ActionResult

时间：2022-03-18 02:06:21

ActionResult

public abstract class ActionResult

{

public abstract void ExecuteResult(ControllerContext context);

}

  1. EmptyResult

无论一个Action返回值是Void还是其他数据类型,都会创建相应的ActionResult.

如果一个Action方法的返回值时Void或者Null,会生成一个EmptyResult对象.

EmptyResult主要起到了适配器的作用,让所有的用法保持一致.

ActionInvoker中,执行Action方法后,根据返回值判断

protected virtual ActionResult CreateActionResult(ControllerContext controllerContext, ActionDescriptor actionDescriptor, object actionReturnValue)

    {

        if (actionReturnValue == null)//Action的返回值为Void或者Null

{

            return new EmptyResult();

        }

        ActionResult actionResult = (actionReturnValue as ActionResult) ??

        new ContentResult { Content = Convert.ToString(actionReturnValue, CultureInfo.InvariantCulture) };//如果返回值不是ActionResult,就创建ContentResult

        return actionResult;

    }

EmptyResult

  1. public class EmptyResult : ActionResult
    
    {

        private static readonly EmptyResult _singleton = new EmptyResult();

        internal static EmptyResult Instance
    
        {

            get { return _singleton; }

        }

        public override void ExecuteResult(ControllerContext context)
    
        {

        }

    }

    ContentResult

如果Action的返回值不是ActionResult,就创建ContentResult

ContentResult

public class ContentResult : ActionResult

    {

        public string Content { get; set; }

        public Encoding ContentEncoding { get; set; }

        public string ContentType { get; set; }

        public override void ExecuteResult(ControllerContext context)

        {

            if (context == null) {

                throw new ArgumentNullException("context");

            }

            HttpResponseBase response = context.HttpContext.Response;

            if (!String.IsNullOrEmpty(ContentType)) {

                response.ContentType = ContentType;

            }

            if (ContentEncoding != null) {

                response.ContentEncoding = ContentEncoding;

            }

            if (Content != null) {

                response.Write(Content);

            }

        }

    }

Controller中定义了几个创建ContentResult的封装方法

  1. protected internal ContentResult Content(string content)
    
    {

        return Content(content, null /* contentType */);

    }

    protected internal ContentResult Content(string content, string contentType)
    
    {

        return Content(content, contentType, null /* contentEncoding */);

    }

    protected internal virtual ContentResult Content(string content, string contentType, Encoding contentEncoding)
    
    {

        return new ContentResult {

            Content = content,

            ContentType = contentType,

            ContentEncoding = contentEncoding

        };

    }

    FileResult

可以将某个物理文件的内容给客户端.如果指定了文件名,就采用附件的方式下载文件.

FileResult

public abstract class FileResult : ActionResult

{

    private string _fileDownloadName;

    protected FileResult(string contentType)

    {

        if (String.IsNullOrEmpty(contentType)) {

            throw new ArgumentException(MvcResources.Common_NullOrEmpty, "contentType");

        }

        ContentType = contentType;

    }

    public string ContentType { get; private set; }

    public string FileDownloadName

    {

        get { return _fileDownloadName ?? String.Empty; }

        set { _fileDownloadName = value; }

    }

    public override void ExecuteResult(ControllerContext context)

    {

        if (context == null) {

            throw new ArgumentNullException("context");

        }

        HttpResponseBase response = context.HttpContext.Response;

        response.ContentType = ContentType;

        if (!String.IsNullOrEmpty(FileDownloadName)) {

            string headerValue = ContentDispositionUtil.GetHeaderValue(FileDownloadName);

            context.HttpContext.Response.AddHeader("Content-Disposition", headerValue);

        }

        WriteFile(response);

    }

}

文件下载方式有两种

针对文件的响应具有两种形式，即内联(Inline) 和附件(Attachment) 。一般来说，前者会利用浏览器直接打开响应的文件，而后者会以独立的文件下载到客户端。对于后者，我们一般会为下载的文件指定一个文件名，这个文件名可以通过FileResult 的FileDownloadName 属性来指定。文件响应在默认情况下采用内联的方式，如果需要采用附件的形式，需要为响应创建一个名称为"Content-Disposition" 的报头，该报头值的格式为

