为ASPxComboBox 控件动静态绑定下拉项的方法

1定义提供数据源的方法：protected IEnumerable GetParentRoleDataSource(object categoryId)
{
IEnumerable results = from r2 in eDataContext.Role
where r2.IsDeleted == false
select new { ParentRoleID = r2.RoleID, ParentRoleName = r2.RoleName };

return results;
}

2. 页面绑定数据源和键值，并且用value关联好

<dxe:ASPxComboBox ID="parentRoleComb" runat="server" Value='<%# Eval("ParentRoleID")%>' ValueField="ParentRoleID" TextField="ParentRoleName"

DataSource='<%# GetParentRoleDataSource(Eval("ParentRoleID")) %>' ValueType="System.Int32">

</dxe:ASPxComboBox>

3.在ASPxGridView1_HtmlEditFormCreated事件中为下拉框绑定顶级角色的值： ASPxComboBox currentBox = ((ASPxGridView)sender).FindEditFormTemplateControl("parentRoleComb") as ASPxComboBox;

//给DropDownList手动添加显示值（包括对应的后台值）
ListEditItem item = new ListEditItem("没有父角色", "0");

currentBox.Items.Insert(0, item); //把值添加到指定的索引位置