从 Windows 窗体调用 .NET core REST api 以发送包括 IFormFile 在内的数据答案

【问题标题】：Calling .NET core REST api from windows forms to send data including IFormFile从 Windows 窗体调用 .NET core REST api 以发送包括 IFormFile 在内的数据
【发布时间】：2019-03-15 06:10:06
【问题描述】：

我有一个使用此模型的 .NET 核心 Web Api：

public class UserForRegisterDto
{
    [Required]
    public string UserName { get; set; }
    [Required]
    public string Name { get; set; }
    [Required]
    public string LastName { get; set; }
    [Required]      
    public string Password { get; set; }
    [Required]
    public string PhoneNumber { get; set; }
    [Required]
    public string MobilePhone { get; set; }

    [Required]
    public IFormFile Photo { get; set; }
}

另一方面，我有一个使用 .NET 4 的 windows 窗体应用程序，我尝试使用此类和一段代码将数据发送到 api：

public class UserForRegisterDto
{
    public string UserName { get; set; }
    public string Name { get; set; }
    public string LastName { get; set; }
    public string Password { get; set; }
    public string PhoneNumber { get; set; }
    public string MobilePhone { get; set; }
    public byte[] Photo { get; set; }
}

发送此数据的代码是：

List<UserForRegisterDto> registrationList = Mapper.Map<List<UserForRegisterDto>>(usersList);
AuthenticatedHttpClientHandler clientHandler = new AuthenticatedHttpClientHandler(user.Id, Uow, _refreshTokenService);
clientHandler.UseDefaultCredentials = true;
HttpClient client = new HttpClient(clientHandler);
client.BaseAddress = new Uri(ConfigurationManager.AppSettings["appUrl"].ToString());
StringContent content = new StringContent(JsonConvert.SerializeObject(registrationList), Encoding.UTF8, "application/json");


HttpResponseMessage response = await client.PostAsync($"api/users/{user.Id}/users/PostGasStationUsers/{ConfigurationManager.AppSettings["appId"].ToString()}", content);

我需要使用另一种数据类型而不是可以映射到 IFormFile 数据的字节数组以及如何做到这一点。

【问题讨论】：

标签： c# asp.net-core

【解决方案1】：

使用MultipartFormDataContent传输二进制数据

var content = new MultipartFormDataContent();

for (int i = 0; i < registrationList.Count; i++)
{
    UserForRegisterDto registration = registrationList[i];

    content.Add(new StringContent(registration.LastName), $"model[{i}].LastName");
    content.Add(new StringContent(registration.MobilePhone), $"model[{i}].MobilePhone");
    content.Add(new StringContent(registration.Name), $"model[{i}].Name");
    content.Add(new StringContent(registration.Password), $"model[{i}].Password");
    content.Add(new StringContent(registration.PhoneNumber), $"model[{i}].PhoneNumber");
    content.Add(new StringContent(registration.UserName), $"model[{i}].UserName");
    content.Add(new ByteArrayContent(registration.Photo), $"model[{i}].Photo", "photo.jpeg");
}

HttpResponseMessage response = await client.PostAsync($"api/users/{user.Id}/users/PostGasStationUsers/{ConfigurationManager.AppSettings["appId"].ToString()}", content);

动作参数名称为model时有效

[HttpPost]
public IActionResult PostGasStationUsers(List<UserForRegisterDto> model)

【讨论】：