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Package.CreatePart Method (Uri, String, CompressionOption)

Creates a new part with a given URI, content type, and compression option.

Namespace:  System.IO.Packaging
Assembly:  WindowsBase (in WindowsBase.dll)

public PackagePart CreatePart(
	Uri partUri,
	string contentType,
	CompressionOption compressionOption
You cannot use methods in XAML.


Type: System.Uri

The URI of the new part.

Type: System.String

The content type of the data stream.

Type: System.IO.Packaging.CompressionOption

The compression option for the data stream, NotCompressed or Normal compression.

Return Value

Type: System.IO.Packaging.PackagePart
The new created part.


partUri or contentType is null.


partUri is not a valid PackagePart uniform resource identifier (URI).


A part with the specified partUri is already present in the package.


The compressionOption value is not valid.


The package is not open (Dispose or Close has been called).


The package is read-only (a new part cannot be added).

For the default ZipPackage derived class, the CreatePart method only supports two compressionOption values, NotCompressed or Normal compression. Other CompressionOption values of Maximum, Fast, or SuperFast use Normal compression.

CreatePart creates an empty Stream for the new part. The PackagePart.GetStream method can be used to obtain a reference to the stream instance associated with the part.

For additional information, see the Open Packaging Conventions (OPC) specification available for download at

Notes to Inheritors:

CreatePart internally calls the derived class's CreatePartCore method to actually create the part based on the physical format implemented in the derived class.

The following example shows how to create a new PackagePart and then store data into the part. For the complete sample, see Writing a Package Sample.

// Add the Document part to the Package
PackagePart packagePartDocument =

// Copy the data to the Document Part 
using (FileStream fileStream = new FileStream(
       documentPath, FileMode.Open, FileAccess.Read))
    CopyStream(fileStream, packagePartDocument.GetStream());
}// end:using(fileStream) - Close and dispose fileStream.

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