Windows 窗体 C# JSON 数据在反序列化后不显示

Windows Forms C# JSON Data doesn't show after deserialization

提问人：gb00- 提问时间：10/6/2023 最后编辑：Brian Tompsett - 汤莱恩gb00- 更新时间：10/7/2023 访问量：57

问：

我正在尝试从 API 中提取数据并显示控件中的数据，但在反序列化数据后，它显示：DataGridView

this instead.

Click 事件的代码：Button1

private async void button1_Click(object sender, EventArgs e)
        {
            try
            {
                var postData = new PostData
                {
                    id=5,
                    title = "yeni",
                    description = "yenidesc",
                    type_name="yenitype"
                };

                var client = new HttpClient();
                client.BaseAddress = new Uri("-i_know_that_my_uri_should_be_here-");

                var json = JsonConvert.SerializeObject(postData);
                var content = new StringContent(json, Encoding.UTF8, "application/json");

                var response = client.PostAsync("products",content).Result;

                if (response.IsSuccessStatusCode)
                {
                    var responseContent = response.Content.ReadAsStringAsync().Result;
                    var postResponse = JsonConvert.DeserializeObject<PostResponse>(responseContent); //JsonSerializer.Deserialize<PostResponse>(responseContent);
                    MessageBox.Show("help: "+ postResponse);
                    dataGridView1.DataSource = postResponse;
                    dataGridView1.Refresh();
                }
                else
                {
                    MessageBox.Show("Hata: " + response.StatusCode);
                }
            }
            catch (Exception error)
            {
                MessageBox.Show(error.Message);
            }
        }

这是我的班级：PostData

public class PostData
    {
        public int id { get; set; }
        public string title { get; set; }
        public string description { get; set; }
        public string type_name { get; set; }

    }

这是我的班级：PostResponse

 public class PostResponse
    {
        public int id { get; set; }
        public string title { get; set; }
        public string description { get; set; }
        public string type_name { get; set; }

    }

这是我的JSON文件：

{"message":"product data has been taken successfully","products":[{"id":116,"title":"GASA","description":"fdsafsd","situation":1,"type_name":"Kasa","type_id":1,"features":[{"products_type_feature_id":56,"feature_name":"Marka","feature_unit_name":"","feature":"efwef"},{"products_type_feature_id":57,"feature_name":"Model","feature_unit_name":"","feature":"wefw"},{"products_type_feature_id":58,"feature_name":"Kasa Tipi","feature_unit_name":"","feature":""},{"products_type_feature_id":59,"feature_name":"Kasa Boyutu","feature_unit_name":"","feature":"fwef"},{"products_type_feature_id":60,"feature_name":"Renk","feature_unit_name":"","feature":"fewe"},{"products_type_feature_id":61,"feature_name":"Malzeme","feature_unit_name":"","feature":""},{"products_type_feature_id":62,"feature_name":"Soğutma Sistemi","feature_unit_name":"","feature":"wefw"},{"products_type_feature_id":63,"feature_name":"Ön Panel Bağlantı Noktaları","feature_unit_name":"","feature":"efwef"},{"products_type_feature_id":64,"feature_name":"Ağırlık","feature_unit_name":"kg","feature":"fwefwef"},{"products_type_feature_id":65,"feature_name":"İşlemci Modeli","feature_unit_name":"","feature":""},{"products_type_feature_id":66,"feature_name":"Anakart Modeli","feature_unit_name":"","feature":""},{"products_type_feature_id":67,"feature_name":"Bellek Kapasitesi","feature_unit_name":"GB","feature":""},{"products_type_feature_id":68,"feature_name":"HDD Kapasitesi","feature_unit_name":"GB","feature":""},{"products_type_feature_id":69,"feature_name":"SSD Kapasitesi","feature_unit_name":"GB","feature":""},{"products_type_feature_id":70,"feature_name":"Ekran Kartı Modeli","feature_unit_name":"","feature":""},{"products_type_feature_id":71,"feature_name":"Ekran Kartı Kapasitesi","feature_unit_name":"GB","feature":""},{"products_type_feature_id":72,"feature_name":"İşletim Sistemi","feature_unit_name":"","feature":""},{"products_type_feature_id":73,"feature_name":"Güç Kaynağı Kapasitesi","feature_unit_name":"Watt","feature":""}]},{"id":115,"title":"nııgaaa","description":"gfdgfd","situation":1,"type_name":"Laptop","type_id":2,"features":[{"products_type_feature_id":43,"feature_name":"Marka","feature_unit_name":"","feature":"a"},{"products_type_feature_id":44,"feature_name":"Model","feature_unit_name":"","feature":"a"},{"products_type_feature_id":45,"feature_name":"Ekran Boyutu","feature_unit_name":"inç","feature":"a"},{"products_type_feature_id":46,"feature_name":"İşlemci Modeli","feature_unit_name":"","feature":"a"},{"products_type_feature_id":47,"feature_name":"Bellek Kapasitesi","feature_unit_name":"GB","feature":"a"},{"products_type_feature_id":48,"feature_name":"HDD Kapasitesi","feature_unit_name":"GB","feature":"a"},{"products_type_feature_id":49,"feature_name":"SSD Kapasitesi","feature_unit_name":"GB","feature":"a"},{"products_type_feature_id":50,"feature_name":"Ekran Kartı Modeli","feature_unit_name":"","feature":"a"},{"products_type_feature_id":51,"feature_name":"Ekran Kartı Kapasitesi","feature_unit_name":"GB","feature":""},{"products_type_feature_id":52,"feature_name":"İşletim Sistemi","feature_unit_name":"","feature":""},{"products_type_feature_id":53,"feature_name":"Batarya Ömrü","feature_unit_name":"saat","feature":""},{"products_type_feature_id":54,"feature_name":"Ağırlık","feature_unit_name":"kg","feature":""}]}]}

