Use Variable in StringContent

Question

Is it possible to have a variable in StringContent?

Currently my Code looks like this (It's about \"text\": \"this is my message\"):

myRequestMessage.Content = new StringContent("{\"type\": \"message\", \"text\": \"this is my message\", \"from\": {\"id\": \"myID\", \"name\": \"myName\"}}", System.Text.Encoding.UTF8, "application/json");

But I want to have it like this (\"text\": "+myOwnString+"):

myOwnString = "this is my text";
myRequestMessage.Content = new StringContent("{\"type\": \"message\", \"text\": "+myOwnString+", \"from\": {\"id\": \"myID\", \"name\": \"myName\"}}", System.Text.Encoding.UTF8, "application/json");

My problem is when doing it like I want to have it I get a StatusCode 400, ReasonPhrase: Bad Request from var myResponse = await myClient.SendAsync(myRequestMessage);. So I assume I have to write it differently to make it work.

Does anyone know a fix?

You still need to wrap the string you provide in double-quotes for it to be valid json. So \"text\": \"" + myOwnString + "\" — Jonathon Chase
– Jonathon Chase, Commented Jul 29, 2019 at 14:42

stuartd · Accepted Answer · 2019-07-29 14:47:26Z

5

This kind of operation becomes much easier, more readable and robust if you serialize an anonymous type instead of using concatenation:

var output = new {
    type = "message",
    text = "this is any message you want it to be",
    from = new {
            id = "myId",
            name = "myName"
    }
};

var outputJson = JsonConvert.SerializeObject(output);

Result:

{
  "type": "message",
  "text": "this is any message you want it to be",
  "from": {
    "id": "myId",
    "name": "myName"
  }
}

answered Jul 29, 2019 at 14:47

stuartd

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Matt Rowland · Accepted Answer · 2019-07-29 14:43:12Z

3

It seems like you are missing the quotes around the text that you concatenated.

Try this:

myRequestMessage.Content = new StringContent("{\"type\": \"message\", \"text\": \""+myOwnString+"\", \"from\": {\"id\": \"myID\", \"name\": \"myName\"}}", System.Text.Encoding.UTF8, "application/json");

answered Jul 29, 2019 at 14:43

Matt Rowland

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