TypeHelper.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / Linq / TypeHelper.cs / 1305376 / TypeHelper.cs
                        

                        
                            using System; 
using System.Collections.Generic;
using System.Text;

namespace System.Linq { 
    internal static class TypeHelper {
        internal static bool IsEnumerableType(Type enumerableType) { 
            return FindGenericType(typeof(IEnumerable<>), enumerableType) != null; 
        }
        internal static bool IsKindOfGeneric(Type type, Type definition) { 
            return FindGenericType(definition, type) != null;
        }
        internal static Type GetElementType(Type enumerableType) {
            Type ienumType = FindGenericType(typeof(IEnumerable<>), enumerableType); 
            if (ienumType != null)
                return ienumType.GetGenericArguments()[0]; 
            return enumerableType; 
        }
        internal static Type FindGenericType(Type definition, Type type) { 
            while (type != null && type != typeof(object)) {
                if (type.IsGenericType && type.GetGenericTypeDefinition() == definition)
                    return type;
                if (definition.IsInterface) { 
                    foreach(Type itype in type.GetInterfaces()) {
                        Type found = FindGenericType(definition, itype); 
                        if (found != null) 
                            return found;
                    } 
                }
                type = type.BaseType;
            }
            return null; 
        }
        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.
using System; 
using System.Collections.Generic;
using System.Text;

namespace System.Linq { 
    internal static class TypeHelper {
        internal static bool IsEnumerableType(Type enumerableType) { 
            return FindGenericType(typeof(IEnumerable<>), enumerableType) != null; 
        }
        internal static bool IsKindOfGeneric(Type type, Type definition) { 
            return FindGenericType(definition, type) != null;
        }
        internal static Type GetElementType(Type enumerableType) {
            Type ienumType = FindGenericType(typeof(IEnumerable<>), enumerableType); 
            if (ienumType != null)
                return ienumType.GetGenericArguments()[0]; 
            return enumerableType; 
        }
        internal static Type FindGenericType(Type definition, Type type) { 
            while (type != null && type != typeof(object)) {
                if (type.IsGenericType && type.GetGenericTypeDefinition() == definition)
                    return type;
                if (definition.IsInterface) { 
                    foreach(Type itype in type.GetInterfaces()) {
                        Type found = FindGenericType(definition, itype); 
                        if (found != null) 
                            return found;
                    } 
                }
                type = type.BaseType;
            }
            return null; 
        }
        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.

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