C# Eval Expression LINQ Dynamic - Any

LINQ Dynamic Any Examples

C# Dynamic LINQ Any examples using an Expression Evaluator.

Any - Simple

This C# example uses the LINQ Any method with a dynamic expression to determine if any of the words in the array contain the substring 'ei'.

LINQ

string[] words = {"believe", "relief", "receipt", "field"};

var iAfterE = words.Any(w => w.Contains("ei"));

Console.WriteLine("There is a word that contains in the list that contains 'ei': {0}", iAfterE);

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LINQ Dynamic

string[] words = {"believe", "relief", "receipt", "field"};

var iAfterE = words.Any(w => "w.Contains('ei')");

Console.WriteLine("There is a word that contains in the list that contains 'ei': {0}", iAfterE);

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LINQ Execute

string[] words = {"believe", "relief", "receipt", "field"};

var iAfterE = words.Execute<bool>("Any(w => w.Contains('ei'))");		

Console.WriteLine("There is a word that contains in the list that contains 'ei': {0}", iAfterE);

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Result

There is a word that contains in the list that contains 'ei': True

Any - Grouped

This C# example uses the LINQ Any method with a dynamic expression to return a grouped list of products only for categories that have at least one product that is out of stock.

LINQ

var products = getList();

var productGroups = products.GroupBy(p => p.Category)
	.Where(g => g.Any(p => p.UnitsInStock == 0))
	.Select(g => new {Category = g.Key, Products = g});

Console.WriteLine("Count before Any : " + products.Count());

int newCount = 0;

foreach (var group in productGroups) 
{
	newCount+= group.Products.Count();
}

Console.WriteLine("Count After Any : " + newCount);

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LINQ Dynamic

private void uiAny_Grouped_LINQ_Dynamic_Click(object sender, EventArgs e)
{
	var products = My.GetProductList();

	var productGroups = products.GroupBy(p => p.Category)
		.Where(g => g.Any(p => "p.UnitsInStock == 0"))
		.Select(g => new {Category = g.Key, Products = g});

	var sb = new StringBuilder();

	My.ObjectDumper.Write(sb, productGroups, 1);

	My.Result.Show(My.LinqResultType.LinqDynamic, uiResult, sb);
}

LINQ Execute

private void uiAny_Grouped_LINQ_Execute_Click(object sender, EventArgs e)
{
	var products = My.GetProductList();

	var productGroups = products.GroupBy(p => p.Category)
		.Where(g => g.Execute<bool>("Any(p => p.UnitsInStock == 0)"))
		.Select(g => new { Category = g.Key, Products = g });

	var sb = new StringBuilder();

	My.ObjectDumper.Write(sb, productGroups, 1);

	My.Result.Show(My.LinqResultType.LinqExecute, uiResult, sb);
}

Result

Category=Condiments    Products=... 
  Products: ProductID=3  ProductName=Aniseed Syrup      Category=Condiments    UnitPrice=10.0000      UnitsInStock=13 
  Products: ProductID=4  ProductName=Chef Anton's Cajun Seasoning        Category=Condiments    UnitPrice=22.0000      UnitsInStock=53 
  Products: ProductID=5  ProductName=Chef Anton's Gumbo Mix      Category=Condiments    UnitPrice=21.3500      UnitsInStock=0 
  Products: ProductID=6  ProductName=Grandma's Boysenberry Spread        Category=Condiments    UnitPrice=25.0000      UnitsInStock=120 
  Products: ProductID=8  ProductName=Northwoods Cranberry Sauce  Category=Condiments    UnitPrice=40.0000      UnitsInStock=6 
  Products: ProductID=15  ProductName=Genen Shouyu        Category=Condiments    UnitPrice=15.5000      UnitsInStock=39 
  Products: ProductID=44  ProductName=Gula Malacca        Category=Condiments    UnitPrice=19.4500      UnitsInStock=27 
  Products: ProductID=61  ProductName=Sirop d'érable      Category=Condiments    UnitPrice=28.5000      UnitsInStock=113 
  Products: ProductID=63  ProductName=Vegie-spread        Category=Condiments    UnitPrice=43.9000      UnitsInStock=24 
  Products: ProductID=65  ProductName=Louisiana Fiery Hot Pepper Sauce    Category=Condiments    UnitPrice=21.0500      UnitsInStock=76 
  Products: ProductID=66  ProductName=Louisiana Hot Spiced Okra  Category=Condiments    UnitPrice=17.0000      UnitsInStock=4 
  Products: ProductID=77  ProductName=Original Frankfurter grüne Soße    Category=Condiments    UnitPrice=13.0000      UnitsInStock=32 
Category=Meat/Poultry  Products=... 
  Products: ProductID=9  ProductName=Mishi Kobe Niku    Category=Meat/Poultry  UnitPrice=97.0000      UnitsInStock=29 
  Products: ProductID=17  ProductName=Alice Mutton        Category=Meat/Poultry  UnitPrice=39.0000      UnitsInStock=0 
  Products: ProductID=29  ProductName=Thüringer Rostbratwurst    Category=Meat/Poultry  UnitPrice=123.7900      UnitsInStock=0 
  Products: ProductID=53  ProductName=Perth Pasties      Category=Meat/Poultry  UnitPrice=32.8000      UnitsInStock=0 
  Products: ProductID=54  ProductName=Tourtière  Category=Meat/Poultry  UnitPrice=7.4500        UnitsInStock=21 
  Products: ProductID=55  ProductName=Pâté chinois        Category=Meat/Poultry  UnitPrice=24.0000      UnitsInStock=115 
Category=Dairy Products        Products=... 
  Products: ProductID=11  ProductName=Queso Cabrales      Category=Dairy Products        UnitPrice=21.0000      UnitsInStock=22 
  Products: ProductID=12  ProductName=Queso Manchego La Pastora  Category=Dairy Products        UnitPrice=38.0000      UnitsInStock=86 
  Products: ProductID=31  ProductName=Gorgonzola Telino  Category=Dairy Products        UnitPrice=12.5000      UnitsInStock=0 
  Products: ProductID=32  ProductName=Mascarpone Fabioli  Category=Dairy Products        UnitPrice=32.0000      UnitsInStock=9 
  Products: ProductID=33  ProductName=Geitost    Category=Dairy Products        UnitPrice=2.5000        UnitsInStock=112 
  Products: ProductID=59  ProductName=Raclette Courdavault        Category=Dairy Products        UnitPrice=55.0000      UnitsInStock=79 
  Products: ProductID=60  ProductName=Camembert Pierrot  Category=Dairy Products        UnitPrice=34.0000      UnitsInStock=19 
  Products: ProductID=69  ProductName=Gudbrandsdalsost    Category=Dairy Products        UnitPrice=36.0000      UnitsInStock=26 
  Products: ProductID=71  ProductName=Flotemysost        Category=Dairy Products        UnitPrice=21.5000      UnitsInStock=26 
  Products: ProductID=72  ProductName=Mozzarella di Giovanni      Category=Dairy Products        UnitPrice=34.8000      UnitsInStock=14

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