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prep the field for building the select statement next.

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This commit is contained in:
David Lebée 2018-03-12 22:26:41 -05:00
parent 436bd5ab98
commit 30d1d9072b
4 changed files with 135 additions and 13 deletions
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27
PoweredSoft.DynamicLinq.Test/GroupingTests.cs
View File

@ -48,6 +48,7 @@ namespace PoweredSoft.DynamicLinq.Test
B = t.NetSales
});*/
/*
var dynamicSyntax2 = TestData.Sales
.AsQueryable()
.GroupBy(t => t.Path("ClientId").Path("NetSales", "B"));
@ -69,7 +70,7 @@ namespace PoweredSoft.DynamicLinq.Test
Data = t.ToList()
}).ToList();
int i = 0;
int i = 0;*/
/*
@ -84,18 +85,18 @@ namespace PoweredSoft.DynamicLinq.Test
Sales = t.ToList()
});*/
.Select(t =>
{
t.PropertyFromKey("TheClientId", "ClientId");
t.Count("Count");
// don't have to implement right away.
t.Count("CountClientId", "ClientId", ConditionOperators.GreaterThan, 1);
t.LongCount("LongCount");
t.Sum("NetSales");
t.Average("TaxAverage", "Tax");
t.ToList("Sales");
});
var dynamicSyntax2 = TestData.Sales
.AsQueryable()
.GroupBy(t => t.Path("ClientId"))
.Select(t =>
{
t.Key("TheClientId", "ClientId");
t.Count("Count");
t.LongCount("LongCount");
t.Sum("NetSales");
t.Average("Tax", "TaxAverage");
t.ToList("Sales");
});
}
private object compare(MockSale arg)

10
PoweredSoft.DynamicLinq/Constants.cs
View File

@ -41,6 +41,16 @@ namespace PoweredSoft.DynamicLinq
Descending
}
public enum SelectTypes
{
Key,
Count,
LongCount,
Sum,
Average,
ToList
}
internal static class Constants
{
internal static readonly MethodInfo GroupByMethod = typeof(Queryable).GetMethods().First(t => t.Name == "GroupBy");

10
PoweredSoft.DynamicLinq/Extensions/QueryableExtensions.cs
View File

@ -88,5 +88,15 @@ namespace PoweredSoft.DynamicLinq
return QueryableHelpers.GroupBy(query, type, groupBuilder.Parts, groupBuilder.Type, groupBuilder.EqualityComparerType);
}
public static IQueryable Select(this IQueryable query, Action<SelectBuilder> callback)
{
var sb = new SelectBuilder();
callback(sb);
if (sb.Empty)
throw new Exception("No select specified, please specify at least one select path");
return query;
}
}
}

101
PoweredSoft.DynamicLinq/Fluent/Select/SelectBuilder.cs
View File

@ -1,11 +1,112 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace PoweredSoft.DynamicLinq.Fluent
{
public class SelectPart
{
public string Path { get; set; }
public string PropertyName { get; set; }
public SelectTypes SelectType { get; set; }
}
public class SelectBuilder
{
public List<SelectPart> Parts = new List<SelectPart>();
public bool Empty => Parts?.Count == 0;
protected void throwIfUsedOrEmpty(string propertyName)
{
if (string.IsNullOrEmpty(propertyName))
throw new ArgumentNullException($"{propertyName} cannot end up be empty.");
if (Parts.Any(t => t.PropertyName == propertyName))
throw new Exception($"{propertyName} is already used");
}
public SelectBuilder Key(string propertyName, string path = null)
{
if (propertyName == null)
propertyName = path.Split('.').LastOrDefault();
throwIfUsedOrEmpty(propertyName);
Parts.Add(new SelectPart
{
Path = path == null ? "Key" : $"Key.{path}",
PropertyName = propertyName,
SelectType = SelectTypes.Key
});
return this;
}
public SelectBuilder Count(string propertyName)
{
throwIfUsedOrEmpty(propertyName);
Parts.Add(new SelectPart
{
PropertyName = propertyName,
SelectType = SelectTypes.Count
});
return this;
}
public SelectBuilder LongCount(string propertyName)
{
throwIfUsedOrEmpty(propertyName);
Parts.Add(new SelectPart
{
PropertyName = propertyName,
SelectType = SelectTypes.LongCount
});
return this;
}
public SelectBuilder Sum(string path, string propertyName = null)
{
if (propertyName == null)
propertyName = path.Split('.').LastOrDefault();
throwIfUsedOrEmpty(propertyName);
Parts.Add(new SelectPart
{
Path = path,
PropertyName = propertyName,
SelectType = SelectTypes.Sum
});
return this;
}
public SelectBuilder Average(string path, string propertyName = null)
{
if (propertyName == null)
propertyName = path.Split('.').LastOrDefault();
throwIfUsedOrEmpty(propertyName);
Parts.Add(new SelectPart
{
Path = path,
PropertyName = propertyName,
SelectType = SelectTypes.Average
});
return this;
}
public SelectBuilder ToList(string propertyName)
{
throwIfUsedOrEmpty(propertyName);
Parts.Add(new SelectPart
{
PropertyName = propertyName,
SelectType = SelectTypes.ToList
});
return this;
}
}
}