C# Eval Expression LINQ Dynamic - Max

LINQ Dynamic Max Examples

C# Dynamic LINQ Max examples using an Expression Evaluator.

Max - Simple

This C# example uses the LINQ Max method with a dynamic expression to get the highest number in an array.

LINQ

private void uiMax_Simple_LINQ_Click(object sender, EventArgs e)
{
	int[] numbers = {5, 4, 1, 3, 9, 8, 6, 7, 2, 0};

	var maxNum = numbers.Max();

	var sb = new StringBuilder();

	sb.AppendLine("The maximum number is {0}.", maxNum);

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

LINQ Execute

private void uiMax_Simple_LINQ_Execute_Click(object sender, EventArgs e)
{
	int[] numbers = {5, 4, 1, 3, 9, 8, 6, 7, 2, 0};

	var maxNum = numbers.Execute<int>("Max()");

	var sb = new StringBuilder();

	sb.AppendLine("The maximum number is {0}.", maxNum);

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

Result

The maximum number is 9.

Max - Projection

This C# example uses the LINQ Max method with a dynamic expression to get the length of the longest word in an array.

LINQ

private void uiMax_Projection_LINQ_Click(object sender, EventArgs e)
{
	string[] words = {"cherry", "apple", "blueberry"};

	var longestLength = words.Max(w => w.Length);

	var sb = new StringBuilder();

	sb.AppendLine("The longest word is {0} characters long.", longestLength);

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

LINQ Execute

private void uiMax_Projection_LINQ_Execute_Click(object sender, EventArgs e)
{
	string[] words = {"cherry", "apple", "blueberry"};

	var longestLength = words.Execute<int>("Max(w => w.Length)");

	var sb = new StringBuilder();

	sb.AppendLine("The longest word is {0} characters long.", longestLength);

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

Result

The longest word is 9 characters long.

Max - Grouped

This C# example uses the LINQ Max method with a dynamic expression to get the most expensive price among each category's products.

LINQ

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

	var categories = products.GroupBy(p => p.Category).Select(g => new {Category = g.Key, MostExpensivePrice = g.Max(p => p.UnitPrice)});

	var sb = new StringBuilder();

	My.ObjectDumper.Write(sb, categories);

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

LINQ Execute

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

	var categories = products.Execute("GroupBy(p => p.Category).Select(g => new { Category = g.Key, MostExpensivePrice = g.Max(p => p.UnitPrice) })");

	var sb = new StringBuilder();

	My.ObjectDumper.Write(sb, categories);

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

Result

Category=Beverages 
Category=Condiments 
Category=Produce 
Category=Meat/Poultry 
Category=Seafood 
Category=Dairy Products 
Category=Confections 
Category=Grains/Cereals	MostExpensivePrice=263.5000 
MostExpensivePrice=43.9000 
MostExpensivePrice=53.0000 
MostExpensivePrice=123.7900 
MostExpensivePrice=62.5000 
MostExpensivePrice=55.0000 
MostExpensivePrice=81.0000 
MostExpensivePrice=38.0000

Max - Elements

This C# example uses the LINQ Max method with a dynamic expression to get the products with the most expensive price in each category.

LINQ

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

	var categories = products.GroupBy(p => p.Category).Select(g => new { Category = g.Key, MostExpensiveProducts = g.Where(p => p.UnitPrice == g.Max(p2 => p2.UnitPrice)) });

	var sb = new StringBuilder();

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

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

LINQ Execute

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

	var categories = products.Execute("GroupBy(p => p.Category).Select(g => new { Category = g.Key, MostExpensiveProducts = g.Where(p => p.UnitPrice == g.Max(p2 => p2.UnitPrice)) })");

	var sb = new StringBuilder();

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

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

Result

Category=Beverages      MostExpensiveProducts=... 
  MostExpensiveProducts: ProductID=38    ProductName=Côte de Blaye      Category=Beverages      UnitPrice=263.5000      UnitsInStock=17 
Category=Condiments    MostExpensiveProducts=... 
  MostExpensiveProducts: ProductID=63    ProductName=Vegie-spread        Category=Condiments    UnitPrice=43.9000      UnitsInStock=24 
Category=Produce        MostExpensiveProducts=... 
  MostExpensiveProducts: ProductID=51    ProductName=Manjimup Dried Apples      Category=Produce        UnitPrice=53.0000      UnitsInStock=20 
Category=Meat/Poultry  MostExpensiveProducts=... 
  MostExpensiveProducts: ProductID=29    ProductName=Thüringer Rostbratwurst    Category=Meat/Poultry  UnitPrice=123.7900      UnitsInStock=0 
Category=Seafood        MostExpensiveProducts=... 
  MostExpensiveProducts: ProductID=18    ProductName=Carnarvon Tigers    Category=Seafood        UnitPrice=62.5000      UnitsInStock=42 
Category=Dairy Products        MostExpensiveProducts=... 
  MostExpensiveProducts: ProductID=59    ProductName=Raclette Courdavault        Category=Dairy Products        UnitPrice=55.0000      UnitsInStock=79 
Category=Confections    MostExpensiveProducts=... 
  MostExpensiveProducts: ProductID=20    ProductName=Sir Rodney's Marmalade      Category=Confections    UnitPrice=81.0000      UnitsInStock=40 
Category=Grains/Cereals        MostExpensiveProducts=... 
  MostExpensiveProducts: ProductID=56    ProductName=Gnocchi di nonna Alice      Category=Grains/Cereals        UnitPrice=38.0000      UnitsInStock=21

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