C# GridView 绑定了嵌套类的属性
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GridView bound with Properties of nested class
提问by Ant Swift
I have an object map similar to what's listed below. When I try to bind the properties of NestedClass in a GridView I get the error:
我有一个类似于下面列出的对象映射。当我尝试在 GridView 中绑定 NestedClass 的属性时，出现错误：
"A field or property with the name 'NestedClass.Name' was not found on the selected data source."
“在所选数据源上找不到名为“NestedClass.Name”的字段或属性。”
The GridView is bound to an ObjectDataSource and the ObjectDataSource is bound to a fully populated instance of BoundClass.
GridView 绑定到一个 ObjectDataSource，而 ObjectDataSource 绑定到一个完全填充的 BoundClass 实例。
Is there any way around this?
有没有办法解决？
Sample classes:
示例类：
public class BoundClass
{
public string Name { get; set; }
public NestedClass NestedClass { get; set; }
}
public class NestedClass
{
public string Name { get; set; }
}
采纳答案by Evan
Only immediate properties of an instance can be displayed in a BoundField column.
BoundField 列中只能显示实例的直接属性。
One must instead use DataBinder.Eval in an itemtemplate to access the nested property instead of assigning it to a boundfield.
必须在 itemtemplate 中使用 DataBinder.Eval 来访问嵌套属性，而不是将其分配给 boundfield。
Example:
例子：
<asp:TemplateField>
<itemtemplate>
<p><%#DataBinder.Eval(Container.DataItem, "NestedClass.Name")%></p>
</itemtemplate>
</asp:TemplateField>
Alternatively, you can create a custom class which inherits BoundField and overrides GetValue to use DataBinder.Eval, as described in this blog post:
或者，您可以创建一个自定义类，该类继承 BoundField 并覆盖 GetValue 以使用 DataBinder.Eval，如本博客文章中所述：
回答by Sjoerd
This extension on BoundField calls DataBinder.Eval(), which does support nested properties:
BoundField 上的此扩展调用DataBinder.Eval()，它确实支持嵌套属性：
public class BetterBoundField : BoundField
{
protected override object GetValue(Control controlContainer)
{
if (DataField.Contains("."))
{
var component = DataBinder.GetDataItem(controlContainer);
return DataBinder.Eval(component, DataField);
}
return base.GetValue(controlContainer);
}
}
