ArrayList.xml

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    <summary>Implements the <see cref="T:System.Collections.IList" /> interface using an array whose size is dynamically increased as required.</summary>
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      <format type="text/markdown"><![CDATA[

## Remarks

> [!IMPORTANT]
> We don't recommend that you use the `ArrayList` class for new development. Instead, we recommend that you use the generic <xref:System.Collections.Generic.List`1> class.
> The <xref:System.Collections.ArrayList> class is designed to hold heterogeneous collections of objects. However, it does not always offer the best performance. Instead, we recommend the following:
> - For a heterogeneous collection of objects, use the `List<Object>` (in C#) or `List(Of Object)` (in Visual Basic) type.
> - For a homogeneous collection of objects, use the <xref:System.Collections.Generic.List`1> class.
> See [Performance Considerations](xref:System.Collections.Generic.List`1#performance-considerations) in the <xref:System.Collections.Generic.List`1> reference topic for a discussion of the relative performance of these classes. See [Non-generic collections shouldn't be used](https://github.com/dotnet/platform-compat/blob/master/docs/DE0006.md) on GitHub for general information on the use of generic instead of non-generic collection types.

 The <xref:System.Collections.ArrayList> is not guaranteed to be sorted. You must sort the <xref:System.Collections.ArrayList> by calling its <xref:System.Collections.ArrayList.Sort*> method prior to performing operations (such as <xref:System.Collections.ArrayList.BinarySearch*>) that require the <xref:System.Collections.ArrayList> to be sorted. To maintain a collection that is automatically sorted as new elements are added, you can use the <xref:System.Collections.Generic.SortedSet`1> class.

 The capacity of an <xref:System.Collections.ArrayList> is the number of elements the <xref:System.Collections.ArrayList> can hold. As elements are added to an <xref:System.Collections.ArrayList>, the capacity is automatically increased as required through reallocation. The capacity can be decreased by calling <xref:System.Collections.ArrayList.TrimToSize*> or by setting the <xref:System.Collections.ArrayList.Capacity> property explicitly.

 **.NET Framework only:** For very large <xref:System.Collections.ArrayList> objects, you can increase the maximum capacity to 2 billion elements on a 64-bit system by setting the `enabled` attribute of the [`<gcAllowVeryLargeObjects>`](/dotnet/framework/configure-apps/file-schema/runtime/gcallowverylargeobjects-element) configuration element to `true` in the run-time environment.

 Elements in this collection can be accessed using an integer index. Indexes in this collection are zero-based.

 The <xref:System.Collections.ArrayList> collection accepts `null` as a valid value. It also allows duplicate elements.

 Using multidimensional arrays as elements in an <xref:System.Collections.ArrayList> collection is not supported.

## Examples
 The following example shows how to create and initialize an <xref:System.Collections.ArrayList> and how to display its values.

 :::code language="csharp" source="~/snippets/csharp/System.Collections/ArrayList/Overview/source.cs" id="Snippet1":::
 :::code language="vb" source="~/snippets/visualbasic/System.Collections/ArrayList/Overview/source.vb" id="Snippet1":::

 ]]></format>
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    <threadsafe>Public static (<see langword="Shared" /> in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

 An <see cref="T:System.Collections.ArrayList" /> can support multiple readers concurrently, as long as the collection is not modified. To guarantee the thread safety of the <see cref="T:System.Collections.ArrayList" />, all operations must be done through the wrapper returned by the <see cref="M:System.Collections.ArrayList.Synchronized(System.Collections.IList)" /> method.

 Enumerating through a collection is intrinsically not a thread-safe procedure. Even when a collection is synchronized, other threads can still modify the collection, which causes the enumerator to throw an exception. To guarantee thread safety during enumeration, you can either lock the collection during the entire enumeration or catch the exceptions resulting from changes made by other threads.</threadsafe>
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    <related type="Article" href="/dotnet/standard/globalization-localization/performing-culture-insensitive-string-operations-in-collections">Performing Culture-Insensitive String Operations in Collections</related>
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## Remarks
 The capacity of an <xref:System.Collections.ArrayList> is the number of elements that the <xref:System.Collections.ArrayList> can hold. As elements are added to an <xref:System.Collections.ArrayList>, the capacity is automatically increased as required by reallocating the internal array.

