在“位置0的json中出现意外的令牌u”时遇到问题

Question

我正在通过以下代码将DataTable转换为JSON：

public string DataTableToJSONWithJSONNet(DataTable table)
{
    string JSONString = string.Empty;
    JSONString = JsonConvert.SerializeObject(table);
    return JSONString;
}

问题似乎是这没有返回正确的JSON。 JSONString的值为：

"{\"DataTable.RemotingVersion\":{\"Major\":2,\"Minor\":0,\"Build\":-1,\"Revision\":-1,\"MajorRevision\":-1,\"MinorRevision\":-1},\"XmlSchema\":\"<?xml version=\\\"1.0\\\" encoding=\\\"utf-16\\\"?>\\r\\n<xs:schema xmlns=\\\"\\\" xmlns:xs=\\\"http://www.w3.org/2001/XMLSchema\\\" xmlns:msdata=\\\"urn:schemas-microsoft-com:xml-msdata\\\">\\r\\n  <xs:element name=\\\"Table1\\\">\\r\\n    <xs:complexType>\\r\\n      <xs:sequence>\\r\\n        <xs:element name=\\\"ID\\\" type=\\\"xs:int\\\" msdata:targetNamespace=\\\"\\\" minOccurs=\\\"0\\\" />\\r\\n        <xs:element name=\\\"ImageURL\\\" type=\\\"xs:string\\\" msdata:targetNamespace=\\\"\\\" minOccurs=\\\"0\\\" />\\r\\n        <xs:element name=\\\"Price\\\" type=\\\"xs:decimal\\\" msdata:targetNamespace=\\\"\\\" minOccurs=\\\"0\\\" />\\r\\n        <xs:element name=\\\"Description\\\" type=\\\"xs:string\\\" msdata:targetNamespace=\\\"\\\" minOccurs=\\\"0\\\" />\\r\\n        <xs:element name=\\\"UploadDate\\\" type=\\\"xs:dateTime\\\" msdata:targetNamespace=\\\"\\\" minOccurs=\\\"0\\\" />\\r\\n        <xs:element name=\\\"ExpDate\\\" type=\\\"xs:dateTime\\\" msdata:targetNamespace=\\\"\\\" minOccurs=\\\"0\\\" />\\r\\n        <xs:element name=\\\"Status\\\" type=\\\"xs:string\\\" msdata:targetNamespace=\\\"\\\" minOccurs=\\\"0\\\" />\\r\\n      </xs:sequence>\\r\\n    </xs:complexType>\\r\\n  </xs:element>\\r\\n  <xs:element name=\\\"tmpDataSet\\\" msdata:IsDataSet=\\\"true\\\" msdata:MainDataTable=\\\"Table1\\\" msdata:UseCurrentLocale=\\\"true\\\">\\r\\n    <xs:complexType>\\r\\n      <xs:choice minOccurs=\\\"0\\\" maxOccurs=\\\"unbounded\\\" />\\r\\n    </xs:complexType>\\r\\n  </xs:element>\\r\\n</xs:schema>\",\"XmlDiffGram\":\"<diffgr:diffgram xmlns:msdata=\\\"urn:schemas-microsoft-com:xml-msdata\\\" xmlns:diffgr=\\\"urn:schemas-microsoft-com:xml-diffgram-v1\\\">\\r\\n  <tmpDataSet>\\r\\n    <Table1 diffgr:id=\\\"Table11\\\" msdata:rowOrder=\\\"0\\\">\\r\\n      <ID>1</ID>\\r\\n      <ImageURL>https://i.imgur.com/S59HjAe.jpg </ImageURL>\\r\\n      <Price>123.0000</Price>\\r\\n      <Description>123</Description>\\r\\n      <UploadDate>2019-04-19T08:30:56.913-05:00</UploadDate>\\r\\n      <ExpDate>1900-01-01T00:00:00-06:00</ExpDate>\\r\\n      <Status>New</Status>\\r\\n    </Table1>\\r\\n  </tmpDataSet>\\r\\n</diffgr:diffgram>\"}"

据我了解，结果不应包含该字符串开头的大部分内容（修订，XML Schema，列的数据类型等）。

任何人都可以解释为什么在转换DT后我还能获得更多信息吗？我相信其他信息会导致“位置0的json中出现意外的令牌u”错误。感谢您的帮助。

编辑：利用此功能的javascript代码是：

function GetItemsList() {
    try {
        $('#Products').html('');
        var items = '';
        document.getElementById("Products").innerHTML = ""
        var i = 0;

        $.ajax({
            type: "GET",
            url: '/Home/UseGetItems',
            contentType: "application/json; charset=utf-8",
            success: function (result) {
                var ItemData = JSON.parse(result.Data);

                if (ItemData.length > 0) {
                    for (i; i < ItemData.length; i++) {
                        document.getElementById("Products").innerHTML += '<div class="w3 - col l3 s6"><div class="w3 - container"><img src="' + ItemData[i].ImageURL + '" style="width:100%"><p>' + ItemData[i].Description + '<br><b>' + ItemData[i].Price + '</b></p></div></div>';
                    }
                    $('#Products').append(items);
                }
            },
        });

    } catch (e) {

    }
}

编辑2：其余的C＃是：

public ActionResult UseGetItems()

{
    jsonMessage result = new jsonMessage();

    var ItemsList = GetItems();

    return Json(new
    {
        Data = ItemsList,
        result = true,
    });

