C# WebAPI Deserializing a List returns null

Question

I am having trouble in converting some string to JSON.

I use C# WebAPI to Deserialize string

First： List<GetBookInfoModel> list = JsonConvert.DeserializeObject<List<GetBookInfoModel>>(strOutput01);
Second：List <GetBookDetInfoModel> list = JsonConvert.DeserializeObject<List<GetBookDetInfoModel>>(strOutput01);

And my Json String is like：

First： [{"allbook ":{ " count01 " :3}, " late ":{ " count02 ":0}}]
Second： [{"num ":1, " bookname ":"AAAAA","FinTime ":"2017"},{"num ":2, " bookname ":"iOS","FinTime ":"2017"},{"num ":3, " bookname ":"Visual","FinTime ":"2017"}]

And my Model class is like..

public class GetBookInfoModel
{
    List<GetBookSecondInfoModel> allbook { get; set; }
    List<GetBookSecondInfoModel> late { get; set; }
}
public class GetBookSecondInfoModel
{
    public string count01 { get; set; }

    public string count02 { get; set; }
}


public class GetBookDetInfoModel
{
    public string num { get; set; }

    public string bookname { get; set; }

    public string FinTime { get; set; }
}

But now it returns null.

How can I resolve this problem?Thanks.

In the JSON strings, there are a lot of spaces in your property names. Try to fix that first. — Anders Tornblad
– Anders Tornblad, Commented Mar 1, 2017 at 9:21

Dante May Code · Accepted Answer · 2017-03-01 09:53:08Z

1

It turns out there are 3 issues for the former.

1) The properties of GetBookInfoModel should be public.

public class GetBookInfoModel
{
    public List<GetBookSecondInfoModel> allbook { get; set; }
    public List<GetBookSecondInfoModel> late { get; set; }
}

2) The unnecessary spaces between paired quotes in JSON should be removed.

3) Both allbook and late in JSON should be followed by [].

[{"allbook":[{ "count01"  :3}], "late":[{ "count02":0}]}]

Similar for the latter.

answered Mar 1, 2017 at 9:53

Dante May Code

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