打印采用 MemoryCache 替代原有 Web 缓存，，提升兼容性与性能。报表数据与参数缓存方式由 Session 直接存储对象改为存储缓存键，实际数据存入 MemoryCache，避免 Session 大对象。

HJGL_DS/BLL/Common/FastReportService.cs

@@ -1,40 +1,85 @@
-using System.Web;
-using System.Web.Security;
+using FastReport;
+using NPOI.POIFS.Crypt;
+using System;
 using System.Collections.Generic;
+using System.Data;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
-using System.Data;
-using FastReport;
+using System.Web;
+using System.Web.Security;
 
 namespace BLL.Common
 {
     public static class FastReportService
     {
- 
+        // 缓存过期时间：30分钟
+        private static readonly int CacheExpirationMinutes = 5;
+
         /// <summary>
-        /// 重置数据
+        /// 重置数据 - 清理缓存和Session
         /// </summary>
         public static void ResetData()
         {
-            HttpContext.Current.Session["ReportDataTables"] = null;
-            HttpContext.Current.Session["ReportParameterValues"] = null;
+            if (HttpContext.Current?.Session == null)
+            {
+                return;
+            }
+
+            // 清理Session中的缓存键引用
+            var cacheKeys = HttpContext.Current.Session["ReportDataCacheKeys"] as List<string>;
+            if (cacheKeys != null)
+            {
+                foreach (var key in cacheKeys)
+                {
+                    try
+                    {
+                        CacheHelper.Remove(key);
+                    }
+                    catch
+                    {
+                        // 忽略缓存删除异常
+                    }
+                }
+            }
+            HttpContext.Current.Session["ReportDataCacheKeys"] = null;
+            HttpContext.Current.Session["ReportParameterCacheKey"] = null;
         }
+
+        /// <summary>
+        /// 添加报表数据表到缓存
+        /// </summary>
         public static void AddFastreportTable(DataTable dataTable)
         {
-            List<DataTable> dataTables = (List<DataTable>)HttpContext.Current.Session["ReportDataTables"];
-            if (dataTables == null)
+
+            // 生成唯一缓存键
+            string cacheKey = $"ReportData_{Guid.NewGuid()}_{DateTime.Now.Ticks}";
+
+            // 将数据表存储到缓存中，设置5分钟过期
+            CacheHelper.Add(cacheKey, dataTable, DateTimeOffset.Now.AddMinutes(CacheExpirationMinutes));
+
+            List<string> cacheKeys = HttpContext.Current.Session["ReportDataCacheKeys"] as List<string>;
+            if (cacheKeys==null)
             {
-                dataTables = new List<DataTable>();
+                cacheKeys = new List<string>();
             }
-            dataTables.Add(dataTable);
-
-            HttpContext.Current.Session["ReportDataTables"] = dataTables;
+            cacheKeys.Add(cacheKey);
+            HttpContext.Current.Session["ReportDataCacheKeys"] = cacheKeys; 
         }
-        public static void AddFastreportParameter(Dictionary<string, string> Dicparames)
-        {
-            HttpContext.Current.Session["ReportParameterValues"] = Dicparames;
 
+        /// <summary>
+        /// 添加报表参数到缓存
+        /// </summary>
+        public static void AddFastreportParameter(Dictionary<string, string> Dicparames)
+        {  
+            // 生成唯一缓存键
+            string cacheKey = $"ReportParam_{Guid.NewGuid()}_{DateTime.Now.Ticks}";
+
+            // 将参数存储到缓存中，设置5分钟过期
+            CacheHelper.Add(cacheKey, Dicparames, DateTimeOffset.Now.AddMinutes(CacheExpirationMinutes));
+
+            // Session只存储缓存键的引用（轻量级）
+            HttpContext.Current.Session["ReportParameterCacheKey"] = cacheKey;
         }
 
         /// <summary>
@@ -82,16 +127,8 @@ namespace BLL.Common
 
                 }
             }
-            if (printType == "1")
-            {
-                FastReport.Export.Pdf.PDFExport exp = new FastReport.Export.Pdf.PDFExport();
-                report.Export(exp, path);
-            }
-            else if (printType == "2")
-            {
-                FastReport.Export.OoXML.Word2007Export exportBase = new FastReport.Export.OoXML.Word2007Export();
-                report.Export(export: exportBase, fileName: path.Replace(oldValue: "pdf", newValue: "docx"));
-            }
+            FastReport.Export.Pdf.PDFExport exp = new FastReport.Export.Pdf.PDFExport();
+            report.Export(exp, path);
         }
     }
 }