Reflection

Convert type from initial Value

Posted on by coder 
   
 

#region License
// Copyright 2006 James Newton-King
// http://www.newtonsoft.com
//
// This work is licensed under the Creative Commons Attribution 2.5 License
// http://creativecommons.org/licenses/by/2.5/
//
// You are free:
//    * to copy, distribute, display, and perform the work
//    * to make derivative works
//    * to make commercial use of the work
//
// Under the following conditions:
//    * You must attribute the work in the manner specified by the author or licensor:
//          - If you find this component useful a link to http://www.newtonsoft.com would be appreciated.
//    * For any reuse or distribution, you must make clear to others the license terms of this work.
//    * Any of these conditions can be waived if you get permission from the copyright holder.
#endregion

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.Collections;
using System.ComponentModel;

namespace MySpace.Common.IO.JSON.Utilities
{
    internal static class ReflectionUtils
    {
        public static T Convert<T>(object initialValue)
        {
            Type targetType = typeof(T);
            Type initialType = (initialValue != null) ? initialValue.GetType() : null;

            TypeConverter converter = TypeDescriptor.GetConverter(targetType);

            if (converter == null || !converter.CanConvertFrom(initialType))
                throw new ApplicationException(string.Format("Could not convert from {0} to {1}", initialType, targetType));

            return (T)converter.ConvertFrom(initialValue);
        }
    }
}

Is it a SubClass for another class

Posted on by coder 
   
 
#region License
// Copyright 2006 James Newton-King
// http://www.newtonsoft.com
//
// This work is licensed under the Creative Commons Attribution 2.5 License
// http://creativecommons.org/licenses/by/2.5/
//
// You are free:
//    * to copy, distribute, display, and perform the work
//    * to make derivative works
//    * to make commercial use of the work
//
// Under the following conditions:
//    * You must attribute the work in the manner specified by the author or licensor:
//          - If you find this component useful a link to http://www.newtonsoft.com would be appreciated.
//    * For any reuse or distribution, you must make clear to others the license terms of this work.
//    * Any of these conditions can be waived if you get permission from the copyright holder.
#endregion

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.Collections;
using System.ComponentModel;

namespace MySpace.Common.IO.JSON.Utilities
{
    internal static class ReflectionUtils
    {

        public static bool IsSubClass(Type type, Type check)
        {
            if (type == null || check == null)
                return false;

            if (type == check &amp;&amp; type.IsGenericType)
                return true;

            if (check.IsInterface)
            {
                foreach (Type t in type.GetInterfaces())
                {
                    if (IsSubClass(t, check)) return true;
                }
            }
            if (type.IsGenericType &amp;&amp; !type.IsGenericTypeDefinition)
            {
                if (IsSubClass(type.GetGenericTypeDefinition(), check))
                    return true;
            }
            return IsSubClass(type.BaseType, check);
        }

    }
}

Is Object Unitialized Value

Posted on by coder 
   
 
#region License
// Copyright 2006 James Newton-King
// http://www.newtonsoft.com
//
// This work is licensed under the Creative Commons Attribution 2.5 License
// http://creativecommons.org/licenses/by/2.5/
//
// You are free:
//    * to copy, distribute, display, and perform the work
//    * to make derivative works
//    * to make commercial use of the work
//
// Under the following conditions:
//    * You must attribute the work in the manner specified by the author or licensor:
//          - If you find this component useful a link to http://www.newtonsoft.com would be appreciated.
//    * For any reuse or distribution, you must make clear to others the license terms of this work.
//    * Any of these conditions can be waived if you get permission from the copyright holder.
#endregion

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.Collections;
using System.ComponentModel;

namespace MySpace.Common.IO.JSON.Utilities
{
    internal static class ReflectionUtils
    {
        private static bool IsValueTypeUnitializedValue(ValueType value, Type valueType)
        {
            if (valueType.IsGenericType &amp;&amp; valueType.GetGenericTypeDefinition() == typeof(Nullable<>))
                return (value == null);
            else
                return value.Equals((ValueType)Activator.CreateInstance(valueType));
        }
        public static bool IsObjectUnitializedValue(object value, Type valueType)
        {
            if (valueType.IsValueType)
                return IsValueTypeUnitializedValue((ValueType)value, valueType);
            else if (valueType.IsClass)
                return (value == null);
            else
                throw new ArgumentException("Type is neither a ValueType or a Class", "valueType");
        }
    }
}

