javascript - 无法通过ajax查询获取值

Question

我使用.net core。有这样的类(class):

public class SentEmailItem
{
    public SentEmailItem()
    {
        Attachments = new List<AttachmentItem>();
    }


    public long PKID { get; set; }
    public string EmailTo { get; set; }
    public string EmailFrom { get; set; }
    public string Cc { get; set; }
    public string Bcc { get; set; }
    public string Body { get; set; }
    public string Subject { get; set; }

    public List<string> EmailToList => EmailTo.Split(" ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries).ToList();

    public List<string> CcList => (Cc ?? string.Empty).Split(" ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries).ToList();

    public List<string> BccList => (Bcc ?? string.Empty).Split(" ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries).ToList();

    public List<AttachmentItem> Attachments { get; set; }
}

Controller 中的这个方法:

[HttpPost]
public JsonResult SendEmail(SentEmailItem item)
{
    EmailHelper.SendEmailAsync(item);

    return SuccessJsonResult();
}

但是当通过以下代码从ajax调用此方法时:

    $.ajax({
    type: "POST",
    url: self.sendEmailUrl,
    contentType: "application/json",
    dataType: "json",
    data: JSON.stringify({ item: emaiItem })
}).done(function (json) {
    App.unblockUI();

    if (json.HasErrors) {
        var errorsHtml = $.map(json.Errors, function (x) { return "" + x.ErrorMessage + "<br/>"; }).join("");
        UIToastr.ShowMessage('error', 'Error', errorsHtml);
        return;
    }

    self.sendEmailCompleted(json);
});

我无法在 Controller 方法中获取数据。所有数据都有空值。但是在emaiItem中放置的js值看起来像:

Bcc : "Testmail@mail.com"
Body : "test body"
Cc : "Testmail@mail.com"
EmailFrom : "just3f@mail.com"
EmailTo : "Testmail@mail.com"
Subject : "Test subject"

Answer 1

看起来 emaiItem 已经是这样的对象 -

var emaiItem = {Bcc : "Testmail@mail.com",
Body : "test body",
Cc : "Testmail@mail.com",
EmailFrom : "just3f@mail.com",
EmailTo : "Testmail@mail.com",
Subject : "Test subject"};

如果是这样，它可以只使用JSON.stringify(emaiItem)。否则，您可以对上述 emaiItem 进行硬编码，并查看在服务器端填充的这些值。

$.ajax({
    ...
    data: JSON.stringify(emaiItem)
}).done(function (json) {
    ...
});

解决方案

替换为 JSON.stringify(emaiItem)，并使用 [FromBody] 属性强制模型绑定(bind)器绑定(bind)请求正文中的数据。

[HttpPost] 
public JsonResult SendEmail([FromBody]SentEmailItem item) 
{
}