错误仅在主机上，而不是在我的计算机上；字符串未被识别为有效的日期时间

Question

我的处境很糟糕。我有一个程序，它在我的电脑上工作得很好，但是当我把它上传到主机上时，它给了我这个错误 "String was not recognized as a valid DateTime." 我的程序在 ASP.net C# visual studio 2015

Edit: both date's format on my computer and on the host are the same. like this:"mm/dd/yyyy"

你能帮帮我吗？这是我的代码： HTML:

<%@ Page Title="" Language="C#" MasterPageFile="~/mainMembers/frameMembers.Master" AutoEventWireup="true" CodeBehind="GMList.aspx.cs" Inherits="Federation.mainMembers.GMList" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainFrame" runat="server">
    <form id="gml" runat="server" method="post">
        <asp:Label ID="titr" runat="server" CssClass="shekaste" Text="title"></asp:Label>
        <br />
        <br />
         <div  runat="server"  style="height: 400px; width:800px; overflow: scroll">
        <asp:GridView ID="fedList" runat="server" AutoGenerateColumns="false" CssClass="parastoo" OnRowDataBound="MatchList_RowDataBound" >
            <Columns>
                
                
                <asp:BoundField HeaderText="a" DataField="birthday" />
                
                <asp:BoundField HeaderText="b" DataField="start_sport" />
                
                <asp:BoundField HeaderText="c" DataField="ToDate" />
               
                
            </Columns>
        </asp:GridView>
            </div>
        </form>
</asp:Content>

C#代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
using System.Configuration;
using System.Globalization;
using System.Drawing;
using System.Text.RegularExpressions;
using System.IO;

namespace Federation.mainMembers
{

    public partial class GMList : System.Web.UI.Page
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["NSG"].ConnectionString);
        //SqlConnection con = new SqlConnection(conStr);
        DataSet ds = new DataSet();
        //private string strSQL;
        private SqlCommand com;
        SqlDataAdapter sda;
        // DateTime dtime;
        DataTable dt = new DataTable();
        //DataTable dt1 = new DataTable();
        PersianCalendar pc = new PersianCalendar();
        //string memberID = "1111111112";
        string matchID = "";
        Boolean[] age2 = new Boolean[6];
        Boolean[] weight = new Boolean[9];
        //Int16 morshedi = 0;
        byte[] img1 = new byte[0];

        Int16 level;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Session["FID"] != null)
            {
                matchID = this.Session["FID"].ToString();
                //memberID = this.Session["VID"].ToString();
                //morshedi = Convert.ToInt16(this.Session["VMID"].ToString());

                //string s;

                if (!Page.IsPostBack)
                {


                    //********************************************************
                    dt.Rows.Clear();
                    con.Close();
                    sda = new SqlDataAdapter("select birthday,start_sport,ToDate   from general_members ", con);
                    con.Close();

                    con.Open();
                    dt.Rows.Clear();
                    sda.Fill(dt);

                    con.Close();
                    //string dds=dt.Rows[0]["ToDate"].ToString();
                    DataView dv1 = new DataView(dt);

                    fedList.DataSource = dv1;

                    fedList.DataBind();


                }
            }
            else
            {
                Response.Redirect("~/a.aspx");
            }


        }

        protected void MatchList_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                // Find the value in the c04_oprogrs column. You'll have to use
                // some trial and error here to find the right control. The line
                // below may provide the desired value but I'm not entirely sure.

                TableCell statusCell1 = e.Row.Cells[0];
                TableCell statusCell2 = e.Row.Cells[1];
                TableCell statusCell3 = e.Row.Cells[2];

                string dstr = "";
                int year, month, day;
                year = Convert.ToInt32(pc.GetYear(Convert.ToDateTime(statusCell1.Text)));
                month = Convert.ToInt32(pc.GetMonth(Convert.ToDateTime(statusCell1.Text)));
                day = Convert.ToInt32(pc.GetDayOfMonth(Convert.ToDateTime(statusCell1.Text)));
                dstr = year.ToString() + "/" + month.ToString() + "/" + day.ToString();
                statusCell1.Text = dstr;

                year = Convert.ToInt32(pc.GetYear(Convert.ToDateTime(statusCell2.Text)));
                month = Convert.ToInt32(pc.GetMonth(Convert.ToDateTime(statusCell2.Text)));
                day = Convert.ToInt32(pc.GetDayOfMonth(Convert.ToDateTime(statusCell2.Text)));
                dstr = year.ToString() + "/" + month.ToString() + "/" + day.ToString();
                statusCell2.Text = dstr;

                year = Convert.ToInt32(pc.GetYear(Convert.ToDateTime(statusCell3.Text)));
                month = Convert.ToInt32(pc.GetMonth(Convert.ToDateTime(statusCell3.Text)));
                day = Convert.ToInt32(pc.GetDayOfMonth(Convert.ToDateTime(statusCell3.Text)));
                dstr = year.ToString() + "/" + month.ToString() + "/" + day.ToString();
                statusCell3.Text = dstr;


            }
        }
    }
}

Answer 1

问题很可能是您主机上的不同区域设置。

要解决此问题，请确保将预期的 CultureInfo 传递给您的转换方法：

https://msdn.microsoft.com/en-us/library/9xk1h71t(v=vs.110).aspx

见下文，已应用于您的代码。您需要在 CultureInfo 构造函数中替换相关的文化字符串：

System.Globalization.CultureInfo culture = new System.Globalization.CultureInfo("en-US");

year = Convert.ToInt32(pc.GetYear(Convert.ToDateTime(statusCell1.Text,culture)));
month = Convert.ToInt32(pc.GetMonth(Convert.ToDateTime(statusCell1.Text,culture)));
day = Convert.ToInt32(pc.GetDayOfMonth(Convert.ToDateTime(statusCell1.Text,culture)));

Answer 2

我注意到在您代码的 c# 部分，您使用了 Convert.ToDateTime(string) 重载。如果您正在使用它，那么您传递的字符串将使用您运行此代码所在机器的区域设置进行转换。因此，最可能的原因是您的本地机器和主机的区域设置不同。

您可以尝试两种方法：

将您计算机上的区域设置更改为主机上的区域设置。很可能错误也会出现在您的本地系统上。
尝试使用重载Convert.ToDateTime(string, IFormatProvider)。这将确保转换始终以相同的方式执行，无论您的本地设置如何。

Answer 3

如果从 Sql 返回的数据是日期时间（数据类型是日期时间），那么您可以直接在 Gridview 中为日期列设置日期格式，如下所示：

<asp:BoundField HeaderText="Birth Date" DataField="birthday" DataFormatString="{0:yyyy/MM/dd}" HtmlEncode="false" >

并从所有日期列的 RowDataBound 事件中删除以下代码

            int year, month, day;
            year = Convert.ToInt32(pc.GetYear(Convert.ToDateTime(statusCell1.Text)));
            month = Convert.ToInt32(pc.GetMonth(Convert.ToDateTime(statusCell1.Text)));
            day = Convert.ToInt32(pc.GetDayOfMonth(Convert.ToDateTime(statusCell1.Text)));
            dstr = year.ToString() + "/" + month.ToString() + "/" + day.ToString();
            statusCell1.Text = dstr;

错误仅在主机上，而不是在我的计算机上；字符串未被识别为有效的日期时间

Error just on host, not on my computer; String was not recognized as a valid DateTime

c#

asp.net

visual-studio-2015

host