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asp.net mvc之ActionResult

2018-06-22 07:50:53来源：未知阅读 ()

Web服务器接收到一个客户端请求以后，会对请求予以相应，而这个响应是通过Response来控制的，

但是在asp.net mvc 里，这部分的工作是由ActionResult来完成的，

ActionResult是一个抽象类，所以具体的工作还是由很多个子类来完成，

具体的子类有

EmptyResult，

ContentResult

(通过Content，ContentEncoding,ContentType 分别设置返回的内容，字符编码格式以及媒体类型)，

FileResult(FileContentResult,FilePathResult，FileStreamResult)，

<p>Use this area to provide additional information.</p>
<a href="@Url.Action("ImagePath1", new  { id="1" })">下载</a>

<img src="@Url.Action("ImagePath1", new  { id="1" })" />

<img src="@Url.Action("ImagePath", new  { id="1" })" />

<img src="@Url.Action("ImageContent", new  { id="1" })" />

<img src="@Url.Action("ImageStream", new  { id="1" })" />

        public ActionResult ImagePath(string id)
        {
            string path = Server.MapPath("/images/" + id + ".jpeg");
            return File(path, "image/jpeg");
        }

        public ActionResult ImagePath1(string id)
        {
            string path = Server.MapPath("/images/" + id + ".jpeg");
            return File(path, "image/jpeg", "下载");
        }


        public ActionResult ImageContent(string id)
        {
            string path = Server.MapPath("/images/" + id + ".jpeg");
            byte[] heByte = null;
            using (FileStream fsRead = new FileStream(path, FileMode.Open, FileAccess.Read))
            {
                int fsLen = (int)fsRead.Length;
                heByte = new byte[fsLen];
                int r = fsRead.Read(heByte, 0, heByte.Length);
            }
            return File(heByte, "image/jpeg");
        }
        public ActionResult ImageStream(string id)
        {
            string path = Server.MapPath("/images/" + id + ".jpeg");
            FileStream fsRead = new FileStream(path, FileMode.Open, FileAccess.Read);

            return File(fsRead, "image/jpeg");

        }