c# - 在 MVC3 的控件方法中返回文件

Question

我有一个上传管理器，我想在用户像这样调用我的控件的特殊方法时返回一个文件:

www.website.com/upload/getfile/?fileID=100

我该怎么做？我想知道如何返回文件!

---

我找到了答案并在下面编写了示例代码:

public FilePathResult GetFile(string Name)
    {
        FilePathResult s = new FilePathResult(@"C:/"+Name, "File");
        Response.Headers.Clear();

        return s;
    }

但是现在有一个问题。如果我使用 File 作为我的 ContentType 有什么问题吗？因为我不知道。

Answer 1

创建一个名为 uploadController 的 Controller ，带有一个名为 getfile 的操作，该操作有一个参数。

那么上面的url可以改成

www.website.com/upload/getfile/100

更新:

将操作的返回类型更改为FileResult

要获得完整答案，请查看我的部分代码库:

//Attachment Class
public class Attachment
{
    #region Properties

    public virtual Guid AttachmentId { get; set; }
    public virtual int? ContentLength { get; set; }
    public virtual string ContentType { get; set; }
    public virtual byte[] Contents { get; set; }
    public virtual DateTime? DateAdded { get; set; }
    public virtual string FileName { get; set; }
    public virtual string Title { get; set; }

    #endregion
 }


public class AttachmentController : Controller
{
     IAttachmentService attachmentService;

    public AttachmentController(IAttachmentService attachmentService)
    {
        this.attachmentService = attachmentService;
    }

    public ActionResult Index(Guid id)
    {
        var attachment = this.attachmentService.GetById(id);
        return attachment.IsNull() ? null : this.File(attachment.Contents, attachment.ContentType,attachment.FileName);
    }
}

public class AttachmentModelBinder : IModelBinder
{
    public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        HttpRequestBase httpRequestBase = controllerContext.RequestContext.HttpContext.Request;
        HttpPostedFileBase @base = httpRequestBase.Files[bindingContext.ModelName];
        var converter = new FileConverter();
        Attachment attachment = converter.Convert(
                new ResolutionContext(
                    new TypeMap(new TypeInfo(typeof(HttpPostedFileWrapper)), new TypeInfo(typeof(Attachment))),
                    @base,
                    typeof(HttpPostedFileWrapper),
                    typeof(Attachment)));
        }
        return attachment;
    }
}

public class MvcApplication : HttpApplication
{
    protected void Application_Start()
    {
        ModelBinders.Binders[typeof(Attachment)] = new AttachmentModelBinder();
    }
}