Update live with current master

docs/core/rid-catalog.md

@@ -3,7 +3,7 @@ title: .NET Core Runtime IDentifier (RID) catalog
 description: Learn about the Runtime IDentifier (RID) and how RIDs are used in .NET Core.
 author: mairaw
 ms.author: mairaw
-ms.date: 09/07/2017
+ms.date: 07/19/2018
 ---
 # .NET Core RID Catalog
 
@@ -116,22 +116,24 @@ See [Prerequisites for .NET Core on Windows](windows-prerequisites.md) for more
 - Debian
   - `debian-x64`
   - `debian.8-x64`
+  - `debian.9-x64` (.NET Core 1.1 or later versions)
 - Fedora
   - `fedora-x64`
-  - `fedora.24-x64`
-  - `fedora.25-x64` (.NET Core 2.0 or later versions)
-  - `fedora.26-x64` (.NET Core 2.0 or later versions)
+  - `fedora.27-x64`
+  - `fedora.28-x64` (.NET Core 1.1 or later versions)
 - Gentoo (.NET Core 2.0 or later versions)
   - `gentoo-x64`
 - openSUSE
   - `opensuse-x64`
-  - `opensuse.42.1-x64`
+  - `opensuse.42.3-x64`
 - Oracle Linux
   - `ol-x64`
   - `ol.7-x64`
   - `ol.7.0-x64`
   - `ol.7.1-x64`
   - `ol.7.2-x64`
+  - `ol.7.3-x64`
+  - `ol.7.4-x64`
 - Red Hat Enterprise Linux
   - `rhel-x64`
   - `rhel.6-x64` (.NET Core 2.0 or later versions)
@@ -142,21 +144,32 @@ See [Prerequisites for .NET Core on Windows](windows-prerequisites.md) for more
   - `rhel.7.4-x64` (.NET Core 2.0 or later versions)
 - Tizen (.NET Core 2.0 or later versions)
   - `tizen`
+  - `tizen.4.0.0`
+  - `tizen.5.0.0`
 - Ubuntu
   - `ubuntu-x64`
   - `ubuntu.14.04-x64`
-  - `ubuntu.14.10-x64`
-  - `ubuntu.15.04-x64`
-  - `ubuntu.15.10-x64`
   - `ubuntu.16.04-x64`
-  - `ubuntu.16.10-x64`
+  - `ubuntu.17.10-x64`
+  - `ubuntu.18.04-x64`
 - Ubuntu derivatives
   - `linuxmint.17-x64`
   - `linuxmint.17.1-x64`
   - `linuxmint.17.2-x64`
   - `linuxmint.17.3-x64`
-  - `linuxmint.18-x64`
+  - `linuxmint.18-x64` (.NET Core 2.0 or later versions)
   - `linuxmint.18.1-x64` (.NET Core 2.0 or later versions)
+  - `linuxmint.18.2-x64` (.NET Core 2.0 or later versions)
+  - `linuxmint.18.3-x64` (.NET Core 2.0 or later versions)
+- SUSE Enterprise Linux (SLES) (.NET Core 2.0 or later versions)
+  - `sles-x64`
+  - `sles.12-x64`
+  - `sles.12.1-x64`
+  - `sles.12.2-x64`
+  - `sles.12.3-x64`
+- Alpine Linux (.NET Core 2.1 or later versions)
+  - `alpine-x64`
+  - `alpine.3.7-x64`
 
 See [Prerequisites for .NET Core on Linux](linux-prerequisites.md) for more information.
 

docs/csharp/programming-guide/classes-and-structs/object-and-collection-initializers.md