}

public string GetItems()
{
    var Items = string.Empty;

    try
    {
        DataTable dt = new DataTable();
        string Connection = "Data Source=TEST; Initial Catalog=TEST;Persist Security Info=True;User ID=TEST;Password=TEST"; //ConfigurationManager.ConnectionStrings["testConn"].ConnectionString;
        string Query = "SELECT * FROM [TEST] WHERE [Status] <> 'CLOSED'";

        using (SqlConnection conn = new SqlConnection(Connection))
        {
            conn.Open();
            SqlCommand cmd = new SqlCommand(Query, conn)
            {
                CommandType = CommandType.Text
            };
            //cmd.Parameters.Add(new SqlParameter("@this", "value"));
            cmd.ExecuteNonQuery();
            SqlDataAdapter dataAdapter = new SqlDataAdapter(cmd);
            dataAdapter.Fill(dt);
            conn.Close();
        };
        Items = DataTableToJSONWithJSONNet(dt);
    }
    catch (Exception ex)
    {
        throw new Exception(ex.Message);
    }

    return Items;
}

@briosheje console.log(result);的结果是

Object
data: "{"DataTable.RemotingVersion":{"Major":2,"Minor":0,"Build":-1,"Revision":-1,"MajorRevision":-1,"MinorRevision":-1},"XmlSchema":"<?xml version=\"1.0\" encoding=\"utf-16\"?>\r\n<xs:schema xmlns=\"\" xmlns:xs=\"http://www.w3.org/2001/XMLSchema\" xmlns:msdata=\"urn:schemas-microsoft-com:xml-msdata\">\r\n  <xs:element name=\"Table1\">\r\n    <xs:complexType>\r\n      <xs:sequence>\r\n        <xs:element name=\"ID\" type=\"xs:int\" msdata:targetNamespace=\"\" minOccurs=\"0\" />\r\n        <xs:element name=\"ImageURL\" type=\"xs:string\" msdata:targetNamespace=\"\" minOccurs=\"0\" />\r\n        <xs:element name=\"Price\" type=\"xs:decimal\" msdata:targetNamespace=\"\" minOccurs=\"0\" />\r\n        <xs:element name=\"Description\" type=\"xs:string\" msdata:targetNamespace=\"\" minOccurs=\"0\" />\r\n        <xs:element name=\"UploadDate\" type=\"xs:dateTime\" msdata:targetNamespace=\"\" minOccurs=\"0\" />\r\n        <xs:element name=\"ExpDate\" type=\"xs:dateTime\" msdata:targetNamespace=\"\" minOccurs=\"0\" />\r\n        <xs:element name=\"Status\" type=\"xs:string\" msdata:targetNamespace=\"\" minOccurs=\"0\" />\r\n      </xs:sequence>\r\n    </xs:complexType>\r\n  </xs:element>\r\n  <xs:element name=\"tmpDataSet\" msdata:IsDataSet=\"true\" msdata:MainDataTable=\"Table1\" msdata:UseCurrentLocale=\"true\">\r\n    <xs:complexType>\r\n      <xs:choice minOccurs=\"0\" maxOccurs=\"unbounded\" />\r\n    </xs:complexType>\r\n  </xs:element>\r\n</xs:schema>","XmlDiffGram":"<diffgr:diffgram xmlns:msdata=\"urn:schemas-microsoft-com:xml-msdata\" xmlns:diffgr=\"urn:schemas-microsoft-com:xml-diffgram-v1\">\r\n  <tmpDataSet>\r\n    <Table1 diffgr:id=\"Table11\" msdata:rowOrder=\"0\">\r\n      <ID>1</ID>\r\n      <ImageURL>https://i.imgur.com/S59HjAe.jpg </ImageURL>\r\n      <Price>123.0000</Price>\r\n      <Description>123</Description>\r\n      <UploadDate>2019-04-19T08:30:56.913-05:00</UploadDate>\r\n      <ExpDate>1900-01-01T00:00:00-06:00</ExpDate>\r\n      <Status>New</Status>\r\n    </Table1>\r\n  </tmpDataSet>\r\n</diffgr:diffgram>"}"
result: true
__proto__: Object

编辑3：如果我将C＃更改为要返回的DT（而不是在那里进行序列化），则如下所示：

public DataTable GetItems()
{
    DataTable Items;

    try
    {
        DataTable dt = new DataTable();
        string Connection = "Data Source=TEST; Initial Catalog=TEST;Persist Security Info=True;User ID=TEST;Password=TEST"; //ConfigurationManager.ConnectionStrings["testConn"].ConnectionString;
        string Query = "SELECT * FROM [TEST] WHERE [Status] <> 'CLOSED'";

        using (SqlConnection conn = new SqlConnection(Connection))
        {
            conn.Open();
            SqlCommand cmd = new SqlCommand(Query, conn)
            {
                CommandType = CommandType.Text
            };
            //cmd.Parameters.Add(new SqlParameter("@this", "value"));
            cmd.ExecuteNonQuery();
            SqlDataAdapter dataAdapter = new SqlDataAdapter(cmd);
            dataAdapter.Fill(dt);
            conn.Close();
        };
        Items = dt;
    }
    catch (Exception ex)
    {
        throw new Exception(ex.Message);
    }

    return Items;
}

然后var ItemData = JSON.parse(result.data);的结果给出错误：

Unexpected token o in JSON at position 1

编辑4：

    public class jsonMessage
    {
        public string Message { get; set; }
        public string MessageList { get; set; }
        public bool Status { get; set; }
    }