Pass an array from C# to JavaScript

Question

We have a JavaScript Office add-in. We are making an installable and executable add-in on top of it by VSTO and WebView2.

I just realize that it's not obvious to pass an array value from C# to JavaScript. For instance, on the side of C#, I have the following code:

public object test()
{
    int[,] xx = { { 1, 2, 3 }, { 3, 4, 5 } };
    return xx;
}

In JavaScript, I have

test () {
    return new Promise(async (resolve, reject) => {
        try {
            let result = await window.chrome.webview.hostObjects.control.test();
            console.log(result)
            console.log(JSON.stringify(result))
            resolve(result)
        } catch (error) {
            reject(error)
        }
    })
}

Then, in the console of JavaScript, it shows Array(0) and []. If I pass a string value from C# to JavaScript, it works well.

Does anyone know how to pass an array from C# to JavaScript?

Write the script on the back end an post it. There's not enough info to provide an example. <% JavaScriptCode %>. Have you tried converting to JSON? — Alex T.
– Alex T., Commented Jun 18, 2023 at 2:18
I believe this is one of the use cases dynamic was introduced for. But @AlexT. is right. More information is needed. I will note however that JavaScript does not support multi-dimensional arrays. It supports jagged arrays. Use a jagged array on the C# side as well if you're interoperating with the language that has no concept of a multi-dimensional array. — Aluan Haddad
– Aluan Haddad, Commented Jun 18, 2023 at 11:51
you can return Json object instead of returning object. the following link may help you. c-sharpcorner.com/UploadFile/2ed7ae/jsonresult-type-in-mvc — shirin monzavi
– shirin monzavi, Commented Jun 18, 2023 at 13:06

Eugene Astafiev · Accepted Answer · 2023-06-18 15:40:59Z

1

You must serialize objects and arrays to any format that suits your needs. But I think for JavaScript the most suitable format would be a JSON string, so you could get a ready made object in JavaScript. See Serialize c# array of strings to JSON array for more information.

answered Jun 18, 2023 at 15:40

Eugene Astafiev

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1 Comment

SoftTimur Over a year ago

Finally, i use JsonConvert.SerializeObject on the side of C#, and JSON.parse on the side of JavaScript.

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