.AddHeader("authorization", "Basic xxxxxxxxxxxxxxxxxx");
Ant in this case you shouldn't provide the secret again in the request body, here's the modified call, based on the original code:
request.AddParameter("application/x-www-form-urlencoded", "client_id=xxxxxxxxxxxx&grant_type=client_credentials&=", ParameterType.RequestBody);

There were actually two things I had wrong. First one pointed out by #João Angelo was the missing space between the string: Bearer & token.
Second and most frustrating was that authorization needed to be Authorization... with the capital A. Now it works... .Thanks for the help.