Question

我有一个要求，我必须根据开始日期和结束日期删除下拉项目。我已经足够搜索并尝试了许多简单的方法，例如我可以删除下拉列表中的所选项目。这里的问题是，它抛出错误，输入字符串格式不正确以及如何从下拉列表中跟踪和删除项目。请注意，下拉值从日历列表开始绑定，并且已经显示在自定义列表中作为下拉列表（希望很清楚）。

以下是我的代码：

protected void BtnRegister_Click(object sender, EventArgs e)
{
    try
    {
        SPSite oSPSiteCollection = SPContext.Current.Site;
        SPWeb oSPWeb = SPContext.Current.Web;
        SPList oSPList = oSPWeb.Lists["Registered"];
        SPListItemCollection oSPListItemCollection = oSPList.Items;
        SPListItem oSPListItem = oSPListItemCollection.Add();
        DataTable oDataTable = new DataTable();
        oSPListItem["Employee Name"] = oSPWeb.CurrentUser.Email.ToString();
        string[] UsersSeperated = peopleEditorManager.CommaSeparatedAccounts.Split(',');
        SPFieldUserValueCollection UserCollection = new SPFieldUserValueCollection();
        SPFieldUserValue UserName = new SPFieldUserValue();
        foreach (string UserSeperated in UsersSeperated)
        {
            oSPWeb.EnsureUser(UserSeperated);
            SPUser User = oSPWeb.SiteUsers[UserSeperated];
            UserName = new SPFieldUserValue(oSPWeb, User.ID, User.LoginName);
            UserCollection.Add(UserName);
        }
        oSPListItem["peopleEditorManager"] = UserCollection;
        oSPListItem["Practice Name"] = TxtPracticeName.Text;
        oSPListItem["Course Name"] = ddlDrop.SelectedItem;
        oSPListItem["Prerequisite"] = TxtPrerequisite1.Text;
        oSPListItem["Beg Date"] = TxtStartDate.Text;
        oSPListItem["Finish Date"] = TxtEndDate.Text;
        string registeredCourse = oSPListItem["Course Name"].ToString();
        SPList oSPListCourse = oSPWeb.Lists["Scheduled Courses"];
        SPListItemCollection oSPListItemCollectionCourse = oSPListCourse.Items;
        foreach (SPListItem oSPListItemCourse in oSPListItemCollectionCourse)
        {
            string begginingDate = oSPListItemCourse["Start Date"].ToString();
            string finishDate = oSPListItemCourse["End Date"].ToString();
            //input string not in correct format
            if (( Convert.ToInt32(begginingDate) >= Convert.ToInt32(TxtStartDate.Text) ) 
                || (Convert.ToInt32(finishDate) <= Convert.ToInt32(TxtEndDate.Text))) 
            {
                //how to remove the item from drop down if their date is greater than StartDate and less than EndDate
                ddlDrop.Items.Remove(ddlDrop.SelectedItem);
            }
        }  
        oSPListItem.Update();
        LblMessage.Text = "Registeres";
        String fromID = oSPWeb.CurrentUser.Email.ToString();
        String mailTo = UserName.User.Email.ToString();
        string titleName = ddlDrop.SelectedItem.ToString();
        SendEmail_WU(fromID, mailTo, titleName);
    }
    catch (Exception ex)
    {
        LblMessage.Text = ex.Message;
    }
}

请帮忙。谢谢。

Answer 1

根据您的评论：

如果日期大于StartDate且小于EndDate，则如何从下拉列表中删除该项目

听起来你应该使用Convert.ToDateTime或DateTime.Parse而不是Convert.ToInt32。

此外，您的评论中写着“和”，但代码中的||表示“或”。你的病情的左右两侧需要翻转。

以下代码应实现您的评论所表达的内容：

//input string not in correct format
if ((Convert.ToDateTime(TxtStartDate.Text) > Convert.ToDateTime(begginingDate)) 
    && (Convert.ToDateTime(TxtEndDate.Text) < Convert.ToDateTime(finishDate))) 
{
    // how to remove the item from drop down if their date is 
    // greater than StartDate and less than EndDate
    ddlDrop.Items.Remove(ddlDrop.SelectedItem);
}

如果这不符合您的要求，那么您需要重新审视您的要求。

输入字符串的格式不正确，并从下拉列表中删除下拉项

1 个答案: