Question

我尝试通过将Nested Repeater数据绑定到Generic List来填充Generic List。

用户可以随意添加/删除此Ajax Update Panel中的值所有这些都整齐地包裹在Generic List。

中

我现在遇到的问题是，当用户尝试向Generic List添加值时，它只会添加`初始值，然后在点击添加更多值时不断更新该值。

我怀疑它是因为public class challenge { public class Team { public string TeamName { get; set; } } public class Member:Team { public string Name { get; set; } } //This is just a test, but I cant get a list in a class file to work properly. public class ChallengeList { public List<Member> Member() { return null; } } }没有记录其初始数据或其他内容;但我真的不太确定。

请有人帮忙。

Chalenge.cs

private List<challenge.Member> Members = new List<challenge.Member>();

protected void Page_Load(object sender, EventArgs e)
{
    if (Page.IsPostBack) return;

    lblCurrent.Text = SiteSession.Current.Nickname;
    lblChallenge.Text = Request.QueryString["Challenge"];

    //Add the initial teams
    PopulateTeamRepeater();
    AddData();
}

private List<challenge.Member> AddData()
{
    Members.Add(
        new challenge.Member
            {
                Name = SiteSession.Current.Nickname,
                TeamName = "Team One"
            });
    Members.Add(
            new challenge.Member
                {
                    Name = Request.QueryString["Challenge"],
                    TeamName = "Team Two"
                });

    return Members;
}

/// <summary>
/// Add the selected member to the team
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void drpTeams_SelectedIndexChanged(object sender, EventArgs e)
{
    Members.Add(
        new challenge.Member
        {
            Name = tbMemberAuto.Text,
            TeamName = drpTeams.SelectedItem.Value
        });


    PopulateTeamRepeater();
}

Page.cs

 /// <summary>
    /// Populates the Team repeater control with the amount of teams the user has selected
    /// </summary>
    private void PopulateTeamRepeater()
    {


        ArrayList cArrayList = new ArrayList(); //Main holder
        StringBuilder sb = new StringBuilder(); //Temp holer

        try
        {

            //Get all team numbers
            foreach (challenge.Member Team in AddData())
            {
                //Add it to the string builder
                sb.Append(Team.TeamName + ";");
            }

            //Split the string to get the strings (As a temporary holder)
            string[] cs = sb.ToString().Split(';');

            //Add the groups (unique) to the next holder
            foreach (string s in cs.Where(s => !cArrayList.Contains(s)))
            {
                cArrayList.Add(s);
            }

            rptTeam.DataSource = cArrayList;
            rptTeam.DataBind();
        }
        catch (Exception es)
        {
            misc.ChangeInfo(Master.Page, "Error filling teams: " + es.Message, "ui-state-error");
        }
    }

/// <summary>
/// Populate the Member repeater based on the Team
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void rptTeam_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    Repeater rptMembers = (Repeater)e.Item.FindControl("rptMembers");
    Label lblTeam = (Label)e.Item.FindControl("lblTeam");

    rptMembers.DataSource = AddData().Where(m => m.TeamName == lblTeam.Text);
    rptMembers.DataBind();
}

更新：转发器的绑定（同一页面）

{{1}}

Answer 1

您可以将它们保持在视图状态：

const string cChalMemNameConst = "ChalMem_cnst";

public List<challenge.Member> Members
{
    get
    {
        if (!(ViewState[cChalMemNameConst] is List<challenge.Member>))
        {
            // need to fix the memory and added to viewstate
            ViewState[cChalMemNameConst] = new List<challenge.Member>();
        }

        return (List<challenge.Member>)ViewState[cChalMemNameConst];
    }
}

同时在您[Serializable]上添加List<>类的[Serializable] public class challenge { [Serializable] public class Team { public string TeamName { get; set; } } [Serializable] public class Member:Team { public string Name { get; set; } } [Serializable] public class ChallengeList { public List<Member> Member() { return null; } } }属性：

private List<challenge.Member> Members = new List<challenge.Member>();

注意：必须通过以上语句将行{{1}}更改为将其保存到viewstate。

如何在回发后将数据保存在通用列表中

1 个答案: