Question

我正在尝试将JSON字符串转换为C＃对象，但是我得到的是空值

下面是我拥有的JSON字符串

[
    {
        "extraction_method": "stream",
        "top": 0.0,
        "left": 0.0,
        "width": 559.0,
        "height": 732.2100219726562,
        "data": [[
                {
                    "top": 0.0,
                    "left": 0.0,
                    "width": 0.0,
                    "height": 0.0,
                    "text": ""
                },
                {
                    "top": 96.36,
                    "left": 129.27,
                    "width": 102.97900390625,
                    "height": 6.550000190734863,
                    "text": "Sample"
                },
                {
                    "top": 96.35,
                    "left": 311.0,
                    "width": 27.188995361328125,
                    "height": 6.550000190734863,
                    "text": "PT"
                },
                {
                    "top": 96.35,
                    "left": 361.0,
                    "width": 41.248992919921875,
                    "height": 6.550000190734863,
                    "text": "HT"
                },
                {
                    "top": 96.36,
                    "left": 432.11,
                    "width": 28.141387939453125,
                    "height": 6.550000190734863,
                    "text": "RT."
                },
                {
                    "top": 96.36,
                    "left": 480.88,
                    "width": 29.64898681640625,
                    "height": 6.550000190734863,
                    "text": "LT."
                },
                {
                    "top": 96.36,
                    "left": 522.33,
                    "width": 36.660003662109375,
                    "height": 6.550000190734863,
                    "text": "MT"
                }
            ], [
                {
                    "top": 727.57,
                    "left": 75.24,
                    "width": 14.902000427246094,
                    "height": 4.619999885559082,
                    "text": "Tee"
                },
                {
                    "top": 0.0,
                    "left": 0.0,
                    "width": 0.0,
                    "height": 0.0,
                    "text": ""
                },
                {
                    "top": 727.57,
                    "left": 315.0,
                    "width": 14.00201416015625,
                    "height": 4.619999885559082,
                    "text": "IO."
                },
                {
                    "top": 727.59,
                    "left": 381.43,
                    "width": 16.6820068359375,
                    "height": 4.619999885559082,
                    "text": "1.10"
                },
                {
                    "top": 727.59,
                    "left": 434.53,
                    "width": 25.582000732421875,
                    "height": 4.619999885559082,
                    "text": "30.00"
                },
                {
                    "top": 727.59,
                    "left": 488.98,
                    "width": 21.131988525390625,
                    "height": 4.619999885559082,
                    "text": "8.00"
                },
                {
                    "top": 727.59,
                    "left": 534.53,
                    "width": 24.469959259033203,
                    "height": 4.619999885559082,
                    "text": "18.00"
                }
            ]],
        "spec_index": 0
    }
]

还有JSON对象的类

public class JsonHelper
{
    string top { get; set; }
    string left { get; set; }
    string width { get; set; }
    string height { get; set; }
    string text { get; set; }
}

public class RootObject
{
    public string extraction_method { get; set; }
    public double top { get; set; }
    public double left { get; set; }
    public double width { get; set; }
    public double height { get; set; }
    public List<List<JsonHelper>> data { get; set; }
    public int spec_index { get; set; }
}

下面的代码用于获取对象

using (StreamReader r = new StreamReader(@"SamplePDF.json"))
        {
            string json = r.ReadToEnd();
            List<RootObject> items = 
                    JsonConvert.DeserializeObject<List<RootObject>>(json);
        }

但是我得到的是，对象中的空值如下（如果未在下面显示图像，则在新选项卡中打开图像）

让我知道相同，谢谢

Answer 1

无法访问以下属性，以下是更改。感谢@John。

public class JsonHelper
{
    string top { get; set; }
    string left { get; set; }
    string width { get; set; }
    string height { get; set; }
    string text { get; set; }
}

Answer 2

您可以为它们提供默认值，例如：

public int X { get; set; } = 0;
public string Y { get; set; } = "";

Answer 3

您的类看起来与JSON字符串的格式不匹配，请尝试

添加新课程
删除类“ public class Class1 {}”的一部分
复制JSON字符串
编辑->选择性粘贴->将JSON作为类粘贴

然后JSON.Net将匹配对象和JSON字符串

我已经尝试过您的示例JSON字符串，并且该对象是通过第4步创建的，

public class Rootobject
{
    public Class1[] Property1 { get; set; }
}

public class Class1
{
    public string extraction_method { get; set; }
    public float top { get; set; }
    public float left { get; set; }
    public float width { get; set; }
    public float height { get; set; }
    public Datum[][] data { get; set; }
    public int spec_index { get; set; }
}

public class Datum
{
    public float top { get; set; }
    public float left { get; set; }
    public float width { get; set; }
    public float height { get; set; }
    public string text { get; set; }
}

将JSON字符串转换为复杂的JSON字符串的C＃对象

3 个答案: