在使用 Newtonsoft 之后，ajax 调用在 asp.net 中返回 HTML 响应而不是 Json

Question

我正在使用 ajax 调用在我的 Ajax 代码之后使用 asp.net Web 表单绑定下拉索引更改事件的数据

var e = document.getElementById("<%=ddlEducation.ClientID%>");
                var value = e.options[e.selectedIndex].value;
                var text = e.options[e.selectedIndex].text;
                if (value == "0") {
                    $('#dvRecords').empty();
                    alert("Please Select Education");
                    return false;
                }

                var obj = { "iEduid": value};
                var myJSON = JSON.stringify(obj);
                //Filling Grid View  
                $.ajax({
                    type: 'POST',
                    contentType: "application/json; charset=utf-8",
                    url: 'EditProfile.aspx/BINDEducationDATA',
                    data: myJSON,
                    dataType: 'JSON',
                    success: function (response) {
                        document.getElementById("ctl00_ContentPlaceHolder2_lblstram").value = response.d[i].eduStream
                        document.getElementById("ctl00_ContentPlaceHolder2_lbldescs").value = response.d[i].Edu_Description
                    },
                    error: function (xhr, status, error) {
                        console.log(xhr);
                        alert(status);
                        alert(error);
                    }
                });

以上代码返回 HTML 响应而不是 JSON

我的 C# 代码

 [WebMethod]
    public static List<EduDesc> BINDEducationDATA(string iEduid)
    {
        List<EduDesc> details = new List<EduDesc>();
        DataTable dtManager = new DataTable();

        using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["constr"].ConnectionString))
        {
            SqlCommand cmd = new SqlCommand();
            SqlDataAdapter da = new SqlDataAdapter();
            cmd = new SqlCommand("Select Edu_Stream,Edu_Description from tbl_education WHERE ID='" + iEduid + "'", con);
            da.SelectCommand = cmd;
            da.Fill(dtManager);
        }

        foreach (DataRow dtrow in dtManager.Rows)
        {
            EduDesc logs = new EduDesc();
            logs.Edu_desc = (dtrow["Edu_Description"].ToString());
            logs.eduStream = dtrow["Edu_Stream"].ToString();
            details.Add(logs);
        }
        return details;
    }

我的班级

public class EduDesc
{
    public string Edu_desc { get; set; }
    public string iEduid { get; set; }
    public string eduStream { get; set; }
}

任何帮助将不胜感激。

Answer 1

您应该将[ScriptMethod(ResponseFormat = ResponseFormat.Json)] 添加到您的方法中

[WebMethod]
 [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
 public static List<EduDesc> BINDEducationDATA(string iEduid)
 {
}

Answer 2

包括

using Newtonsoft.Json;

并使用此更改脚本 WebMethod 属性：

[WebMethod, ScriptMethod(ResponseFormat = ResponseFormat.Json, UseHttpGet = false)]

你的 CS 应该是这样的：

[WebMethod, ScriptMethod(ResponseFormat = ResponseFormat.Json, UseHttpGet = false)]
public static List<EduDesc> BINDEducationDATA(string iEduid)
{
    List<EduDesc> details = new List<EduDesc>();
    DataTable dtManager = new DataTable();

    using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["constr"].ConnectionString))
    {
        SqlCommand cmd = new SqlCommand();
        SqlDataAdapter da = new SqlDataAdapter();
        cmd = new SqlCommand("Select Edu_Stream,Edu_Description from tbl_education WHERE ID='" + iEduid + "'", con);
        da.SelectCommand = cmd;
        da.Fill(dtManager);
    }

    foreach (DataRow dtrow in dtManager.Rows)
    {
        EduDesc logs = new EduDesc();
        logs.Edu_desc = (dtrow["Edu_Description"].ToString());
        logs.eduStream = dtrow["Edu_Stream"].ToString();
        details.Add(logs);
    }
    return JsonConvert.SerializeObject(details);
}