c# - 带有 ASP.NET MVC 3 的 CSVHelper

我正在尝试上传一个 csv 文件并使用 MVC3 实现 CSVHelper 主管。

https://github.com/JoshClose/CsvHelper

我还没有找到将它用于文件上传的示例。基本上，我需要获取 CSV 文件并映射到实体对象并保存到数据库。这是我的实体:

public class SurveyEmailListModels
    {
        [Key]
        public int SurveyEmailListId { get; set; }

        [CsvField(Index = 0)]
        public int ProgramId { get; set; }

        [CsvField(Index = 1)]
        public virtual SurveyProgramModels SurveyProgramModels { get; set; }

        [CsvField(Index = 2)]
        public string SurveyEmailAddress { get; set; }

        [CsvField(Index = 3)]
        public bool SurveyResponded { get; set; }

    }

上传处理程序:

 [HttpPost]
        public ActionResult Upload(HttpPostedFileBase file, SurveyEmailListModels surveyemaillistmodels, int id)
        {
            if (file != null && file.ContentLength > 0)
            {


                // Collect file and place into directory for source file download

                var appData = Server.MapPath("~/csv/");
                var filename = Path.Combine(appData, Path.GetFileName(file.FileName));
                file.SaveAs(filename);



             //   surveyemaillistmodels.SurveyEmailAddress = "[email protected]";
             //   surveyemaillistmodels.SurveyResponded = true;
              //  surveyemaillistmodels.ProgramId = id;


                db.SurveyEmailListModels.Add(surveyemaillistmodels);
                db.SaveChanges();

                return Content(filename);

            }
            return Json(true);
        }

我不确定如何遍历 CSV 文件并保存到数据库。有人有例子吗？

最佳答案

我建议您为此使用自定义模型绑定(bind)器，以避免使用 CSV 解析代码混淆您的 Controller 逻辑:

public class SurveyEmailListModelsModelBinder: DefaultModelBinder
{
    public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        var csv = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
        var file = ((csv.RawValue as HttpPostedFileBase[]) ?? Enumerable.Empty<HttpPostedFileBase>()).FirstOrDefault();

        if (file == null || file.ContentLength < 1)
        {
            bindingContext.ModelState.AddModelError(
                "",
                "Please select a valid CSV file"
            );
            return null;
        }

        using (var reader = new StreamReader(file.InputStream))
        using (var csvReader = new CsvReader(reader))
        {
            return csvReader.GetRecords<SurveyEmailListModels>().ToArray();
        }
    }
}

将在 Application_Start 中注册:

ModelBinders.Binders.Add(
    typeof(SurveyEmailListModels[]),
    new SurveyEmailListModelsModelBinder()
);

现在我们可以有一个 Controller :

public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View();
    }

    [HttpPost]
    public ActionResult Index(SurveyEmailListModels[] model)
    {
        if (!ModelState.IsValid)
        {
            return View();
        }

        ... store the model into the database

        return Content("Thanks for uploading");
    }
}

和一个观点:

@Html.ValidationSummary()
@using (Html.BeginForm(null, null, FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <input type="file" name="model" />
    <button type="submit">OK</button>
}

关于c# - 带有 ASP.NET MVC 3 的 CSVHelper，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/11076587/