C#通用类型转换 Convert.ChangeType

http://technet.microsoft.com/zh-cn/library/system.convert.changetype(en-us).aspx

static public object ChangeType(object value, Type type)

{

    if (value == null && type.IsGenericType) return Activator.CreateInstance(type);

    if (value == null) return null;

    if (type == value.GetType()) return value;

    if (type.IsEnum)

    {

if (value is string)

    return Enum.Parse(type, value as string);

else

    return Enum.ToObject(type, value);

    }

    if (!type.IsInterface && type.IsGenericType)

    {

Type innerType = type.GetGenericArguments()[0];

object innerValue = ChangeType(value, innerType);

return Activator.CreateInstance(type, new object[] { innerValue });

    }

    if (value is string && type == typeof(Guid)) return new Guid(value as string);

    if (value is string && type == typeof(Version)) return new Version(value as string);

    if (!(value is IConvertible)) return value;

    return Convert.ChangeType(value, type);

}

http://www.cnblogs.com/youring2/archive/2012/07/26/2610035.html

Example: