加载资源失败：服务器响应状态为 500（内部服务器错误），同时从控制器返回 base64 格式的图像

Question

I have the following code to crop the image :

   $.ajax({
        type: "POST",
        url: root("CropController/CropImage"),
        data: {
            imagePath: imagesrc,
            cropPointX: parseInt(PointX),
            cropPointY: parseInt(PointY),
            imageCropWidth: parseInt(CropWidth),
            imageCropHeight: parseInt(CropHeight)
        }
    }).done(function (dt) {
       alert(dt.photo);
    });

And the controller code is :

public JsonResult CropImage(string imagePath, int? cropPointX, int? cropPointY, int? imageCropWidth, int? imageCropHeight)
    {
        string output = imagePath.Substring(imagePath.IndexOf(',') + 1);
        byte[] imageBytes = Convert.FromBase64String(output);

            //croppedImage will have the cropped part of the image.
        byte[] croppedImage = ImageCroping.CropImage(imageBytes, cropPointX.Value, cropPointY.Value, imageCropWidth.Value, imageCropHeight.Value);

        string photo = "data:image/jpeg;base64," + Convert.ToBase64String(croppedImage);
        return Json(new { photoPath = photo }, JsonRequestBehavior.AllowGet);

    }

If the cropping area is small then the alert in done function will be called but it throws the error when the cropping area is large and the done function is not fired. Can anyone please help me with this. Thanks in advance

Answer 1

Try using ContentResult instead of JSON. It seems json has problem with its length or some wrong character in it Or may be with its GET allowed on return :

public ActionResult CropImage(string imagePath, int? cropPointX, int? cropPointY, int? imageCropWidth, int? imageCropHeight)
    {
        string output = imagePath.Substring(imagePath.IndexOf(',') + 1);
        byte[] imageBytes = Convert.FromBase64String(output);

            //croppedImage will have the cropped part of the image.
        byte[] croppedImage = ImageCroping.CropImage(imageBytes, cropPointX.Value, cropPointY.Value, imageCropWidth.Value, imageCropHeight.Value);

        string photo = "data:image/jpeg;base64," + Convert.ToBase64String(croppedImage);
        return Content(photo);

    }