新增下载当前测算表的接口

performance/Performance.Api/Controllers/AllotController.cs

 using FluentValidation.AspNetCore;
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Internal;
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.StaticFiles;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using Performance.DtoModels;
@@ -16,6 +18,7 @@
 using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
+using System.Web;
 
 // For more information on enabling Web API for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860
 
@@ -500,5 +503,30 @@ public ApiResponse Reserved([FromBody] ReservedRequest request)
 
             return new ApiResponse(ResponseType.OK, result);
         }
+
+        /// <summary>
+        /// 下载当前测算表
+        /// </summary>
+        /// <returns></returns>
+        [Route("download")]
+        [HttpPost]
+        [AllowAnonymous]
+        public IActionResult DownloadCurrentCalculationTable([FromBody] AllotRequest request)
+        {
+            var allot = _allotService.GetAllot(request.ID);
+            if (null == allot)
+                throw new PerformanceException("当前测算表不存在");
+
+            var memoryStream = new MemoryStream();
+            using (var stream = new FileStream(allot.Path, FileMode.Open))
+            {
+                stream.CopyToAsync(memoryStream).Wait();
+            }
+            memoryStream.Seek(0, SeekOrigin.Begin);
+            var provider = new FileExtensionContentTypeProvider();
+            FileInfo fileInfo = new FileInfo(allot.Path);
+            var memi = provider.Mappings[".xlsx"];
+            return File(memoryStream, memi, Path.GetFileName(fileInfo.Name));
+        }
     }
 }