Linq使用值到where子句动态连接两个表

Question

These are my tables

I want an output where the U_CCode of first table, which is also a foreign key to my second table can be used to join both to show something like this (note : here I have passed A1 as parameter to where clause but I want it to dynamically select whatever value of U_CCode I assign to the controller by a string variable. I want to achieve this using LINQ and I am not able to understand how to use it in MVC controller.

I want to assign the output of this query to a selectlist which I want to use in my view via viewbag .

I am new to this, can someone help me with the script for this query?

CODE

public ActionResult Create(string U_CCode)
{
    var departments = db.Class.Where(q => q.U_CCode == U_CCode); 
    ViewBag.SelectedDepartment = new SelectList(departments, "U_CLCode", "U_CLName");
}

Answer 1

Try like this: (EDITED)

var departmentsQuery = (from e in db.Class where e.U_CCode==U_CCode select e).ToList();
ViewBag.SelectedDepartment = departmentsQuery;

Pass it to the view..

In view:

@Html.DropDownList(
    "name", 
    new SelectList(
        ((List<yourTypename>)ViewBag.SelectedDepartment).Select(x => new { Value = x.U_CCode, Text = x.U_CLName }),
        "Value",
        "Text"
    )
)