@@ -38,9 +38,6 @@ foreach(var p in productInfos){...}
 select new {p.ProductName, Price = p.UnitPrice};  
 ```  
 
-## Object initializers with nullable types  
- It is a compile-time error to use an object initializer with a nullable struct.  
-
 ## Collection initializers  
  Collection initializers let you specify one or more element initializers when you initialize a collection type that implements <xref:System.Collections.IEnumerable> and has `Add` with the appropriate signature as an instance method or an extension method. The element initializers can be a simple value, an expression or an object initializer. By using a collection initializer you do not have to specify multiple calls to the `Add` method of the class in your source code; the compiler adds the calls.  
 

docs/standard/collections/thread-safe/how-to-add-and-remove-items.md

@@ -30,15 +30,15 @@ This example shows how to add, retrieve, update, and remove items from a <xref:S
 
  <xref:System.Collections.Concurrent.ConcurrentDictionary%602> is designed for multithreaded scenarios. You do not have to use locks in your code to add or remove items from the collection. However, it is always possible for one thread to retrieve a value, and another thread to immediately update the collection by giving the same key a new value.  
 
- Also, although all methods of <xref:System.Collections.Concurrent.ConcurrentDictionary%602> are thread-safe, not all methods are atomic, specifically <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%2A> and <xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%2A>. The user delegate that is passed to these methods is invoked outside of the dictionary's internal lock. (This is done to prevent unknown code from blocking all threads.) Therefore it is possible for this sequence of events to occur:  
+ Also, although all methods of <xref:System.Collections.Concurrent.ConcurrentDictionary%602> are thread-safe, not all methods are atomic, specifically <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%2A> and <xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%2A>. The user delegate that is passed to these methods is invoked outside of the dictionary's internal lock (this is done to prevent unknown code from blocking all threads). Therefore, it is possible for this sequence of events to occur:  
 
  1\) threadA calls <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%2A>, finds no item and creates a new item to Add by invoking the valueFactory delegate.  
 
  2\) threadB calls <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%2A> concurrently, its valueFactory delegate is invoked and it arrives at the internal lock before threadA, and so its new key-value pair is added to the dictionary.  
 
- 3\) threadA's user delegate completes, and the thread arrives at the lock, but now sees that the item exists already  
+ 3\) threadA's user delegate completes, and the thread arrives at the lock, but now sees that the item exists already.  
 
- 4\) threadA performs a "Get", and returns the data that was previously added by threadB.  
+ 4\) threadA performs a "Get" and returns the data that was previously added by threadB.  
 
  Therefore, it is not guaranteed that the data that is returned by <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%2A> is the same data that was created by the thread's valueFactory. A similar sequence of events can occur when <xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%2A> is called.  
 

docs/standard/serialization/schemaimporterextensions-element.md

@@ -15,7 +15,7 @@ Contains types that are used by the <xref:System.Xml.Serialization.XmlSchemaImpo
 ```xml  
 <schemaImporterExtensions>  
     <!-- Add types -->  
-</SchemaImporterExtension>  
+</schemaImporterExtensions>  
 ```  
 
 ## Child Elements  
@@ -41,7 +41,7 @@ Contains types that are used by the <xref:System.Xml.Serialization.XmlSchemaImpo
         System.Web.Mobile, Version - 2.0.0.0, Culture = neutral,   
         PublicKeyToken = b03f5f6f11d40a3a" />  
     </schemaImporterExtensions>  
-/system.sxml.serializaiton>  
+</system.xml.serialization>  
 ```  
 
