Linq查询不操作符

本文关键字：操作符 查询 Linq | 更新日期: 2023-09-27 18:17:34

我是linq的新手，我想知道如何在linq查询中编写不等于(!=)，如SQL中所示:

select 
    projects.Name 
from 
    Projects 
inner join 
    projectPermissions on (projects.FK_Owner_ID != projectpermissions.FK_User_ID and Projects.Project_ID = projectPermissions.FK_Project_ID) 
where 
    ProjectPermissions.FK_User_ID = 53;
var projects = (from project in this.context.Projects
                join shareProjects in this.context.ProjectPermissions on
                       new { UserID = project.FK_Owner_ID, ProjectID = project.Project_ID } equals
                       new { UserID = shareProjects.FK_User_ID, ProjectID = shareProjects.FK_Project_ID }
                where shareProjects.FK_User_ID == userId
                select new
                       {};

Linq查询不操作符

您可以始终使用where代替，join只支持相等键比较:

var projects =from project in this.context.Projects
              join shareProjects in this.context.ProjectPermissions on
                   project.Project_ID equals shareProjects.FK_Project_ID
              where  project.FK_Owner_ID != shareProjects.FK_User_ID &&
                     shareProjects.FK_User_ID == userId
              select new{};

你必须否定它:

on (!(projects.FK_Owner_ID == projectpermissions.FK_User_ID) and Projects.Project_ID = projectPermissions.FK_Project_ID)
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