I have written the code to deserialize JSON from String to Class(DashBoardReport) Object type,but it gives me below exception, I checked out my JSON structure, it is a valid JSON structure and also it is matching with the DashBoardReport Class structure, so I don't understand why its giving me the cast related exception,please help.
Complete Exception:
Newtonsoft.Json.JsonSerializationException: Error converting value "{"Company":"Shyamlal Bros","VoucherType":"PurcOrder","Interval":null,"CurrentPeriodSummary":{"StartDate":"20170401","EndDate":"20170430","Amount":2459250.0,"Monthlygross":0.0},"PreviousPeriodSummary":{"StartDate":null,"EndDate":null,"Amount":0.0,"Monthlygross":0.0},"CurrentPeriodNetAmount":" ","CurrentPeriodDetails":[{"StartDate":"1-Apr-2017","EndDate":"30-Apr-2017","Amount":2459250.0,"Monthlygross":0.0}],"PreviousPeriodDetails":[],"GrowthIndicator":null,"Growth":0.0,"GroupByReport":null,"Error":null}" to type 'DashBoard.DashboardReport'. Path '', line 1, position 570. ---> System.ArgumentException: Could not cast or convert from System.String to DashBoard.DashboardReport.
Code For Deserialization :
string json="{\"Company\":\"Shyamlal Bros\",\"VoucherType\":\"PurcOrder\",\"Interval\":null,\"CurrentPeriodSummary\":{\"StartDate\":\"20170401\",\"EndDate\":\"20170430\",\"Amount\":2459250.0,\"Monthlygross\":0.0},\"PreviousPeriodSummary\":{\"StartDate\":null,\"EndDate\":null,\"Amount\":0.0,\"Monthlygross\":0.0},\"CurrentPeriodNetAmount\":\"\",\"CurrentPeriodDetails\":[{\"StartDate\":\"1-Apr-2017\",\"EndDate\":\"30-Apr-2017\",\"Amount\":2459250.0,\"Monthlygross\":0.0}],\"PreviousPeriodDetails\":[],\"GrowthIndicator\":null,\"Growth\":0.0,\"GroupByReport\":null,\"Error\":null}";
DashboardReport r=JsonConvert.DeserializeObject<DashboardReport>(json);
string jsonMonth = JsonConvert.SerializeObject(r);
Console.WriteLine(jsonMonth);
Beutified JSON Structure ie to be deserialized:
{
"Company": "Shyamlal Bros",
"VoucherType": "PurcOrder",
"Interval": null,
"CurrentPeriodSummary": {
"StartDate": "20170401",
"EndDate": "20170430",
"Amount": 2459250,
"Monthlygross": 0
},
"PreviousPeriodSummary": {
"StartDate": null,
"EndDate": null,
"Amount": 0,
"Monthlygross": 0
},
"CurrentPeriodNetAmount": " ",
"CurrentPeriodDetails": [
{
"StartDate": "1-Apr-2017",
"EndDate": "30-Apr-2017",
"Amount": 2459250,
"Monthlygross": 0
}
],
"PreviousPeriodDetails": [],
"GrowthIndicator": null,
"Growth": 0,
"GroupByReport": null,
"Error": null
}
DashboardReport Class structure:
public class DashboardReport:ITallyReport
{
private string company;
private string voucherType;
private string interval;
private string error;
private DashboardReportElement currentPeriodSummary;
private string currentPeriodNetAmount;
private DashboardReportElement previousPeriodSummary;
private DashboardReportElement[] currentPeriodDetails;
private DashboardReportElement[] previousPeriodDetails;
public DashboardReport()
{
currentPeriodSummary = new DashboardReportElement();
previousPeriodSummary = new DashboardReportElement();
currentPeriodDetails = new DashboardReportElement[] { };
previousPeriodDetails = new DashboardReportElement[] { };
}
public string Company
{
get
{
return company;
}
set
{
company = value;
}
}
public string VoucherType
{
get
{
return voucherType;
}
set
{
voucherType = value;
}
}
public string Interval
{
get
{
return interval;
}
set
{
interval = value;
}
}
public DashboardReportElement CurrentPeriodSummary
{
get
{
return currentPeriodSummary;
}
set
{
currentPeriodSummary = value;
}
}
public DashboardReportElement PreviousPeriodSummary
{
get
{
return previousPeriodSummary;
}
set
{
previousPeriodSummary = value;
}
}
public string CurrentPeriodNetAmount { get => currentPeriodNetAmount; set => currentPeriodNetAmount = value; }
public DashboardReportElement[] CurrentPeriodDetails
{
get
{
return currentPeriodDetails;
}
set
{
currentPeriodDetails = value;
}
}
public DashboardReportElement[] PreviousPeriodDetails
{
get
{
