Question

我想使用动作方法显示图像。这是我在帐户控制器中的操作方法：

public ActionResult CaptchaImage(string prefix, bool noisy = true)
    {
        var rand = new Random((int)DateTime.Now.Ticks);

        //generate new question
        int a = rand.Next(10, 99);
        int b = rand.Next(0, 9);
        var captcha = string.Format("{0} + {1} = ?", a, b);

        //store answer
        Session["Captcha" + prefix] = a + b;

        //image stream
        FileContentResult img = null;

        using (var mem = new System.IO.MemoryStream())
        using (var bmp = new System.Drawing.Bitmap(130, 30))
        using (var gfx = System.Drawing.Graphics.FromImage((System.Drawing.Image)bmp))
        {
            gfx.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
            gfx.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
            gfx.FillRectangle(System.Drawing.Brushes.White, new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height));

            //add noise
            if (noisy)
            {
                int i, r, x, y;
                var pen = new System.Drawing.Pen(System.Drawing.Color.Yellow);
                for (i = 1; i < 10; i++)
                {
                    pen.Color = System.Drawing.Color.FromArgb(
                    (rand.Next(0, 255)),
                    (rand.Next(0, 255)),
                    (rand.Next(0, 255)));

                    r = rand.Next(0, (130 / 3));
                    x = rand.Next(0, 130);
                    y = rand.Next(0, 30);

                    gfx.DrawEllipse(pen, (float)x, (float)y, (float)r, (float)r);
                }
            }

            //add question
            gfx.DrawString(captcha, new System.Drawing.Font("Tahoma", 15), System.Drawing.Brushes.Gray, 2, 3);

            //render as Jpeg
            bmp.Save(mem, System.Drawing.Imaging.ImageFormat.Jpeg);
            img = this.File(mem.GetBuffer(), "image/Jpeg");
        }

        return img;
    }

这是我的HTML：

<img alt="Captcha" src="@Url.Action("CaptchaImage","Account")" />

问题是没有调用CaptchaImage并且没有显示图像。我该如何解决这个问题？

修改

我使用以下代码重新加载验证码图像，但它不会更改图像。

$(document).ready(function () {
        $("#imgCaptcha").click(function () {
            $.ajax({
                url: "/Account/CaptchaImage",
                success: function (result) {
                    $(this).src = result;
                },
            });
        });
    });

Answer 1

在你的图像中，src应该是图像路径。因此，您应该考虑先执行此逻辑并将路径传递给您的img源。

使用Action方法在MVC中返回图像

修改

1 个答案: