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AppSettingsExpressionBuilder.GetAppSetting Method (String, Type, String)

Returns a value from the <appSettings> section of the Web.config file with the value converted to a target type.

Namespace:  System.Web.Compilation
Assembly:  System.Web (in System.Web.dll)

public static Object GetAppSetting(
	string key,
	Type targetType,
	string propertyName
)

Parameters

key
Type: System.String

The key for a value to be retrieved from the configuration file.

targetType
Type: System.Type

The type of the object that contains the property entry.

propertyName
Type: System.String

The name of the property to which the expression is bound.

Return Value

Type: System.Object
The Object associated with the key in the <appSettings> section of the Web.config file.

ExceptionCondition
InvalidOperationException

The key is not found in Web.config.

- or -

The return value could not be converted.

This method retrieves the appropriate value from the key/value pairs in the <appSettings> section of the Web.config file. The value is retrieved by getting the AppSettings property with the key as the index. The resulting string value is converted to a new type based on the targetType and propertyName parameters.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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