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FrameworkContentElement.FindResource Method

Searches for a resource with the specified key, and will throw an exception if the requested resource is not found.

Namespace:  System.Windows
Assembly:  PresentationFramework (in PresentationFramework.dll)

public Object FindResource(
	Object resourceKey
)
You cannot use methods in XAML.

Parameters

resourceKey
Type: System.Object

Key identifier of the resource to be found.

Return Value

Type: System.Object
The found resource, or null if no matching resource was found (but will also throw an exception if null).

ExceptionCondition
ResourceReferenceKeyNotFoundException

The requested resource key was not found.

ArgumentNullException

resourceKey is null.

Important noteImportant Note:

If you call this method for a key that cannot be found, an exception is thrown. If you do not want to handle exceptions for this case, you should instead call TryFindResource. TryFindResource returns null when no resource is found, and does not throw an exception.

If the resource is not found on the calling element, the parent tree is searched using the logical tree, in the same way that the tree would be searched if a resource were requested by key at run-time.

Typically you would immediately cast the return value to the type of the property that you were attempting to set with the returned resource value.

The following example finds a resource as defined in markup and applies it to a certain property of an element in response to a routed event.

void SetBGByResource(object sender, RoutedEventArgs e)
{
    Block b = sender as Block;
    b.Background = (Brush)this.FindResource("RainbowBrush");
}

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

.NET Framework

Supported in: 3.5, 3.0

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