一直都是个头疼的问题，感谢

1.

public object ChangeType(object value, Type conversionType){    if ( conversionType.IsGenericType &&        conversionType.GetGenericTypeDefinition( ).Equals( typeof( Nullable<> ) ) ) {         if(value == null)            return null;         System.ComponentModel.NullableConverter nullableConverter            = new System.ComponentModel.NullableConverter(conversionType);         conversionType = nullableConverter.UnderlyingType;    }     return Convert.ChangeType(value, conversionType);}

引用：

public class DataTypeConverter    {        public static object ChangeType(Type type,object value)        {            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);                }                return Enum.ToObject(type, value);            }            if (!type.IsInterface && type.IsGenericType)            {                Type type1 = type.GetGenericArguments()[0];                object obj1 = DataTypeConverter.ChangeType(type1,value);                return Activator.CreateInstance(type, new object[] { obj1 });            }            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);        }    }

引用：