"attachment; filename={FileDownloadName} "。

有三种FileResult

  • FileContentResult

针对文件内容创建的FileResult.直接将文件内容写入到Response的OutputStream中

FileContentResult

public class FileContentResult : FileResult

{

    public FileContentResult(byte[] fileContents, string contentType)

        : base(contentType)

    {

        if (fileContents == null) {

            throw new ArgumentNullException("fileContents");

        }

        FileContents = fileContents;

    }

    public byte[] FileContents { get; private set; }

    protected override void WriteFile(HttpResponseBase response)

    {

        response.OutputStream.Write(FileContents, 0, FileContents.Length);

    }

}
  • FilePathResult

根据物理文件路径创建FileResult.调用 response.TransmitFile(FileName)输出文件

FilePathResult

public class FilePathResult : FileResult

{

    public FilePathResult(string fileName, string contentType)

        : base(contentType)

    {

        if (String.IsNullOrEmpty(fileName)) {

            throw new ArgumentException(MvcResources.Common_NullOrEmpty, "fileName");

        }

        FileName = fileName;

    }

    public string FileName { get; private set; }

    protected override void WriteFile(HttpResponseBase response)

    {

        response.TransmitFile(FileName);

    }

}
  • FileStreamResult

FileStreamResult

public class FileStreamResult : FileResult

{

    private const int BufferSize = 0x1000;

    public FileStreamResult(Stream fileStream, string contentType)

        : base(contentType)

    {

        if (fileStream == null) {

            throw new ArgumentNullException("fileStream");

        }

        FileStream = fileStream;

    }

    public Stream FileStream { get; private set; }

    protected override void WriteFile(HttpResponseBase response)

    {

        Stream outputStream = response.OutputStream;

        using (FileStream) {

            byte[] buffer = new byte[BufferSize];

            while (true) {

                int bytesRead = FileStream.Read(buffer, 0, BufferSize);

                if (bytesRead == 0) {

                    // no more data

                    break;

                }

                outputStream.Write(buffer, 0, bytesRead);

            }

        }

    }

}
  • Controller中定义的封装方法

ActionResult

  1. JavaScriptResult

貌似和浏览器有关系,谷歌不执行,直接返回字符串了

在服务端生成一段JS,作为响应返回给客户端,并且在客户端执行.

JavaScriptResult就是将ContentType设置为javascript,然后直接写入JS内容,因此,完全可以用ContentResult实现这个效果,只需要设置ContentType的类型为Scrippt就可以了

JavaScriptResult

public class JavaScriptResult : ActionResult

{

    public string Script { get; set; }

    public override void ExecuteResult(ControllerContext context)

    {

        if (context == null) {

            throw new ArgumentNullException("context");

        }

        HttpResponseBase response = context.HttpContext.Response;

        response.ContentType = "application/x-javascript";

        if (Script != null) {

            response.Write(Script);

        }

    }

}
  1. JsonResult

默认情况下,不允许Get请求Json数据

JsonResult

public class JsonResult : ActionResult

{

    public JsonResult()

    {

        JsonRequestBehavior = JsonRequestBehavior.DenyGet;

    }

    public Encoding ContentEncoding { get; set; }

    public string ContentType { get; set; }

    public object Data { get; set; }

    public JsonRequestBehavior JsonRequestBehavior { get; set; }

    public int? MaxJsonLength { get; set; }

    public int? RecursionLimit { get; set; }

    public override void ExecuteResult(ControllerContext context)

    {

        if (context == null) {

            throw new ArgumentNullException("context");

        }

        if (JsonRequestBehavior == JsonRequestBehavior.DenyGet &&

        String.Equals(context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase)) {

            throw new InvalidOperationException(MvcResources.JsonRequest_GetNotAllowed);