 If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the <xref:System.Collections.ArrayList>.

 This constructor is an `O(1)` operation.

 ]]></format>
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## Remarks
 The capacity of an <xref:System.Collections.ArrayList> is the number of elements that the <xref:System.Collections.ArrayList> can hold. As elements are added to an <xref:System.Collections.ArrayList>, the capacity is automatically increased as required by reallocating the internal array.

 If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the <xref:System.Collections.ArrayList>.

 The elements are copied onto the <xref:System.Collections.ArrayList> in the same order they are read by the <xref:System.Collections.IEnumerator> of the <xref:System.Collections.ICollection>.

 This constructor is an `O(n)` operation, where `n` is the number of elements in `c`.

 ]]></format>
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        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The capacity of an <xref:System.Collections.ArrayList> is the number of elements that the <xref:System.Collections.ArrayList> can hold. As elements are added to an <xref:System.Collections.ArrayList>, the capacity is automatically increased as required by reallocating the internal array.

 If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the <xref:System.Collections.ArrayList>.

 This constructor is an `O(n)` operation, where `n` is `capacity`.

> [!CAUTION]
> If `capacity` comes from user input, prefer using the parameterless constructor and letting the collection resize as elements are added. If you must use a user-specified value, either clamp it to a reasonable limit (for example, `Math.Clamp(untrustedValue, 0, 20)`) or verify that the element count matches the specified value.

 ]]></format>
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<xref:System.Collections.ArrayList.Adapter*> does not copy the contents of <xref:System.Collections.IList>. Instead, it only creates an <xref:System.Collections.ArrayList> wrapper around <xref:System.Collections.IList>; therefore, changes to the <xref:System.Collections.IList> also affect the <xref:System.Collections.ArrayList>.

The <xref:System.Collections.ArrayList> class provides generic <xref:System.Collections.ArrayList.Reverse*>, <xref:System.Collections.ArrayList.BinarySearch*> and <xref:System.Collections.ArrayList.Sort*> methods. This wrapper can be a means to use those methods on <xref:System.Collections.IList>; however, performing these generic operations through the wrapper might be less efficient than operations applied directly on the <xref:System.Collections.IList>.

This method is an `O(1)` operation.
      ]]></format>
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        <param name="value">The <see cref="T:System.Object" /> to be added to the end of the <see cref="T:System.Collections.ArrayList" />. The value can be <see langword="null" />.</param>
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## Remarks
 <xref:System.Collections.ArrayList> accepts `null` as a valid value and allows duplicate elements.

 If <xref:System.Collections.ArrayList.Count*> already equals <xref:System.Collections.ArrayList.Capacity*>, the capacity of the <xref:System.Collections.ArrayList> is increased by automatically reallocating the internal array, and the existing elements are copied to the new array before the new element is added.

 If <xref:System.Collections.ArrayList.Count*> is less than <xref:System.Collections.ArrayList.Capacity*>, this method is an `O(1)` operation. If the capacity needs to be increased to accommodate the new element, this method becomes an `O(n)` operation, where `n` is <xref:System.Collections.ArrayList.Count*>.



## Examples
 The following code example shows how to add elements to the <xref:System.Collections.ArrayList>.

 :::code language="csharp" source="~/snippets/csharp/System.Collections/ArrayList/Add/source.cs" id="Snippet1":::
 :::code language="vb" source="~/snippets/visualbasic/System.Collections/ArrayList/Add/source.vb" id="Snippet1":::

 ]]></format>
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        <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.ArrayList" /> is read-only.

 -or-

 The <see cref="T:System.Collections.ArrayList" /> has a fixed size.</exception>
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        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 <xref:System.Collections.ArrayList> accepts `null` as a valid value and allows duplicate elements.

 The order of the elements in the <xref:System.Collections.ICollection> is preserved in the <xref:System.Collections.ArrayList>.

 If the new <xref:System.Collections.ArrayList.Count*> (the current <xref:System.Collections.ArrayList.Count*> plus the size of the collection) will be greater than <xref:System.Collections.ArrayList.Capacity*>, the capacity of the <xref:System.Collections.ArrayList> is increased by automatically reallocating the internal array to accommodate the new elements, and the existing elements are copied to the new array before the new elements are added.

