/// <summary>
/// 获取(构造)查询表达式，默认忽略null值
/// </summary>
/// <typeparam name="TEntity">ExpQueryModel类型</typeparam>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="queryModel">ExpQueryModel实例</param>
/// <returns></returns>
public static Expression <Func <T, bool> > GetExpressionByQueryModel <T>(object queryModel)
//where T : Models.BaseEntity
{
var properties = queryModel.GetType().GetProperties();
var entity_properties = typeof(T).GetProperties();
List <QueryModel> conditions = new List <QueryModel>();
foreach (var p in properties)
{
if (entity_properties.Count(w => w.Name.ToLower() == p.Name.ToLower()) == 0)
{
continue; //
}
//获取特性类的属性信息
var obj = p.GetCustomAttribute(typeof(QueryAttribute), true);
var _Op_Condition = obj.GetType().GetProperty("Op_Condition").GetValue(obj);
var _Link_Condition = obj.GetType().GetProperty("Link_Condition").GetValue(obj);
var _IgnoreNullable = obj.GetType().GetProperty("IgnoreNullable").GetValue(obj);
//
conditions.Add(new QueryModel()
{
PropertyName = p.Name, Value = p.GetValue(queryModel), Op = (Op_Condition)_Op_Condition, Link = (Link_Condition)_Link_Condition, IgnoreNullable = (bool)_IgnoreNullable
});
}
var exp = LambdaHelper.GetExpression <T>(conditions);
return(exp);
}
/// <summary>
/// 获取(构造)查询表达式，默认忽略null值（用于分页查询）
/// </summary>
/// <typeparam name="TEntity">QueryPager类型</typeparam>
/// <typeparam name="BaseEntity">BaseEntity类型</typeparam>
/// <param name="queryPager">QueryPager实例</param>
/// <returns></returns>
public static Expression <Func <BaseEntity, bool> > GetExpressionByQueryPager <TEntity, BaseEntity>(TEntity queryPager)
where TEntity : Book.Models.ModelBinder.QueryModels.QueryPager
where BaseEntity : Cat.M.Book.Models.BaseEntity
{
var properties = queryPager.GetType().GetProperties();
List <QueryModel> conditions = new List <QueryModel>();
foreach (var p in properties)
{
if (p.DeclaringType.Namespace == "Cat.Models.ModelBinder.QueryModels")
{
//排除基类属性
continue;
}
//获取特性类的属性信息
var obj = p.GetCustomAttribute(typeof(Cat.Utility.Helper.Lambda.QueryAttribute), true);
if (obj == null)
{
continue;
}
var _Op_Condition = obj.GetType().GetProperty("Op_Condition").GetValue(obj);
var _Link_Condition = obj.GetType().GetProperty("Link_Condition").GetValue(obj);
var _IgnoreNullable = obj.GetType().GetProperty("IgnoreNullable").GetValue(obj);
//
conditions.Add(new QueryModel()
{
PropertyName = p.Name, Value = p.GetValue(queryPager), Op = (Op_Condition)_Op_Condition, Link = (Link_Condition)_Link_Condition, IgnoreNullable = (bool)_IgnoreNullable
});
}
var exp = LambdaHelper.GetExpression <BaseEntity>(conditions);
return(exp);
}