return previousPeriodDetails;
}
set
{
previousPeriodDetails = value;
}
}
public string GrowthIndicator { get; set; }
public double Growth { get; set; }
public DashboardGroupByReport GroupByReport { get; set; }
public string Error { get => error; set => error = value; }
//public ReportElement[] Data { get; set; }
//public string GroupBy { get; set; }
public string ToJson()
{
return JsonConvert.SerializeObject(this);
}
}
Structure of DashBoardReportElement Class:
public class DashboardReportElement
{
private string startDate;
private string endDate;
private double amount;
private double monthlygross;
public DashboardReportElement()
{
}
public string StartDate
{
get
{
return startDate;
}
set
{
startDate = value;
}
}
public string EndDate
{
get
{
return endDate;
}
set
{
endDate = value;
}
}
public Double Amount
{
get
{
return amount;
}
set
{
amount = value;
}
}
public double Monthlygross { get => monthlygross; set => monthlygross = value; }
}
Most likely your exception is coming from a bad-formatted JSON string.
Your example code works nicely. If we take a smaller example:
string json="{\"Company\":\"Shyamlal Bros\"}";
It will be serialised again into your class without troubles, just like the string from your example. But if you have it with extra quotation:
string json="\"{\"Company\":\"Shyamlal Bros\"}\"";
You are in trouble. So the solution is to trim those:
json = json.Trim("\"".ToCharArray());
As a side note - in your example there is no need for a field-backed properties, your class can be easily rewritten as
public class DashboardReport
{
public string Company { get; set; }
public string VoucherType { get; set; }
public string Interval { get; set; }
public DashboardReportElement CurrentPeriodSummary { get; set; }
public DashboardReportElement PreviousPeriodSummary { get; set; }
public string CurrentPeriodNetAmount { get; set; }
public DashboardReportElement[] CurrentPeriodDetails { get; set; }
public DashboardReportElement[] PreviousPeriodDetails { get; set; }
public string GrowthIndicator { get; set; }
public double Growth { get; set; }
public DashboardGroupByReport GroupByReport { get; set; }
public string Error { get; set; }
public string ToJson()
{
return JsonConvert.SerializeObject(this);
}
}
i think the json you have provided here is correct but the json which you are using in your actual code is bad. You may be using json as
string json="\"{\"Company\":\"Shyamlal Bros\",\"VoucherType\":\"PurcOrder\",\"Interval\":null,\"CurrentPeriodSummary\":{\"StartDate\":\"20170401\",\"EndDate\":\"20170430\",\"Amount\":2459250.0,\"Monthlygross\":0.0},\"PreviousPeriodSummary\":{\"StartDate\":null,\"EndDate\":null,\"Amount\":0.0,\"Monthlygross\":0.0},\"CurrentPeriodNetAmount\":\"\",\"CurrentPeriodDetails\":[{\"StartDate\":\"1-Apr-2017\",\"EndDate\":\"30-Apr-2017\",\"Amount\":2459250.0,\"Monthlygross\":0.0}],\"PreviousPeriodDetails\":[],\"GrowthIndicator\":null,\"Growth\":0.0,\"GroupByReport\":null,\"Error\":null}\"";
// Extra Quatation Marks in json
Is Your DashboardReportElement look like this ?
public class DashboardReportElement
{
public string StartDate { get; set; }
public string EndDate { get; set; }
public int Amount { get; set; }
public int Monthlygross { get; set; }
}
Use List<DashboardReportElement>
as a return type Instead of DashboardReportElement[]
array
Ex -
private DashboardReportElement currentPeriodSummary;
private string currentPeriodNetAmount;
private DashboardReportElement previousPeriodSummary;
private List<DashboardReportElement> currentPeriodDetails; // made List instead of array
private List<DashboardReportElement> previousPeriodDetails; // made List instead of Array
I got this error when requesting application/json
:
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
If I remove the header I received correct json. (I guess it is a misconfiguration at the server-side, but at te moment I've got bigger fish to fry.)
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