从 Ajax 对 MVC 控制器进行 HTTP Get 调用，参数是一个复杂的 Json 对象，显示为 null

Question

我有三门课

public class MainSearch
{
    public MainSearch()
    {
        SearchData searchData = new SearchData();
        SearchMode searchMode = new SearchMode();
    }
    public SearchData searchData { get; set; }
    public SearchMode searchMode { get; set; }
    public int? page { get; set; }
    public object ToPagedListParameters(int pagenumber)
    {
        searchMode.pageNumber = pagenumber;
        return page;
    }
    public IList<string> ValidationErrorMessages { get; set; }
}
public class SearchData
{
    // Fields used for the ticket number search
    public int? ticketNumberCompare { get; set; }
    public string ticketSearchTextFrom { get; set; }
    public string ticketSearchTextTo { get; set; }

}
public class SearchMode
{
    public int? mode { get; set; }
    public int? pageNumber { get; set; }
    public int? pageSize { get; set; }
    public string sortDirection { get; set; }
    public string sortField { get; set; }
    public string userURN { get; set; }
    public string __RequestVerificationToken { get; set; }
}

以下是我的控制器代码：

  [HttpGet]
public ActionResult DownloadFileCSV(MainSearch search)
{
    string fileName = Server.MapPath("~/Content/Pdf/") + "somefile.pdf";
    byte[] fileContents = System.IO.File.ReadAllBytes(fileName);
    return File(fileContents, "application/pdf", "result.pdf");
}

最后，从 cshtml 文件进行的 Ajax 调用。

  $("#DownloadAttachmentCSV").click(function () {
    $.ajax(
        {
            url: '@Url.Action("DownloadFileCSV", "Home")',
            contentType: 'application/json; charset=utf-8',
            datatype: 'json',
            data: JsonData,  
            type: "GET",
            success: function () {
                window.location = '@Url.Action("DownloadFileCSV", "Home")' + '?' + JsonData;                      
            },
            error: function (xhr, ajaxOptions, thrownError) {
                alert(xhr.status);
                alert(thrownError);
            }
        });
    });

上面的代码确实有效，并且下载了测试文件 somefile.pdf。

我的问题：

在控制器中，我期望 MainSearch 对象被填充。目前没有发生这种情况。检查类 SearchData 和 SearchMode 是否设置为 null。

我该如何解决这个问题？

抱歉，忘记添加 Json。

      var JsonData = {
            "searchMode":
                {
                    "mode": "1",
                    "pageSize": "5",
                    "pageNumber": "1",
                    "sortField": "PodRef",
                    "sortDirection": "desc",
                    "userURN": "3175",
                },
            "searchData":
                {
                    "ticketNumberCompare": "1",
                    "ticketSearchTextFrom": "From A",
                    "ticketSearchTextTo": "To Z"
                }
        };

Answer 1

将 JsonProperty 与两个 Model Like 一起使用：

public class SearchData
{
    [JsonProperty(PropertyName = "ticketNumberCompare")]
    public int? ticketNumberCompare { get; set; }
    [JsonProperty(PropertyName = "ticketSearchTextFrom")]
    public string ticketSearchTextFrom { get; set; }
    [JsonProperty(PropertyName = "ticketSearchTextTo")]
    public string ticketSearchTextTo { get; set; }
}

并使用视图模型 Like

public class JsonData
{
    public SearchMode SearchMode{get;set;}
    public SearchData SearchData {get;set;}
}

在行动中像这样使用

[HttpGet]
public ActionResult DownloadFileCSV(JsonData search)
{
    string fileName = Server.MapPath("~/Content/Pdf/") + "somefile.pdf";
    byte[] fileContents = System.IO.File.ReadAllBytes(fileName);
    return File(fileContents, "application/pdf", "result.pdf");
}