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60 lines
3.8 KiB
Markdown
60 lines
3.8 KiB
Markdown
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# LeftOuterJoin<T, U, TKey, R>(IQueryable<T>, IQueryable<U>, Expression<Func<T, TKey>>, Expression<Func<U, TKey>>, Expression<Func<T, IEnumerable<U>, R>>) Method
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An IQueryable<T> extension method that left outer join.
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## Definition
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**Namespace:** <a href="N_CapyKit_Extensions.md">CapyKit.Extensions</a>
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**Assembly:** CapyKit (in CapyKit.dll) Version: 1.0.0+735d7c4c91a8ae04c2d8cae4ce85ddf4909e5b7d
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**C#**
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``` C#
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private static IQueryable<R> LeftOuterJoin<T, U, TKey, R>(
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this IQueryable<T> source,
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IQueryable<U> inner,
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Expression<Func<T, TKey>> outerSelector,
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Expression<Func<U, TKey>> innerSelector,
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Expression<Func<T, IEnumerable<U>, R>> resultSelector
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)
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```
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**F#**
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``` F#
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[<ExtensionAttribute>]
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private static member LeftOuterJoin :
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source : IQueryable<'T> *
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inner : IQueryable<'U> *
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outerSelector : Expression<Func<'T, 'TKey>> *
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innerSelector : Expression<Func<'U, 'TKey>> *
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resultSelector : Expression<Func<'T, IEnumerable<'U>, 'R>> -> IQueryable<'R>
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```
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#### Parameters
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<dl><dt> <a href="https://learn.microsoft.com/dotnet/api/system.linq.iqueryable-1" target="_blank" rel="noopener noreferrer">IQueryable</a>(T)</dt><dd>The source to act on.</dd><dt> <a href="https://learn.microsoft.com/dotnet/api/system.linq.iqueryable-1" target="_blank" rel="noopener noreferrer">IQueryable</a>(U)</dt><dd>The inner.</dd><dt> <a href="https://learn.microsoft.com/dotnet/api/system.linq.expressions.expression-1" target="_blank" rel="noopener noreferrer">Expression</a>(<a href="https://learn.microsoft.com/dotnet/api/system.func-2" target="_blank" rel="noopener noreferrer">Func</a>(T, TKey))</dt><dd>The outer selector.</dd><dt> <a href="https://learn.microsoft.com/dotnet/api/system.linq.expressions.expression-1" target="_blank" rel="noopener noreferrer">Expression</a>(<a href="https://learn.microsoft.com/dotnet/api/system.func-2" target="_blank" rel="noopener noreferrer">Func</a>(U, TKey))</dt><dd>The inner selector.</dd><dt> <a href="https://learn.microsoft.com/dotnet/api/system.linq.expressions.expression-1" target="_blank" rel="noopener noreferrer">Expression</a>(<a href="https://learn.microsoft.com/dotnet/api/system.func-3" target="_blank" rel="noopener noreferrer">Func</a>(T, <a href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1" target="_blank" rel="noopener noreferrer">IEnumerable</a>(U), R))</dt><dd>The result selector.</dd></dl>
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#### Type Parameters
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<dl><dt /><dd>Generic type parameter.</dd><dt /><dd>Generic type parameter.</dd><dt /><dd>Type of the key.</dd><dt /><dd>Type of the r.</dd></dl>
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#### Return Value
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<a href="https://learn.microsoft.com/dotnet/api/system.linq.iqueryable-1" target="_blank" rel="noopener noreferrer">IQueryable</a>(R)
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An IQueryable<R>
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#### Usage Note
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In Visual Basic and C#, you can call this method as an instance method on any object of type <a href="https://learn.microsoft.com/dotnet/api/system.linq.iqueryable-1" target="_blank" rel="noopener noreferrer">IQueryable</a>(T). When you use instance method syntax to call this method, omit the first parameter. For more information, see <a href="https://docs.microsoft.com/dotnet/visual-basic/programming-guide/language-features/procedures/extension-methods" target="_blank" rel="noopener noreferrer">
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Extension Methods (Visual Basic)</a> or <a href="https://docs.microsoft.com/dotnet/csharp/programming-guide/classes-and-structs/extension-methods" target="_blank" rel="noopener noreferrer">
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Extension Methods (C# Programming Guide)</a>.
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## See Also
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#### Reference
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<a href="T_CapyKit_Extensions_LINQExtensions.md">LINQExtensions Class</a>
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<a href="Overload_CapyKit_Extensions_LINQExtensions_LeftOuterJoin.md">LeftOuterJoin Overload</a>
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<a href="N_CapyKit_Extensions.md">CapyKit.Extensions Namespace</a>
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