c# - 在所选数据源上找不到名称为 'Username' 的字段或属性

Question

我正在使用 SqlDataSource 为 userprofile 绑定(bind) DetailsView，这允许用户查看他们的信息并同时更改他们的详细信息。 (选择、检索和更新)

但是，出现此错误 -- 当我单击超链接以定向到“用户配置文件”页面时，在所选数据源上找不到名为“用户名”的字段或属性。

Exception Details: System.Web.HttpException: A field or property with the name 'Username' was not found on the selected data source.

Source Error: 

An unhandled exception was generated during the execution of the current web request.   Information regarding the origin and location of the exception can be identified using the   exception stack trace below.

这是 userprofile.aspx 文件中的代码:

  <asp:DetailsView ID="UserProfile" runat="server" 
        AutoGenerateRows="False" DataKeyNames="UserId" 
        DataSourceID="UserProfileDataSource" DefaultMode="Edit" 
        onitemupdated="UserProfile_ItemUpdated">
        <Fields>
           <asp:BoundField DataField="Username" HeaderText="Username" 
                SortExpression="Username" />
            <asp:BoundField DataField="HomeTown" HeaderText="HomeTown" 
                SortExpression="HomeTown" />
            <asp:BoundField DataField="HomepageUrl" HeaderText="HomepageUrl" 
                SortExpression="HomepageUrl" />
            <asp:BoundField DataField="Signature" HeaderText="Signature" 
                SortExpression="Signature" />
            <asp:CommandField ShowEditButton="True" />
        </Fields>
    </asp:DetailsView>

    <asp:SqlDataSource ID="UserProfileDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:SecurityTutorialsConnectionString %>" 

        SelectCommand="SELECT * FROM [UserProfiles] WHERE ([UserId] = @UserId)" 
        onselecting="UserProfileDataSource_Selecting" 
        UpdateCommand="UPDATE UserProfiles SET
        Username = @Username,
        HomeTown = @HomeTown,
        HomepageUrl = @HomepageUrl,
        Signature = @Signature   WHERE UserId = @UserId ">

        <SelectParameters>
        <asp:Parameter Name="UserId" Type="Object" />
        </SelectParameters>
        <UpdateParameters>
            <asp:Parameter Name="HomeTown" />
            <asp:Parameter Name="HomepageUrl" />
            <asp:Parameter Name="Signature" />
            <asp:Parameter Name="UserId" />
        </UpdateParameters>
    </asp:SqlDataSource>

这是 userprofile.aspx.cs 背后的代码:

 protected void UserProfileDataSource_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
    {
        // Get a reference to the currently logged on user
        MembershipUser currentUser = Membership.GetUser();

        // Determine the currently logged on user's UserId value
        Guid currentUserId = (Guid)currentUser.ProviderUserKey;

        // Assign the currently logged on user's UserId to the @UserId parameter
        e.Command.Parameters["@UserId"].Value = currentUserId;
    }

编辑我已将 SQL 查询更改为:

 SelectCommand= "SELECT [aspnet_Membership].UserId, [HomeTown], [HomepageUrl], [Signature] FROM [UserProfiles] INNER JOIN [aspnet_Membership] ON aspnet_Membership.UserId = UserProfiles.UserId WHERE aspnet_Membership.UserId=@UserId"
    onselecting="UserProfileDataSource_Selecting"
    UpdateCommand="UPDATE UserProfiles SET
    Username = @Username,
    HomeTown = @HomeTown,
    HomepageUrl = @HomepageUrl,
    Signature = @Signature   WHERE UserId = @UserId ">

但是错误依旧出现: 在所选数据源上找不到名为“用户名”的字段或属性

Answer 1

检查 UserProfiles 表中的字段名称。您似乎没有用户名字段。最好明确说明要选择的字段，而不是使用 SELECT * FROM .. 语法。

 <asp:BoundField DataField="Username" HeaderText="Username"  
                SortExpression="Username" />