transform the generic string list into a JavaScript array in the Handler

Looking to convert this list into an array so that I can access it on the client side with JS and loop through its values.

At the end of one of my .ashx methods, a list is returned like this:

equipmentTypes is a list of strings

        _httpContext.Response.ContentType = "text";
        _httpContext.Response.Write(equipmentTypes.ToArray());

However, when I receive it on the client side, all I get is the text "System.String[]". This is obviously not correct. What content type should I be returning instead?

I assume I can then evaluate this into an array (object) on the JavaScript side.

c#javascriptasp.netarrays

Answer №1

It is recommended to utilize JSON when transmitting data to javascript. Avoid using eval as it can leave your system vulnerable to various security risks (e.g. XSS).

For more information on C# and JSON, refer to this article which covers how to convert a C# array into JSON.

Answer №2

To add objects to the response stream in JSON format, it is recommended to serialize them first. The appropriate content-type for this is application/json. You have the option of utilizing either the built-in DataContract serialization or a third-party library like NewtonSoft JSON.Net.

When working on the client side, it is important to use JSON.parse instead of eval.

Answer №3

To create JSON on the server side, utilize the in-built JavaScriptSerializer.

var js = new System.Web.Script.Serialization.JavaScriptSerializer();
_httpContext.Response.ContentType = "application/json";
_httpContext.Response.Write(js.Serialize(equipmentTypes.ToArray()));

When handling the client side, you can employ JSON.parse (supported by modern browsers) to retrieve an array. Avoid using eval as it's not the appropriate method, despite limited security risks in controlled environments.

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