Get Type Unitialized Value

Posted on by coder 
   
 
#region License
// Copyright 2006 James Newton-King
// http://www.newtonsoft.com
//
// This work is licensed under the Creative Commons Attribution 2.5 License
// http://creativecommons.org/licenses/by/2.5/
//
// You are free:
//    * to copy, distribute, display, and perform the work
//    * to make derivative works
//    * to make commercial use of the work
//
// Under the following conditions:
//    * You must attribute the work in the manner specified by the author or licensor:
//          - If you find this component useful a link to http://www.newtonsoft.com would be appreciated.
//    * For any reuse or distribution, you must make clear to others the license terms of this work.
//    * Any of these conditions can be waived if you get permission from the copyright holder.
#endregion

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.Collections;
using System.ComponentModel;

namespace MySpace.Common.IO.JSON.Utilities
{
    internal static class ReflectionUtils
    {

        public static object GetTypeUnitializedValue(Type type)
        {
            if (type.IsValueType)
                return Activator.CreateInstance(type);
            else if (type.IsClass)
                return null;
            else
                throw new ArgumentException("Type is neither a ValueType or a Class", "type");
        }
    }
}

Is Value Type Unitialized Value

Posted on by coder 
   
 
#region License
// Copyright 2006 James Newton-King
// http://www.newtonsoft.com
//
// This work is licensed under the Creative Commons Attribution 2.5 License
// http://creativecommons.org/licenses/by/2.5/
//
// You are free:
//    * to copy, distribute, display, and perform the work
//    * to make derivative works
//    * to make commercial use of the work
//
// Under the following conditions:
//    * You must attribute the work in the manner specified by the author or licensor:
//          - If you find this component useful a link to http://www.newtonsoft.com would be appreciated.
//    * For any reuse or distribution, you must make clear to others the license terms of this work.
//    * Any of these conditions can be waived if you get permission from the copyright holder.
#endregion

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.Collections;
using System.ComponentModel;

namespace MySpace.Common.IO.JSON.Utilities
{
    internal static class ReflectionUtils
    {

        private static bool IsValueTypeUnitializedValue(ValueType value, Type valueType)
        {
            if (valueType.IsGenericType &amp;&amp; valueType.GetGenericTypeDefinition() == typeof(Nullable<>))
                return (value == null);
            else
                return value.Equals((ValueType)Activator.CreateInstance(valueType));
        }
    }
}

Is it a Nullable Type

Posted on by coder 
   
 
#region License
// Copyright 2006 James Newton-King
// http://www.newtonsoft.com
//
// This work is licensed under the Creative Commons Attribution 2.5 License
// http://creativecommons.org/licenses/by/2.5/
//
// You are free:
//    * to copy, distribute, display, and perform the work
//    * to make derivative works
//    * to make commercial use of the work
//
// Under the following conditions:
//    * You must attribute the work in the manner specified by the author or licensor:
//          - If you find this component useful a link to http://www.newtonsoft.com would be appreciated.
//    * For any reuse or distribution, you must make clear to others the license terms of this work.
//    * Any of these conditions can be waived if you get permission from the copyright holder.
#endregion

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.Collections;
using System.ComponentModel;

namespace MySpace.Common.IO.JSON.Utilities
{
    internal static class ReflectionUtils
    {

        public static bool IsNullableType(Type underlyingType)
        {
            if (underlyingType.IsValueType)
            {
                if (!underlyingType.IsGenericType &amp;&amp; typeof(Nullable<>).IsAssignableFrom(underlyingType))
                    return false;
            }
            return true;
        }

    }
}

Does a given Type have a Default Constructor

Posted on by coder 
   
 

#region License
// Copyright 2006 James Newton-King
// http://www.newtonsoft.com
//
// This work is licensed under the Creative Commons Attribution 2.5 License
// http://creativecommons.org/licenses/by/2.5/
//
// You are free:
//    * to copy, distribute, display, and perform the work
//    * to make derivative works
//    * to make commercial use of the work
//
// Under the following conditions:
//    * You must attribute the work in the manner specified by the author or licensor:
//          - If you find this component useful a link to http://www.newtonsoft.com would be appreciated.
//    * For any reuse or distribution, you must make clear to others the license terms of this work.
//    * Any of these conditions can be waived if you get permission from the copyright holder.
#endregion

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.Collections;
using System.ComponentModel;

namespace MySpace.Common.IO.JSON.Utilities
{
    internal static class ReflectionUtils
    {
        public static bool HasDefaultConstructor(Type t)
        {
            if (t == null)
                throw new ArgumentNullException("t");

            return (t.GetConstructor(BindingFlags.Public | BindingFlags.Instance, null, new Type[0], null) != null);
        }



    }
}