我有一个上传图像文件并检查它们是jpgs的表单:
// CarAdmin/Index.cshtml
@model MySite.Models.Car
@using (Html.BeginForm("CarImageUpload", "Car", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
<input type="file" name="file" />
<input type="text" name="imageInfo" />
<input type="submit" value="OK" />
}
<form action="CarAJAX" method="post" name="CarAdminForm">
<input name="Make" value="@Model.Name/>
<input type="submit" value="Update Car Info">
</form>
// CarController.cs
[HttpPost]
public ActionResult CarImageUpload(HttpPostedFileBase file)
{
ValidateImageFile V = new ValidateImageFile(file); // checks that the file is a jpg
List<String> Validity = V.Issues;
if (Validity.Count == 0)
{
file.SaveAs(V.FilePath);
}
else
{
Response.Write(String.Join("<br>", Validity.ToArray()); // THIS IS PROBLY WRONG
}
RedirectToAction("CarAdmin");
}
public ActionResult CarAdmin()
{
return View("CarAdmin/Index.cshtml");
}
如果ValidateImageFile类发现问题,我想:
>提供有问题的输入
>在页面上显示消息
但是,我不确定如何从Controller中操作表单,而我的Response.Write没有发回任何东西(我可以看到 – 但我不知道如何访问它).
我对如何实现这一点有一些想法,但它们看起来像是一个胶带工作,而不是最佳实践.
最佳答案 用户Darian Dimitrov回答了一个与你非常相似的问题,他的解决方案应该指向正确的方向.
Is there a way to validate incoming HttpPostedFilebase files in MVC 2?
您尝试做的另一个好资源是:
http://cpratt.co/file-uploads-in-asp-net-mvc-with-view-models/
您的视图可能如下所示:
// CarAdmin/Index.cshtml
@model MySite.Models.CarUploadViewModel
@using (Html.BeginForm("CarImageUpload", "Car", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
<input type="file" name="ImageUpload" />
<input type="text" name="ImageInfo" />
<input type="submit" value="OK" />
}
<form action="CarAJAX" method="post" name="CarAdminForm">
<input name="Make" value="@Model.Name/>
<input type="submit" value="Update Car Info">
</form>
您的模型可能如下所示:
public class CarUploadViewModel
{
[Required]
public string ImageInfo{ get; set; }
[DataType(DataType.Upload)]
HttpPostedFileBase ImageUpload { get; set; }
}
您的控制器可能如下所示:
[HttpPost]
public ActionResult CarImageUpload(CarUploadViewModel model)
{
ValidateImageFile validity = new ValidateImageFile(model.ImageUpload); // checks that the file is a jpg
List<String> issues = validity.Issues;
if (issues.Count > 0)
{
// TODO: Add more descriptive issue messages
ModelState.AddModelError("ImageUpload", "There was an issue.");
}
if(ModelState.IsValid)
{
model.ImageUpload.SaveAs(V.FilePath);
RedirectToAction("CarAdmin");
}
return View(model);
}
基本上,您要做的是为表单创建一个Model,检查它的有效性,如果它无效,则将带有验证错误的模型返回给视图.
要向模型添加自定义错误,请使用:
ModelState.AddModelError("MyField", "Custom error message here");
并将其输出到视图,如:
@Html.ValidationMessage("MyField");