How to convert camel case format my data? - asp.net-core

Question

I am executiong sql queries from different data sources. And I am getting the results as dynamic objects like following.
private IEnumerable<IDictionary<string, object>> GetDataFromPostgresql()
{
var dataList = new List<IDictionary<string, object>>();
IDictionary<string, object> obj = new ExpandoObject();
obj.Add("first_name", "john");
obj.Add("last_name", "smith");
obj.Add("age", 25);
dataList.Add(new Dictionary<string, object>(obj));
return dataList;
}
private IEnumerable<IDictionary<string, object>> GetDataFromOracle()
{
var dataList = new List<IDictionary<string, object>>();
IDictionary<string, object> obj = new ExpandoObject();
obj.Add("FIRST_NAME", "john");
obj.Add("LAST_NAME", "smith");
obj.Add("AGE", 25);
dataList.Add(new Dictionary<string, object>(obj));
return dataList;
}
private IEnumerable<IDictionary<string, object>> GetDataFromMssql()
{
var dataList = new List<IDictionary<string, object>>();
IDictionary<string, object> obj = new ExpandoObject();
obj.Add("FirstName", "john");
obj.Add("LastName", "smith");
obj.Add("Age", 25);
dataList.Add(new Dictionary<string, object>(obj));
return dataList;
}
I am using these data collections in my asp.net core controller.
[HttpGet]
[Route("")]
public IActionResult Get()
{
var dataList = GetDataFromPostgresql();
return Ok(dataList);
}
But I want to serialize responses a standart camel case format.
{ "firstName": "john", "lastName": "smith", "age": 25 }
So how can I do this?

Answer 1

PascalCase means it has a capitalized first letter, but if this kind of outcome that you are after, { "firstName": "john", "lastName": "smith", "age": 25 }, that's called camelCase.
I am not familiar with nowadays asp.net-core, but I am sure the RegExp would be the same as this JavaScript one.
function toUpperCase(raw, letter) {
return letter.toUpperCase();
}
function asCamelCase(str) {
// put an underscore between camel cases
return str.replace(/([a-z])([A-Z])/g, '$1_$2')
// make the whole string lower case
.toLowerCase()
// capitalize every letter after the underscore
.replace(/_+([^_]|$)/g, toUpperCase);
}
Above example would produce (try by copying and pasting it in your browser console) always firstName, given the following inputs:
asCamelCase("FirstName"); // firstName
asCamelCase("FIRST_NAME"); // firstName
asCamelCase("first_name"); // firstName
I hope this helped 👋

Answer 2

Try to use below code to change the key in Dictionary to CamelCase
[HttpGet]
[Route("")]
public IActionResult Get()
{
var dataList = GetDataFromPostgresql();
var newDataList = new List<IDictionary<string, object>>();
foreach (var data in dataList)
{
var newData = new Dictionary<string, object>();
foreach (var key in data.Keys)
{
var newKey = "";
var value = data[key];
var index = key.IndexOf('_');
if(index < 0)//for GetDataFromMssql()
{
newKey = Char.ToLowerInvariant(key[0]) + key.Substring(1);
}else
{
newKey = key.ToLowerInvariant().Replace("_", string.Empty).Replace(" ", string.Empty);
newKey = newKey.Replace(newKey[index], Char.ToUpperInvariant(newKey[index]));
}
newData.Add(newKey, value);
}
newDataList.Add(newData);
}
return Ok(newDataList);
}
If you have complex value like "first_name_hello_test", you could use below workaround:
[HttpGet]
[Route("")]
public IActionResult Get()
{
var dataList = GetDataFromPostgresql();
var newDataList = new List<IDictionary<string, object>>();
foreach (var data in dataList)
{
var newData = new Dictionary<string, object>();
foreach (var key in data.Keys)
{
var newKey = "";
var value = data[key];
var indexList = new List<int>();
var index = key.IndexOf('_');
if (index < 0)
{
newKey = Char.ToLowerInvariant(key[0]) + key.Substring(1);
}else
{
while (index >= 0)
{
indexList.Add(index);
index = key.IndexOf('_', index + 1);
}
newKey = key.ToLowerInvariant();
foreach(var i in indexList)
{
newKey = newKey.Replace(newKey[i+1], Char.ToUpperInvariant(newKey[i+1]));
}
newKey = newKey.Replace("_", string.Empty).Replace(" ", string.Empty);
}
newData.Add(newKey, value);
}
newDataList.Add(newData);
}
return Ok(newDataList);
}