在ASP.NET MVC2中将http 204"无内容"返回给客户端

Question

在我所拥有的ASP.net MVC 2应用程序中,我想要对post操作返回204 No Content响应.当前我的控制器方法有一个void返回类型,但这会将客户端的响应发送回200 OK,并将Content-Length标头设置为0.如何将响应发送到204？

[HttpPost]
public void DoSomething(string param)
{
    // do some operation with param

    // now I wish to return a 204 no content response to the user 
    // instead of the 200 OK response
}

Answer 1

在MVC3中有一个HttpStatusCodeResult类.您可以为MVC2应用程序滚动自己:

public class HttpStatusCodeResult : ActionResult
{
    private readonly int code;
    public HttpStatusCodeResult(int code)
    {
        this.code = code;
    }

    public override void ExecuteResult(System.Web.Mvc.ControllerContext context)
    {
        context.HttpContext.Response.StatusCode = code;
    }
}

您必须改变您的控制器方法,如下所示:

[HttpPost]
public ActionResult DoSomething(string param)
{
    // do some operation with param

    // now I wish to return a 204 no content response to the user 
    // instead of the 200 OK response
    return new HttpStatusCodeResult(HttpStatusCode.NoContent);
}

Answer 2

您可以简单地返回 IHttpActionResult 并使用StatusCode：

public IHttpActionResult DoSomething()
{
    //do something

    return StatusCode(System.Net.HttpStatusCode.NoContent);        
}

Answer 3

从 ASP.NET Core 1.0+ (2016) 开始更新

您可以返回一个NoContentActionResult。

[HttpPost("Update")]
public async Task<IActionResult> DoSomething(object parameters)
{
    // do stuff
    return NoContent();
}