Question

我在将数据写入类字段时遇到问题。我声明了字段“ rcbSelection”，然后在Page_load（）中对其进行了初始化。然后，我尝试在一些组合框SelectionChangedEvents中向其中添加数据。

public partial class AddToProcurementPlan : Page
{
    Dictionary<string, int?> rcbSelection;
    protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
            rcbSelection = new Dictionary<string, int?>();
            /*other code*/
        }
     }

    protected void rcb_FinancingBudget_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)
    {
        RadComboBox rcb = (RadComboBox)sender;
        if (rcbSelection.ContainsKey("financingbudget"))
            rcbSelection["financingbudget"] = int.Parse(rcb.SelectedValue);
        else
            rcbSelection.Add("financingbudget", int.Parse(rcb.SelectedValue));
    }

    protected void rcb_BudgetName_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)
    {
        RadComboBox rcb = (RadComboBox)sender;
        if (rcbSelection.ContainsKey("budget"))
            rcbSelection["budget"] = int.Parse(rcb.SelectedValue);
        else
            rcbSelection.Add("budget", int.Parse(rcb.SelectedValue));
    }

    protected void rcb_FondName_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)
    {
        RadComboBox rcb = (RadComboBox)sender;
        if (rcbSelection.ContainsKey("fond"))
            rcbSelection["fond"] = int.Parse(rcb.SelectedValue);
        else
            rcbSelection.Add("fond", int.Parse(rcb.SelectedValue));
    }

    protected void rcb_Kfkr_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)
    {
        RadComboBox rcb = (RadComboBox)sender;
        if (rcbSelection.ContainsKey("kfk"))
            rcbSelection["kfk"] = int.Parse(rcb.SelectedValue);
        else
            rcbSelection.Add("kfk", int.Parse(rcb.SelectedValue));
    }

    protected void rcb_Kekr_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)
    {
        RadComboBox rcb = (RadComboBox)sender;
        if (rcbSelection.ContainsKey("kekr"))
            rcbSelection["kekr"] = int.Parse(rcb.SelectedValue);
        else
            rcbSelection.Add("kekr", int.Parse(rcb.SelectedValue));
    }

    protected void rcb_BudgetExec_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)
    {
        RadComboBox rcb = (RadComboBox)sender;
        if (rcbSelection.ContainsKey("budgetexec"))
            rcbSelection["budgetexec"] = int.Parse(rcb.SelectedValue);
        else
            rcbSelection.Add("budgetexec", int.Parse(rcb.SelectedValue));
    }

    protected void rcb_SectionCode_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)
    {
        RadComboBox rcb = (RadComboBox)sender;
        if (rcbSelection.ContainsKey("section"))
            rcbSelection["section"] = int.Parse(rcb.SelectedValue);
        else
            rcbSelection.Add("section", int.Parse(rcb.SelectedValue));
    }

    protected void rcb_TargetArticle_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)
    {
        RadComboBox rcb = (RadComboBox)sender;
        if (rcbSelection.ContainsKey("targetarticle"))
            rcbSelection["targetarticle"] = int.Parse(rcb.SelectedValue);
        else
            rcbSelection.Add("targetarticle", int.Parse(rcb.SelectedValue));
    }
}

但是当我在上一个事件上设置停止点时，我可以看到rcbSelection为空。我做错了什么？请帮助我。

Answer 1

我怀疑您的rcbSelection字典在您的SelectedIndexChanged事件的回发之后将被重置，因为该字典没有持久保存在诸如ViewState之类的内存中。

考虑将rcbSelection词典持久保存为...


        private Dictionary<string, int?> rcbSelection
        {
            get
            {
                if(this.ViewState["rcbSelection"] != null)
                {
                    return (Dictionary<string, int?>)this.ViewState["rcbSelection"];
                }

                return new Dictionary<string, int?>();
            }

            set
            {
                this.ViewState["rcbSelection"] = value;
            }
        }

在page_load事件中，如果您不希望在每次回发后重设字典，请考虑从page_load函数中删除rcbSelection = new Dictionary<string, int?>();或通过检查它是否是第一页加载来仅初始化一次... < / p>

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!this.IsPostBack)
            {
                rcbSelection = new Dictionary<string, int?>();
            }

            // other postback code here ... 
        }

希望有帮助。

组合框SelectionChangedEvent不写入类字段

1 个答案: