如何将组合框添加到一个asp.net GridView控件绑定 [英] How to add a ComboBox to an asp.net unbound GridView

问题描述

我不知道我可以一个ComboBox列未绑定的GridView的通过code在运行时添加的

I wonder how I can add a ComboBox column to an unbound GridView through code at runtime.

推荐答案

编程方式：

我用下面的类（但下拉列表和复选框绑定），其中实现了Itemplate了过去。

I've used the following class (but for DropDown and CheckBox binding) in the past which implements ITemplate.

public class AddTemplateToGridView : ITemplate
{
    String columnName;

    public AddTemplateToGridView(String colname)
    {
        columnName = colname;
    }

    void ITemplate.InstantiateIn(System.Web.UI.Control container)
    {
        if (columnName == "yourField")
        {
            ComboBox cb = new ComboBox();
            cb.DataBinding += new EventHandler(cb_DataBinding);
            container.Controls.Add(cb);
        }
    }

    void cb_DataBinding(object sender, EventArgs e)
    {
        ComboBox cb = (ComboBox)sender;
        GridViewRow container = (GridViewRow)cb.NamingContainer; 
        Object dataValue = DataBinder.Eval(container.DataItem, columnName); 
        if (dataValue != DBNull.Value) 
        {
            // Assign ComboBox vals if necessary
            ... = dataValue
        }
    }
}

通过声明你的GridView和模板列在codebehind用途：

Use by declaring your GridView and TemplateField in the codebehind:

GridView newGrid = new GridView();
TemplateField field = new TemplateField();
field.HeaderText = "columnName";
field.ItemTemplate = // some item template
field.EditItemTemplate = new AddTemplateToGridView("yourField");
newGrid.Columns.Add(field);

或声明的：

<asp:GridView ID="GridView1" runat="server">  
<Columns>              
    <asp:TemplateField HeaderText="yourField">
        <ItemTemplate>
            <asp:Label runat="server" Text ='<%# Eval("yourField") %>' />
        </ItemTemplate>
        <EditItemTemplate>         
            <%--Your ComboBox--%>
        </EditItemTemplate>  
    </asp:TemplateField>
</Columns>
</asp:GridView>

希望这有助于。

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