Hi Logan,



Thank you for your answer.



I've tried out the DataPacker and works fine except the part of ignoring NULL values.

Is there an option for the DataPacker that I just haven't seen?



Regards,



Wilko

There is no option of ignoring NULL values.

Hi Marco;

FYI: Wilko's post refers to a .NET DataStore .. so I "think" that he is referring to a SNAP C# object not PB. Could be wrong here though. Just my guess.

Regards ... Chris

oops, didnt see the tag. :-)

Then I would have a look at json.net from newtonsoft.

A .NET datastore is an Enumerable, and all IEnumerable types can be serialized as json array.

Best,

.m

Hi Marco,



thanks for your answer.



I've tried 2 things from newtonsoft. "SerializeObject" from "JsonConvert" and the "JsonWriter".



First to the "JsonConvert". It works fine to eliminate NULL values, but now the upcomming problem is that I'm just able to serialize 1 datastore with the following result:



{

"column1": "xxx",

"column2": 1,

"column3": "xxx"

}



1. So how do I can force an extra section into the created json?

2. Do I have to link the secound datastore for table2 with the first one?

3. Is there an equivalent to the modelbuilder in entity framework for .NET Datastores?



Now my question to the JsonWriter:

1. Do I realy have to write "WritePropertyName" and "WriteValue" for every coulmn? Isn't the a more elegant method?

2. Does exits an option for ignoring NULL values similar to the "NullValueHandling" of "JsonSerializerSettings" for the "JsonConvert"? Or do I have to check every value in an if-clause before writing the property?



My Code looks like this:



var dsStore = new DataStore<Ds_Table1>(context);

dsStore.Retrieve();



StringBuilder sb = new StringBuilder();

StringWriter sw = new StringWriter(sb);



using (JsonWriter writer = new JsonTextWriter(sw))

{

writer.Formatting = Formatting.Indented;

for (int i=0;i<dsStore.RowCount;i++)

{

writer.WriteStartObject();

writer.WritePropertyName("column1");

writer.WriteValue(dsStore.GetItem<int>(i,"column1",DwBuffer.Primary));

// extra section for column2

writer.WritePropertyName("table2");

writer.WriteStartObject();

writer.WritePropertyName("column2");

writer.WriteValue(dsStore.GetItem<int>(i,"column2",DwBuffer.Primary));

writer.WriteEnd();

writer.WritePropertyName("column3");

writer.WriteValue(dsStore.GetItem<int>(i,"column3",DwBuffer.Primary));

//... some more columns

writer.WriteEndObject();

}

}



Thanks and regards,



Wilko Lindemann