 If the <xref:System.Collections.ArrayList> can accommodate the new elements without increasing the <xref:System.Collections.ArrayList.Capacity*>, this method is an `O(n)` operation, where `n` is the number of elements to be added. If the capacity needs to be increased to accommodate the new elements, this method becomes an `O(n + m)` operation, where `n` is the number of elements to be added and `m` is <xref:System.Collections.ArrayList.Count*>.



## Examples
 The following code example shows how to add elements to the <xref:System.Collections.ArrayList>.

 :::code language="csharp" source="~/snippets/csharp/System.Collections/ArrayList/Add/source.cs" id="Snippet1":::
 :::code language="vb" source="~/snippets/visualbasic/System.Collections/ArrayList/Add/source.vb" id="Snippet1":::

 ]]></format>
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 -or-

 The <see cref="T:System.Collections.ArrayList" /> has a fixed size.</exception>
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        <returns>The zero-based index of <paramref name="value" /> in the sorted <see cref="T:System.Collections.ArrayList" />, if <paramref name="value" /> is found; otherwise, a negative number, which is the bitwise complement of the index of the next element that is larger than <paramref name="value" /> or, if there is no larger element, the bitwise complement of <see cref="P:System.Collections.ArrayList.Count" />.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The `value` parameter and each element of the <xref:System.Collections.ArrayList> must implement the <xref:System.IComparable> interface, which is used for comparisons. The elements of the <xref:System.Collections.ArrayList> must already be sorted in increasing value according to the sort order defined by the <xref:System.IComparable> implementation; otherwise, the result might be incorrect.

 Comparing `null` with any type is allowed and does not generate an exception when using <xref:System.IComparable>. When sorting, `null` is considered to be less than any other object.

 If the <xref:System.Collections.ArrayList> contains more than one element with the same value, the method returns only one of the occurrences, and it might return any one of the occurrences, not necessarily the first one.

 If the <xref:System.Collections.ArrayList> does not contain the specified value, the method returns a negative integer. You can apply the bitwise complement operation (~) to this negative integer to get the index of the first element that is larger than the search value. When inserting the value into the <xref:System.Collections.ArrayList>, this index should be used as the insertion point to maintain the sort order.

 This method is an `O(log n)` operation, where `n` is <xref:System.Collections.ArrayList.Count*>.

## Examples
 The following code example shows how to use <xref:System.Collections.ArrayList.BinarySearch*> to locate a specific object in the <xref:System.Collections.ArrayList>.

 :::code language="csharp" source="~/snippets/csharp/System.Collections/ArrayList/BinarySearch/source.cs" id="Snippet1":::
 :::code language="vb" source="~/snippets/visualbasic/System.Collections/ArrayList/BinarySearch/source.vb" id="Snippet1":::

 ]]></format>
        </remarks>
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        <exception cref="T:System.InvalidOperationException">
          <paramref name="value" /> is not of the same type as the elements of the <see cref="T:System.Collections.ArrayList" />.</exception>
        <related type="Article" href="/dotnet/standard/globalization-localization/performing-culture-insensitive-string-operations-in-collections">Performing Culture-Insensitive String Operations in Collections</related>
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        <param name="value">The <see cref="T:System.Object" /> to locate. The value can be <see langword="null" />.</param>
        <param name="comparer">The <see cref="T:System.Collections.IComparer" /> implementation to use when comparing elements.

 -or-

 <see langword="null" /> to use the default comparer that is the <see cref="T:System.IComparable" /> implementation of each element.</param>
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          <format type="text/markdown"><![CDATA[

## Remarks
 The comparer customizes how the elements are compared. For example, you can use a <xref:System.Collections.CaseInsensitiveComparer> instance as the comparer to perform case-insensitive string searches.

 If `comparer` is provided, the elements of the <xref:System.Collections.ArrayList> are compared to the specified value using the specified <xref:System.Collections.IComparer> implementation. The elements of the <xref:System.Collections.ArrayList> must already be sorted in increasing value according to the sort order defined by `comparer`; otherwise, the result might be incorrect.

 If `comparer` is `null`, the comparison is done using the <xref:System.IComparable> implementation provided by the element itself or by the specified value. The elements of the <xref:System.Collections.ArrayList> must already be sorted in increasing value according to the sort order defined by the <xref:System.IComparable> implementation; otherwise, the result might be incorrect.

