可以使用帮助确定此处的500(内部服务器错误)的来源

我处理请求的方法是

    [HttpPost]
    public ActionResult SubmitNew ( SolutionSubmission SS )
    {
        // Going to move this to model later .. 
        using ( SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["LocalJsPracticeDb"].ConnectionString) )
        {
            SqlCommand cmd = new SqlCommand("AddSolution", con);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@problem_id", SS.ProblemId);
            cmd.Parameters.AddWithValue("@solver", SS.Solver);
            cmd.Parameters.AddWithValue("@solution_code", SS.SolutionCode);
            cmd.Parameters.AddWithValue("@test_code", SS.TestCode);
            /*
            cmd.Parameters.AddWithValue("@problem_id", 1);
            cmd.Parameters.AddWithValue("@solver", "Jeff");
            cmd.Parameters.AddWithValue("@solution_code", "<span>Hehe</span>");
            cmd.Parameters.AddWithValue("@test_code", "<p>Yo</p>"); */
            con.Open();
            cmd.ExecuteNonQuery();
        }
        return Json(new { success = true }) ; // TEST
    }
    // Going to move this to model later ...
    public class SolutionSubmission
    {
        public int ProblemId { get; set; }
        public string Solver { get; set; }
        public string SolutionCode { get; set; }
        public string TestCode { get; set; }
    }

我调用请求

        $('#submit-solution').click(function () {
            var rowData = {
                ProblemId : $('input[name="problem_id"]').val(),
                Solver : $('input[name="solver"]').val(),
                SolutionCode: $('#solution').html(),
                TestCode : $('#testfuncs').html()
            };
            console.log(rowData); // TEST
            $.ajax({
                url: 'SubmitNew',
                method: 'POST',
                data: rowData,
                success: function (retobj) {
                    // ... 
                },
                error: function ( ) {
                    // ... 
                }
            })
        });

我已经验证了rowData在我的测试用例中是有效的：它是（字符串化）

{"ProblemId":"1","Solver":"adas","SolutionCode":"'n'n        <div class='"CodeMirror cm-s-default'"><div style='"overflow: hidden; position: relative; width: 3px; height: 0px; top: 4px; left: 4px;'"><textarea autocorrect='"off'" autocapitalize='"off'" spellcheck='"false'" style='"position: absolute; padding: 0px; width: 1000px; height: 1em; outline: none;'" tabindex='"0'"></textarea></div><div class='"CodeMirror-vscrollbar'" cm-not-content='"true'"><div style='"min-width: 1px; height: 0px;'"></div></div><div class='"CodeMirror-hscrollbar'" cm-not-content='"true'"><div style='"height: 100%; min-height: 1px; width: 0px;'"></div></div><div class='"CodeMirror-scrollbar-filler'" cm-not-content='"true'"></div><div class='"CodeMirror-gutter-filler'" cm-not-content='"true'"></div><div class='"CodeMirror-scroll'" tabindex='"-1'"><div class='"CodeMirror-sizer'" style='"margin-left: 0px; margin-bottom: -23px; border-right-width: 7px; min-height: 48px; min-width: 253.208px; padding-right: 0px; padding-bottom: 0px;'"><div style='"position: relative; top: 0px;'"><div class='"CodeMirror-lines'"><div style='"position: relative; outline: none;'"><div class='"CodeMirror-measure'"><span><span>​</span>x</span></div><div class='"CodeMirror-measure'"></div><div style='"position: relative; z-index: 1;'"></div><div class='"CodeMirror-cursors'"><div class='"CodeMirror-cursor'" style='"left: 4px; top: 0px; height: 20px;'">&nbsp;</div></div><div class='"CodeMirror-code'"><pre class='" CodeMirror-line '"><span style='"padding-right: 0.1px;'"><span class='"cm-keyword'">function</span> <span class='"cm-def'">myScript</span>(){<span class='"cm-keyword'">return</span> <span class='"cm-number'">100</span>;}</span></pre><pre class='" CodeMirror-line '"><span style='"padding-right: 0.1px;'"><span cm-text='"'">​</span></span></pre></div></div></div></div></div><div style='"position: absolute; height: 7px; width: 1px; top: 48px;'"></div><div class='"CodeMirror-gutters'" style='"display: none; height: 308px;'"></div></div></div>","TestCode":"'n'n        <div class='"CodeMirror cm-s-default'"><div style='"overflow: hidden; position: relative; width: 3px; height: 0px; top: 4px; left: 4px;'"><textarea autocorrect='"off'" autocapitalize='"off'" spellcheck='"false'" style='"position: absolute; padding: 0px; width: 1000px; height: 1em; outline: none;'" tabindex='"0'"></textarea></div><div class='"CodeMirror-vscrollbar'" cm-not-content='"true'"><div style='"min-width: 1px; height: 0px;'"></div></div><div class='"CodeMirror-hscrollbar'" cm-not-content='"true'"><div style='"height: 100%; min-height: 1px; width: 0px;'"></div></div><div class='"CodeMirror-scrollbar-filler'" cm-not-content='"true'"></div><div class='"CodeMirror-gutter-filler'" cm-not-content='"true'"></div><div class='"CodeMirror-scroll'" tabindex='"-1'"><div class='"CodeMirror-sizer'" style='"margin-left: 0px; margin-bottom: -23px; border-right-width: 7px; min-height: 48px; min-width: 253.208px; padding-right: 0px; padding-bottom: 0px;'"><div style='"position: relative; top: 0px;'"><div class='"CodeMirror-lines'"><div style='"position: relative; outline: none;'"><div class='"CodeMirror-measure'"></div><div class='"CodeMirror-measure'"></div><div style='"position: relative; z-index: 1;'"></div><div class='"CodeMirror-cursors'"><div class='"CodeMirror-cursor'" style='"left: 4px; top: 0px; height: 20px;'">&nbsp;</div></div><div class='"CodeMirror-code'"><pre class='" CodeMirror-line '"><span style='"padding-right: 0.1px;'"><span class='"cm-keyword'">function</span> <span class='"cm-def'">myScript</span>(){<span class='"cm-keyword'">return</span> <span class='"cm-number'">100</span>;}</span></pre><pre class='" CodeMirror-line '"><span style='"padding-right: 0.1px;'"><span cm-text='"'">​</span></span></pre></div></div></div></div></div><div style='"position: absolute; height: 7px; width: 1px; top: 48px;'"></div><div class='"CodeMirror-gutters'" style='"display: none; height: 308px;'"></div></div></div>"}

但是，由于某种原因，我收到500（内部服务器错误）。当我替换时，我得到同样的错误

            /*
            cmd.Parameters.AddWithValue("@problem_id", SS.ProblemId);
            cmd.Parameters.AddWithValue("@solver", SS.Solver);
            cmd.Parameters.AddWithValue("@solution_code", SS.SolutionCode);
            cmd.Parameters.AddWithValue("@test_code", SS.TestCode);
            */
            cmd.Parameters.AddWithValue("@problem_id", 1);
            cmd.Parameters.AddWithValue("@solver", "Jeff");
            cmd.Parameters.AddWithValue("@solution_code", "<span>Hehe</span>");
            cmd.Parameters.AddWithValue("@test_code", "<p>Yo</p>"); 

因此，我的SubmitNew方法存在一些问题，与方法的主体无关。知道可能出了什么问题吗？

                dataType: 'json',
                processData: false,