ASP.NET:可以使用GridView创建层次结构吗？

Question

我们在项目的某些页面中使用GridView控件,我们不想大幅改变,是否可以在gridview中创建层次结构？这可以通过在Gridview中使用GridView来获得父子关系来实现吗？

Answer 1

是的,你可以,而且很容易......

最好的方法是有一些ObjectDataSource,以便整个过程对你来说更容易,或者当然,你可以在paraent gridview OnRowDataBound事件中绑定nasted gridview,这完全取决于你:)

例:

<asp:GridView ID="gvGrandFather" runat="server" DataSourceID="odsGrandFather">
    <Columns>
        <asp:BoundField DataField="myField1" HeaderText="myText1" />
        <asp:BoundField DataField="myField2" HeaderText="myText2" />
        <asp:BoundField DataField="myField3" HeaderText="myText3" />
        <asp:TemplateField>
            <ItemTemplate>
                <asp:GridView ID="gvFather" runat="server" DataSourceID="odsFather">
                    <Columns>
                        <asp:BoundField DataField="myField1" HeaderText="myText1" />
                        <asp:BoundField DataField="myField2" HeaderText="myText2" />
                        <asp:BoundField DataField="myField3" HeaderText="myText3" />
                        <asp:TemplateField>
                            <ItemTemplate>
                                <asp:GridView ID="gvSon" runat="server" DataSourceID="odsSon">
                                    <Columns>
                                        <asp:BoundField DataField="myField1" HeaderText="myText1" />
                                        <asp:BoundField DataField="myField2" HeaderText="myText2" />
                                        <asp:BoundField DataField="myField3" HeaderText="myText3" />
                                    </Columns>
                                </asp:GridView>
                            </ItemTemplate>
                        </asp:TemplateField>
                    </Columns>
                </asp:GridView>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

<asp:ObjectDataSource ID="odsGrandFather" runat="server" DataObjectTypeName="Company" TypeName="CompanyDAO" SelectMethod="FindAll" />
<asp:ObjectDataSource ID="odsFather" runat="server" DataObjectTypeName="Employees" TypeName="EmployeesDAO" SelectMethod="FindByID">
    <SelectParameters>
        <asp:Parameter Name="myFieldInCompanyObject" Type="String" />
    </SelectParameters>
</asp:ObjectDataSource>
<asp:ObjectDataSource ID="odsSon" runat="server" DataObjectTypeName="Person"TypeName="PersonsDAO" SelectMethod="FindByID">
    <SelectParameters>
        <asp:Parameter Name="myFieldInEmployeesObject" Type="String" />
    </SelectParameters>
</asp:ObjectDataSource>

想象你有你的公司对象

Company
  Field1
  Field2
  Field3
  Employees witch is List<Person>
    Field1
    Field2
    Field3
    Person  witch is List<Person>
      Field1
      Field2
      Field3

您需要做的就是每个DAO并返回列表或对象本身

public class CompanyDAO
{
    private List<Company> Companies
    {
        get
        {
            List<Company> companies = HttpContext.Current.Session["Companies"] as List<Company>;
            if (companies == null)
                companies = new List<Company>();
            return companies;
        }
    }
    public CompanyDAO() { }

    [DataObjectMethod(DataObjectMethodType.Select)]
    public IEnumerable<Company> FindAll()
    {
        return this.Companies;
    }

    [DataObjectMethod(DataObjectMethodType.Select)]
    public IEnumerable<Company> FindByID(String CompanyID)
    {
        return (from c in this.Companies where c.ID == CompanyID select c).ToList();
    }
}

希望它能帮助看到隧道尽头的光线;)