private static IEnumerable <LambdaExpression> GetExpressionList <T>(SortParameter par, IFilterSortPropResolver propResolver) where T : class, new()
{
IEnumerable <LambdaExpression> exprList = null;
if (propResolver != null)
{
exprList = propResolver.FindResolution(par.Type ?? typeof(T), typeof(T), ListControlActionType.Sorting, par.ColumnName);
}
if (exprList == null || exprList.Count() == 0)
{
exprList = new LambdaExpression[] { par.GetLinqSortExpr <T>() };
}
return(exprList);
}
private static object InvokeSortParameterOnQueryable <T>(object sourceList, SortParameter par, IFilterSortPropResolver propResolver, string ascMethodName, string descMethodName)
where T : class, new()
{
bool isFirst = true;
foreach (var expr in GetExpressionList <T>(par, propResolver))
{
if (isFirst)
{
sourceList = InvokeSortParameterOnQueryable <T>(sourceList, expr, par.SortDirection, ascMethodName, descMethodName);
isFirst = false;
}
else
{
sourceList = InvokeSortParameterOnQueryable <T>(sourceList, expr, par.SortDirection, "ThenBy", "ThenByDescending");
}
}
return(sourceList);
}
private static object InvokeSortParameterOnEnumerableNext <T>(object sourceList, SortParameter par, IFilterSortPropResolver propResolver) where T : class, new()
{
return(InvokeSortParameterOnEnumerable <T>(sourceList, par, propResolver, "ThenBy", "ThenByDescending"));
}
private static object InvokeSortParameterOnQueryableFirst <T>(object sourceList, SortParameter par, IFilterSortPropResolver propResolver) where T : class, new()
{
return(InvokeSortParameterOnQueryable <T>(sourceList, par, propResolver, "OrderBy", "OrderByDescending"));
}