net9.0-android34.0 
namespace 
{
    public static class AsyncExtensions : ?
    {
        public static Task<?> GetRequestStreamAsync(this ? source);
    }
}
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Reference this API
.NET
6.07.08.09.0
.NET Framework
4.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net9.0
Platforms This API is only available when you target a specific platform:
Android
21.022.023.024.025.026.027.028.029.030.031.032.033.034.0
Information specific to net9.0-android34.0
Assembly

Microsoft.Threading.Tasks.Extensions , Version=1.0.12.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs a package reference to Microsoft.Bcl.Async.

Package Microsoft.Bcl.Async (1.0.168) portable-net45+win8+wpa81
Platform Restrictions

This API is only supported on the following platforms:

  • Android
  • Built-in API
  • Package-provided API