顺便说一句，这是我在 StackOverflow 上的第一篇文章。如果我犯了任何错误，我深表歉意。

我试过使用 ，但结果仍然相同。 我本来以为它会正常工作并列出，但不，它没有。System.Text.JsonDataGridView

C# JSON WinForms json.net

评论

1赞 Martheen 10/6/2023
嗯，是的，会调用其中的，因为你没有覆盖，只会给你类的全名。创建覆盖或选择要显示的特定字段。"help: "+ postResponse.ToString()PostResponse
1赞 Martheen 10/6/2023
learn.microsoft.com/en-us/dotnet/csharp/programming-guide/......
2赞 Martheen 10/6/2023
此外，您可能还想尝试 json2csharp.com 自动构建适当的类。在您的示例中，json2csharp 应该在某处为您提供一个数组，然后您使用该数组作为数据网格的源

答：

0赞 Yong Shun 10/6/2023 #1

根据 DataGridView.DataSource，应提供以下类型的值：

  • 接口，包括一维数组。IList

  • 接口，例如 DataTable 和 DataSet 类。IListSource

  • 接口，如 BindingList 类。IBindingList

  • 接口，如 BindingSource 类。IBindingListView

而您尝试反序列化的 JSON 响应与结构不匹配。结构应为：PostResponsePostResponse

using System.Collections.Generic;

public class PostResponse
{
    public string Message { get; set; }
    public List<ProductData> Products { get; set; }
    
}

public class ProductData
{
    public int Id { get; set; }
    public string Title { get; set; }
    public string Description { get; set; }
    [JsonProperty("type_name")]
    public string TypeName { get; set; }
}

您应该提供 给 .postResponse.productsdataGridView1.DataSource

var postResponse = JsonConvert.DeserializeObject<PostResponse>(responseContent);
dataGridView1.DataSource = postResponse.Products;
dataGridView1.Refresh();

旁注：

  1. 由于您的方法是 ，因此您应该使用 代替 来避免死锁。asyncawait/* Task */.Result
var responseContent = response.Content.ReadAsStringAsync().Result

自：

var responseContent = await response.Content.ReadAsStringAsync();
  1. 使用 Pascal 大小写而不是驼峰大小写声明属性名称。

评论

0赞 gb00- 10/6/2023
非常感谢。它现在正在工作，我能够在 datagridview 中列出 api 数据。非常感谢。

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