Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data/System/Data/SqlClient/SqlUdtInfo.cs

@@ -0,0 +1,76 @@
+//------------------------------------------------------------------------------
+//  <copyright file="SqlUdtInfo.cs" company="Microsoft Corporation">
+//     Copyright (c) Microsoft Corporation. All Rights Reserved.
+//     Information Contained Herein is Proprietary and Confidential.
+//  </copyright>
+// <owner current="true" primary="true">[....]</owner>
+// <owner current="true" primary="false">[....]</owner>
+//------------------------------------------------------------------------------
+
+namespace System.Data.SqlClient {
+
+    using System;
+    using System.Collections;
+    using System.Collections.Generic;
+    using System.Data.Common;
+    using System.Data.Sql;
+    using System.Data.SqlTypes;
+    using System.Diagnostics;
+    using System.Text;
+    using System.IO;
+    using System.Reflection;
+    using System.Runtime.InteropServices;
+    using System.Runtime.Serialization;
+    using System.Runtime.Serialization.Formatters.Binary;
+    using System.Reflection.Emit;
+    using System.Security.Permissions;
+
+    using Microsoft.SqlServer.Server;
+
+    internal class SqlUdtInfo {
+        internal readonly Microsoft.SqlServer.Server.Format SerializationFormat;
+        internal readonly bool IsByteOrdered;
+        internal readonly bool IsFixedLength;
+        internal readonly int MaxByteSize;
+        internal readonly string Name;
+        internal readonly string ValidationMethodName;
+
+        private SqlUdtInfo(Microsoft.SqlServer.Server.SqlUserDefinedTypeAttribute attr) {
+            SerializationFormat = (Microsoft.SqlServer.Server.Format)attr.Format;
+            IsByteOrdered       = attr.IsByteOrdered;
+            IsFixedLength       = attr.IsFixedLength;
+            MaxByteSize         = attr.MaxByteSize;
+            Name                = attr.Name;
+            ValidationMethodName= attr.ValidationMethodName;
+        }
+        internal static SqlUdtInfo GetFromType(Type target) {
+            SqlUdtInfo udtAttr = TryGetFromType(target);
+            if (udtAttr == null) {
+                throw InvalidUdtException.Create(target, Res.SqlUdtReason_NoUdtAttribute);
+            }
+            return udtAttr;
+        }
+
+        // VSTFDEVDIV 479671: Type.GetCustomAttributes is an time-expensive call.
+        // Improve UDT serialization performance by caching the resulted UDT type information using type-safe dictionary.
+        // Use a per-thread cache, so we do not need to synchronize access to it
+        [ThreadStatic]
+        private static Dictionary<Type, SqlUdtInfo> m_types2UdtInfo;
+
+        internal static SqlUdtInfo TryGetFromType(Type target) {
+            if (m_types2UdtInfo == null)
+                m_types2UdtInfo = new Dictionary<Type, SqlUdtInfo>();
+
+            SqlUdtInfo udtAttr = null;
+            if (!m_types2UdtInfo.TryGetValue(target, out udtAttr)) {
+                // query SqlUserDefinedTypeAttribute first time and cache the result
+                object[] attr = target.GetCustomAttributes(typeof(Microsoft.SqlServer.Server.SqlUserDefinedTypeAttribute), false);
+                if (attr != null && attr.Length == 1) {
+                    udtAttr = new SqlUdtInfo((Microsoft.SqlServer.Server.SqlUserDefinedTypeAttribute)attr[0]);
+                }
+                m_types2UdtInfo.Add(target, udtAttr);
+            }
+            return udtAttr;
+        }
+    }
+}