TypeSystem.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / ndp / fx / src / DataEntity / System / Data / Objects / ELinq / TypeSystem.cs / 1 / TypeSystem.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....]
//--------------------------------------------------------------------- 
 
using System.Collections.Generic;
using System.Reflection; 
using System.Data.Entity;
namespace System.Data.Objects.ELinq
{
    ///  
    /// Static utility class. Replica of query\DLinq\TypeSystem.cs
    ///  
    internal static class TypeSystem 
    {
        private static readonly MethodInfo s_getDefaultMethod = typeof(TypeSystem).GetMethod( 
            "GetDefault", BindingFlags.Static | BindingFlags.NonPublic);
        private static T GetDefault() { return default(T); }
        internal static object GetDefaultValue(Type type)
        { 
            // null is always the default for non value types and Nullable<>
            if (!type.IsValueType || 
                (type.IsGenericType && 
                 typeof(Nullable<>) == type.GetGenericTypeDefinition()))
            { 
                return null;
            }
            MethodInfo getDefaultMethod = s_getDefaultMethod.MakeGenericMethod(type);
            object defaultValue = getDefaultMethod.Invoke(null, new object[] { }); 
            return defaultValue;
        } 
 
        internal static bool IsSequenceType(Type seqType)
        { 
            return FindIEnumerable(seqType) != null;
        }

        ///  
        /// Resolves MemberInfo to a property or field.
        ///  
        /// Member to test. 
        /// Name of member.
        /// Type of member. 
        /// Given member normalized as a property or field.
        internal static MemberInfo PropertyOrField(MemberInfo member, out string name, out Type type)
        {
            name = null; 
            type = null;
 
            if (member.MemberType == MemberTypes.Field) 
            {
                FieldInfo field = (FieldInfo)member; 
                name = field.Name;
                type = field.FieldType;
                return field;
            } 
            else if (member.MemberType == MemberTypes.Property)
            { 
                PropertyInfo property = (PropertyInfo)member; 
                if (0 != property.GetIndexParameters().Length)
                { 
                    // don't support indexed properties
                    throw EntityUtil.NotSupported(System.Data.Entity.Strings.ELinq_PropertyIndexNotSupported);
                }
                name = property.Name; 
                type = property.PropertyType;
                return property; 
            } 
            else if (member.MemberType == MemberTypes.Method)
            { 
                // this may be a property accessor in disguise (if it's a RuntimeMethodHandle)
                MethodInfo method = (MethodInfo)member;
                if (method.IsSpecialName) // property accessor methods must set IsSpecialName
                { 
                    // try to find a property with the given getter
                    foreach (PropertyInfo property in method.DeclaringType.GetProperties( 
                        BindingFlags.Static | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)) 
                    {
                        if (property.CanRead && (property.GetGetMethod(true) == method)) 
                        {
                            return PropertyOrField(property, out name, out type);
                        }
                    } 
                }
            } 
            throw EntityUtil.NotSupported(System.Data.Entity.Strings.ELinq_NotPropertyOrField(member.Name)); 
        }
 
        private static Type FindIEnumerable(Type seqType)
        {
            // Ignores "terminal" primitive types in the EDM although they may implement IEnumerable<>
            if (seqType == null || seqType == typeof(string) || seqType == typeof(byte[])) 
                return null;
            if (seqType.IsArray) 
                return typeof(IEnumerable<>).MakeGenericType(seqType.GetElementType()); 
            if (seqType.IsGenericType)
            { 
                foreach (Type arg in seqType.GetGenericArguments())
                {
                    Type ienum = typeof(IEnumerable<>).MakeGenericType(arg);
                    if (ienum.IsAssignableFrom(seqType)) 
                    {
                        return ienum; 
                    } 
                }
            } 
            Type[] ifaces = seqType.GetInterfaces();
            if (ifaces != null && ifaces.Length > 0)
            {
                foreach (Type iface in ifaces) 
                {
                    Type ienum = FindIEnumerable(iface); 
                    if (ienum != null) return ienum; 
                }
            } 
            if (seqType.BaseType != null && seqType.BaseType != typeof(object))
            {
                return FindIEnumerable(seqType.BaseType);
            } 
            return null;
        } 
        internal static Type GetElementType(Type seqType) 
        {
            Type ienum = FindIEnumerable(seqType); 
            if (ienum == null) return seqType;
            return ienum.GetGenericArguments()[0];
        }
        internal static bool IsNullableType(Type type) 
        {
            return type != null && type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>); 
        } 
        internal static Type GetNonNullableType(Type type)
        { 
            if (IsNullableType(type))
            {
                return type.GetGenericArguments()[0];
            } 
            return type;
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....]
//--------------------------------------------------------------------- 
 
