ExceptionType：“System.FormatException”消息：“30/6/2019 不是 DateTime 的有效值。”

Question

我有两个 Ajax 请求。第一个从日期选择器获取日期并检查数据库日期。这工作正常。

第二个请求从日期选择器获取日期并检索该月的第一个日期和该月的最后一个日期。这会导致错误。

这里是 WebMethod：

[System.Web.Services.WebMethod]
public static string GetDateFromDB(DateTime compareDate)
{            
  string selectedDate = compareDate.ToString("yyyy/MM/dd");                           
  SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["LoginDBConnectionString1"].ConnectionString);

  // testing purpose
  SqlCommand com = new SqlCommand("SELECT * from Holiday where Date='" + selectedDate + "'", conn);           
  SqlDataAdapter sqlDa = new SqlDataAdapter(com);       
  DataTable dt = new DataTable();
  sqlDa.Fill(dt);

  if (dt == null || dt.Rows.Count == 0)
    return "NG";
  else
    return "OK";
}

[System.Web.Services.WebMethod]
public static string GetFirstDateAndLastDate(DateTime firstDayDate, DateTime lastDayDate, string ddlName)
{
  string firstDay = firstDayDate.ToString("yyyy/MM/dd");
  string lastDay = lastDayDate.ToString("yyyy/MM/dd");

  SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["LoginDBConnectionString1"].ConnectionString);

  // testing purpose
  SqlCommand com = new SqlCommand("SELECT sum([NumberOfHours]) FROM [LoginDB1].[dbo].[tbOT] where [Date] between Date =  + '" + firstDay + "' And Date =  + '" + lastDay + "' AND name =  + '" + ddlName + "'", conn);
  SqlDataAdapter sqlDa = new SqlDataAdapter(com);
  DataTable dt = new DataTable();
  sqlDa.Fill(dt);     

  return "NA";            
}

脚本就在下面：

jQuery(function($) {
  $("[id$=datepicker]").datepicker({
    onSelect: function(dateText) {
      $(this).change();
      $.ajax({
        type: "POST",
        url: "SupervisorOTRequest.aspx/GetDateFromDB",
        data: '{ "compareDate" : "' + dateText + '"}',
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function(response) {
          if (response.d == "OK") {
            alert("Today is Public Holiday!!!");
            $("[id$=txtOTRate]").val(1);
          } else if (response.d == "NG") {
            var date1 = $("[id$=datepicker]").datepicker('getDate');
            var day = date1.getDay();
            if (day == 1 || day == 2 || day == 3 || day == 4 || day == 5 || day == 6) {
              $("[id$=txtOTRate]").val(1.5);
            } else {
              $("[id$=txtOTRate]").val(2);
            }
          }
        }
      });

      var selectedDate = $("[id$=datepicker]").datepicker('getDate');
      //  var selectedDate = gg.getDate();
      //var selectedDate = $("[id$=datepicker]").val();
      var firstDay = new Date(selectedDate.getFullYear(), selectedDate.getMonth(), 1);
      var lastDay = new Date(selectedDate.getFullYear(), selectedDate.getMonth() + 1, 0);

      var firstDayWithSlashes = (firstDay.getDate()) + '/' + (firstDay.getMonth() + 1) + '/' + firstDay.getFullYear();
      var lastDayWithSlashes = (lastDay.getDate()) + '/' + (lastDay.getMonth() + 1) + '/' + lastDay.getFullYear();

      var data = {};
      data.fristDayDate = firstDayWithSlashes;
      data.lastDayDate = lastDayWithSlashes;
      data.ddlName = $("[id$=ddlName] option:selected").text();

      $.ajax({
        type: "POST",
        url: "SupervisorOTRequest.aspx/GetFirstDateAndLastDate",
        // data: '{ "fristDayDate" : "' + firstDayWithSlashes + '" + "lastDayDate" : "' + lastDayWithSlashes + '"}',
        data: JSON.stringify(data),
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function(response) {
          if (response.d == "NA") {
            $("[id$=txtRemainHour]").val();
          }
        }
      });
    },
  }).on("change", function() {});

  function display(msg) {
    $("<p>").html(msg).appendTo(document.body);
  }
});

当检查 Network > Headers > Request Payload 下的页面时，它会正确显示（如下）：

{fristDayDate: "1/6/2019", lastDayDate: "30/6/2019", ddlName: "Masrudin Bin A B Rahman"}
ddlName：“马斯鲁丁·宾·A·B·拉赫曼”
第一天日期：“2019 年 1 月 6 日”
lastDayDate：“2019 年 6 月 30 日”

但是在预览下，错误信息显示如下：

{消息：“30/6/2019 不是 DateTime 的有效值。”,…}
异常类型：“System.FormatException”
消息：“30/6/2019 不是 DateTime 的有效值。”
堆栈跟踪：“
在 System.ComponentModel.DateTimeConverter.ConvertFrom（ITypeDescriptorContext 上下文，CultureInfo 文化，对象值）
在 System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeInternal(Object o, Type type, JavaScriptSerializer 序列化器, Boolean throwOnError, Object&convertedObject)

在响应下，错误消息如下所示：

{"Message":"30/6/2019 不是 DateTime 的有效值。","StackTrace":"
在 System.ComponentModel.DateTimeConverter.ConvertFrom（ITypeDescriptorContext 上下文，CultureInfo 文化，对象值）
在 System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeInternal（对象 o，类型类型，JavaScriptSerializer 序列化程序，布尔 throwOnError，Object\u0026 转换对象）
在

Answer 1

卡里奥普，

试试这个

DateTime firstDay= DateTime.ParseExact(firstDayDate, "yyyy/MM/dd", new CultureInfo("en-US"));