将base64从javascript传递到C＃服务器函数

Question

I want to save an image on a server by sending its properties via ajax.. In the JS I'm encoding the image in base64 before I send it (along with other parameters i need):

    $.ajax({
            type: 'POST',
            url: 'PhotoSelect.aspx/GetData',
            data: JSON.stringify({ action: "save", x: x, y: y, width: width, height: height, type: type, obj_id: obj_id, image: image, team: teamVal, jersey: jerseyVal, spot: spotVal }),
            contentType: 'application/json; charset=utf-8',
            dataType: 'json'
})

And i receive the request on server side by:

[WebMethod]
[ScriptMethod(UseHttpGet = false, ResponseFormat = ResponseFormat.Json)]
public static JsonReturn GetData(string action, string x, string y, string width, string height, string type, string obj_id, string image, string team, string jersey, string spot)
{
//Process Image
}

Now the weird part is that this works (by this i mean it reaches the GetData function) for some images! When i attempt to send a smaller (or lower quality) image this works. When i attempt to send images that have really long base64 strings it doesnt reach the function..

Can anyone think of anything that might be wrong with this?

Answer 1

Thank you guys for your suggestions... for any others that might look for a solution:

You have to increase the maxJSONLength by adding this in your web.config

<system.web.extensions>
   <scripting>
     <webServices>
        <jsonSerialization maxJsonLength="50000000"/> <!-- Set the maximum request size  (the value is in KB here) -->
     </webServices>
   </scripting>
</system.web.extensions>