Boolean TryWrite(Object target, DME_BinaryWriter writer, DME_MemberInfo member, Boolean encodeInt, Boolean allowNull)
{
Object value = member.GetValue(target);
// 基本类型
if (writer.WriteValue(value, encodeInt)) return true;
// 允许空时，增加一个字节表示对象是否为空
if (value == null)
{
if (allowNull) writer.Write((Byte)0);
return true;
}
if (allowNull) writer.Write((Byte)1);
// 接口支持
//if (Array.IndexOf(member.Type.GetInterfaces(), typeof(IBinaryAccessor)) >= 0)
if (typeof(DME_IBinaryAccessor).IsAssignableFrom(member.Type))
{
// 调用接口
DME_IBinaryAccessor accessor = value as DME_IBinaryAccessor;
accessor.Write(writer);
return true;
}
#region 数组
if (member.Type.IsArray)
{
// 特殊处理字节数组
if (member.Type == typeof(Byte[]))
{
writer.Write((Byte[])value);
return true;
}
Array arr = value as Array;
if (arr != null)
{
}
}
#endregion
#region 枚举
if (typeof(IEnumerable).IsAssignableFrom(member.Type))
{
// 先写元素个数
IEnumerable arr = value as IEnumerable;
Int32 count = 0;
foreach (Object item in arr)
{
count++;
}
// 写入长度
writer.WriteEncoded(count);
foreach (Object item in arr)
{
// 允许空时，增加一个字节表示对象是否为空
if (item == null)
{
if (allowNull) writer.Write((Byte)0);
continue;
}
if (allowNull) writer.Write((Byte)1);
if (!writer.WriteValue(item, encodeInt))
Write(item, writer, encodeInt, allowNull, member.Member.MemberType == MemberTypes.Property);
}
return true;
}
#endregion
return false;
}
/// <summary>
/// 把对象成员的数据写入到写入器
/// </summary>
/// <param name="target">目标对象</param>
/// <param name="writer">写入器</param>
/// <param name="member">成员</param>
/// <param name="encodeInt">使用7Bit编码整数</param>
/// <param name="allowNull">是否允许对象为空，如果允许，则写入时增加一个字节表示对象是否为空</param>
protected virtual void WriteMember(Object target, DME_BinaryWriter writer, DME_MemberInfo member, Boolean encodeInt, Boolean allowNull)
{
MemberTypes mt = member.Member.MemberType;
if (mt == MemberTypes.Field || mt == MemberTypes.Property)
{
if (!TryWrite(target, writer, member, encodeInt, allowNull)) throw new InvalidOperationException("无法读取数据，如果是复杂类型请实现IBinaryAccessor接口。");
}
else
throw new ArgumentOutOfRangeException("member", "成员只能是FieldInfo或PropertyInfo。");
}
Boolean TryRead(Object target, DME_BinaryReader reader, DME_MemberInfo member, Boolean encodeInt, Boolean allowNull, out Object value)
{
Type type = member.Type;
// 基本类型
if (reader.TryReadValue(type, encodeInt, out value)) return true;
// 允许空时，先读取一个字节判断对象是否为空
if (allowNull && reader.ReadByte() == 0) return true;
#region 接口支持
//if (Array.IndexOf(member.Type.GetInterfaces(), typeof(IBinaryAccessor)) >= 0)
if (typeof(DME_IBinaryAccessor).IsAssignableFrom(member.Type))
{
// 读取对象
Object obj = member.GetValue(target);
// 实例化对象
if (obj == null)
{
obj = Activator.CreateInstance(type);
member.SetValue(target, obj);
}
if (obj == null) return false;
// 调用接口
DME_IBinaryAccessor accessor = obj as DME_IBinaryAccessor;
accessor.Read(reader);
return true;
}
#endregion
#region 枚举
if (typeof(IEnumerable).IsAssignableFrom(member.Type))
{
// 先读元素个数
Int32 count = reader.ReadEncodedInt32();
if (count < 0) throw new InvalidOperationException("无效元素个数" + count + "！");
Type elementType = member.Type;
if (member.Type.HasElementType)
elementType = member.Type.GetElementType();
else if (member.Type.IsGenericType)
{
Type[] ts = member.Type.GetGenericArguments();
if (ts != null && ts.Length > 0) elementType = ts[0];
}
Array arr = Array.CreateInstance(elementType, count);
for (int i = 0; i < count; i++)
{
if (allowNull && reader.ReadEncodedInt32() == 0) continue;
Object obj = null;
if (!reader.TryReadValue(elementType, encodeInt, out obj))
{
obj = CreateInstance(elementType);
Read(obj, reader, encodeInt, allowNull, member.Member.MemberType == MemberTypes.Property);
}
arr.SetValue(obj, i);
}
value = Activator.CreateInstance(member.Type, arr);
return true;
}
#endregion
return false;
}
/// <summary>
/// 从读取器中读取数据到对象的成员中
/// </summary>
/// <param name="target">目标</param>
/// <param name="reader">读取器</param>
/// <param name="member">成员</param>
/// <param name="encodeInt">使用7Bit编码整数</param>
/// <param name="allowNull">是否允许对象为空，如果允许，则读取时先读取一个字节判断对象是否为空</param>
protected virtual void ReadMember(Object target, DME_BinaryReader reader, DME_MemberInfo member, Boolean encodeInt, Boolean allowNull)
{
Object value = null;
MemberTypes mt = member.Member.MemberType;
if (mt == MemberTypes.Field || mt == MemberTypes.Property)
{
if (!TryRead(target, reader, member, encodeInt, allowNull, out value)) throw new InvalidOperationException("无法读取数据，如果是复杂类型请实现IBinaryAccessor接口。");
member.SetValue(target, value);
}
else
throw new ArgumentOutOfRangeException("member", "成员只能是FieldInfo或PropertyInfo。");
}
