ResXResourceWriter Class

Writes resources in an XML resource (.resx) file or an output stream.

Namespace: System.Resources
Assembly: System.Windows.Forms (in

public class ResXResourceWriter : IResourceWriter, IDisposable
public class ResXResourceWriter implements IResourceWriter, IDisposable
public class ResXResourceWriter implements IResourceWriter, IDisposable
Not applicable.

The ResXResourceWriter writes resources in XML format. To write a binary resource file, use ResourceWriter.

Resources are specified as name/value pairs using the AddResource method. Resource names are case-sensitive when used for lookups; but to more easily support authoring tools and help eliminate bugs, ResXResourceWriter does not allow a.resx file to have names that vary only by case.

To create a.resx file, create a ResXResourceWriter with a unique file name, call AddResource at least once, call Generate to write the resources file to disk, and then call Close to close the file. Calling Close will implicitly Generate the file if required.

The resources are not necessarily written in the same order they were added.

For more information on the format of a.resx file, see Resources in .Resx File Format.


This class contains a link demand and an inheritance demand at the class level that applies to all members. A SecurityException is thrown when either the immediate caller or the derived class does not have full-trust permission. For details about security demands, see Link Demands and Inheritance Demands.

  • SecurityAction.LinkDemand  for full trust for the immediate caller. This member cannot be used by partially trusted code.
  • SecurityAction.InheritanceDemand  for full trust for inheritors. This member cannot be inherited by partially trusted code.


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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