I am trying to create dynamic JSON using ExpandoObject and IDictionary.
During the dynamic creation of JSON there could be instances when the Name or Value would repeat. However when adding the repeated Name or Value to the ExpandoObject, it gives an error:
An item with the same key has already been added.
Below is my code snippet :
DataTable dt_MappedColumns = (DataTable)ViewState["MappedColumns"];
dynamic ManCols = new ExpandoObject();
var dictionary1 = (IDictionary<string, object>)ManCols;
foreach (DataRow dr in dt_MappedColumns.Rows)
{
dictionary1.Add(dr["TColumnName"].ToString(), dr["AColumnName"].ToString());
}
string Manjson = Newtonsoft.Json.JsonConvert.SerializeObject(dictionary1);
The DataTable
looks like this:
Sr.No TColumnName AColumnName
----- ----------- -----------
1 Apple Lion
2 Orange Tiger
3 Mango Fox
4 Orange Wolf
In the above table the first 3 Rows are added successfully into dictionary1
; however, when we try to add the fourth Row, it gives the error.
My desired JSON structure for repeated values would look like this:
{"Apple":"Lion", "Orange":["Tiger","Wolf"], "Mango":"Fox"}
Is it possible to create this JSON structure from the table?
Sure this is possible. Inside your loop you just need to check whether the key already exists in the dictionary and take the appropriate action. There are three cases:
Here is what the code looks like:
Fiddle: https://dotnetfiddle.net/PERc0D