Infragistics WebDataGrid DropDownList在回发中丢失状态

时间:2017-06-20 06:04:46

标签: asp.net drop-down-menu infragistics webdatagrid

我的TemplateDataField包含 WebDataGrid 中的 DropDownList 控件。 这个DropDownList绑定在WebDataGrid的行initialize事件中,每个post back Grid再次使用DataTable绑定,DataTable存储在一个视图状态,但是一个点复选框更改事件数据从数据库获取并绑定网格,直到一切正常。但是当我点击按钮(保存按钮从网格中获取所有数据并将其保存到数据库中)而不是在DropDownList中找不到任何项目时,那么这是什么问题?

所有控件都在“更新”面板中。

1 个答案:

答案 0 :(得分:0)

我有两个建议,在ItemTemplate创建而不是RowInitialize服务器事件上绑定列表,如果要动态创建模板,请使用Page_Init。

代码段:

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Init(object sender, EventArgs e)
    {
        TemplateDataField FreightField = new TemplateDataField();
        FreightField.ItemTemplate = new CustomTemplate();
        FreightField.VisibleIndex = 2;
        FreightField.Key = "Freight";

        TemplateDataField ShippedDateField = new TemplateDataField();
        ShippedDateField.ItemTemplate = new CustomTemplate2();
        ShippedDateField.VisibleIndex = 3;
        ShippedDateField.Key = "ShippedDate";

        if (this.WebDataGrid1.Columns.FromKey("Freight") != null)
        {
            ((TemplateDataField)this.WebDataGrid1.Columns["Freight"]).ItemTemplate = new CustomTemplate();
            ((TemplateDataField)this.WebDataGrid1.Columns["ShippedDate"]).ItemTemplate = new CustomTemplate2();

        }
        else
        {
            this.WebDataGrid1.Columns.Add(FreightField);
            this.WebDataGrid1.Columns.Add(ShippedDateField);
        }
    }

    protected void Page_Load(object sender, EventArgs e)
    {

    }
}

public class CustomTemplate : ITemplate
{
    public void InstantiateIn(Control container)
    {
        WebDropDown wdd = new WebDropDown();
        wdd.ID = "WebDropDown1";
        wdd.Width = Unit.Pixel(200);
        wdd.Items.Add(new DropDownItem("1", "1"));
        wdd.Items.Add(new DropDownItem("2", "2"));
        wdd.Items.Add(new DropDownItem("3", "3"));

        wdd.ClientEvents.SelectionChanged = "ctl00_WebDropDown1_SelectionChanged";

        container.Controls.Add(wdd);
    }

    protected void btn_Click(object sender, EventArgs e)
    {
        var temp = 0;
    }
}

public class CustomTemplate2 : ITemplate
{
    public void InstantiateIn(Control container)
    {
        WebDropDown wdd = new WebDropDown();
        wdd.ID = "WebDropDown2";
        wdd.Width = Unit.Pixel(200);
        wdd.Items.Add(new DropDownItem("4", "4"));
        wdd.Items.Add(new DropDownItem("5", "5"));
        wdd.Items.Add(new DropDownItem("6", "6"));


        container.Controls.Add(wdd);
    }
}