实体框架中绑定自定义属性 [英] Binding custom property in Entity Framework

问题描述

我的EF模型中有一个员工实体。然后我添加一个类到项目中以添加自定义属性

  public partial class Employee 
 {
 public string Name 
 {
 get {return string.Format（{0} {1}，this.FirstName，this.LastName）; } 
} 
} 
  

在一个aspx窗体（FormView内）我想绑定一个DropDownList到员工集合：

 < asp：Label runat =serverAssociatedControlID =ddlManagerId 
 Text =ManagerId/> 
< asp：DropDownList ID =ddlManagerIdrunat =server
 DataSourceID =edsManagerId
 DataValueField =Id
 DataTextField =Name
 AppendDataBoundItems =true
 SelectedValue ='<％＃Bind（ManagerId）％>'> 
< asp：ListItem Text = - 选择 - Value =0/> 
< / asp：DropDownList> 
< asp：EntityDataSource ID =edsManagerIdrunat =server
 ConnectionString =name = Entities
 DefaultContainerName =Entities
 EntitySetName =Employees
 EntityTypeFilter =Employee
 EnableFlattening =true> 
< / asp：EntityDataSource> 
  

不幸的是，当我启动该页面时，我收到一个错误：

  DataBinding：'System.Web.UI.WebControls.EntityDataSourceWrapper'不包含名称为Name的属性。 
  

任何想法我做错了什么？

解决方案

经过多次搜索，我发现EntityDataSource不支持部分类中的自定义属性。它只返回模型中的实体。

I have an employee entity in my EF model. I then added a class to the project to add a custom property

public partial class Employee
{
    public string Name
    {
        get { return string.Format("{0} {1}", this.FirstName, this.LastName); }
    }
}

On a aspx form (inside a FormView), I want to bind a DropDownList to the employee collection:

                <asp:Label runat="server" AssociatedControlID="ddlManagerId"
                    Text="ManagerId" />
                <asp:DropDownList ID="ddlManagerId" runat="server" 
                    DataSourceID="edsManagerId" 
                    DataValueField="Id" 
                    DataTextField="Name" 
                    AppendDataBoundItems="true"
                    SelectedValue='<%# Bind("ManagerId") %>'>
                    <asp:ListItem Text="-- Select --" Value="0" />
                </asp:DropDownList>
                <asp:EntityDataSource ID="edsManagerId" runat="server" 
                    ConnectionString="name=Entities" 
                    DefaultContainerName="Entities" 
                    EntitySetName="Employees" 
                    EntityTypeFilter="Employee"
                    EnableFlattening="true">
                </asp:EntityDataSource>

Unfortunately, when I fire up the page, I get an error:

DataBinding: 'System.Web.UI.WebControls.EntityDataSourceWrapper' does not contain a property with the name 'Name'.

Any ideas what I'm doing wrong?

解决方案

After much searching I discovered that that the EntityDataSource does not support custom properties in the partial classes. It only returns the entity that is in the model.

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