public static ShardKey <TRecord, TChild> FromExternalString(string value)
{
var aValues = StringExtensions.SerializeFromExternalString(value);
int orgnLen = aValues[0] & 3;
var orgn = System.Text.Encoding.UTF8.GetString(aValues, 1, orgnLen)[0];
var pos = orgnLen + 1;
short shardId = ShardKey <TRecord> .ConvertFromBytes(aValues, ref pos, typeof(short));
TRecord recordId = ShardKey <TRecord> .ConvertFromBytes(aValues, ref pos, typeof(TRecord));
TChild childId = ShardKey <TRecord> .ConvertFromBytes(aValues, ref pos, typeof(TChild));
return(new ShardKey <TRecord, TChild>(orgn, shardId, recordId, childId));
}
internal static dynamic ConvertFromBytes(byte[] data, ref int position, Type valueType)
{
if (valueType == typeof(int))
{
position += 4;
return(BitConverter.ToInt32(data, position - 4));
}
if (valueType == typeof(long))
{
position += 8;
return(BitConverter.ToInt64(data, position - 8));
}
if (valueType == typeof(byte))
{
position += 1;
return(data[position - 1]);
}
if (valueType == typeof(short))
{
position += 2;
return(BitConverter.ToInt16(data, position - 2));
}
if (valueType == typeof(char))
{
position += 2;
return(BitConverter.ToChar(data, position - 2));
}
if (valueType == typeof(decimal))
{
var i0 = BitConverter.ToInt32(data, position);
var i1 = BitConverter.ToInt32(data, position + 4);
var i2 = BitConverter.ToInt32(data, position + 8);
var i3 = BitConverter.ToInt32(data, position + 12);
position += 16;
return((dynamic) new Decimal(new int[] { i0, i1, i2, i3 }));
}
if (valueType == typeof(double))
{
position += 8;
return(BitConverter.ToDouble(data, position - 8));
}
if (valueType == typeof(float))
{
position += 4;
return(BitConverter.ToSingle(data, position - 4));
}
if (valueType == typeof(uint))
{
position += 4;
return(BitConverter.ToUInt32(data, position - 4));
}
if (valueType == typeof(ulong))
{
position += 8;
return(BitConverter.ToUInt64(data, position - 8));
}
if (valueType == typeof(ushort))
{
position += 2;
return(BitConverter.ToUInt16(data, position - 2));
}
if (valueType == typeof(sbyte))
{
position += 1;
return((sbyte)((int)data[position - 1] - 128));
}
if (valueType == typeof(bool))
{
position += 1;
return(BitConverter.ToBoolean(data, position - 1));
}
if (valueType == typeof(DateTime))
{
position += 8;
return(new DateTime(BitConverter.ToInt64(data, position - 8)));
}
if (valueType == typeof(string))
{
if (data[position] == 0)
{
position += 1;
return((string)null);
}
var len = (int)data[position] >> 1;
position += len + 1;
return(System.Text.Encoding.UTF8.GetString(data, position - len, len));
}
if (valueType == typeof(Enum))
{
var baseType = Enum.GetUnderlyingType(valueType);
return(ShardKey <TRecord> .ConvertFromBytes(data, ref position, baseType));
}
if (valueType == typeof(Nullable))
{
var isNull = BitConverter.ToBoolean(data, position);
position += 1;
if (isNull)
{
return(null);
}
var baseType = Nullable.GetUnderlyingType(valueType);
return(ConvertFromBytes(data, ref position, baseType));
}
if (valueType == typeof(Guid))
{
var result = new Guid(new byte[] { data[position], data[position + 1], data[position + 2], data[position + 3], data[position + 4], data[position + 5], data[position + 6], data[position + 7], data[position + 8], data[position + 9], data[position + 10], data[position + 11], data[position + 12], data[position + 13], data[position + 14], data[position + 15] });
position += 16;
return(result);
}
else
{
throw new Exception($"Could not recognized the type {valueType.ToString()}.");
}
}