BitmapDataExtensionsBeginGetColors Method

Begins to get the colors used in the specified bitmapData asynchronously. A limit can be defined in maxColors.


Namespace: KGySoft.Drawing.Imaging
Assembly: KGySoft.Drawing.Core (in KGySoft.Drawing.Core.dll) Version: 8.1.0
public static IAsyncResult BeginGetColors(
	this IReadableBitmapData bitmapData,
	int maxColors = 0,
	bool forceScanningContent = false,
	AsyncConfig? asyncConfig = null


bitmapData  IReadableBitmapData
The IReadableBitmapData, whose colors have to be returned. If it is indexed and the forceScanningContent parameter is , then its palette entries are returned and maxColors is ignored.
maxColors  Int32  (Optional)
A limit of the returned colors. If forceScanningContent parameter is , then this parameter is ignored for indexed bitmaps. Use 0 for no limit. This parameter is optional.
Default value: 0.
forceScanningContent  Boolean  (Optional)
to force scanning the actual image content even if the specified bitmapData is indexed and has a palette. This parameter is optional.
Default value: .
asyncConfig  AsyncConfig  (Optional)
The configuration of the asynchronous operation such as cancellation, reporting progress, etc. When Progress is set in this parameter, then this library always passes a DrawingOperation instance to the generic methods of the IAsyncProgress interface. This parameter is optional.
Default value: .

Return Value

An IAsyncResult that represents the asynchronous operation, which could still be pending.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IReadableBitmapData. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).


In .NET Framework 4.0 and above you can use also the GetColorsAsync method.

To get the result or the exception that occurred during the operation you have to call the EndGetColors method.

This method is not a blocking call, though the operation is not parallelized and the MaxDegreeOfParallelism property of the asyncConfig parameter is ignored.


See the Remarks section of the GetColors method for more details.

See Also