所以我正在建立一个网站，当用户可以上传他的横幅图像作为横幅个人资料时，我想在其中实现添加横幅表单。
这就是我提出的问题，当我运行代码时，它总是返回 null。
这是我的 Controller :
[HttpPost]
public async Task<ActionResult> AddBannerDataAsync(BannerViewModels abd)
{
if (ModelState.IsValid)
{
string uniqueFileName = null;
if (abd.BannerImg1 != null)
{
string uploadsFolder = Path.Combine(WebHostEnvironment.WebRootPath, "Images");
uniqueFileName = Guid.NewGuid().ToString() + "_" + abd.BannerImg1.FileName;
using (var fs = new FileStream(Path.Combine(uploadsFolder, uniqueFileName), FileMode.Create))
{
await abd.BannerImg1.CopyToAsync(fs);
}
}
Banner bnr = new Banner
{
BannerTitle = abd.BannerTitle,
BannerDescription = abd.BannerDescription,
//BannerImg = abd.BannerImg,
//BannerImg = uniqueFileName,
BannerUrl = abd.BannerUrl,
BannerIndex = abd.BannerIndex
};
_db.Banner.Add(bnr);
_db.SaveChanges();
}
return Redirect("addbanner");
}
这是我的 View 模型:
using Microsoft.AspNetCore.Http;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using SZGMC.Web.Models;
namespace SZGMC.Web.Areas.Admin.ViewModels
{
public class BannerViewModels
{
public int BannerId { get; set; }
public string BannerTitle { get; set; }
public string BannerDescription { get; set; }
public string BannerImg { get; set; }
public IFormFile BannerImg1 { get; set; }
public string BannerUrl { get; set; }
public string BannerIndex { get; set; }
public int? BMasterId { get; set; }
public byte? IsDeleted { get; set; }
public virtual BannerMaster BMaster { get; set; }
}
}
这是我的 View 文件:
<form asp-controller="Home" asp-action="AddBannerData" method="post" autocomplete="off">
<div id="main-content">
<div class="container-fluid">
<!-- Page header section -->
<div class="block-header">
<div class="row clearfix">
<div class="col-lg-6 col-md-5 col-sm-12">
<h1>Hi, Welcomeback!</h1>
<span>You can add banner here</span>
</div>
<div class="col-xl-6 col-md-7 col-sm-12 text-md-right">
<div class="d-flex align-items-center justify-content-md-end mt-4 mt-md-0 flex-wrap vivify pullUp delay-550">
<div class="mb-3 mb-xl-0 ">
@*<a href="setting.html" class="btn btn-default">Settings</a>*@
<a asp-action="BannerDetails" class="btn btn-dark">Banner List</a>
</div>
</div>
</div>
</div>
</div>
<div class="row clearfix">
<div class="col-12">
<div class="card">
<div class="body">
<div class="header">
<h2><strong>Enter Banner Details</strong></h2>
</div>
<br />
<div class="row">
<div class="col-12">
<div class="form-group c_form_group">
<div class="input-group">
<div class="input-group-prepend">
<span class="input-group-text"></span>
</div>
<input type="text" class="form-control" asp-for="BannerTitle" placeholder="Banner Title" aria-label="bannertitle" aria-describedby="basic-addon1">
</div>
</div>
</div>
</div>
<div class="row">
<div class="col-12">
<div class="form-group c_form_group">
<div class="input-group">
<div class="input-group-prepend">
<span class="input-group-text"></span>
</div>
<input type="text" class="form-control" asp-for="BannerUrl" placeholder="Banner Url" aria-label="bannerurl" aria-describedby="basic-addon1">
</div>
</div>
</div>
</div>
<div class="row">
<div class="col-6">
<div class="form-group c_form_group">
<label>Banner Description</label>
<div class="input-group">
<textarea class="form-control" asp-for="BannerDescription" aria-label="Banner Description" rows="6"></textarea>
</div>
</div>
</div>
<div class="col-6">
<div class="drop-zone">
<span class="drop-zone__prompt">Drop file here or click to upload</span>
<input type="file" asp-for="BannerImg1" name="BannerImg1" class="drop-zone__input" accept="image/*" data-allowed-file-extensions='["jpg", "png" , "jpeg"]' required>
</div>
</div>
</div>
<div class="row">
<div class="col-6">
<div class="form-group c_form_group">
<div class="input-group">
<div class="input-group-prepend">
<span class="input-group-text"></span>
</div>
<input type="text" class="form-control" asp-for="BannerIndex" placeholder="Banner Index" aria-label="bannerindex" aria-describedby="basic-addon1">
</div>
</div>
</div>
<div class="col-6">
<div class="form-group c_form_group">
@Html.DropDownListFor(x => x.BMasterId, ViewBag.MasterBanner as SelectList, "Choose Banner Type", new { @class = "form-control" })
</div>
</div>
</div>
<div class="mb-2" align="center">
<button type="submit" class="btn btn-success btn-round">Add Banner</button>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</form>
当我尝试在浏览器中上传 img 时，它不会抛出任何异常，它只是不会将图像上传到数据库并且该列为 NULL。
提前感谢大家的帮助或建议。
最佳答案
您必须在表单标记上使用 enctype="multipart/form-data" 属性。
<form asp-controller="Home" asp-action="AddBannerData" method="post" autocomplete="off" enctype="multipart/form-data">
<div id="main-content">
....
关于asp.net - IFormFile 上传图像 ASP.NET core MVC 始终显示空值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/71359898/