DateTime.Parse或Convert.ToDateTime不起作用

问题描述：

我有一个带日历扩展程序的文本框。

I have a textbox with a calendar extender.

格式应如下：

<add key="DateFormat" value="dd/MM/yyyy"/>

我在aspx标记中具有以下内容

I have the following on my aspx markup

  <asp:TextBox ID="txt" runat="server" 
                        meta:resourcekey="txt" MaxLength="150" HtmlEncode="False"></asp:TextBox>
                        <ajaxToolkit:CalendarExtender runat="server"
                            TargetControlID="txt"
                                            PopupButtonID="Image1" Format="<%$Appsettings:DateFormat%>" />

我试图在类似这样的属性中使用它：

WHen I try to use it in a property like this:

datett= DateTime.Parse(txt.Text),

它表示FormatException。

It says FormatException.

我调试并尝试了Convert.ToDatetime，引发了同样的异常。

I debugged and also tried Convert.ToDatetime, same exception raised.

我正在测试的文本是2015年5月30日

The text I am testing is 30/05/2015

根据我在web.config中的格式，该文本应该可以正常工作。

which according to my format in my web.config should work fine.

update1
我使用以下代码根据用户选择来更改页面的语言和文化，这也许就是失败的原因

update1 I use the following code to change the language and culture of my page based on user selection, maybe this is why its failing,

我看到很多答案，第二个问题是如何获得当前的文化？

I see many answers, the 2nd question would be, how to get the current culture?

/// <summary>
        /// Handles the AcquireRequestState event of the Application control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
        protected void Application_AcquireRequestState(object sender, EventArgs e)
        {
            //Create culture info object 
            /*var ci = new CultureInfo(Session["Language"].ToString());
            System.Threading.Thread.CurrentThread.CurrentUICulture = ci;
            System.Threading.Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(ci.Name);*/

            System.Web.UI.Page p = (System.Web.HttpContext.Current.Handler as System.Web.UI.Page);
            if (p != null)
            {
                p.UICulture = p.Culture = new CultureInfo((string)Session["Language"]).Name;
            }
        }

答

您可以使用 DateTime.ParseExact 和/或明确地传递文化：

You could use DateTime.ParseExact and/or pass the culture explicitely:

var enCulture = new System.Globalization.CultureInfo("en-us");
DateTime result = DateTime.ParseExact("30/05/2015", 
                                      "dd/MM/yyyy", 
                                       enCulture );

编辑：如果您正在动态更改区域性并将其存储在会话，这应该可以工作：

Edit: If you're dynamically changing the culture and storing it in Session, this should work:

var userCulture = new System.Globalization.CultureInfo((string)Session["Language"]);
DateTime result = DateTime.Parse(TxtVehicleDestructionDateReturnedVehicle.Text, userCulture );

DateTime.Parse或Convert.ToDateTime不起作用

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