如何将gridview列绑定到子类值？

I have a ASP.net gridview that I am trying bind to. My DataSource has a collection and 2 of the columns I am binding to are part of a subclass. My DataSource has a subclass called Staff the contains the staff information. The boundfields SurveyID and NumberOfExceptions bind fine, but the Staff.Name and Staff.Office cannot be bound.

我有一个ASP.net gridview,我正在尝试绑定。我的DataSource有一个集合,我绑定的2列是子类的一部分。我的DataSource有一个名为Staff的子类,其中包含人员信息。 Boundfields SurveyID和NumberOfExceptions绑定正常,但Staff.Name和Staff.Office无法绑定。

asp:BoundField DataField="SurveyID" HeaderText="ID" ...
asp:BoundField DataField="Staff.Name" HeaderText="Name" ...
asp:BoundField DataField="Staff.Office" HeaderText="Office" ...
asp:BoundField DataField="NumberOfExceptions" HeaderText="Exceptions" ...

And the code behind is:

而背后的代码是:

uxSurveyGrid.DataSource = searchResults;
uxSurveyGrid.DataBind();

If I type searchResults[0].Staff.Name in the code behind I can see the value, why is the runtime not being able to evaluate Staff.Name in the gridview?

如果我在后面的代码中键入searchResults [0] .Staff.Name,我可以看到值,为什么运行时无法在gridview中评估Staff.Name?

How do you bind the columns to the subclass values? Do I have to do it in codebehind?

如何将列绑定到子类值?我是否必须在代码隐藏中执行此操作?

Any help would be appreciated,

任何帮助,将不胜感激,

Mark.

4 个解决方案

#1

I believe you can get this to work using a Template field and a markup scriptlet...

我相信你可以使用Template字段和标记scriptlet来实现这一点......

    <asp:TemplateField>
        <ItemTemplate>
            <asp:Label Id="lblSubclassVal" runat="server" Text="<%# DataBinder.Eval(Container.DataItem, "SubClass.PropertyName")%>"></asp:Label>
        </ItemTemplate>
    </asp:TemplateField>

#2

The data binding mechanism behind ASP.NET GridView supports only one level bindings. (as opposed to its WinForms Binding counterpart that supports multi-level in the case of binding to a DataSet / DataTable / DataView).

ASP.NET GridView背后的数据绑定机制仅支持一个级别绑定。 (而不是在绑定到DataSet / DataTable / DataView的情况下支持多级的WinForms Binding对应物)。

You have three possible solutions:

您有三种可能的解决方案:

Handling the ItemDataBound event for each row

处理每行的ItemDataBound事件

Extending your root level entities with properties that expose the child object properties and using these properties for the binding expressions

使用公开子对象属性的属性扩展根级实体,并使用这些属性作为绑定表达式

Instead of using a BoundField you could use a Template Field and generate the content using a <%= %> expression that accesses the Data Item.

您可以使用模板字段而不是使用BoundField,并使用访问数据项的<%=%>表达式生成内容。

#3

Mark,

I am 99.9% sure that you will have to handle this in the codebehind on the ItemDataBound event for the individual row.

我99.9%肯定你必须在单个行的ItemDataBound事件的代码隐藏中处理这个问题。

Remember you can get the whole databould object from e.Item.DataItem

请记住,您可以从e.Item.DataItem获取整个数据库对象

#4

The [Name].[Name] syntax is not supported by BoundField. Only simple property names.

BoundField不支持[Name]。[Name]语法。只有简单的属性名称。

#1