C# 实体框架下主数据表及相关表的处理

我有三张桌子

员工（ID、名字、姓氏）-其中包括所有员工，包括经理等

EmployeeRole（RoleID，Role）-这里我们定义了员工的角色

项目（项目名称、经理、员工、日期）-这里是分配给所有员工的项目的详细信息

在项目表中，我有Emmployee、Manager等列，这两列都是Employee表的外键。问题是我有输入，比如（Firstname，Lastname），如何找到雇员的id。 或者是表结构错误

当我尝试在项目表中插入数据时，EmployeeRole表也在更新。它不应该更新EmployeeRole表。这是一个主数据

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请向我推荐解决方案？

您的逻辑数据模型不正确（IMHO）

一个项目可以有很多员工。一名员工可以作为一个特定角色参与一个或多个项目

所以员工和项目之间是多对多的关系，交集表有一个角色类型

e、 g

那么你的生命就像这样：

// Add a new Role
Role role = new Role();
role.RoleID = 1;   // TODO: make identity in database
role.RoleName = "Role 1";
db.Roles.Add(role);
db.SaveChanges();

// Add a new Employee
Employee employee = new Employee();
employee.EmployeeID = 1;   // TODO: make identity in database
employee.FirstName = "Carl";
employee.LastName = "Prothman";
db.Employee.Add(employee);
db.SaveChanges();

// Add a new Project
Project project = new Project();
project.ProjectID = 1;   // TODO: make identity in database
project.ProjectName = "Create new data model";
db.SaveChanges();

// Add employee to project as role1
ProjectEmployee projectEmployee = new ProjectEmployee();
projectEmployee.ProjectID = project.ProjectID;
projectEmployee.EmployeeID = employee.EmployeeID;
projectEmployee.RoleID = role.RoleID;
db.ProjectEmployees.Add(projectEmployee);
db.SaveChanges();

// Add a new Role
Role role = new Role();
role.RoleID = 1;   // TODO: make identity in database
role.RoleName = "Role 1";
db.Roles.Add(role);
db.SaveChanges();

// Add a new Employee
Employee employee = new Employee();
employee.EmployeeID = 1;   // TODO: make identity in database
employee.FirstName = "Carl";
employee.LastName = "Prothman";
db.Employee.Add(employee);
db.SaveChanges();

// Add a new Project
Project project = new Project();
project.ProjectID = 1;   // TODO: make identity in database
project.ProjectName = "Create new data model";
db.SaveChanges();

// Add employee to project as role1
ProjectEmployee projectEmployee = new ProjectEmployee();
projectEmployee.ProjectID = project.ProjectID;
projectEmployee.EmployeeID = employee.EmployeeID;
projectEmployee.RoleID = role.RoleID;
db.ProjectEmployees.Add(projectEmployee);
db.SaveChanges();