asp core web api http post为空

Question

我通过查看 ms 基本文档创建了一个 webapi。

ms Doc

这是工作 todoitems

除了待办事项我 因为我想用头像图的形式 插入模型头像，创建头像上下文，将控制器做成脚手架。

solution view

但是，当我尝试以帖子的形式接收数据时，数据始终为空。 error

null

这是代码

[Route("api/AvatarCharts")]
    [ApiController]
    public class AvatarChartsController : ControllerBase
    {
        private readonly AvatarChartContext _context;

        public AvatarChartsController(AvatarChartContext context)
        {
            _context = context;
        }

        // GET: api/AvatarCharts
        [HttpGet]
        public async Task<ActionResult<IEnumerable<AvatarChart>>> GetAvatarCharts()
        {
            return await _context.AvatarCharts.ToListAsync();
        }

        // GET: api/AvatarCharts/5
        [HttpGet("{modelId}")]
        public async Task<ActionResult<AvatarChart>> GetAvatarChart(long modelId)
        {
            var avatarChart = await _context.AvatarCharts.FindAsync(modelId);

            if (avatarChart == null)
            {
                return NotFound();
            }

            return avatarChart;
        }

        // PUT: api/AvatarCharts/5
        // To protect from overposting attacks, see https://go.microsoft.com/fwlink/?linkid=2123754
        [HttpPut("{modelId}")]
        public async Task<IActionResult> PutAvatarChart(long modelId, AvatarChart avatarChart)
        {
            if (modelId != avatarChart.modelId)
            {
                return BadRequest();
            }

            _context.Entry(avatarChart).State = EntityState.Modified;

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!AvatarChartExists(modelId))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return NoContent();
        }

        // POST: api/AvatarCharts
        // To protect from overposting attacks, see https://go.microsoft.com/fwlink/?linkid=2123754
        [HttpPost]
        public async Task<ActionResult<AvatarChart>> PostAvatarChart( AvatarChart avatarChart)
        {
            _context.AvatarCharts.Add(avatarChart);
            await _context.SaveChangesAsync();

            return CreatedAtAction("GetAvatarChart", new { modelId = avatarChart.modelId }, avatarChart);
        }

        // DELETE: api/AvatarCharts/5
        [HttpDelete("{modelId}")]
        public async Task<IActionResult> DeleteAvatarChart(long modelId)
        {
            var avatarChart = await _context.AvatarCharts.FindAsync(modelId);
            if (avatarChart == null)
            {
                return NotFound();
            }

            _context.AvatarCharts.Remove(avatarChart);
            await _context.SaveChangesAsync();

            return NoContent();
        }

        private bool AvatarChartExists(long modelId)
        {
            return _context.AvatarCharts.Any(e => e.modelId == modelId);
        }
    }

 public class AvatarChartContext :DbContext
    {
        public AvatarChartContext(DbContextOptions<AvatarChartContext> options) : base(options)
        {

        }
        public DbSet<AvatarChart> AvatarCharts { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<AvatarChart>().HasKey(c => c.modelId);

            
        }
    }

public class AvatarChart
    {
        [Key]
        public long modelId;
        public string colorCode;
        public long dateTime;        //ex 20210101130000
        public string name;
        public string diagnose;

    }

swagger

添加 postgressql dbenter image description here

Answer 1

更新：

你错过了 {get;设置;}。

public class AvatarChart
{
    [Key]
    public long modelId {get; set;}
    public string colorCode {get; set;}
    public long dateTime {get; set;}        //ex 20210101130000
    public string name {get; set;}
    public string diagnose {get; set;}

}

Answer 2

您能否进行这些更改并告诉我变量结果返回了什么值。另外，你能先验证你的 ModelState 吗？ [HttpPost] 公共异步任务 PostAvatarChart(AvatarChart avatarChart) {

        await _context.AvatarCharts.AddAsync(avatarChart);
        var result = await _context.SaveChangesAsync() > 0;

        return CreatedAtAction("GetAvatarChart", new { modelId = avatarChart.modelId }, avatarChart);
    }