使用 .NET Core MVC 3.0 将 .CSV 插入 AspNetUsers

Question

所以基本上我正在尝试从客户端获取上传的 .csv 文件并将其插入 Dbo.AspNetUsers。我已经为从 .csv

获得的三个字段定义了以下文件

public class CsvStudent : IdentityUser
    {
        public string Name { get; set; }
        public int Number { get; set; }
        public string Course { get; set; }
    }

下面是从客户端上传 .csv 的代码。

<form class="col-xs-12" method="post" asp-controller="User" asp-action="ImportUsers" enctype="multipart/form-data">

    <div class="form-group">
        <input type="file" class="form-control" name="file" />
    </div>

    <div class="form-group">
        <button type="submit" class="btn btn-primary col-xs-12">Add</button>
    </div>
</form>

这是到目前为止应该获取上传的 .csv 的控制器。

public async Task<IActionResult> ImportUsers(IFormFile file)
        {
            var data = new MemoryStream();
            file.CopyTo(data);
            TextReader reader = new StreamReader(data);
            var csvReader = new CsvReader(reader);
            var records = csvReader.GetRecords<User>();

我什至不确定上面的代码是否正确读取 .csv，但基本上我想在这里做的，正如我在第一段中解释的那样，是将记录上传到 dbo.AspNetUsers table，我不确定该怎么做。提前致谢！

Answer 1

您可以参考下面的demo：

1.Model 和 ApplicationDbContext:

public class CsvStudent : IdentityUser
{
    public string Name { get; set; }
    public int Number { get; set; }
    public string Course { get; set; }
    [NotMapped]
    public string Password { get; set; }
}
public class ApplicationDbContext : IdentityDbContext<CsvStudent>
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }

}

2.CSV 文件：

Name,Number,Course,Password
Sherry,6,Chinese,Sherry123#
Daniel,2,Math,Daniel456#

3.Controller :

public async Task<IActionResult> ImportUsers(IFormFile file)
    {
        var data = new MemoryStream();
        await file.CopyToAsync(data);
        data.Position = 0;
        TextReader reader = new StreamReader(data);
        var csvReader = new CsvReader(reader ,new CsvHelper.Configuration.Configuration
        {
            HasHeaderRecord = true, //Gets or sets a value indicating if the CSV file has a header record. Default is true.
            HeaderValidated = null,//Gets or sets the function that is called when a header validation check is ran
            MissingFieldFound=null //Gets or sets the function that is called when a missing field is found.
        });
        var records = csvReader.GetRecords<CsvStudent>().ToList();
        foreach (var item in records)
        {
           //check if the user has been existing in db 
            var user = await _userManager.FindByNameAsync(item.Name);

            if (user == null)
            {
                user = new CsvStudent
                {
                    Name = item.Name,
                    Number = item.Number,
                    Course = item.Course,
                    UserName = item.Name
                };
                await _userManager.CreateAsync(user, item.Password);
            }
        }
         return Json(records);
    }

更多关于CsvHelper.Configuration的细节，你可以参考here。

使用 .NET Core MVC 3.0 将 .CSV 插入 AspNetUsers

Insert .CSV into AspNetUsers using .NET Core MVC 3.0

.net

c#

asp.net-mvc

asp.net-identity

asp.net-core