Question

我试图理解LINQ查询的语法。我尝试创建一个来从我的TRACK_INFO表中选择所有行，其中columnOf列等于变量。我的数据库名称是KuPlan。下面是我试图创建的查询和我的TRACK_INFO模型。我得到的错误是：＆＃34;找不到源类型KU_PLAN_DEV.Models.TRACK_INFO的查询模式的实现。＆＃39;凡＆＃39;没找到。＆＃34;

控制器：

var query = from degreeName in TRACK_INFO
            where degreeName == trackButton
            select degreeName;

模型：

namespace KU_PLAN_DEV.Models
{
using System;
using System.Collections.Generic;

public partial class TRACK_INFO
{
    public TRACK_INFO()
    {
        this.CORE_HEAD = new HashSet<CORE_HEAD>();
        this.GEN_ED_HEAD = new HashSet<GEN_ED_HEAD>();
        this.GEN_ED_NOTE = new HashSet<GEN_ED_NOTE>();
        this.GRAD_CLEAR_HEAD = new HashSet<GRAD_CLEAR_HEAD>();
        this.MAJOR_NOTE = new HashSet<MAJOR_NOTE>();
    }

    public string progNum { get; set; }
    public string versionNum { get; set; }
    public string degreeName { get; set; }
    public string collegeOf { get; set; }
    public string effectiveDateTerm { get; set; }
    public Nullable<decimal> effectiveDateYear { get; set; }
    public string trackDegreeType { get; set; }

    public virtual ICollection<CORE_HEAD> CORE_HEAD { get; set; }
    public virtual ICollection<GEN_ED_HEAD> GEN_ED_HEAD { get; set; }
    public virtual ICollection<GEN_ED_NOTE> GEN_ED_NOTE { get; set; }
    public virtual ICollection<GRAD_CLEAR_HEAD> GRAD_CLEAR_HEAD { get; set; }
    public virtual GRAD_CLEAR_SIG_DATE GRAD_CLEAR_SIG_DATE { get; set; }
    public virtual ICollection<MAJOR_NOTE> MAJOR_NOTE { get; set; }
}
}

Answer 1

TRACK_INFO是一个类名，而不是IEnumerable<TRACK_INFO>。我想你的意思是从你的背景中获取一个属性：

        from degreeName in context.TRACK_INFO
        ...

LINQ查询语法（获取错误）

1 个答案: