Error: String was not recognized as a valid DateTime. I'm using jquery datepicker with asp.net and c# web forms and sql databse

Question

我有一个文本框，其中 select 来自日期选择器的日期。然后我需要验证： 1. 日期 selected 2. date selected 不是未来的日期。只有今天的日期或任何以前的日期。 3. 当天正常加班时间不超过 20-24 小时。

我有一个错误"Error: String was not recognized as a valid DateTime."我已经花了几天时间解决这个问题，请问我能得到一些帮助吗？

C# 代码：

protected void btnCreate_click(object sender, EventArgs e)
    {
        try
        {
            DateTime dt = DateTime.ParseExact(DateTxt.Text, "MM/dd/yyyy", CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.AllowWhiteSpaces);

            if (DateTxt.Text != "" && PName_dd.Text != "" && CCG_dd.Text != "" && CCL_dd.Text != "")
            {

                cmd.CommandText = "INSERT INTO TSHistory(EmpId_Int, ProjectCode_Int, TSDate_dt, CCode_Int, TSRhours_nu, TSOhours_nu, JobDescp_vc) VALUES(@GEId, @Pcode, @date, @CCode, @Rhr, @Ohr, @job)";
                cmd.Parameters.AddWithValue("@GEId", EmpID.Text);

                cmd.Parameters.AddWithValue("@PCode", PCode_txt.Text);
                cmd.Parameters.AddWithValue("@date", dt);
                cmd.Parameters.AddWithValue("@CCode", CCL_dd.SelectedValue);
                cmd.Parameters.AddWithValue("@Rhr", R_txt.Text);
                cmd.Parameters.AddWithValue("@Ohr", O_txt.Text);
                cmd.Parameters.AddWithValue("@job", JobDesc_txt.Text);
                cmd.Parameters.AddWithValue("@Emp", EmpID.Text);
                cmd.Connection = Cnn;
                Cnn.Open();
                cmd.ExecuteNonQuery();
                Cnn.Close();
                updateUserDetails();
                // displayTS();
                RefreshSrc();
                RefreshDatabase();


            }

            else
            {


                //  DateTime dt = Convert.ToDateTime();
                //   var total_hrs = 24;
                //   DateTime dt = DateTime.ParseExact(DateTxt.Text, "MM/dd/yyyy", CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.AllowWhiteSpaces);
                //   global.Text = "Done";

                if (DateTxt.Text == "")

                {
                    // Response.Write("<script>alert('PLease select date');</script>");
                    //  dateError.Text = "PLease select date";
                    ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('Select date')", true);



                }


                else if (DateTxt.Text != "" && dt > DateTime.Today)

                {
                    // Response.Write("<script>alert('Invalid Date');</script>");
                    //  dateError.Text = "Invalid date";
                    ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('Invalid date')", true);


                }



            }




        }

       catch (Exception ex)
        {
            Response.Write("Error: " + ex.Message.ToString());
        }
    }

Aspx 代码：

 <div class="form-group col-sm-1">
   <asp:TextBox ID="DateTxt" placeholder="Date" CssClass="form-control" runat="server" 
                ReadOnly="True">
   </asp:TextBox>

Answer 1

由于您的文本仅包含日期部分，请按如下方式更改您的代码，

DateTime dt = DateTime.ParseExact(DateTxt.Text, "MM/dd/yyyy",CultureInfo.InvariantCulture);

Answer 2

我稍微更改了代码。请检查。

DateTime dt = DateTime.ParseExact(DateTxt.Text.Date, "MM/dd/yyyy HH:mm", CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.AllowWhiteSpaces);

Answer 3

设为只读="False"

如果 ReadOnly="True"，则无法更改 TextBox 控件的内容。这就是 DateTxt 文本值保持为空 ("") 并抛出错误的原因：字符串未被识别为有效的 DateTime .

Error: String was not recognized as a valid DateTime. I'm using jquery datepicker with asp.net and c# web forms and sql databse

Error: String was not recognized as a valid DateTime. I'm using jquery datepicker with asp.net and c# web forms and sql databse

c#

sql

asp.net

runtime-error

datetimepicker