WebAPI上传文件

Posted 2020-06-17

#region 上传文件
/// <summary>
/// 通过multipart/form-data方式上传文件
/// </summary>
/// <returns></returns>
[HttpPost]
public async Task<HttpResponseMessage> PostFile()
{
MessagesDataCodeModel json = new MessagesDataCodeModel(false, "无效参数", 401);

try
{
// 是否请求包含multipart/form-data。
if (!Request.Content.IsMimeMultipartContent())
{
logger.Error("上传格式不是multipart/form-data");
throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
}

string root = HttpContext.Current.Server.MapPath("/UploadFiles/");
if (!Directory.Exists(HttpContext.Current.Server.MapPath("~/UploadFiles/")))
{
Directory.CreateDirectory(HttpContext.Current.Server.MapPath("~/UploadFiles/"));
}

var provider = new MultipartFormDataStreamProvider(root);

StringBuilder sb = new StringBuilder(); // Holds the response body

// 阅读表格数据并返回一个异步任务.
await Request.Content.ReadAsMultipartAsync(provider);

// 如何上传文件到文件名.
foreach (var file in provider.FileData)
{
string orfilename = file.Headers.ContentDisposition.FileName.TrimStart(‘"‘).TrimEnd(‘"‘);
FileInfo fileinfo = new FileInfo(file.LocalFileName);
//sb.Append(string.Format("Uploaded file: {0} ({1} bytes)\n", fileInfo.Name, fileInfo.Length));
//最大文件大小
//int maxSize = Convert.ToInt32(SettingConfig.MaxSize);
if (fileinfo.Length <= 0)
{
json.Success = false;
json.Msg = "请选择上传文件";
json.Code = 301;
}
else if (fileinfo.Length > ConfigHelper.MaxFileSize)
{
json.Msg = "上传文件大小超过限制";
json.Code = 302;
}
else
{
string fileExt = orfilename.Substring(orfilename.LastIndexOf(‘.‘));
//定义允许上传的文件扩展名
//String fileTypes = SettingConfig.FileTypes;
//if (String.IsNullOrEmpty(fileExt) || Array.IndexOf(fileTypes.Split(‘,‘), fileExt.Substring(1).ToLower()) == -1)
//{
// json.Msg = "图片类型不正确";
// json.Code = 303;
//}
//else
//{
//String ymd = DateTime.Now.ToString("yyyyMMdd", System.Globalization.DateTimeFormatInfo.InvariantInfo);
//String newFileName = DateTime.Now.ToString("yyyyMMddHHmmss_ffff", System.Globalization.DateTimeFormatInfo.InvariantInfo);

fileinfo.CopyTo(Path.Combine(root, fileinfo.Name + fileExt), true);
json.Success = true;
json.Msg = "操作成功";
json.Code = 200;
sb.Append("/UploadFiles/" + fileinfo.Name + fileExt);
json.Data = sb.ToString();
//}
}
fileinfo.Delete();//删除原文件
}
}
catch (System.Exception e)
{
json.Success = false;
json.Msg = "服务器无响应";
json.Code = 500;
logger.Error("PostFile()服务器错误", e);
}
return ToJsonTran.ToJson(json);
}
#endregion 上传文件