Asp.net mvc 从搜索结果中缩小搜索范围

我所处的情况是，我必须动态创建一个查询来记录我的搜索结果。我需要根据用户从“主题/标准”复选框中的选择动态地在查询中添加“和”条件

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试着这样做：

DECLARE @SQL NVARCHAR(500)
DECLARE @SubjectCommand VARCHAR(50)

SET @SubjectCommand = ''

IF (SubjectIsSelected)
BEGIN
    SET  @SubjectCommand = 'AND (Subject_1 = ''Maths'' OR Subject_2 = ''Maths'' OR Subject_3 = ''Maths'')'
END

SET @SQL = 'SELECT First_Name, Last_Name, City, Subject_1, Subject_2, Subject_3, 
   Standard_From, Standard_To FROM TutorProfile WHERE City = ''Mumbai''' +@SubjectCommand 

EXEC(@SQL)

DECLARE @SQL NVARCHAR(500)
DECLARE @SubjectCommand VARCHAR(50)

SET @SubjectCommand = ''

IF (SubjectIsSelected)
BEGIN
    SET  @SubjectCommand = 'AND (Subject_1 = ''Maths'' OR Subject_2 = ''Maths'' OR Subject_3 = ''Maths'')'
END

SET @SQL = 'SELECT First_Name, Last_Name, City, Subject_1, Subject_2, Subject_3, 
   Standard_From, Standard_To FROM TutorProfile WHERE City = ''Mumbai''' +@SubjectCommand 

EXEC(@SQL)