49 lines
2.1 KiB
C#
49 lines
2.1 KiB
C#
namespace ASC.Core.Common.EF
|
|
{
|
|
public static class LinqExtensions
|
|
{
|
|
public static IOrderedQueryable<T> OrderBy<T>(this IQueryable<T> query, string name, bool sortOrderAsc)
|
|
{
|
|
var propInfo = GetPropertyInfo(typeof(T), name);
|
|
var expr = GetOrderExpression(typeof(T), propInfo);
|
|
|
|
var method = typeof(Queryable).GetMethods().FirstOrDefault(m => m.Name == (sortOrderAsc ? "OrderBy" : "OrderByDescending") && m.GetParameters().Length == 2);
|
|
var genericMethod = method.MakeGenericMethod(typeof(T), propInfo.PropertyType);
|
|
|
|
return (IOrderedQueryable<T>)genericMethod.Invoke(null, new object[] { query, expr });
|
|
}
|
|
|
|
public static IOrderedQueryable<T> ThenBy<T>(this IOrderedQueryable<T> query, string name, bool sortOrderAsc)
|
|
{
|
|
var propInfo = GetPropertyInfo(typeof(T), name);
|
|
var expr = GetOrderExpression(typeof(T), propInfo);
|
|
|
|
var method = typeof(Queryable).GetMethods().FirstOrDefault(m => m.Name == (sortOrderAsc ? "ThenBy" : "ThenByDescending") && m.GetParameters().Length == 2);
|
|
var genericMethod = method.MakeGenericMethod(typeof(T), propInfo.PropertyType);
|
|
|
|
return (IOrderedQueryable<T>)genericMethod.Invoke(null, new object[] { query, expr });
|
|
}
|
|
|
|
|
|
private static PropertyInfo GetPropertyInfo(Type objType, string name)
|
|
{
|
|
var properties = objType.GetProperties();
|
|
var matchedProperty = properties.FirstOrDefault(p => p.Name.Equals(name, StringComparison.OrdinalIgnoreCase));
|
|
if (matchedProperty == null)
|
|
{
|
|
throw new ArgumentException(nameof(name));
|
|
}
|
|
|
|
return matchedProperty;
|
|
}
|
|
private static LambdaExpression GetOrderExpression(Type objType, PropertyInfo pi)
|
|
{
|
|
var paramExpr = Expression.Parameter(objType);
|
|
var propAccess = Expression.PropertyOrField(paramExpr, pi.Name);
|
|
var expr = Expression.Lambda(propAccess, paramExpr);
|
|
|
|
return expr;
|
|
}
|
|
}
|
|
}
|