using System.Collections.Generic;
using System.Reflection; 
using System.Data.Entity;
namespace System.Data.Objects.ELinq
{
    ///  
    /// Static utility class. Replica of query\DLinq\TypeSystem.cs
    ///  
    internal static class TypeSystem 
    {
        private static readonly MethodInfo s_getDefaultMethod = typeof(TypeSystem).GetMethod( 
            "GetDefault", BindingFlags.Static | BindingFlags.NonPublic);
        private static T GetDefault() { return default(T); }
        internal static object GetDefaultValue(Type type)
        { 
            // null is always the default for non value types and Nullable<>
            if (!type.IsValueType || 
                (type.IsGenericType && 
                 typeof(Nullable<>) == type.GetGenericTypeDefinition()))
            { 
                return null;
            }
            MethodInfo getDefaultMethod = s_getDefaultMethod.MakeGenericMethod(type);
            object defaultValue = getDefaultMethod.Invoke(null, new object[] { }); 
            return defaultValue;
        } 
 
        internal static bool IsSequenceType(Type seqType)
        { 
            return FindIEnumerable(seqType) != null;
        }

        ///  
        /// Resolves MemberInfo to a property or field.
        ///  
        /// Member to test. 
        /// Name of member.
        /// Type of member. 
        /// Given member normalized as a property or field.
        internal static MemberInfo PropertyOrField(MemberInfo member, out string name, out Type type)
        {
            name = null; 
            type = null;
 
            if (member.MemberType == MemberTypes.Field) 
            {
                FieldInfo field = (FieldInfo)member; 
                name = field.Name;
                type = field.FieldType;
                return field;
            } 
            else if (member.MemberType == MemberTypes.Property)
            { 
                PropertyInfo property = (PropertyInfo)member; 
                if (0 != property.GetIndexParameters().Length)
                { 
                    // don't support indexed properties
                    throw EntityUtil.NotSupported(System.Data.Entity.Strings.ELinq_PropertyIndexNotSupported);
                }
                name = property.Name; 
                type = property.PropertyType;
                return property; 
            } 
            else if (member.MemberType == MemberTypes.Method)
            { 
                // this may be a property accessor in disguise (if it's a RuntimeMethodHandle)
                MethodInfo method = (MethodInfo)member;
                if (method.IsSpecialName) // property accessor methods must set IsSpecialName
                { 
                    // try to find a property with the given getter
                    foreach (PropertyInfo property in method.DeclaringType.GetProperties( 
                        BindingFlags.Static | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)) 
                    {
                        if (property.CanRead && (property.GetGetMethod(true) == method)) 
                        {
                            return PropertyOrField(property, out name, out type);
                        }
                    } 
                }
            } 
            throw EntityUtil.NotSupported(System.Data.Entity.Strings.ELinq_NotPropertyOrField(member.Name)); 
        }
 
        private static Type FindIEnumerable(Type seqType)
        {
            // Ignores "terminal" primitive types in the EDM although they may implement IEnumerable<>
            if (seqType == null || seqType == typeof(string) || seqType == typeof(byte[])) 
                return null;
            if (seqType.IsArray) 
                return typeof(IEnumerable<>).MakeGenericType(seqType.GetElementType()); 
            if (seqType.IsGenericType)
            { 
                foreach (Type arg in seqType.GetGenericArguments())
                {
                    Type ienum = typeof(IEnumerable<>).MakeGenericType(arg);
                    if (ienum.IsAssignableFrom(seqType)) 
                    {
                        return ienum; 
                    } 
                }
            } 
            Type[] ifaces = seqType.GetInterfaces();
            if (ifaces != null && ifaces.Length > 0)
            {
                foreach (Type iface in ifaces) 
                {
                    Type ienum = FindIEnumerable(iface); 
                    if (ienum != null) return ienum; 
                }
            } 
            if (seqType.BaseType != null && seqType.BaseType != typeof(object))
            {
                return FindIEnumerable(seqType.BaseType);
            } 
            return null;
        } 
        internal static Type GetElementType(Type seqType) 
        {
            Type ienum = FindIEnumerable(seqType); 
            if (ienum == null) return seqType;
            return ienum.GetGenericArguments()[0];
        }
        internal static bool IsNullableType(Type type) 
        {
            return type != null && type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>); 
        } 
        internal static Type GetNonNullableType(Type type)
        { 
            if (IsNullableType(type))
            {
                return type.GetGenericArguments()[0];
            } 
            return type;
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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