实体框架Where方法 [英] entity framework Where method

问题描述

在这方面我需要一些帮助，我该如何在我希望基于两列检索记录的地方编写where子句语句:

i need some help in this , how do i write a where clause statement where i want to retrieve record based on 2 columns :

这就是我试图用代码编写的方式:

This is how i am trying to write in code :

public IList<Model.question> GetAll(string search , int search1)
{
    IList<Model.question> lstQuestions = context.questions.ToList();
    return lstQuestions.Where(a => a.TaskName.Contains(search) && p => p.ActivityID.Contains(search1)).ToList(); 
}

但是此语句有错误.

-----高于解决方案------------

----- ABOVE SOLVED ------------

还有另一个问题:

 public int GetMaxValue(string listTask , int listActivity)
    {

        int maxQNo = Convert.ToInt32(context.questions.Max(q => q.QuestionNo).Where(q.TaskName.Contains(listTask) && q.ActivityID == listActivity));

        return maxQNo+1;
    }

我得到错误，其中q不存在是当前上下文，我在这里试图做的是获取列的最大值(questionNo)，其中taskname =列表任务，而activityid =列表活动.

i get the error where q doesn't exist is current context , what i am trying to do here , is to get the max value of the column ( questionNo) where taskname = list task and activityid = list activity.

推荐答案

public IList<Model.question> GetAll(string search , int search1)
    {
        IList<Model.question> lstQuestions = context.questions.ToList();
        return lstQuestions.Where(a => a.TaskName.Contains(search) && a.ActivityID==search1)).ToList(); 
    }

新问题的答案:

在Where子句中添加q =>块.

public int GetMaxValue(string listTask , int listActivity)
{

    int maxQNo = Convert.ToInt32(context.questions.Max(q => q.QuestionNo)
                                                  .Where(q=>q.TaskName.Contains(listTask) && 
                                                         q.ActivityID.Contains(listActivity));

    return maxQNo+1;
}

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