 ## See Also  

docs/visual-basic/language-reference/queries/aggregate-clause.md

@@ -45,15 +45,15 @@ Aggregate element [As type] In collection _
 
 |Function|Description|  
 |---|---|  
-|`All`|Returns `true` if all elements in the collection satisfy a specified condition; otherwise returns `false`. Following is an example:<br /><br /> [!code-vb[VbSimpleQuerySamples#5](../../../visual-basic/language-reference/queries/codesnippet/VisualBasic/aggregate-clause_1.vb)]|  
-|`Any`|Returns `true` if any element in the collection satisfies a specified condition; otherwise returns `false`. Following is an example:<br /><br /> [!code-vb[VbSimpleQuerySamples#6](../../../visual-basic/language-reference/queries/codesnippet/VisualBasic/aggregate-clause_2.vb)]|  
-|`Average`|Computes the average of all elements in the collection, or a computes supplied expression for all elements in the collection. Following is an example:<br /><br /> [!code-vb[VbSimpleQuerySamples#7](../../../visual-basic/language-reference/queries/codesnippet/VisualBasic/aggregate-clause_3.vb)]|  
-|`Count`|Counts the number of elements in the collection. You can supply an optional `Boolean` expression to count only the number of elements in the collection that satisfy a condition. Following is an example:<br /><br /> [!code-vb[VbSimpleQuerySamples#8](../../../visual-basic/language-reference/queries/codesnippet/VisualBasic/aggregate-clause_4.vb)]|  
+|`All`|Returns `true` if all elements in the collection satisfy a specified condition; otherwise returns `false`. The following is an example:<br /><br /> [!code-vb[VbSimpleQuerySamples#5](../../../visual-basic/language-reference/queries/codesnippet/VisualBasic/aggregate-clause_1.vb)]|  
+|`Any`|Returns `true` if any element in the collection satisfies a specified condition; otherwise returns `false`. The following is an example:<br /><br /> [!code-vb[VbSimpleQuerySamples#6](../../../visual-basic/language-reference/queries/codesnippet/VisualBasic/aggregate-clause_2.vb)]|  
+|`Average`|Computes the average of all elements in the collection, or computes a supplied expression for all elements in the collection. The following is an example:<br /><br /> [!code-vb[VbSimpleQuerySamples#7](../../../visual-basic/language-reference/queries/codesnippet/VisualBasic/aggregate-clause_3.vb)]|  
+|`Count`|Counts the number of elements in the collection. You can supply an optional `Boolean` expression to count only the number of elements in the collection that satisfy a condition. The following is an example:<br /><br /> [!code-vb[VbSimpleQuerySamples#8](../../../visual-basic/language-reference/queries/codesnippet/VisualBasic/aggregate-clause_4.vb)]|  
 |`Group`|Refers to query results that are grouped as a result of a `Group By` or `Group Join` clause. The `Group` function is valid only in the `Into` clause of a `Group By` or `Group Join` clause. For more information and examples, see [Group By Clause](../../../visual-basic/language-reference/queries/group-by-clause.md) and [Group Join Clause](../../../visual-basic/language-reference/queries/group-join-clause.md).|  
 |`LongCount`|Counts the number of elements in the collection. You can supply an optional `Boolean` expression to count only the number of elements in the collection that satisfy a condition. Returns the result as a `Long`. For an example, see the `Count` aggregate function.|  
-|`Max`|Computes the maximum value from the collection, or computes a supplied expression for all elements in the collection. Following is an example:<br /><br /> [!code-vb[VbSimpleQuerySamples#9](../../../visual-basic/language-reference/queries/codesnippet/VisualBasic/aggregate-clause_5.vb)]|  
-|`Min`|Computes the minimum value from the collection, or computes a supplied expression for all elements in the collection. Following is an example:<br /><br /> [!code-vb[VbSimpleQuerySamples#10](../../../visual-basic/language-reference/queries/codesnippet/VisualBasic/aggregate-clause_6.vb)]|  
-|`Sum`|Computes the sum of all elements in the collection, or computes a supplied expression for all elements in the collection. Following is an example:<br /><br /> [!code-vb[VbSimpleQuerySamples#15](../../../visual-basic/language-reference/queries/codesnippet/VisualBasic/aggregate-clause_7.vb)]|  
+|`Max`|Computes the maximum value from the collection, or computes a supplied expression for all elements in the collection. The following is an example:<br /><br /> [!code-vb[VbSimpleQuerySamples#9](../../../visual-basic/language-reference/queries/codesnippet/VisualBasic/aggregate-clause_5.vb)]|  
+|`Min`|Computes the minimum value from the collection, or computes a supplied expression for all elements in the collection. The following is an example:<br /><br /> [!code-vb[VbSimpleQuerySamples#10](../../../visual-basic/language-reference/queries/codesnippet/VisualBasic/aggregate-clause_6.vb)]|  
+|`Sum`|Computes the sum of all elements in the collection, or computes a supplied expression for all elements in the collection. The following is an example:<br /><br /> [!code-vb[VbSimpleQuerySamples#15](../../../visual-basic/language-reference/queries/codesnippet/VisualBasic/aggregate-clause_7.vb)]|  
 
 ## Example  
  The following code example shows how to use the `Aggregate` clause to apply aggregate functions to a query result.