        }

        HttpResponseBase response = context.HttpContext.Response;

        if (!String.IsNullOrEmpty(ContentType)) {

            response.ContentType = ContentType;

        } else {

            response.ContentType = "application/json";

        }

        if (ContentEncoding != null) {

            response.ContentEncoding = ContentEncoding;

        }

        if (Data != null) {

            JavaScriptSerializer serializer = new JavaScriptSerializer();

            if (MaxJsonLength.HasValue) {

                serializer.MaxJsonLength = MaxJsonLength.Value;

            }

            if (RecursionLimit.HasValue) {

                serializer.RecursionLimit = RecursionLimit.Value;

            }

            response.Write(serializer.Serialize(Data));

        }

    }

}

JsonRequestBehavior

public enum JsonRequestBehavior

{

AllowGet,

DenyGet,

}

  1. HttpStatusCodeResult

设置Response的StatusCode

HttpStatusCodeResult

public HttpStatusCodeResult(int statusCode, string statusDescription)

{

StatusCode = statusCode;

StatusDescription = statusDescription;

}

public int StatusCode { get; private set; }

public string StatusDescription { get; private set; }

public override void ExecuteResult(ControllerContext context)

{

if (context == null)

{

throw new ArgumentNullException("context");

}

context.HttpContext.Response.StatusCode = StatusCode;

if (StatusDescription != null)

{

context.HttpContext.Response.StatusDescription = StatusDescription;

}

}

  1. RedirectResult/RedirectToRouteResult

客户端的浏览器地址会变化

其作用与调用HttpResponse 的Redirect/RedirectPermanent 方法完全一致

暂时重定向和永久重定向有时又被称为"302 重定向"和"301 重定向"， 302 和301 表示响应的状态码。当我们调用HttpResponse 的RedirectIRedirectPermanent 方法时，除了会设置相应的响应状态码之外，还会将重定向的目标地址写入响应报头(Location) ，浏览器在接收到响应之后自动发起针对重定向目标地址的访问。

RedirectResult

public bool Permanent { get; private set; }

public string Url { get; private set; }

public override void ExecuteResult(ControllerContext context)

{

if (context == null)

{

throw new ArgumentNullException("context");

}

if (context.IsChildAction)

{

throw new InvalidOperationException(MvcResources.RedirectAction_CannotRedirectInChildAction);

}

string destinationUrl = UrlHelper.GenerateContentUrl(Url, context.HttpContext);

context.Controller.TempData.Keep();

if (Permanent)

{

context.HttpContext.Response.RedirectPermanent(destinationUrl, endResponse: false);

}

else

{

context.HttpContext.Response.Redirect(destinationUrl, endResponse: false);

}

}

RedirectToRouteResult

根据路由生成URL,

再进行重定向

public class RedirectToRouteResult : ActionResult

{

    private RouteCollection _routes;

    public RedirectToRouteResult(RouteValueDictionary routeValues)

        :

        this(null, routeValues)

    {

    }

    public RedirectToRouteResult(string routeName, RouteValueDictionary routeValues)

        : this(routeName, routeValues, permanent: false)

    {

    }

    public RedirectToRouteResult(string routeName, RouteValueDictionary routeValues, bool permanent)

    {

        Permanent = permanent;

        RouteName = routeName ?? String.Empty;

        RouteValues = routeValues ?? new RouteValueDictionary();

    }

    public bool Permanent { get; private set; }

    public string RouteName { get; private set; }

    public RouteValueDictionary RouteValues { get; private set; }

    internal RouteCollection Routes

    {

        get

        {

            if (_routes == null) {

                _routes = RouteTable.Routes;

            }

            return _routes;

        }

        set { _routes = value; }

    }

    public override void ExecuteResult(ControllerContext context)

    {

        if (context == null) {

            throw new ArgumentNullException("context");

        }

        if (context.IsChildAction) {

            throw new InvalidOperationException(MvcResources.RedirectAction_CannotRedirectInChildAction);

