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SYSLIB0047: XmlSecureResolver is obsolete

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The System.Xml.XmlSecureResolver type is obsolete, starting in .NET 7. Using it in code generates warning SYSLIB0047 at compile time.

Workaround

Consider using the static property XmlResolver.ThrowingResolver instead. This property provides an XmlResolver instance that forbids resolution of external XML resources.

using System.Xml;

XmlResolver resolver = XmlResolver.ThrowingResolver;

Suppress a warning

If you must use the obsolete APIs, you can suppress the warning in code or in your project file.

To suppress only a single violation, add preprocessor directives to your source file to disable and then re-enable the warning.

// Disable the warning.
#pragma warning disable SYSLIB0047

// Code that uses obsolete API.
// ...

// Re-enable the warning.
#pragma warning restore SYSLIB0047

To suppress all the SYSLIB0047 warnings in your project, add a <NoWarn> property to your project file.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
   ...
   <NoWarn>$(NoWarn);SYSLIB0047</NoWarn>
  </PropertyGroup>
</Project>

For more information, see Suppress warnings.

See also