Express对条件的手动拼接

 

 

 

 

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///查询数据库的仓储类          ItestRepository test = new TestRepository();          ParameterExpression parameterExpression = Expression.Parameter(typeof(Test), "d");            PropertyInfo IdProp = typeof(Test).GetProperty("Id");          MemberExpression IdPropExp = Expression.Property(parameterExpression, IdProp);            MethodInfo equals = typeof(int).GetMethod("Equals", new Type[1]{                typeof(int)              });          ConstantExpression constant = Expression.Constant(1);            var tt = Expression.Call(IdPropExp, equals, constant);            Expression<Func<Test, bool>> pre = Expression.Lambda<Func<Test, bool>>(              tt, new ParameterExpression[1]              {                  parameterExpression              }              );          var where = pre.Compile();          var end = test.FindAll(where);