运营商'&&'不能应用于类型为“int？”的操作数。和“int” [英] operator '&&' cannot be applied to operands of type "int?" and "int"

问题描述

  var  data =（ from  m  in  ContextDb.Modules 
  join  itm  in  ContextDb。 m.ModuleId上的RoleAssignments等于itm.ModuleId&& itm.RoleId =  2  
 选择  new  RoleAssignmentModel {RoleAssignmentId = itm.RoleAssignmentId，RoleId = itm.RoleId}）。ToList（）; 

i有3个名为tbl_Role，Modules和RoleAssignment的表。当我使用上面的查询时，得到一个错误，因为-operator'&&'不能应用于类型为int？的操作数。和int

in（itm.ModuleId&& itm.RoleId = 2 ...）。

解决方案

试试：

  var  data =（ from  m   ContextDb.Modules 
  join  itm  in  ContextDb.RoleAssignments on（m.ModuleId == itm.ModuleId）&&（itm.RoleId ==  2 ）
 选择  new  RoleAssignmentModel {RoleAssignmentId = itm.RoleAssignmentId，RoleId = itm.RoleId}）。ToList（）; 

var data = (from m in ContextDb.Modules
           join itm in ContextDb.RoleAssignments on m.ModuleId equals itm.ModuleId && itm.RoleId = 2
           select new RoleAssignmentModel { RoleAssignmentId = itm.RoleAssignmentId, RoleId = itm.RoleId}).ToList();

i am having 3 tables of name tbl_Role, Modules and RoleAssignment. when i use the above query , got an error as -operator '&&' cannot be applied to operands of type "int?" and "int"
in ( itm.ModuleId && itm.RoleId = 2...).

解决方案

Try:

var data = (from m in ContextDb.Modules
           join itm in ContextDb.RoleAssignments on (m.ModuleId == itm.ModuleId) && (itm.RoleId == 2)
           select new RoleAssignmentModel { RoleAssignmentId = itm.RoleAssignmentId, RoleId = itm.RoleId}).ToList();

这篇关于运营商'&&'不能应用于类型为“int？”的操作数。和“int”的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！