SqlUdtInfo.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / SqlClient / SqlUdtInfo.cs / 1305376 / SqlUdtInfo.cs
                        

                        
                            //------------------------------------------------------------------------------ 
//  
//     Copyright (c) Microsoft Corporation. All Rights Reserved.
//     Information Contained Herein is Proprietary and Confidential.
//   
// [....]
// [....] 
//----------------------------------------------------------------------------- 

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 m_types2UdtInfo;
 
        internal static SqlUdtInfo TryGetFromType(Type target) {
            if (m_types2UdtInfo == null) 
                m_types2UdtInfo = new Dictionary(); 

            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; 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK