MVC控制下输出图片、javascript与json格式

/// <summary>
/// 输出图片
/// </summary>
/// <returns></returns>
public ActionResult FileContentResultDemo()
{
    //创建一个文件流
    FileStream fs = new FileStream(Server.MapPath(@"/Content/a.jpg"), FileMode.Open, FileAccess.Read);
    //定义一个buffer数组
    byte[] buffer = new byte[Convert.ToInt32(fs.Length)];
    fs.Read(buffer, , Convert.ToInt32(fs.Length) );
    return File(buffer, @"image/gif");
}

/// <summary>
/// 输出图片
/// </summary>
/// <returns></returns>
public ActionResult FilePathResultDemo()
{
    //可以将一个jpg格式的图像输出为gif格式
    return File(Server.MapPath(@"/Content/a.jpg"), @"image/gif");
}

/// <summary>
/// 输出图片
/// </summary>
/// <returns></returns>
public ActionResult FileStreamResultDemo()
{
    FileStream fs = new FileStream(Server.MapPath(@"/Content/a.jpg"), FileMode.Open, FileAccess.Read);
    return File(fs, @"image/gif");
}

/// <summary>
/// 输出JavaScript代码
/// </summary>
/// <returns></returns>
public ActionResult JavaScriptResultDemo()
{
    return JavaScript(@"alert(""Test JavaScriptResultDemo!"")");
}

/// <summary>
/// 输出Json代码
/// </summary>
/// <returns></returns>
public ActionResult JsonResultDemo()
{
    var tempObj = new { Controller = "DemoController", Action = "JsonResultDemo" };
    return Json(tempObj, JsonRequestBehavior.AllowGet);
}