Question

我想直接在视图中显示图像，所以我调用一个动作方法并在输出流中写入图像。

但我收到的错误是“图片无法显示，因为它包含错误”。我确信图像生成正常，但不确定我的控制器代码有什么问题..有没有人遇到过这种情况？

提前致谢..

这是我的控制器动作

[ChildActionOnly]
    public ActionResult GetCaptcha()
    {

        try
        {
            this.Session["CaptchaImageText"] = GenerateRandomCode();

            this.Response.Clear();

            this.Response.ContentType = "image/jpeg";

            Bitmap img = new Bitmap(Server.MapPath("../Images/captcha.jpg"));

            Graphics graphicImage = Graphics.FromImage(img);
            graphicImage.SmoothingMode = SmoothingMode.AntiAlias;

            graphicImage.DrawString(this.Session["CaptchaImageText"].ToString(),
                                    new Font("Arial", 12, FontStyle.Bold),
                                    SystemBrushes.WindowText, new Point(100, 250));

            graphicImage.DrawArc(new Pen(Color.Red, 3), 90, 235, 150, 50, 0, 360);

            //Save the new image to the response output stream.
            img.Save(this.Response.OutputStream, ImageFormat.Jpeg); 

            // Create a CAPTCHA image using the text stored in the Session object.

            graphicImage.Dispose();
            img.Dispose();
        }
        catch (Exception ex)
        {
            ex = null;
        }
        var v = new FileStreamResult(Response.OutputStream,"image/jpeg");
        return v;
    }

以下是我从视图

调用action方法的方法

    <tr><td> <iframe width="200px" height="80px" frameborder="1" scrolling="no"> <img src="@Url.Action("GetCaptcha")" alt="SimpleChart" /> </iframe>  </td></tr>

Answer 1

您需要返回文件而不是EmptyResult。

return File(imageByteData, "image/png");

并在视图方面：

<tr><td> <iframe>  <img src='@Url.Action("GetCaptcha")'/> </iframe>  </td></tr>

<强>更新

不要写回复，而是在下面写。

[ChildActionOnly]
public ActionResult GetCaptcha()
{

    try
    {
        byte[] imageByteData = null
        this.Session["CaptchaImageText"] = GenerateRandomCode();

        this.Response.Clear();

        this.Response.ContentType = "image/jpeg";

        Bitmap img = new Bitmap(Server.MapPath("../Images/captcha.jpg"));

        Graphics graphicImage = Graphics.FromImage(img);
        graphicImage.SmoothingMode = SmoothingMode.AntiAlias;

        graphicImage.DrawString(this.Session["CaptchaImageText"].ToString(),
                                new Font("Arial", 12, FontStyle.Bold),
                                SystemBrushes.WindowText, new Point(100, 250));

        graphicImage.DrawArc(new Pen(Color.Red, 3), 90, 235, 150, 50, 0, 360);

        MemoryStream stream = new MemoryStream();
            bitmap.Save(stream, ImageFormat.Jpeg);
            imageByteData = stream.ToArray();

        // Create a CAPTCHA image using the text stored in the Session object.

        graphicImage.Dispose();
        img.Dispose();
        return File(imageByteData, "image/png"); 
    }
    catch (Exception ex)
    {
        ex = null;
    }

}

Answer 2

我认为你使用的是FileStreamResult错误。

将img.Save（...）更改为内存流，并在FileStreamResult（...）中返回该内存流。

ASP.NET MVC Image响应输出流。不工作

2 个答案: