我无法使用Entity Framework Core和Ajax将数据存储到数据库中

Question

我的代码有问题。问题是我没有使用ajax按参数获取发布数据。

任何人都可以解决此问题吗？代码如下所示。

这是Javascript Ajax代码，我在其中通过post方法将数据发送到控制器：

$('#pending').click(function () {
    SaveTestResult("/Reception/PatientTests/SavePendingTest");
});

function SaveTestResult(url) {
    var pid = $('.patientId').attr('id');
    var tid = "";
    var tval = "";
    var tpid = "";
    var tests = [];

    $("table > tbody > tr").each(function () {
        testId = $(this).find('.tid').val();

        if(typeof(testId) != "undefined")
        {
            tid = testId;
        }

        var rowText = ""

        $(this).find('td').each(function () {
            tpid = $(this).find('.tpId').val();
            tval = $(this).find('.result').val();

            if (typeof (tpid) != "undefined") {
                tests.push({ PatientId: pid, TestId: tid, TestParameterId: tpid, TestValue: tval });
            }
        });
    });

    // alert(JSON.stringify(tests));   
    $.ajax({
            type: "POST",
            url: url,
            data: JSON.stringify(tests),
            headers: { "RequestVerificationToken": $('input[name="__RequestVerificationToken"]').val() },
            success: function (data) {
                alert(data);
            },
            error: function (e) {
                alert('Error' + JSON.stringify(e));
            }
    });
}

这是控制器：

[HttpPost]
public async Task<IActionResult> SavePendingTest(List<PendingTestResult> pendingTestResult)
{
    if (ModelState.IsValid)
    {
        foreach (PendingTestResult ptr in pendingTestResult)
        {
            _db.Add(ptr);
            await _db.SaveChangesAsync();
        }

        return RedirectToAction(nameof(Index));
    }

    return View();
}

这是模型类：

public class PendingTestResult
{
    [Key]
    public int Id { get; set; }
    [Display(Name = "Patient Id")]
    public int PatientId { get; set; }

    [Display(Name = "Test Id")]
    public int TestId { get; set; }

    [Display(Name = "Test Parameter")]
    public int TestParameterId { get; set; }
    public string TestValue { get; set; }

    [Display(Name = "Test")]
    [ForeignKey("TestId")]
    //relation of Tests table
    public virtual Tests Tests { get; set; }

    [Display(Name = "Patient")]
    [ForeignKey("PatientId")]
    //relation of Patient table
    public virtual Patient Patient { get; set; }

    [Display(Name = "Test Parameter")]
    [ForeignKey("TestId")]
    //relation of Patient table
    public virtual TestParameter TestParameter { get; set; }
}

请帮助我解决此问题并将列表保存到数据库中

Answer 1

添加contentType: "application/json"以指定要发送的数据类型。如果未指定，默认情况下它将使用application/x-www-form-urlencoded; charset=UTF-8：

 $.ajax({
        type: "POST",
        url: url,
        data: JSON.stringify(tests),
        contentType: "application/json",
        headers: { "RequestVerificationToken": $('input[name="__RequestVerificationToken"]').val() },
        success: function (data) {
            alert(data);
        },
        error: function (e) {
            alert('Error' + JSON.stringify(e));
        }
});

并将[FromBody]添加到您的操作中：

[HttpPost]
public async Task<IActionResult> SavePendingTest([FromBody]List<PendingTestResult> pendingTestResult)
{
    //...
}