Queryable.Union Method

Source:

Queryable.cs

Source:

Queryable.cs

Source:

Queryable.cs

Source:

Queryable.cs

Source:

Queryable.cs

public:
generic 
[System::Runtime::CompilerServices::Extension]
 static System::Linq::IQueryable ^ Union(System::Linq::IQueryable ^ source1, System::Collections::Generic::IEnumerable ^ source2);

public static System.Linq.IQueryable Union(this System.Linq.IQueryable source1, System.Collections.Generic.IEnumerable source2);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
public static System.Linq.IQueryable Union(this System.Linq.IQueryable source1, System.Collections.Generic.IEnumerable source2);

static member Union : System.Linq.IQueryable<'Source> * seq<'Source> -> System.Linq.IQueryable<'Source>

[]
static member Union : System.Linq.IQueryable<'Source> * seq<'Source> -> System.Linq.IQueryable<'Source>

Public Function Union(Of TSource) (source1 As IQueryable(Of TSource), source2 As IEnumerable(Of TSource)) As IQueryable(Of TSource)

Type Parameters

Parameters

Returns

An IQueryable that contains the elements from both input sequences, excluding duplicates.

Attributes

RequiresDynamicCodeAttribute

Exceptions

Examples

The following code example demonstrates how to use Union(IQueryable, IEnumerable) to obtain the set union of two sequences.

int[] ints1 = { 5, 3, 9, 7, 5, 9, 3, 7 };
int[] ints2 = { 8, 3, 6, 4, 4, 9, 1, 0 };

// Get the set union of the items in the two arrays.
IEnumerable union = ints1.AsQueryable().Union(ints2);

foreach (int num in union)
    Console.Write("{0} ", num);

/*
    This code produces the following output:

    5 3 9 7 8 6 4 1 0
*/

Dim ints1() As Integer = {5, 3, 9, 7, 5, 9, 3, 7}
Dim ints2() As Integer = {8, 3, 6, 4, 4, 9, 1, 0}

' Get the set union of the items in the two arrays.
Dim union = ints1.AsQueryable().Union(ints2)

Dim output As New System.Text.StringBuilder
For Each num As Integer In union
    output.Append(String.Format("{0} ", num))
Next

' Display the output.
MsgBox(output.ToString())

' This code produces the following output:

' 5 3 9 7 8 6 4 1 0

Remarks

The Union(IQueryable, IEnumerable) method generates a MethodCallExpression that represents calling Union(IQueryable, IEnumerable) itself as a constructed generic method. It then passes the MethodCallExpression to the CreateQuery(Expression) method of the IQueryProvider represented by the Provider property of the source1 parameter.

The query behavior that occurs as a result of executing an expression tree that represents calling Union(IQueryable, IEnumerable) depends on the implementation of the type of the source1 parameter. The expected behavior is that the set union of the elements in source1 and source2 is returned.

Source:

Queryable.cs

Source:

Queryable.cs

Source:

Queryable.cs

Source:

Queryable.cs

Source:

Queryable.cs

public:
generic 
[System::Runtime::CompilerServices::Extension]
 static System::Linq::IQueryable ^ Union(System::Linq::IQueryable ^ source1, System::Collections::Generic::IEnumerable ^ source2, System::Collections::Generic::IEqualityComparer ^ comparer);

public static System.Linq.IQueryable Union(this System.Linq.IQueryable source1, System.Collections.Generic.IEnumerable source2, System.Collections.Generic.IEqualityComparer comparer);

public static System.Linq.IQueryable Union(this System.Linq.IQueryable source1, System.Collections.Generic.IEnumerable source2, System.Collections.Generic.IEqualityComparer? comparer);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Enumerating collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
public static System.Linq.IQueryable Union(this System.Linq.IQueryable source1, System.Collections.Generic.IEnumerable source2, System.Collections.Generic.IEqualityComparer? comparer);

static member Union : System.Linq.IQueryable<'Source> * seq<'Source> * System.Collections.Generic.IEqualityComparer<'Source> -> System.Linq.IQueryable<'Source>

[]
static member Union : System.Linq.IQueryable<'Source> * seq<'Source> * System.Collections.Generic.IEqualityComparer<'Source> -> System.Linq.IQueryable<'Source>

Public Function Union(Of TSource) (source1 As IQueryable(Of TSource), source2 As IEnumerable(Of TSource), comparer As IEqualityComparer(Of TSource)) As IQueryable(Of TSource)

Type Parameters

Parameters

Returns

An IQueryable that contains the elements from both input sequences, excluding duplicates.

Attributes

RequiresDynamicCodeAttribute

Exceptions

Remarks

The Union(IQueryable, IEnumerable, IEqualityComparer) method generates a MethodCallExpression that represents calling Union(IQueryable, IEnumerable, IEqualityComparer) itself as a constructed generic method. It then passes the MethodCallExpression to the CreateQuery(Expression) method of the IQueryProvider represented by the Provider property of the source1 parameter.

The query behavior that occurs as a result of executing an expression tree that represents calling Union(IQueryable, IEnumerable, IEqualityComparer) depends on the implementation of the type of the source1 parameter. The expected behavior is that the set union of the elements in source1 and source2 is returned. The comparer parameter is used to compare values.