/**
* Вспомогательный метод получения списка должностей
*/
private ApiResult GetList(JobTitle filters)
{
ApiResult result = new ApiResult();
try
{
IQueryable <JobTitle> list = DataBase.JobTitles;
// Фильтрация по параметрам из строки запроса
Type jtType = new JobTitle().GetType();
Type[] exprArgTypes = { list.ElementType };
foreach (PropertyInfo index in jtType.GetProperties())
{
// свойство не виртуальное и пришло значение в форме
if (!jtType.GetProperty(index.Name).GetGetMethod().IsVirtual&& Request.Params.Get(index.Name) != null)
{
ParameterExpression p = Expression.Parameter(typeof(JobTitle), "p");
MemberExpression member = Expression.PropertyOrField(p, index.Name);
LambdaExpression lambda = Expression.Lambda <Func <JobTitle, bool> >(Expression.Equal(member, Expression.Constant(filters.GetType().GetProperty(index.Name).GetValue(filters))), p);
MethodCallExpression methodCall = Expression.Call(typeof(Queryable), "Where", exprArgTypes, list.Expression, lambda);
list = (IQueryable <JobTitle>)list.Provider.CreateQuery(methodCall);
}
}
result.DataSet = list.Select(jobtitle => new
{
Id = jobtitle.Id,
Title = jobtitle.Title,
Deleted = jobtitle.Deleted,
UsersCount = jobtitle.Users.Count()
});
result.Success = true;
}
catch (Exception e)
{
result.Success = false;
result.Message = e.ToString();
}
return(result);
}