<gcAllowVeryLargeObjects> element

Artikkeli
05/25/2022

On 64-bit platforms, enables arrays that are greater than 2 gigabytes (GB) in total size.

<configuration>
<runtime>
<gcAllowVeryLargeObjects>

Syntax

<gcAllowVeryLargeObjects enabled="true|false" />

Attributes

Attribute	Description
`enabled`	Required attribute. Specifies whether arrays that are greater than 2 GB in total size are enabled on 64-bit platforms.

enabled attribute

Value	Description
`false`	Arrays greater than 2 GB in total size are not enabled. This is the default.
`true`	Arrays greater than 2 GB in total size are enabled on 64-bit platforms.

Child elements

None.

Parent elements

Element	Description
`configuration`	The root element in every configuration file used by the common language runtime and .NET Framework applications.
`runtime`	Contains information about runtime initialization options.

Remarks

Using this element in your application configuration file enables arrays that are larger than 2 GB in size, but does not change other limits on object size or array size:

The maximum number of elements in an array is UInt32.MaxValue.
The maximum size in any single dimension is 2,147,483,591 (0x7FFFFFC7) for byte arrays and arrays of single-byte structures, and 2,146,435,071 (0X7FEFFFFF) for arrays containing other types.
The maximum size for strings and other non-array objects is unchanged.

Caution

Before enabling this feature, ensure that your application does not include unsafe code that assumes that all arrays are smaller than 2 GB in size. For example, unsafe code that uses arrays as buffers might be susceptible to buffer overruns if it's written on the assumption that arrays will not exceed 2 GB.

Example

The following app.config file snippet shows how to enable this feature for a .NET Framework application.

<configuration>  
  <runtime>  
    <gcAllowVeryLargeObjects enabled="true" />  
  </runtime>  
</configuration>

Supported in

.NET Framework 4.5 and later versions

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