在linq中添加where子句

Question

I am new to Linq. Please help.On this query i need to add where clause (like EMPLOYEE_ID==10 ).db stands dbcontext.

    var query = db.EmpQualifications.Select(EmpQu => new {
EMP_QUALI_ID = EmpQu.EMP_QUALI_ID,EMPLOYEE_ID = EmpQu.EMPLOYEE_ID,
 }).OrderBy(D => D.EMP_QUALI_ID);

Answer 1

Simply Add the where clause before Select

var results = db.EmpQualifications
                   .Where(r=> r.EMPLOYEE_ID == 10)
                   .Select(EmpQu => 
                             new {
                                 EMP_QUALI_ID = EmpQu.EMP_QUALI_ID,
                                 EMPLOYEE_ID = EmpQu.EMPLOYEE_ID, 
                                 })
                   .OrderBy(D => D.EMP_QUALI_ID);

Answer 2

You can use it like;

var query = db.EmpQualification
               .Where(e => e.MPLOYEE_ID==10)
               .Select...

You can read more information fromm where clause - Query Keywords

The where clause is a filtering mechanism. It can be positioned almost anywhere in a query expression, except it cannot be the first or last clause . A where clause may appear either before or after a group clause depending on whether you have to filter the source elements before or after they are grouped.

Answer 3

在Select之前添加Where扩展方法

var query = db.EmpQualifications.Where(x => x.MPLOYEE_ID==10).Select....