 Comparing `null` with any type is allowed and does not generate an exception when using <xref:System.IComparable>. When sorting, `null` is considered to be less than any other object.

 If the <xref:System.Collections.ArrayList> contains more than one element with the same value, the method returns only one of the occurrences, and it might return any one of the occurrences, not necessarily the first one.

 If the <xref:System.Collections.ArrayList> does not contain the specified value, the method returns a negative integer. You can apply the bitwise complement operation (~) to this negative integer to get the index of the first element that is larger than the search value. When inserting the value into the <xref:System.Collections.ArrayList>, this index should be used as the insertion point to maintain the sort order.

 This method is an `O(log n)` operation, where `n` is <xref:System.Collections.ArrayList.Count*>.

## Examples
 The following example creates an <xref:System.Collections.ArrayList> of colored animals. The provided <xref:System.Collections.IComparer> performs the string comparison for the binary search. The results of both an iterative search and a binary search are displayed.

 :::code language="csharp" source="~/snippets/csharp/System.Collections/ArrayList/BinarySearch/source2.cs" id="Snippet2":::
 :::code language="vb" source="~/snippets/visualbasic/System.Collections/ArrayList/BinarySearch/source2.vb" id="Snippet2":::

 ]]></format>
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        <exception cref="T:System.InvalidOperationException">
          <paramref name="comparer" /> is <see langword="null" /> and <paramref name="value" /> is not of the same type as the elements of the <see cref="T:System.Collections.ArrayList" />.</exception>
        <related type="Article" href="/dotnet/standard/globalization-localization/performing-culture-insensitive-string-operations-in-collections">Performing Culture-Insensitive String Operations in Collections</related>
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 -or-

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## Remarks
 The comparer customizes how the elements are compared. For example, you can use a <xref:System.Collections.CaseInsensitiveComparer> instance as the comparer to perform case-insensitive string searches.

 If `comparer` is provided, the elements of the <xref:System.Collections.ArrayList> are compared to the specified value using the specified <xref:System.Collections.IComparer> implementation. The elements of the <xref:System.Collections.ArrayList> must already be sorted in increasing value according to the sort order defined by `comparer`; otherwise, the result might be incorrect.

 If `comparer` is `null`, the comparison is done using the <xref:System.IComparable> implementation provided by the element itself or by the specified value. The elements of the <xref:System.Collections.ArrayList> must already be sorted in increasing value according to the sort order defined by the <xref:System.IComparable> implementation; otherwise, the result might be incorrect.

 Comparing `null` with any type is allowed and does not generate an exception when using <xref:System.IComparable>. When sorting, `null` is considered to be less than any other object.

 If the <xref:System.Collections.ArrayList> contains more than one element with the same value, the method returns only one of the occurrences, and it might return any one of the occurrences, not necessarily the first one.

 If the <xref:System.Collections.ArrayList> does not contain the specified value, the method returns a negative integer. You can apply the bitwise complement operation (~) to this negative integer to get the index of the first element that is larger than the search value. When inserting the value into the <xref:System.Collections.ArrayList>, this index should be used as the insertion point to maintain the sort order.

 This method is an `O(log n)` operation, where `n` is `count`.

 ]]></format>
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 -or-

 <paramref name="count" /> is less than zero.</exception>
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        <related type="Article" href="/dotnet/standard/globalization-localization/performing-culture-insensitive-string-operations-in-collections">Performing Culture-Insensitive String Operations in Collections</related>
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## Remarks
 <xref:System.Collections.ArrayList.Capacity*> is the number of elements that the <xref:System.Collections.ArrayList> can store. <xref:System.Collections.ArrayList.Count*> is the number of elements that are actually in the <xref:System.Collections.ArrayList>.

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 The capacity can be decreased by calling <xref:System.Collections.ArrayList.TrimToSize*> or by setting the <xref:System.Collections.ArrayList.Capacity> property explicitly. When the value of <xref:System.Collections.ArrayList.Capacity*> is set explicitly, the internal array is also reallocated to accommodate the specified capacity.

 Retrieving the value of this property is an `O(1)` operation; setting the property is an `O(n)` operation, where `n` is the new capacity.

 ]]></format>
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