C# 模型绑定生成一个空列表

当我试图通过邮递员发送post请求时，生成的

TestCases

列表是空的。我做错了什么

这是我作为

TestCases

[{“输入参数”：[{“值”：“你好世界”，“类型”：“字符串”}]，“预期输出”：“test123123”}，{“输入参数”：[{“值”：“你好世界2”，“类型”：“字符串”}]，“预期输出”：“test123123”}]

但是创建的结果模型有一个空的

测试用例列表

如何复制：

邮递员要求：

    {
    "info": {
        "_postman_id": "6f252c2d-adb0-487e-ba68-d32172ebae91",
        "name": "test",
        "schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
    },
    "item": [
        {
            "name": "Create Assignment",
            "request": {
                "method": "POST",
                "header": [
                    {
                        "key": "",
                        "value": "application/json",
                        "type": "text",
                        "disabled": true
                    },
                    {
                        "key": "Content-Type",
                        "name": "Content-Type",
                        "value": "application/json",
                        "type": "text"
                    }
                ],
                "body": {
                    "mode": "urlencoded",
                    "urlencoded": [
                        {
                            "key": "description",
                            "value": "testDesc2",
                            "type": "text"
                        },
                        {
                            "key": "test_cases",
                            "value": "[{\"input_params\":[{\"value\":\"Hello World\",\"type\":\"string\"}],\"expected_output\":\"test123123\"}, {\"input_params\":[{\"value\":\"Hello World\",\"type\":\"string\"}],\"expected_output\":\"test123123\"}]",
                            "type": "text"
                        },
                        {
                            "key": "TestCases",
                            "value": "TestCases[]=1050&TestCases[]=2000\n",
                            "type": "text",
                            "disabled": true
                        }
                    ]
                },
                "url": {
                    "raw": "{{localhost}}/api/assignment/create",
                    "host": [
                        "{{localhost}}"
                    ],
                    "path": [
                        "api",
                        "assignment",
                        "create"
                    ]
                }
            },
            "response": []
        }
    ],
    "protocolProfileBehavior": {}
}

控制器方法：

 [HttpPost("create")]
    public async Task<ActionResult<Assignment>> CreateAssignment([FromForm] Assignment assignment)
    {
        Debug.Write(assignment);
        return Ok();
    }

---

这就是你要通过的吗？您需要为其提供Assignemnt Assignment的序列化实例-仅发送TestCases值将不起作用。@fredrik您的意思是这样的（来自dotnet doc的示例）：

selectedCourses[]=1050&selectedCourses[]=2000

？我不能发送一个JSON数组吗？我不知道那是什么类型的语法。如果调用需要赋值的函数，那么JSON必须表示该类，而不仅仅是其中的一个属性。否则它怎么知道如何反序列化？@fredrik它可以反序列化通过表单数据传递的属性。如您所见，

Description

映射得很好。唯一的问题是列表。当您以这种方式通过表单参数发送内容时，其中的json代码不会被解析。您需要将整个请求重新制作为请求主体中的json数据—无表单参数。现在它是空的，因为字符串不是测试用例列表。

 public class Assignment : EntityBase
{
    public Assignment()
    {
        this.CreatedDate = DateTime.UtcNow;
    }

    [Required]
    public string Description { get; set; }

    [JsonProperty("test_cases")]
    [BindProperty(Name = "test_cases")]
    [Required]
    public virtual List<TestCase> TestCases { get; set; }

    public virtual List<Solution> Solutions { get; set; }

    [DataType(DataType.Date)]
    [JsonProperty("created_date")]
    [Required]
    public DateTime CreatedDate { get; private set; }
}

 public class TestCase : EntityBase
{
    [JsonProperty("input_params")]
    [BindProperty(Name = "input_params")]
    public virtual List<InputParam> InputParams { get; set; }

    [JsonProperty("expected_output")]
    [BindProperty(Name = "expected_output")]
    public string ExpectedOuput { get; set; }

    [JsonIgnore]
    public int AssignmentId { get; private set; }
    [JsonIgnore]
    public virtual Assignment Assignment { get; private set; }
}

public abstract class EntityBase
{
    [Required]
    public int Id { get; private set; }
}