        }

        string destinationUrl = UrlHelper.GenerateUrl(RouteName, null /* actionName */, null /* controllerName */, RouteValues, Routes, context.RequestContext, false /* includeImplicitMvcValues */);

        if (String.IsNullOrEmpty(destinationUrl)) {

            throw new InvalidOperationException(MvcResources.Common_NoRouteMatched);

        }

        context.Controller.TempData.Keep();

        if (Permanent) {

            context.HttpContext.Response.RedirectPermanent(destinationUrl, endResponse: false);

        } else {

            context.HttpContext.Response.Redirect(destinationUrl, endResponse: false);

        }

    }

}

ActionResult

ViewResult和ViewEngine

  1. View引擎中的View

IView

public interface IView

{

void Render(ViewContext viewContext, TextWriter writer);

}

ViewContext

ActionResult

ActionResult

ActionResult

  1. ViewEngine

IViewEngine

public interface IViewEngine

{

ViewEngineResult FindPartialView(ControllerContext controllerContext, string partialViewName, bool useCache);

ViewEngineResult FindView(ControllerContext controllerContext, string viewName, string masterName, bool useCache);

void ReleaseView(ControllerContext controllerContext, IView view);

}

ViewEngineResult

public class ViewEngineResult

{

    public ViewEngineResult(IEnumerable<string> searchedLocations)

    {

        if (searchedLocations == null) {

            throw new ArgumentNullException("searchedLocations");

        }

        SearchedLocations = searchedLocations;

    }

    public ViewEngineResult(IView view, IViewEngine viewEngine)

    {

        if (view == null) {

            throw new ArgumentNullException("view");

        }

        if (viewEngine == null) {

            throw new ArgumentNullException("viewEngine");

        }

        View = view;

        ViewEngine = viewEngine;

    }

    public IEnumerable<string> SearchedLocations { get; private set; }

    public IView View { get; private set; }

    public IViewEngine ViewEngine { get; private set; }

}

ViewEngines

public static class ViewEngines

{

    private static readonly ViewEngineCollection _engines = new ViewEngineCollection

{

new WebFormViewEngine(),

new RazorViewEngine(),

};

    public static ViewEngineCollection Engines

    {

        get { return _engines; }

    }

}

ViewEngineCollection

ViewEngineCollection 同样定义了FindViewlF indPartialView 方法用于获取指定名称的View 和分部View

public class ViewEngineCollection : Collection<IViewEngine>

{

    private IResolver<IEnumerable<IViewEngine>> _serviceResolver;

    public ViewEngineCollection()

    {

        _serviceResolver = new MultiServiceResolver<IViewEngine>(() => Items);

    }

    public ViewEngineCollection(IList<IViewEngine> list)

        : base(list)

    {

        _serviceResolver = new MultiServiceResolver<IViewEngine>(() => Items);

    }

    public virtual ViewEngineResult FindPartialView(ControllerContext controllerContext, string partialViewName)

    {

        if (controllerContext == null) {

            throw new ArgumentNullException("controllerContext");

        }

        if (String.IsNullOrEmpty(partialViewName)) {

            throw new ArgumentException(MvcResources.Common_NullOrEmpty, "partialViewName");

        }

        return Find(e => e.FindPartialView(controllerContext, partialViewName, true),

        e => e.FindPartialView(controllerContext, partialViewName, false));

    }

    public virtual ViewEngineResult FindView(ControllerContext controllerContext, string viewName, string masterName)

    {

        if (controllerContext == null) {

            throw new ArgumentNullException("controllerContext");

        }

        if (String.IsNullOrEmpty(viewName)) {

            throw new ArgumentException(MvcResources.Common_NullOrEmpty, "viewName");

        }

        return Find(e => e.FindView(controllerContext, viewName, masterName, true),

        e => e.FindView(controllerContext, viewName, masterName, false));

    }

}
  1. ViewResult的执行

如果Action的返回值不是ActionResult,就创建ContentResult

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