所以这是我班上的模特：
[Table("Question", Schema = "trs")]
public class Question
{
[Key]
public int QuestionId { get; set; }
[ForeignKey("TranType")]
[Required]
public int TranTypeId { get; set; }
[ForeignKey("Company")]
[Required]
public int CompanyId { get; set; }
[Required]
[StringLength(300)]
public string Text { get; set; }
[Required]
public bool IsActive { get; set; }
[ForeignKey("QuestionType")]
public int QTypeId { get; set; }
public DateTime CreatedDate { get; set; }
public string CreatedUserId { get; set; }
public DateTime UpdateDate { get; set; }
public string UpdateUserId { get; set; }
public Company Company { get; set; }
public QuestionType QuestionType { get; set; }
public TranType TranType { get; set; }
public ICollection<Answer> Answer { get; set; }
public ICollection<Grading> Grading { get; set; }
}
这是我的控制器操作，现在它什么也没做，因为我需要首先获取值，这是问题所在：
[Authorize(Roles = "Admin")]
public class QuestionController : Controller
{
readonly IQuestionRepository questionRepository;
readonly ICompanyRepository companyRepository;
public QuestionController(IQuestionRepository qRepository, ICompanyRepository cpnRepository)
{
questionRepository = qRepository;
companyRepository = cpnRepository;
}
[HttpPost]
public ActionResult Save([FromBody] List<Question> qView)
{
return View(qView);
}
}
现在我也试过了：
[HttpPost]
public ActionResult Save(List<Question> qView)
{
return View(qView);
}
在这两种情况下我都有问题;在第一个选项中（使用[FromBody]）qView为null;在选项2中（没有[FromBody]）qView不为null但List为空（Count == 0）。
以下是生成JSON数据的代码：
function Send()
{
var qCounter = parseInt($('#quesCounter').val());
var listQuestion = [];
var qView = {};
qView.Questions = listQuestion;
for (i = 1; i <= qCounter; i++)
{
var question = {};
var listAnswer = [];
question.Answers = listAnswer;
var anCounter = parseInt($('#qtCounter' + i).val());
var qText = $('#qtText' + i).val();
var qType = $('#qType' + i).val();
question["Text"] = qText;
question["QTypeId"] = qType;
for (j = 1; j <= anCounter; j++)
{
var answer = {};
var aText = $('#anText' + i.toString() + j.toString()).val();
var aCorrect = "";
if ($('#anCorrect' + i.toString() + j.toString()).prop('checked')) {
aCorrect = "yes";
}
else {
aCorrect = "no";
}
answer["Text"] = aText;
answer["IsCorrect"] = aCorrect;
question.Answers.push(answer);
}
qView.Questions.push(question);
}
$.ajax({
type: "POST",
url: "Save", // the method we are calling
contentType: "application/json",
data: JSON.stringify(qView),
//data: JSON.stringify({ 'qView': qView }),
dataType: "json",
success: function (result) {
alert('Yay! It worked!');
// Or if you are returning something
alert('I returned... ' + result.WhateverIsReturning);
},
error: function (result) {
alert('Oh no :(');
}
});
}
我不知道出了什么问题。
请知道我的问题在哪里？
答案 0 :(得分：1)
大家好，所以问题就是我以错误的方式调用ajax方法以及客户端映射中的一些属性;我通过这种方式运行方法来修复：
function Send()
{
var qCounter = parseInt($('#quesCounter').val());
var listQuestion = [];
for (i = 1; i <= qCounter; i++)
{
var question = {};
var listAnswer = [];
question.Answer = listAnswer; //Second problem was here because I was calling here the array Answers when the List<Answer> property on the server side was called Answer.
var anCounter = parseInt($('#qtCounter' + i).val());
var qText = $('#qtText' + i).val();
var qType = $('#qType' + i).val();
question["Text"] = qText;
question["QTypeId"] = parseInt(qType);// first problem was here because the property on the Server side was integer and I was sending string.
for (j = 1; j <= anCounter; j++)
{
var answer = {};
var aText = $('#anText' + i.toString() + j.toString()).val();
var aCorrect = "";
if ($('#anCorrect' + i.toString() + j.toString()).prop('checked')) {
aCorrect = 1; //third problem was here because true/yes was not recognize so I had to change to 1/0;.
}
else {
aCorrect = 0; //same as above (third problem).
}
answer["Text"] = aText;
answer["IsCorrect"] = aCorrect;
question.Answer.push(answer);
}
listQuestion.push(question);
}
$.ajax({
type: "POST",
url: "Save", // the method we are calling
contentType: "application/json",
data: JSON.stringify(listQuestion),
success: function (result) {
alert('worked');
},
error: function (result) {
alert('Something failed');
}
});
}
答案 1 :(得分：0)
您是将 contentType 设置为application/json，然后在发送之前字符串化您的数据？你刚才自相矛盾。
你基本上是在说：服务器，我发送给你一个JSON对象。但是，由于您对对象进行了字符串化，因此服务器只会看到一个字符串。这就是服务器无法将数据与模型匹配的原因。
只要您在客户端构建的JavaScript对象/ JSON与控制器参数中的模型匹配，您就不需要指定contentType和[FromBody] - 保持简单。 MVC非常聪明，可以为您进行绑定。您甚至不需要在C＃模型中使用小写来表示属性。您甚至可以使用true/false作为布尔值，只要C＃模型中的匹配属性定义为bool。
请勿在您的视图/页面上使用您的域/数据模型。创建一个单独的模型（称为视图模型），并在该视图/页面上仅显示您需要显示/使用的内容。您不希望将数据库中的内容公开给全世界。
请在JavaScript中使用 camelCase 获取变量和函数。你宣布function Send()，qView.Questions =和question.Answers.push(answer);的方式让我发疯了：p。
$.ajax({
type: 'POST',
// Use HTML helper to generate the link instead of hardcode.
// HTML helper will take care the host, port, and more for you.
url: '@Url.Action("save", "question", new { area = "" })',
// You usually don't need to specify the contentType.
// The default 'application/x-www-form-urlencoded' works well for
// JSON objects.
//contentType: "application/json",
// You don't need to stringify the data
data: { qView: qView },
//data: JSON.stringify({ 'qView': qView }),
dataType: "json",
success: function (result) {
alert('Yay! It worked!');
// Or if you are returning something
alert('I returned... ' + result.WhateverIsReturning);
},
error: function (result) {
alert('Oh no :(');
}
})
// I would use .done() here instead of success and error() but
// this is just personal taste.
;