C# Eval Expression LINQ Dynamic - Union

LINQ Dynamic Union Examples

C# Dynamic LINQ Union examples using an Expression Evaluator.

Union - 1

This C# example uses the LINQ Union method with a dynamic expression to create one sequence that contains the unique values from both arrays.

LINQ

private void uiUnion_1_LINQ_Click(object sender, EventArgs e)
{
	int[] numbersA = {0, 2, 4, 5, 6, 8, 9};
	int[] numbersB = {1, 3, 5, 7, 8};

	var uniqueNumbers = numbersA.Union(numbersB);

	var sb = new StringBuilder();

	sb.AppendLine("Unique numbers from both arrays:");
		foreach (var n in uniqueNumbers)
		{
			sb.AppendLine(n.ToString());
		}

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

LINQ Execute

private void uiUnion_1_LINQ_Execute_Click(object sender, EventArgs e)
{
	int[] numbersA = {0, 2, 4, 5, 6, 8, 9};
	int[] numbersB = {1, 3, 5, 7, 8};

	var uniqueNumbers = numbersA.Execute<IEnumerable<int>>("Union(numbersB)", new {numbersB});

	var sb = new StringBuilder();

	sb.AppendLine("Unique numbers from both arrays:");
		foreach (var n in uniqueNumbers)
		{
			sb.AppendLine(n.ToString());
		}

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

Result

highlight text %} LINQ Execute Test

Unique numbers from both arrays: 0 2 4 5 6 8 9 1 3 7


## Union - 2
This C# example uses the LINQ Union method with a dynamic expression to create one sequence that contains the unique first letter from both product and customer names.

### LINQ
```csharp
private void uiUnion_2_LINQ_Click(object sender, EventArgs e)
{
	var products = My.GetProductList();
	var customers = My.GetCustomerList();

	var productFirstChars = from p in products select p.ProductName[0];
	var customerFirstChars = from c in customers select c.CompanyName[0];

	var uniqueFirstChars = productFirstChars.Union(customerFirstChars);

	var sb = new StringBuilder();

	sb.AppendLine("Unique first letters from Product names and Customer names:");
		foreach (var ch in uniqueFirstChars)
		{
			sb.AppendLine(ch.ToString());
		}

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

LINQ Execute

private void uiUnion_2_LINQ_Execute_Click(object sender, EventArgs e)
{
	var products = My.GetProductList();
	var customers = My.GetCustomerList();

	var productFirstChars = from p in products select p.ProductName[0];
	var customerFirstChars = from c in customers select c.CompanyName[0];

	var uniqueFirstChars = productFirstChars.Execute<IEnumerable<char>>("Union(customerFirstChars)", new {customerFirstChars});

	var sb = new StringBuilder();

	sb.AppendLine("Unique first letters from Product names and Customer names:");
		foreach (var ch in uniqueFirstChars)
		{
			sb.AppendLine(ch.ToString());
		}

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

Result

highlight text %} LINQ Execute Test

Unique first letters from Product names and Customer names: C A G U N M I Q K T P S R B J Z V F E W L O D H

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