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目标：将 SQL 视图中的数据显示到 asp.net 页面上的 ListView 有一个带有新视图的新数据库，我需要将其指向

错误：

System.Reflection.TargetInvocationException: '调用的目标已抛出异常。' 内部异常 NotSupportedException：LINQ to Entities 不支持指定的类型成员“Alternate_ID”。仅支持初始化程序、实体成员和实体导航属性。

System.InvalidOperationException: '当 DataBoundControl 启用分页时，SelectMethod 应返回 IQueryable 或应具有所有这些强制参数：int startRowIndex、int maximumRows、out int totalRowCount'

尝试过： 我查看了有关列表视图、文档、项目类型、数据绑定等的教程。我发现的其中一个问题是：LINQ to Entities 不支持指定的类型成员。仅支持初始化程序、实体成员和实体导航属性 我查看了模型、视图、检查拼写、设计器文件、pocos 等。

代码：

默认.aspx：

 <asp:ListView id="lstClaims" runat="server" ItemType="Placeholder.Data.vx_EligibilitySearch" SelectMethod="lstMembers_GetData" OnItemCommand="lstMembers_ItemCommand" 
        ItemPlaceholderID="litPlaceHolder">
 <LayoutTemplate>
            <div class="table-responsive">
                <table class="table">
                    <thead>
                        <tr>
                            <th></th>
                            <th><asp:LinkButton id="Sort_Claim_Number" runat="server" CommandArgument="Group_Description" CommandName="Sort">Group</asp:LinkButton></th>
                            <th><asp:LinkButton id="Sort_Claim_Status" runat="server" CommandArgument="Group_ID" CommandName="Sort">Group ID</asp:LinkButton></th>
                            <th><asp:LinkButton id="Sort_Plan" runat="server" CommandArgument="Alternate_ID" CommandName="Sort">Member ID</asp:LinkButton></th>

</thead>
                    <asp:Literal ID="litPlaceHolder" runat="server" />
                </table>
            </div>
        </LayoutTemplate>



 <ItemTemplate>
            <tr>
                <td><%# Item.Group_Description %></td>
                <td><%# Item.Group_ID %></td>
                <td><%# Item.Alternate_ID %></td>

  </tr>
        </ItemTemplate>
    </asp:ListView>

注意：受保护的全局::System.Web.UI.WebControls.ListView lstClaims; 在 default.aspx.designer.cs 中

这指向 [ lstClaims.DataBind(); ] :

  if (memberIDIsValid || memberIsValid)
            {
                ShouldSearch = true;
                lstClaims.DataBind();
            }

这是在方法中：lnkSearch_Click，从这里的aspx页面调用（当点击搜索按钮时）：

<p><asp:LinkButton ID="lnkSearch" runat="server" OnClick="lnkSearch_Click" CssClass="btn btn-default"><i class="fa fa-search"></i> Search Members</asp:LinkButton></p>

获取数据的方法：

public IQueryable<vx_EligibilitySearch> lstMembers_GetData()
        {
            litNumSearchResults.Text = "";

            // IQueryable<Member> members = null;
            IQueryable<vx_EligibilitySearch> members = null;


            try
            {
                if (!ShouldSearch)
                    return members;

                panelSearchForm.Visible = false;
                lnkButtonBackToSearch.Visible = true;

                members = GetDataFromQuery();


public IQueryable<vx_EligibilitySearch> GetDataFromQuery()  
        {
            // IQueryable<Member> members = null;
            IQueryable<vx_EligibilitySearch> members = null;



            try
            {
                // members = somedb.Members.AsNoTracking().AsQueryable(); //.OrderBy(a => a.Claim_Number)
                members = somedb.vx_EligibilitySearch.AsNoTracking().AsQueryable(); //.OrderBy(a => a.Claim_Number)


                if (!string.IsNullOrEmpty(Search_MemberID))
                    // members = members.Where(m => m.Subscriber_ID == Search_MemberID).AsQueryable();
                    members = members.Where(m => m.Alternate_ID == Search_MemberID).AsQueryable();

在部分类 vx_EligibilitySearch 我有：

public string Alternate_ID { get; set; }

更多的：

namespace Placeholder.Data
{
    using System;
    using System.Collections.Generic;

    public partial class vx_EligibilitySearch
    {
        public string Subscriber_ID { get; set; }


        public string Group_Description { get; set; }
        public string Group_ID { get; set; }
        public string Alternate_ID { get; set; }
        public string Member_Name { get; set; }
        public string Sex { get; set; }
        public Nullable<System.DateTime> Birth_Date { get; set; }

数据库上下文：

members = somedb.vx_EligibilitySearch.AsNoTracking().AsQueryable(); //.OrderBy(a => a.Claim_Number)

转到 somedb 的定义将我带到 BasePage.cs：

protected VBADemoEntities somedb = new VBADemoEntities();

当我转到 VBADemoEntities 的定义时：

namespace Placeholder.Data

public partial class VBADemoEntities : DbContext
    {
        public VBADemoEntities()
            : base("name=VBADemoEntities")
        {
        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            throw new UnintentionalCodeFirstException();
        }

        public virtual DbSet<Auth> Auths { get; set; }
        ...........
        public virtual DbSet<Member> Members { get; set; }
        public virtual DbSet<vx_EligibilitySearch> vx_EligibilitySearch { get; set; }
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1 回答 1

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您不能在实体框架查询中进行对象比较，因为 EF 需要将您的 LINQ 语句转换为 SQL 查询才能执行任何操作（查询）。

于 2018-08-22T18:12:22.527 回答